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b7b851c1-bd67-42b5-a3eb-a8d56f4993c5 | [5]J.Wei, “Intensity dependent effects in RHIC,” AIPConfer-
ence Proceedings , vol. 496, pp. 197–212, 12 1999.
[6]K. Johnsen, “Effects Of Non-Linearities On The Phase Tran-
sition,”CERN Symp. High Energy Accel. and Pion Phys. ,
pp. 106–111, 1956.
[7]V.Ptitsyn,N.Abreu,M.Brennan,M.Blaskiewicz,W.Fischer,
C.Montag,R.Lee,an... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA056.pdf | 3 |
a2736f68-c33e-4053-bf44-1c006a70a4fb | AnnualReviewofNuclearandParticleScience ,vol.52,no.1,
pp. 425–469, 2002.
[11]C. Liu et al., “Reconfiguration of RHIC Straight
Sections for the EIC”, in Proc. IPAC’22 , Bangkok,
Thailand, Jun. 2022, pp. 1916–1919. doi:1/zero.alt4.18429/
JACoW-IPAC2/zero.alt422-WEPOPT/zero.alt434
[12]S.Peggs,A.Drees,H.LovelaceIII,andG.Ro... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA056.pdf | 3 |
47d1d3ec-c10e-47fa-b64c-d5ba7e7703f8 | INSTALLATION OF A NEW LOW ENER GY LINE (LEBTO3) AT CNAO*
C. Priano†, S. Alpegiani, M. Bozza, E. Bressi, L. Fa lbo, S. Gioia, L. Lanzavecchia, M. Manzini,
P. Meliga, R. Monferrato, A. Parravicini , M. Pezzetta, M. Pullia, S. Savazzi,
G. Venchi, C. Viviani, F. Zanoli, Fondazione CNAO, Pavia, Italy
Abstract
CNAO... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 0 |
95642d83-b770-4ef1-9fc6-f900de2aa907 | called LEBTO3, is presented.
INTRODUCTION
CNAO [1] uses two Supernanogan ECR sources. The
systems for medical applications installed in a hospital
environment, in addition to requiring ions with sufficient current intensity to minimize patient treatment times, also
require high reliability, stability and reproduci... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 0 |
17ac8163-e05f-4928-9d84-80a63cc252ac | experience on this type of sources.
Figure 1: Installation of the new LEBT line.
These modifications have made it possible to
significantly improve the characteristics of stability,
reliability and expected average life of the source, also optimizing the ionization efficiency, the flexibility in easily
varying t... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 0 |
cf2540e5-aa42-4623-8195-0c20c9ec6bc1 | of already accelerated proton s and carbon ions, i.e. about
2 Gy/L in 1-2 minutes. As a first approximation, the intensity of each species can be obtained from that of
carbon by scaling with Z
-2, where Z is the atomic number.
Assuming the same carbon injection/acceleration/extracti on efficiencies, the input
curre... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 0 |
5764940d-8240-4966-bd6d-746d581ead83 | Species selection can be achie ved if the ion species can
be sufficiently separated to place a pair of slits in a position
that allows one type of ion to pass through and stops
unwanted particles on the slits itself. This capability is expressed by the ratio "dispersion/beam size" which is
generally called resoluti... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 0 |
783230f3-1a14-4164-a658-df1137bf1fe4 | species most present in the spectrum and Δx is the distance
between the peaks. Figure 2 shows a spectrum for carbon
___________________________________________
* Work supported by the Call Hub Research and Innovation POR-FESR
2014-2020 by Regione Lombardia (Project ID 1161908) and by the 5th
National Committee o... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 0 |
431c4672-5270-476c-b6f9-97d53286eae3 | obtained starting from a mix of CO 2 and He measured
during the commissioning of AISHa in INFN-LNS [2].
The minimum resolution o ccurs when the distance Δx is
at least equal to the width W, and therefore R min is given
by:
𝑅 =ఘమ
ఘభିఘమ
Figure 2: Carbon spectrum during commissioning at
INFN-LNS.
OPTICA... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 1 |
a8cc4054-b447-4c52-9608-0103bdc5ceba | already installed the AISHa source.
Table 2 shows the optical parameters obtained for
Carbon, Helium and Oxygen beams:
Table 2: Twiss Parameter at Source Exit
Parameter C He O
𝛽௫ ሺ𝑚ሻ 4.54 10.46 9.75
𝛼௫ 20.52 40 41
𝛽௬ሺ𝑚ሻ 1.43 4.28 3.34
𝛼௫ 6.63 16.55 14.67
5𝜀ோெௌሺ𝜋 𝑚𝑚 𝑚𝑟𝑎𝑑ሻ 380 325 220
The sett... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 1 |
c6de6de7-6488-4345-a8d2-bd4b3a1ab2e6 | Figure 3: Trend of the Beta functions and of the dispersion
along the LEBTO3 line.
Figure 4: Residual orbit distortion (blue) after correcting
over a set of 500 random alignment and field errors (red).
LEBTO3 INTEGRATION
The new line has been designed to fit into the current
layout, minimizing the impact on th... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 1 |
fe1c7aad-7e13-4988-8919-d87f8fbc6fa3 | of curvature of 1150mm (see Fig. 6, Fig. 7 and Table 3).
Table 3: Dipole Characteristics
O2 O3
Deflection 90° 33°
Bending radius 400mm 1150mm
Entrance edge angle 26.6° 10° Exit edge angle 26.6° 26.6°
Integrated field quality ≤±3 10
-3 ≤±6 10-3 | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 1 |
c329659b-55ab-4b1e-9a42-4e76920874f6 | Figure 6: The new two input bending dipole.
Figure 7: Calculated traject ories for the beams coming
from O3 and O2 sources.
LEBTO3 COMMISSIONING
The commissioning of the new source has currently been
carried out only for helium and up to the spectrometer
output.
In the next few months, the helium will be tr... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 2 |
b389bbe1-6ab8-45a0-8c2d-1abc2871aff5 | 2+).
In Fig. 9 the spectrum measurement is reported.
An emittance measurement was than performed using
the slits and wire scanners present in the diagnostic tank
downstream of the dipole (Fig. 8). Figure 10 and Table 4 show the emittances and twiss pa-
rameters measured.
Figure 9: Measured helium spectrum.
... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 2 |
8125f05f-ac10-4304-b69b-57d60aef358b | other ionic species.
ACKNOWLEDGEMENTS
INSpIRIT project has been funded in the Framework of
the Call Hub Research and Innovation POR-FESR 2014- 2020 by Regione Lombardia (Project ID 1161908).
REFERENCES
[1] S. Rossi, “The Nationa l Centre for Oncological
Hadrontherapy (CNAO): stat us and perspectives”, Physica
Me... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA059.pdf | 2 |
af89b22e-d6a6-45d3-bc05-2bd3b72a0422 | DESIGN AND COMMISSIONING OF THE RF -KO EXTRACTION AT
CNAO
P. Meliga†, E. Bressi , G. Debernardi, L. Falbo, C. Priano, CNAO Foundation, Pavia, Italy
Abstract
CNAO is one the six hadrontherapy centres all around
the world that produce both proton and carbon
ions beams. It is based on a synchrotron in which th... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 0 |
4925a5cb-7901-46e0-b0e3-df9775ce96cb | acteristics of the proton and carbon beams will be also
presented.
INTRODUCTION
The National Centre for Oncological Hadrontherapy
(CNA O) in Pavia is one of the six centres worldwide that
provides clinical treatments for oncological pathologies
with both proton and carbon ions beams. The beam parti-
cles are ac... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 0 |
c533e7ec-dc96-4940-9094-08dc31820e1b | The resonant tune chosen for the extraction at CNAO is
𝑄𝑄
𝑥𝑥= 5/3 and currently the beams are extracted by means
of a betatron core that accelerates the particles toward the unstable region. Right before the extraction begins, the phase of the RF cavity voltage is changed by 180° to
flatten the beam momentum sp... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 0 |
f09b421f-f95b-4516-bc32-720df1711205 | the beam is required.
RF-KO EXTRACTION TECHNIQUE
In the last years CNAO has worked on the implementa-
tion and optimization of RF- KO (Radio -Frequency Knock
Out) as an alternative to betatron core extraction. In RF -
KO extraction, the beam is conducted into the unstable region by increasing the amplitude of the... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 0 |
3168abb9-b0bf-4c3b-b227-2986158d0fff | At first order in 𝑑𝑑𝑑𝑑
𝑑𝑑, the RF frequency can be written as:
𝑓𝑓𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅≈ 𝑓𝑓0�(𝑛𝑛±𝑞𝑞0)+𝑑𝑑𝑑𝑑
𝑑𝑑�𝜉𝜉+𝜂𝜂(𝑛𝑛±𝑞𝑞0)�� 𝑛𝑛 ∈ ℕ
where 𝑓𝑓0 and 𝑞𝑞0 are respectively the revolution frequency
and the fractional part of the horizontal tune of the
synchronous particle, 𝜉𝜉 is the chr... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 0 |
5c851683-347f-4217-97ef-739718e57373 | also an amplitude modulation (AM) is necessary. Consid-
ering the impossibility of guaranteeing perfect repeatabil-ity between one spill and another, for example due to the
current ripples of the power supplies or the variability of the number of accelerated particles, a purely analytical
approach to the shape of t... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 0 |
0d697c47-af81-423b-9768-80473be59ae4 | where 𝑓𝑓𝑟𝑟𝑟𝑟𝑟𝑟 is the revolution frequency of the beam, 𝜏𝜏𝑟𝑟𝑥𝑥𝑒𝑒𝑟𝑟
is the desired duration of the extraction and 𝑎𝑎1 and 𝑎𝑎2 are
two parameters that allow you to adjust the maximum
value and the curvature of the voltage ramp.
RF-KO IMPLEMENTATION
Hardware Description
The horizontal pert... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 1 |
744a7f1f-83bd-4578-887a-c8f7ae149e40 | (LLRF) board identical to the one used for beam accelera-
tion, a 500 W RF amplifier, a voltage divider for the volt-
age feedback loop and a RF balun . With a kicker length of
37 cm, a gap of 137.24 mm between the electrodes , the
maximum deflection for the highest carbon ion energy
(400 MeV/u) is 0.8 μ rad [3]. ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 1 |
252d721a-6b02-4c36-b496-7ad878bb8ef5 | signal generation and the amount of charge accelerated in
the ring measured by a DC Current Transformer (DCT),
the LLRF computes the reference voltage ramp given in
Eq. (1) and sends the signal to the RF amplifier imposing
for the extraction time:
𝜏𝜏𝑟𝑟𝑥𝑥𝑒𝑒𝑟𝑟=𝐷𝐷𝐷𝐷𝐷𝐷⋅𝐸𝐸𝑓𝑓𝑓𝑓𝑟𝑟𝑥𝑥𝑒𝑒𝑟𝑟
𝐼... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 1 |
c4892fde-a491-4753-8411-7fe8d8053b8b | of 100 µs, second feedback has been implemented to
minimize the variations on the derivative of the counts
measured by the DDs. This feedback controls the current
of the Air Core Quadrupole, a special iron -free magnet
that can provide small but very fast corrections to the machine tune.
As can be seen in Fig. ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 1 |
ca28161a-93db-4927-8ff2-894f6c81f934 | Quadrupole power supply is w orking properly.
• The PIS is the system that manages the High Energy
Beam Transfer line chopper, a group of four fast
magnets able to stop beam on a dump in 200 µs.
Since the DDs registers no counts when the chopper
stops the beam , the two feedback would re act in-
creasing the ki... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 1 |
4c5b226d-9275-408f-85b9-a0c7e807f9d0 | an extraction of both proton and carbon ions beam of at
least the same quality of that obtained with betatron core.
The main aspects taken into account were:
• The beam extraction efficiency.
• The spill intensity uniformity at temporal scales
from 100 µs up to 10 ms.
• The beam average intensity .
• The acc... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 1 |
83028de8-8050-4e7b-92de-94c33ffb1dba | much as possible the beam momentum spread. In
fact, u nlike the betatron core extraction, the beam
extracted with RF -KO has the same momentum
spread of the beam circu lating in the accelerator.
• A reduced tune spread is also preferable; therefore,
the chromaticity must be brought toward zero. Best results wer... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 1 |
6e49eae8-cf2a-4cde-914d-81a231b79721 | • The machine horizontal tune has a great impact : a
beam far from the resonance is stable but difficult to
extract, on the other hand if the beam is too close to
the r esonance there may be los ses when the reso-
nance sextupole is turned on. Thus , the synchrotron
quadrupole’s setpoints were set to avoid los ses... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 2 |
b72fc24a-7b58-4306-9313-3d3f8085d0f3 | can be modulated with respect to a nominal value via a
reduction factor (called degrader ). The clinical intensities
values are reported in Table 1 and Table 2, while the
measured ones are reported in Fig. 2 . Even tho ugh the
intensities obtained with RF -KO are a bit lower than the
reference ones, the improv... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 2 |
2578fb0a-5662-472c-b760-8cf39ed12144 | 10% 8×106 part/s 4×106 part/s
Figure 2: Measured beam intensities for the different
degrader factors .
Finally , regarding the control of the ripple spill, one of
the main quantities taken into account was the ratio be-
tween the maximum counts and the average counts regis-tered by the DDs at sample rates of... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 2 |
2c6d1e0d-2865-43ff-8461-b3a479c4cec2 | apy (CNAO): status and perspectives”, in Physica Med ., vol.
31, pp. 333-351, 2015.
doi:10.1016/j.ejmp.2015.03.001
[2] T. Furukawa et al., “Global spill control in RF -knockout
slow-extraction ”, Nucl. Instrum. Methods Phys. Res., Sect.
A, vol. 522, pp.196-204, 2004. doi:
/10.1016/j.nima.2003.11.395
[3] S.... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA060.pdf | 2 |
c96ef64b-b8b3-4ccd-ae10-2b491e63d296 | TECHNOLOGICAL FEATUR ES AND STATUS OF THE NEW HEAVY IONS
SYNCHROTRON SIS100 A T FAIR
P. J. Spiller, P. Bartolome, J. Blaurock, L. Bozyk, M. Draisbach, T. Eisel, U. Gambardella (*),
A. Illuk (**), M. Janke, F. Kaether, M. Kauschke, G. J. Ketter, S. Klammes, S. Klammes, P. Kowina,
H. Klingbeil, H. Kollmus, D. Lens,... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 0 |
b17accda-76e7-4130-ae5a-e47fa3e517e6 | for heavy ion beams in SIS100 is the dynamic vacuum and
corresponding beam loss by projectile ionization [2]. Ioni-
zation loss and ion induced desorption drive the residual
gas pressure into an instability, generating an intensity bar-
rier at much lower intensity levels than any space charge
limit. Technologies f... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 0 |
8982c31a-da07-4518-81bb-6ea9a5701973 | bunches. Meanwhile, a large amount of the SIS100 com-
ponents have been delivered and preparatio ns for installa-
tion are intensified .
STATUS OF CIVIL CONS TRUCTION
Figure 1: View on the FAIR construction site with the re-
filled SIS100 tunnel pit in front.
The SIS100 tunnel, which is part of the constru... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 0 |
e5375e78-bacb-4f64-b103-46deaf434652 | structure and th e cryogenic distribution system is being conducted. The start of i nstallation of the first a ccelerator
section is planned for January 202 4.
STATUS OF THE ACCELE RATOR
The integration process of the 110 cryogenic dipole cham-
bers into the superconducting dipole modules has been
completed (... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 0 |
81251fbe-449a-4686-bfdf-af075d8fcf11 | To date no further units have been completed and shipped
to GSI and measures have been initiated to compensate for
these shortfalls. The number of units delivered so f ar,
served for completing the integration of 13 quadrupole
modules at Bilfing er Noell, Germany. Due to the shortfall
of units, the integration pro... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 0 |
f3cf2736-92d4-4331-890b-6559429e3825 | by European industry is possible. However, the local
know-how for manufacturing the Nuklotron -type magnets,
especially the corrector magnets using a cable with insu-
lated s.c. strands, has to be further developed. As first step, | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 0 |
14657d88-5165-4226-addd-d13cff1b6b15 | the production capacities, including tooling for the produc-
tion of most units types and few prototype units will be
contracted. Depending on the result of negot iations and
evaluations with JINR, further series units will be made in
industry. In addition, cold testing capacities for the units,
including magnetic... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 1 |
9f73fb62-3a9e-4901-8c6d-0c1d38643312 | cility THOR in Salerno for the potentially extended sub-
project duration . In order to prepare the production of the
series of quadrupole units at an alternative manufacturer,
the re ‐procurement of yoke steel and s.c . wire, required for
s.c. cables have already been launched by GSI. At the
THOR test facility at... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 1 |
d21f8028-da16-43b7-bee1-e879705fbf21 | minimized forces on the cold mass has been carefully in-
vestigated.
Figure 3: Dipole -dipole interconnection region with a cryo -
adsorption pump in the middle, process lines on top and
bottom and the main bus bar systems.
The First -of-Series FOS quadrupole module, send to Sa-
lerno, has been integrated into t... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 1 |
1d752bd2-d948-46ec-bedc-35740be97e7a | chambers and all other parts to be integrated into the quad-
rupole modules, such as cryo‐ion catchers, cryogenic BPM system etc. are available and s tored until the integration
process is being continued . This is also the fact for the large
components of the quadrupole modules itself, such as cry-
ostat vessels,... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 1 |
e8d936c7-0a29-443d-b38d-899520501631 | Especially the I ndian shareholder and provider hav e com-
pleted manufacturing of the 166 steerer magnet power con-
verter. As last major components of the SIS100 beam line
components, t he procurement process for the ex traction
septum magnets 1 and 2 could be successfully completed
and the contract for product... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 1 |
a78a73be-02f2-4a26-aca2-99ac9e25c05b | FOS kicker a sufficiently s hort rise time of the system
could be demonstrated . The impact of disturbing reflec-
tions in the discharge current, after the main pulse, has been
minimized by using transmiss ion cables with slightly dif-
ferent length. In this way, superposition of the refle ction
can be avoided ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 1 |
9239436b-78f5-42d6-812c-b361f7d4ffa4 | moment of the cycle. At company RI , Germany a first
Pulse Forming Network (PFN) system used for the energy
storage has been assembled and promising measurements
have been conducted. All Rf acceleration and bunch com-
pression cavities have been delivered. Acceptance t ests
with the MA loaded bunch compression cavi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 1 |
2ac26e0d-63f7-4d1b-9163-f13a825b35a8 | company Kriosystem, Poland. The series production is
well advanced and will be completed mid of 2023. To ver-
ify the quality and functionality of special techn ical details,
such as the s.c. cable feed ‐through in the vacuum barrier, a
number of bypass lines were cold tested at the GSI STF
facility. Another invita... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 1 |
b27bb63e-05ee-470a-8434-57e7c3eec827 | the current lead boxes has been repeated and is presently
published. A concept and strategy to involve more potential
bidders has been developed with the aim to enable a suc-
cessful next procurement process also for the upcoming
feed-boxes.
Figure 4: Cryogenic bypass lines containing the LHe pro-
cess li... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 2 |
f2f07c3a-989e-42da-aa4e-bb90c2bc3690 | final tunnel installation. The mechanical integration is used
to develop working teams conducting the assembly process
of the overall cryo magnetic- and local cryogenic system of
SIS100. The string test assembly is almost completed and
the first cool down will be conducted until May 23.
Figure 5: Sketch of the ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 2 |
e8b40d54-2f77-4974-8fac-02ee09e6ddf4 | low charge state and at low velocities and intensities (e.g.
ions in traps. It can also be applied to ions with a very high
charge state at relativis tic velocities and high intensities.
This can be achieved by exploiting the huge Doppler shift
(`Lorentz boost´) of the cooling transition in the ions (as
measured ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 2 |
77d8a3a5-4630-4673-997c-cd9e38ca05ab | different charge states can be laser -cooled. The laser sys-
tems can be operated at either 257 nm (UV light) or 514
nm (green light). The magnetic r igidity can be varied be-
tween 9 and 100 Tm. This powerful combination enables
laser cooling of bunched ion beams ranging from very light
ions, such as carbon to medi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 2 |
c10fd9f7-b840-4569-9c45-589f28b5dd4d | power of each laser system will be of the order of a few
Watts. This should be sufficient to achieve fast and power-
ful cooling, i.e. a reduction of the longitudinal momentum
spread of the ion beam by several orders of magnitude
within a few seconds [7]. The laser systems will operate
from the laser lab, which wi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 2 |
d9a9bccd-a71f-49e8-8f47-2ccbf328166d | the accelerator, two aluminium mirrors will be used to
guide the light along the ion beam direction. The laser light
will travel a dist ance of about 45 m inside the SIS100 vac-
uum. However, to prevent the ion beam from hitting these
mirrors, a horizontal closed orbit distortion, which tilts the
beam axis by only ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 2 |
073517da-e9e6-4134-b480-d66b7f93e713 | REFERENCES
[1] P. Spiller et al., “The FAIR heavy ion s ynchrotron SIS100 ”,
JINST, vol. 15, paper T12013, 2020.
[2] L. H. J. Bozyk et al., “Ionization loss and dynamic vacuum in
heavy ion synchrotrons ”, in Proc. IPAC ’17, Copenhagen ,
Denmark, May 2017, paper TUPVA056, pp. 2201-2204.
[3] P. Spiller et al., “T... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA062.pdf | 3 |
e2a211fa-2d04-4974-b0c4-74cfced9af0e | LIGHT SOURCE DEVELOPMENTS AT UVSOR BL1U *
M.Katoh1†, H. Ota, J. Yamazaki , K. Hayashi, Y . Okano, E. Salehi, Y . Taira,
UVSOR , Okazaki , Japan
A. Mano, M. Fujimoto, Y . Takashima, M . Hosaka2, Nagoya U., Nagoya, Japan
F.Sakamoto , Akita -NCT , Akita , Japan
T.Kaneyasu , SAGA -LS, Tosu , Japan
H.Zen, Kyoto U., Uji ,... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 0 |
51a097ee-ad08-416f-bc7d-abb6f7473e04 | undulator of optical klystron type. We moved the beam in-
jection point which was in a 4 m straight section to the next 1.6 m straight section [12].
Figure 1: Conceptual Design of BL1U
Figure 2: Latest view of BL1U
BEAMLINE BL1U AT UVSOR- III
BL1U was designed and constructed as a dedicated
beamline for develo... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 0 |
be1c3719-e539-47c3-88df-2c8b6b96cd27 | to a very flexible beamline which can be equipped with
various apparatus such as a Seya -Namioka monochroma-
tor, streak camera, gamma- ray detectors and so on, depend-
ing on the experiments. One remarkable feature of this beamline is that we can extract the direct photon beam in the ultraviolet range from undulators... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 0 |
6b8efaa1-fc85-4796-865d-2f3eb146f137 | BL1U is a dedicated beamline for developments and appli-
cations of novel light source technologies . The beamline is
equipped with two variable -polarization undulato rs with a
phase-shifter magnet and with a femto -second laser system
which is synchronized with the RF acceleration. We have
been studying osc... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 0 |
6f15195b-48c6-45a0-be41-be8176e08898 | eration energy is 750 MeV and the circumference is 53.3
m. It has four straight sections of 4 m long and four of 1.6
m long. Six undulators are operatio nal. It has been provid-
ing high brightness VUV radiatio n to users in Japan and
also those from foreign countries. On the oth er hand, it has
been providing a... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 0 |
4e835b35-8077-413f-9543-b1fc21df1690 | In 2000s , we installed a femtosecond laser system at the
free electron laser beamline and started laser slicing
[5,6,7], coherent harmonic generation (CHG) [8,9,10] and
laser Compton scattering ( LCS) [ 11].
The FEL had been parasitizing to a photoelectron sp ec-
troscopy beamline. The users used undulator radia... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 0 |
d9e5f763-1bf3-48c9-b6b0-9165fd7cafc1 | which is generated by the laser slicing, a new infrared
beamline BL1B was also constructed at the bending mag-net next to BL1U [13]. The latest view of BL1U is shown
in Figure 2.
Undulator System
The undulator system at BL1U consists of two identical
APPLE -II undulator of about 1 m long and a phase -shifter
(b... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 1 |
df62d00c-86da-4b31-98f2-def9d256ca15 | shifter magnet is a three -pole electric wiggle r and the main -
pole coil and side -pole ones are excited separately.
Table 1: Undulator Parameters
Parameters
Number of Periods 10 + 10
Period Length 88 mm
Pole Gap 24-200 mm
Max. Deflection Parameters 7.36 (Hor.)
4.93 (Ver.)
4.06 (Cir.)
Max. R 56 of Phase... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 1 |
e6647ad8-d5aa-4456-a558-470ccaf9175e | mechanical vibrations , which is a source of the timing jitter
between the FEL pulses and the electron bunches . A feed-
back system was developed to maintain the synchroniza-
tion between the intracavity laser pulse and the electron bunches [14]. The mirror in the upstream can be controlled
in pitch and yaw and t... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 1 |
1d14914a-a7a0-4a68-a68b-ec69010c9c4c | and HIDRA ). The oscillator is synchronized with the RF
acceleration of the storage ring by a feedback system (CO-
HERENT SYNCHROLOCK) with a typical timing jitter
around 250 fsec [5]. This system can provide several mJ femtosecond pulses with 1 kHz repetition rate and 50 mJ
with 10 Hz rate. All laser system is i... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 1 |
53f633eb-b179-4a2a-b167-d256e84ab4ec | end of the optical cavity. Moreover, we have two additional 90-degree injection ports from the top and the side to the
beam , which enables producing ultrashort gamma -ra
y
pulses [11] .
RECENT RESULTS FROM BL1U
Recently, researchers from universities and t echnical
colleges have restarted studies on oscillator -ty... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 1 |
1ee7939b-582c-4ad1-8257-37ee886a1be7 | In these several years, we have been focusing on spatio-
temporal structure s of undulator radiation and its applica-
tions. Electromagnetic wave emitted from relativistic elec-
trons has characteristic waveform which reflects the elec-tron motion. When the electron beam is diffraction limited, such wave properties be... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 1 |
2a7c0388-e6e7-433c-b7fd-a4c79088f207 | ture. Interestingly, the time separation between the double
pulses can be controlled by the phase -shifter magnet. We
have also demonstrated this based on interferometric
method as shown in Figure 3 [19]. We collaborated with
atomic physicists and have demonstrated some possib le ap-
plications of such ultrafast... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 1 |
c9f7216f-bcf7-48c2-9c84-de90776b7d7a | Figure 3: Interferogram of tandem undulator radiation ob-
served by a Mach -Zehnder interferometer, which reflects
the double -pulse structure with the pulse separation con-
trolled by the phase shifter magnet [ 19].
Figure 4: Double slit diffraction pattern of helical undula-
tor radiation, the fundamental (left) ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 2 |
7c5805e6-29ef-4dd5-b694-fb2126a11a78 | has been making academic achievements continuously . The compactness of UVSOR made it possible to construct
such a beamline with much smaller cost than large fa cili-
ties. The low electron ener gy is suitable to develop new
light source technologies based on the laser -electron inter-
action and on the diffraction... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 2 |
2c469a34-0412-452a-989c-9ba20e2a2ff9 | energy synchrotron like UVSOR can play important roles in developing novel technologies and in training young re-
searchers.
ACKNOWLEDGEMENTS
The authors thank UVSOR Synchrotron facility staffs
for their cooperation. The construction of BL1U was sup-
ported by the Quantum Beam Technology Program of
MEXT/JST .
R... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 2 |
d941d0b8-68d4-4cb1-81f5-129f4cbf062c | facility”, Nucl . Instr . Meth . A vol. 483, no. 1– 2, pp. 146–
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2f4ae101-5a9e-4c6b-a0b6-39e586559633 | [10] T. Tanikawa et al. , “Observation of Saturation Effect on
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UVSOR -II”, Appl. Phys. Express vol. 3, no. 12, p. 122702,
Dec. 2010 . doi: 10.1143/APEX.3.122702
[11] Y. Ta i r a et al. , “Photon -induced positron annihilation life-
time spectroscopy using ult... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 3 |
040a66fe-8e58-4bad-9342-18facc8890af | doi: 10.1088/1742- 6596/359/1/012009
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[15] H. Zen et al ., “Revival of UVSOR -FEL and Gamma Ray
Ge... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 3 |
54baaf28-2242-41b8-97f0-83b884c6d3d2 | AIP Advances 9, 035101 (2019) .
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[19] T. Kaneyasu et al ., “Double -pulsed wave packets i... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 3 |
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[23] M. Katoh et al., “H... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA063.pdf | 3 |
91e505f0-0e9a-4d48-af08-48de491d27a5 | BAYESIAN OPTIMIZATION OF THE DYNAMIC APERTURE IN
UVSOR- IV DESIGN STUDY
E. Salehi†, M. Katoh1, UVSOR, Institute for Molecular Science, Okazaki, Japan
1also at HSRC, Hiroshima University, Higashi-Hiroshima, Japan
Abstract
A lattice of a storage ring for the future plan of UVSOR
synchrotron facility, UVSO... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 0 |
2fa6d653-3068-41c2-9787-0fb499a2cf32 | ties, we examined improving the dynamic aperture by
optimizing the sextupole arrangement based on the
Bayesian method. We have demonstrated optimiz ing the
harmonic sexupole strength of fo ur families with 100
iterations of running particle tracking simulation that is
much faster than traditional method s suc... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 0 |
25d07a5f-9d1e-4bf4-b3e3-c21e6cf4aa51 | light beam in the vacuum ultraviolet and x -ray range s
from scientific community , several synchrotron light
sources, which have exceedingly small emittance less
than 1nm, are under consideration, construction, or in
operation [6-8]. In such a situation, we have started con-
sidering a futur e plan for UVSOR wi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 0 |
d136a025-e80f-47b0-b231-c9199e83be59 | few nm, we have designed a totally new storage ring,
UVSOR -IV which has higher electron energy, 1 GeV, a
larger circumference , 82.5m , and small emittance around
4 nm [10]. The lattice consists of twelve double bend
cells.
In a low emittance storage ring, sextupole magnets used
in the lattice for chromati... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 0 |
84465f04-afdd-498b-97a9-cf60efbc2d72 | timized parameters , such as so -called harmonic sextu-
poles or higher order nonlinear elements like octupoles. In
fact, finding the optimal parameters of additional magnets
to achieve large DA by surveying the magnet parameters
is a costly evaluation in the design study of the lattice . In
order to reduce ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 0 |
db53ce9d-afa7-49d9-8a0d-b8d0c90d7834 | for optimization of expensive evaluations in accelerator
physics [17-19].
Bayesian optimization is one of machine- learning -
based optimization methods focused on solving the prob-
lems where an objective function is expensive to probe or
most ly takes a long time to evaluate. Bayesian optimiza-
tion builds ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 0 |
c33d2a77-6b72-4a45-9cd2-b2053c16be51 | mization of DA of UVSOR -IV by using Bayesian optimi-
zation method.
LATTICE DESIGN
The lattice of UVSOR -IV has been designed based on a
compact double bend achromat cell (DBA) , which con-
sists of two bending magnets and four focusing magnets ,
all of which are combined function magnets . Two sextu-
pole ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 0 |
ca86084f-7a27-40df-a4a3-55445ba9955d | A tune survey was performed to find the linear optics
with a low emittance and appropriate optical functions.
ELEGANT [ 21] was used for the calculations. We
found an optic with the emittance of around 4 nm in
the achromatic condition, which becomes lower in the
non-achromatic condition. Figure 1 shows the opti... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 1 |
08f33272-6d04-4977-b62e-4d48cf93f3df | Harmonic num. 16 26
RF voltage 120 kV 100 kV
Coupling ratio 0.01 0.01
Energy spread 0.000526 0.000576
Emittance 16.9 nm 4.3 nm
Betatron tunes (3.75, 3.20) (8.63, 3 .19)
DYNAMIC APERTURE
In a low emittance lattice, the dynamic aperture (DA),
which corresponds to the maximum betatron amplitude
wher... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 1 |
c10568e4-858a-4cd2-843f-09bf712ea58c | nonlinear effects is a key issue to make the DA sufficient-
ly large for injection and storage . DA can be calculate d by
single -particle tracking simulations , which tracks a parti-
cle with a set of initial conditions in six -dimensional
phase space through the accelerator lattice for a given
number of turns. ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 1 |
a5202551-4195-4c57-94b2-1aecd9d37bce | Figure 2: Dynamic aperture of the optic. The particle
tracking has been run for 1024 turns passing through the
storage ring.
In order to increase DA , it is effective to introduce ex-
tra sextupole families at the free dispersion sections,
whose strengths become free parameters for controlling
the nonlinear effe... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 1 |
72603445-3913-417b-997b-246a20989a31 | OTIMIZATION ALGORITHM
In order to optimize a black- box function there are a
large of variety of local optimization algorithms in use
[22-24]. Due to the simplicity of l ocal optimization meth-
ods, they have very strong performance for cheap func-
tions which are noiseless and does not require significant
tim... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 1 |
aa2f6420-d99f-43ca-9364-eec5985e53ae | Bayesian optimization , which is a framework to opti-
mize a costly black- box function which take a long time
to evaluate. It consists of two elements; a surrogate model
which is a mathematical model to approximate the real
objective function and an acquisition function which
describes the strategy to determ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 1 |
bd9feeaf-780d-4cce-a2a1-8476f5b33a7e | repeated iteratively to find the optimum parameters th at
optimize the objective funct ion.
DYNAMIC APERTURE OTIMIZATION
In the presen ce of strong chromatic sextupole magnets
in the 4- nm lattice of UVSOR_IV, the nonlinear beam
dynamics result in reduction of the DA as shown in Fig.
2. In order to i mprove DA... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 2 |
2871b079-e6cf-4262-854f-898e887c13d5 | ic sextupole strengths is completely surveying the sextu-
pole strengths . If we examine at least 10 values for each
harmonic sextupole strength, the number of running the
simulation code will be around 10000, which is very
expensive in CPU time. To sa ve the CPU time, decreasing
the number of running simulation... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 2 |
f3967e27-cde3-46de-9a1b-8341ce653f09 | iterations as shown in Fig. 3 . In this calculation , the DA
evaluated using particle -tracking simulation, ELEGANT ,
is objective function for each trial solution . For the acqui-
sition function which is defined as the target for selecting
next trial solution , we chose the lower confidence bound
(LCB) [26] wi... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 2 |
318faf90-3566-441e-b58f-10d63069130f | proach the optimal harmonic sextupole strengths after 50
iterations (it takes around 3 hours ). While the surveying
method to find the optimal harmonic sextupole strengths
needs at least 10000 number of running simulati on code
which requires approximately 7 processor days to com-
plete.
Figure 4 shows DA for t... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 2 |
ace6b75f-1d7f-4709-ab20-c4349b243ca9 | storage ring.
CONCLUSION
In this paper we studied the optimization of sextupole
parameters in order to improve DA of UVSOR -IV , new
lattice for future plan of UVSOR. Due to the time -
consuming of DA evaluation by particle tracking simula-
tion, an effective optimization algorithm is needed. Here
Bayesian ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 2 |
1e3391ce-bc42-4e81-be0e-923c7593afb1 | more free parameters to control the nonlinear effects on
beam dynamics such as more harmonic sextupole families
and including their placements as free parameter s. Alt-
hough the number of iterations increases by increasing the
dimensions of objective function, it should be much faster
than traditional methods in ... | d:\Daily_ihep\Weekly Progress Report\20260425\41_IPAC'23\MOPA - Monday Poster Session_ MOPA\MOPA064.pdf | 2 |
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