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b2413dec-3049-45bf-b756-f5128a169b23 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP5101
2490 MC5.D04: Beam Coupling Impedance Theory, Simulations, Measurements, Code DevelopmentWEP5101 WEP: Poster session
Content from this work may be used under the terms of the CC BY 4.0 licence (© 2026). Any distribution of this work must maint... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5101.pdf | 0 |
9f2a919a-833b-41ab-962f-ea5753f1d3c0 | ADVANCED IMPEDANCE MODELING
METHODOLOGY
To capture these effects, advanced modeling approaches
are required, combining high-resolution electromagnetic
simulations, detailed geometrical representation, realistic
material properties and coupling with thermal and mechani-
caleffects. Suchmodelsenableadeeperunderstandingof... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5101.pdf | 1 |
217c9038-3ae7-477a-99ad-d97a69b66f27 | tact between the fingers and the transition tube significantly
altered the beam coupling impedance. This led to plastic
deformationofthespring,resultinginthelossordegrada-
tion of electrical contact. The configuration evolved during
operation as the spring progressively lost its ability to main-
tain proper contact. Co... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5101.pdf | 1 |
b4bcef66-3b96-4757-a9b2-7dcb29d622e0 | the run is illustrated in Fig. 4, which depicts a feedback
loop where beam-induced heating modifies the geometry,
thereby altering the impedance and further affecting power
deposition. As an example of this mechanism, Fig. 5shows
the temperature evolutionunder identical beam parameters,
clearlyindicatinganongoingchange... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5101.pdf | 1 |
2911829b-3e8c-43ea-b00e-c0c075cb37bb | gies [4,5]. Since 2022, beam observations in the LHC have
revealedasignificantincreaseinvacuumactivityassociated
with the TCLD, with pressure spikes observed when chang-
ingbeamconfigurations,particularlyfillingpatterns. This
indicated a sensitivity to the beam spectral content and a
behaviour compatible with sparking ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5101.pdf | 1 |
a6400f48-792a-467e-9702-b631000625ca | per bunch, suggesting a possible contribution from beam-
inducedheating. Theseobservationstriggeredadedicated
impedancestudy,supportedbypreviousX-rayinspections
oftheinstalledTCLD,whichrevealedaspecificRF-finger
configuration, as shown in Fig. 6. This configuration was
reproducedindetailedCSTelectromagneticsimulations[... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5101.pdf | 1 |
c85da426-4935-48e0-86e4-52df345bdc0c | approximately 22mmto10mm. The measurements con-
firmed the mitigationeffect, while alsoenabling benchmark-
ingoftheimpedancemodelandvisuallyverifyingsimilar
RF-finger configurations in the spare TCLD devices.17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 I... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5101.pdf | 1 |
b89e1e25-ac13-4eae-aafa-63736ebb479d | Figure4: Illustrationofthefeedbackmechanismdrivingimpedanceevolution: beam-inducedheatingmodifiesthegeometry,
which alters the beam coupling impedance and, in turn, changes the power deposition, potentially leading to further heating
and deformation.
Figure5: Measuredpressure(black,leftaxis)andtemper-
ature (red, right... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5101.pdf | 2 |
061fc798-edef-4130-bb0c-7c9d4f9923a1 | Althoughtheexactin-machineconfigurationofthefingers
remainsuncertain,thecombinedimpedanceapproachbased
on simulations and measurements provides a robust tool
to guide and support operational decisions. In fact, these
results motivated the reduction of the TCLD gap for the
2026 run as an effective mitigation strategy to... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5101.pdf | 2 |
d528a563-bcee-483c-abe8-4ebae7ee82bb | failure mechanisms and guide mitigation strategies.
These capabilities are particularly relevant for the HL-
LHC, where tighter margins and higher beam intensities
require accurate and predictive impedance models.17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-25... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5101.pdf | 2 |
554a5ecb-e72a-4b4a-b521-315ecdd03514 | REFERENCES
[1]C.Antuono etal.,“Impactofhigh-intensitylhcbeamoperation
on warm vacuum modules”, Phys. Rev. Accel. Beams , vol. 28,
p. 041001, 2025.
doi:1/zero.alt4.11/zero.alt43/PhysRevAccelBeams.28./zero.alt441/zero.alt4/zero.alt41
[2]C.Zannini etal.,“Estimationofpowerlevelsonrffingersin
the vmsio.6l2.b”, CERN, Present... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5101.pdf | 3 |
27958ae2-10ea-4325-891e-c8f06f5925fc | indico . cern . ch / event / 16/zero.alt473/zero.alt46 / contributions /
6772182/attachments/3167927/563/zero.alt4581/TCLD_5_11_
LMC_CA.pdf
[5]C. Antuono, “TCLD 5.11 Status and Outlook”, 2024, https:
//indico.cern.ch/event/16/zero.alt49688/ ,
[6]C. Zannini, “ZS beam-induced sparking”, Presentation at
the 173rd HSC Meet... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5101.pdf | 3 |
0141ecbf-ced0-4e4a-bf37-9928abef2252 | CHALLENGES IN BEAM COUPLING IMPEDANCE FOR FCC-ee
C. Zannini∗, C. Antuono, E. de la Fuente Garcia, D. Gibellieri1, E. Macchia, I. Mases Sole,
G. Rumolo, L. Sito, CERN, Geneva, Switzerland
A. Ghribi1, GANIL, Caen, France
M. Zobov, INFN - LNF, Frascati, Rome, Italy
M. Migliorati, University of Rome La Sapienza and INFN, R... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 0 |
c49291e5-d883-45a2-bb12-a1794c171daa | pipe dimensions and very short bunch lengths, which drives
wakefieldsimulationsintoanextremelydemandingcomputa-
tionalregime,whereveryfinespatialresolutionisnecessary
to accurately capture the beam–environment interaction. In
addition, the beam-pipe cut-off lies within the frequency
rangeexcitedbytheFCC-eebeam. Asacons... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 0 |
dfc4a078-ec7d-4d9b-92c3-fecb52ac17f1 | eeoperatesinaregimethatuniquelycombinesultra-short
bunch lengths with relatively large beam-pipe apertures.
This configuration pushes a significant fraction of the beam-
induced electromagnetic spectrum beyond the cut-off fre-
quency of the vacuum chamber. Consequently, a non-
negligibleportionoftheexcitedfieldsisnolon... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 0 |
57221d92-0d41-4544-aff1-8a0477849206 | environment.
This propagation fundamentally alters the physical pic-
tureofimpedancemodeling. Inconventionalaccelerators,
impedance is typically treated as a local property, attributed
∗carlo.zannini@cern.ch
Figure 1: Comparison between beam spectrum and beam
pipecut-offfrequencyforFCC-eeandLHC.FCC-eeexhibits
a substan... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 0 |
e4952707-4296-4b11-9f9f-ac78baacc451 | a distributed electromagnetic system, where interference,
reflections, and modalconversioneffects playa significant
role.
Such a regime brings new challenges for both simulation
andinterpretation. Numericalresultsbecomeintrinsically
sensitive to boundary conditions, domain truncation, and
the treatment of absorbing bou... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 0 |
cb4a75d1-fec3-47ba-8a7a-475c03422e45 | energytransportedoverlongdistancescancoupleintobeam
diagnostics, which may therefore respond not only to the
localpassageofthebeambutalsotofieldsgeneratedelse-
where in the ring. This non-local sensitivity complicates
the interpretation of measurements and can potentially lead
to malfunctions. Altogether, FCC-ee operat... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 0 |
f12424f4-a5a2-4bea-b36f-ccc6478ac13f | whereimpedancemustbeunderstoodasaglobalproperty
arising from the interplay between localized sources and
long-rangefieldpropagation. Developingareliablemodel
thereforerequiresnotonlyaccuratedescriptionsofthebeam
coupling impedance of individual components, but also a
careful treatment of wave propagation above cut-off,... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 1 |
6cb7ef69-f347-4a6a-aff6-f224ad19148f | the choice of boundary conditions. In contrast, the presence
of propagating modes introduces a strong dependence on
the boundary conditions. Figure 2highlights the fundamen-
tally different physical nature of modes below and above
the beam-pipe cut-off. For frequencies below cut-off, the
fields excited in the beam pipe... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 1 |
dd406ddd-f7a9-4351-a61c-87145cda5c2d | agating modes, allowing electromagnetic energy to travel
alongit[1]. Inthisregime,thechoiceofboundarycondition
becomescritical. Electric(perfectlyconducting)boundaries
enforce total reflection of outgoing waves, artificially trans-
forming the structure into a closed resonator and producing
narrow, high-Q resonances. I... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 1 |
21f0d1cb-dea9-4ba9-ba59-8716af44e0fb | cross-talk with neighboring elements should be considered
for a more accurate impedance evaluation.
Propagating Modes and Non-local Effects
Abovecut-off,partoftheexcitedfieldpropagatesalong
the beam pipe and can interact with distant components.
This leads to non-local impedance contributions, cross-talk
betweenacceler... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 1 |
5e3fab9d-8958-46ec-b2ae-10495df5b86d | Several strategies can therefore be considered:
•Artificial localization: enforcing reflectiveboundaries
at the entrance and exit of each device. This approach
suppressespropagationbutleadstoasignificantover-
estimation of impedance and is therefore not suitable.
•Use of absorbers or couplers: introducing dedicated
ele... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 1 |
6c005b91-3990-499a-9b6f-b16c392fb0b7 | device from the power carried away by propagating modes.
Thelattercanbeconsideredasdistributedalongthemachine
and must be accounted for in global power-loss estimates.
PowerDecomposition Toclarifytheinterpretationof
the simulation results, it is useful to distinguish between
total and propagating power. The total beam-... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 1 |
3dbc12b5-ac05-4308-8395-e97a3f47db8b | theuncertaintyoftheevaluationmethodology. Abovecut-
off,however,asignificantfractionofthepowerisfoundto
propagate. Asavalidationofthemethod,simulationswith
electric boundary conditions are used as a reference (see17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-25... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 1 |
0ab31d80-6ef2-476f-bf50-eaefee318b57 | Figure 3: Illustrative example of an FCC-ee collimator with
a taper angle of 15∘. Top: real part of the impedance to-
getherwiththefractionofpropagatingpower. Bottom: total
beam-induced power and locally deposited power, whose
difference defines the propagating contribution.
Fig.4). In this case, all power is artificia... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 2 |
2344abfd-efa1-4c58-9a40-9e4229b34864 | Example of Application
Themethodhasbeenappliedtotherepresentativecaseof
FCC-ee collimators. Figure 5shows that design parameters,
such as the taper angle, influence not only the total beam-
induced power but also its partition. For larger taper angles,a significant discrepancy between total and device power is
observed... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 2 |
b977d911-bac5-4cb7-8381-8942d610f8b8 | power that propagates away from the device, thereby reduc-
ingnon-localeffects. Sucheffectsareexpectedtocompli-
cateboththemodelingofbeamcouplingimpedanceandthe
overall operability of the machine.
CONCLUSION
FCC-ee operates in a regime where a significant fraction
of the beam-induced fields lies above the beam-pipe cut... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 2 |
de2d5d30-3469-48a3-b30c-1b1ae4b2ef99 | detailscanstronglyinfluencenotonlythetotalimpedance
but also the fraction of power that propagates along the ma-
chine. Thisintroducesanadditionaldesigncriterion: beyond
minimizing beam-induced power and related instabilities,
accelerator components should also be optimized to limit
the propagating power.
Acomprehensiv... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 2 |
af5a8bae-59cb-4f7b-9588-1ebc2eac6bd8 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP5102
2496 MC5.D04: Beam Coupling Impedance Theory, Simulations, Measurements, Code DevelopmentWEP5102 WEP: Poster session
Content from this work may be used under the terms of the CC BY 4.0 licence (© 2026). Any distribution of this work must maint... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 2 |
c7783150-869b-4c69-8868-9109b365da09 | [2]C.Zannini,G.Iadarola,andG.Rumolo,“PowerLossCalcula-
tion in Separated and Common Beam Chambers of the LHC”,
inProc. IPAC’14 , Dresden, Germany, Jun. 2014, pp. 1711–
1713. doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt414-TUPRI/zero.alt461
[3]E:delaFuente,L.Sito,F.Giordano,G.Rumolo,B.Salvant,
andC.Zannini,“APythonPackage... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 3 |
e2596014-dcfd-4102-92b5-1f473db7bbc7 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP5102
MC5.D04: Beam Coupling Impedance Theory, Simulations, Measurements, Code Development 2497WEP: Poster session WEP5102
Content from this work may be used under the terms of the CC BY 4.0 licence (© 2026). Any distribution of this work must maint... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5102.pdf | 3 |
ddd3ed0b-7959-4b9f-8a7c-1a41554938f7 | COLLECTIVE EFFECTS AND IMPEDANCE UPDATE FOR THE
DIAMOND-II STORAGE RING
R. Fielder∗, N. Blaskovic Kraljevic, D. Rabusov,
Diamond Light Source, Oxfordshire, United Kingdom
Abstract
Impedance and collective effects are significant concerns
for the design of modern accelerators. During development
of the Diamond-II storag... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 0 |
89bf2037-8be9-4e90-93a3-ff57a10ae310 | synchrotron light source. Collective effects are a major con-
siderationformodernaccelerators,giventhecombination
of lower beam emittance with generally smaller diameter
beampipes. Ensuringinstabilitieswillnotinterferewithop-
erationsbyminimising beamimpedance during the design
stage is necessary. Diamond-II will have ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 0 |
0db1186e-b304-46d0-917d-b6a4e7a2d949 | updatetotheDiamond-IIstoragering(SR)impedance,high-
lighting significant changes to both geometric and resistive
wall impedance since this was last reported in 2024 [ 2].
RESISTIVE WALL IMPEDANCE
Resistivewall(RW)impedance forDiamond-IIiscalcu-
latedfromanimpedancedatabase[ 3]containingtheaper-
tures(horizontalandverti... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 0 |
81e0f0d8-8e33-4309-858f-90047eaa88f1 | engineering design and manufacture, all narrow-gap vessels
forout-of-vacuumIDswillnowuseaNEG-coatedcopper
chamber with the same 20 × 8mm full gap elliptical pro-
∗richard.fielder@diamond.ac.ukfile in all locations. While the increased conductivity of
coppercomparedtoaluminiumshouldreduceimpedance,
reducingtheverticalap... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 0 |
e0b96be5-f25f-45f2-b955-cd25cde04d48 | titanium-coatedceramicvesselstotheinjectionkickers. Ad-
ditional ceramic vessels have been included in the database
for a pair of diagnostics pinger magnets, however, a final
decisiononwhethertheseadditionalvesselsarerequiredhas
yettobemade. Thisresultsinasignificantincreaseinthe
totallengthofceramicvesselsandacorrespo... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 0 |
8a4c9cd3-9224-4c21-bfca-61a0ac935fee | Total – 560.56
Figure1showsthelong-rangeresistivewallimpedance
of the updated impedance model.
GEOMETRIC IMPEDANCE
Geometric impedance is calculated using the wakefield
solverin CSTStudio[ 7]. Short rangewakesare calculated
using a𝜎=0.5mmdrive bunch length and 300mmwake
length, which have been determined to give conve... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 0 |
b3ae1947-d7aa-4f76-8402-6a5db0a9d163 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP5104
2498 MC5.D04: Beam Coupling Impedance Theory, Simulations, Measurements, Code DevelopmentWEP5104 WEP: Poster session
Content from this work may be used under the terms of the CC BY 4.0 licence (© 2026). Any distribution of this work must maint... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 0 |
51f7b528-3571-4805-ba29-8e7524a4c5e6 | Figure 1: Resistive wall impedance for the Diamond-II SR.
Horizontal (top), vertical (middle) and longitudinal (bot-
tom).
significant non-metallic materials such as ceramics. The
totalshortrangegeometricwakeisshowninFig. 2. Long
range geometric impedance is calculated using a 𝜎=8mm
drivebunchlengthwherepossible,altho... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 1 |
266413ee-bb13-4e90-a6e4-eddb5d6f0176 | II both use the same design, shown in Fig. 3, rotated by
90degrees relativetoeachother,withthebladesatanom-
inal7mmgapforthehorizontaland 3mmgapforthever-
tical. The design has been updated after discussions with
themanufacturer,resultinginshorter,steeperfixedtapers.
Long range wakefields were previously not included f... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 1 |
2f977079-41e6-4672-95e0-6db35d8137bc | MainRFhaseightnormal-conductingcavitiessplitacross
four identical straights (K05, K09, K10, K15), while a su-
perconducting higher harmonic cavity (HHC) is in K17,
close to existing cryogenic systems for the current super-
conducting RF cavities. The RF cavities themselves are
included in tracking simulations using mod... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 1 |
0c8aae37-df50-45f5-afb8-e6a66dd1355e | engineering model for the main RF straights is shown in
Fig.4.
Figure 4: Engineering model forthe main RF straights.
Injection
Injection systems for Diamond-II are split across two
straights. TheI01longstraightcontainsfourpulsedkicker17th International Particle Accelerator Conference, Deauville, France JACoW Publishing... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 1 |
e89d7f69-63cf-4cd0-9ba9-d70e14c79423 | magnets, an electromagnetic thin septum magnet, and a
combined permanent magnet/electromagnetic main septum
magnet. Designworkisstillinprogressforthemainseptum,
so this is not yet included in the database. The design of the
K01 mid-straight containing the stripline kickers for kick-
and-cancelinjection[ 8]islargelysett... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 2 |
53ac5210-e6ae-43a2-b0ee-77c1a64ebd06 | that it is possible to simulate a relatively simple model of
an ID vessel in a 2.4mlong straight with 160mmradius.
However,workremainstotesthowvariationsindimensions
or addition of more detail affect the results, to determine
if this generic model would be valid for inclusion in the
impedance database.
Beam Dumps
Thebe... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 2 |
8d8bd990-448b-470f-a082-cd14314ab8dc | RESULTS
Coupled-bunchinstabilitygrowthratesincludingallre-
sistive and geometric impedance are shown in Fig. 6. In
thehorizontal,thelargestgrowthratesareduetotheinjec-
tion striplines, which have the most impact around modes
870-910. The large peaks in the vertical around modes 300and 600 come from the vertical collima... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 2 |
338dc87d-fbf7-4ea4-9347-b45f95466329 | CONCLUSION
The design of Diamond-II has progressed significantly,
with most vessels in the arcs finalised and many compo-
nentsalreadycontractedformanufacture. Theimpedance
modeland corresponding particledynamics and instability
thresholds have been updated to match. Focus is now on
theremainingcomponents,especiallythe... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 2 |
6f2b415e-f699-4e9f-bc62-84e170bd82cf | modelforDiamond-II”,in Proc.IPAC’21 ,Campinas,Brazil,
May2021, pp. 455–458.
doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt421-MOPAB127
[4]ImpedanceWake2D. https://twiki.cern.ch/twiki/
bin/view/ABPComputing/ImpedanceWake2D , accessed
27 Apr.2026.
[5]M. Borland, “elegant: A flexible SDDS-compliant code for
accelerator simula... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 2 |
e83c73b2-3b31-49aa-a8fb-36486be5f554 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP5104
2500 MC5.D04: Beam Coupling Impedance Theory, Simulations, Measurements, Code DevelopmentWEP5104 WEP: Poster session
Content from this work may be used under the terms of the CC BY 4.0 licence (© 2026). Any distribution of this work must maint... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 2 |
df5bed1c-8756-4fb3-95e9-32f32022ef59 | IPAC’26, Deauville, France, May 2026, paper WEP6138, this
conference.
[7]CST Studio Suite. https://www.3ds.com/products/
simulia/cst-studio-suite , accessed 27 Apr. 2026.
[8]A.Lueangaramwong etal.,“Kick-and-cancelinjectionscheme
for the Diamond-II storage ring”, Phys. Rev. Accel. Beams ,vol. 28, no. 6, p. 060701, 2025.... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 3 |
a9b0c651-a54d-4caf-ad65-9cfd073ef272 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP5104
MC5.D04: Beam Coupling Impedance Theory, Simulations, Measurements, Code Development 2501WEP: Poster session WEP5104
Content from this work may be used under the terms of the CC BY 4.0 licence (© 2026). Any distribution of this work must maint... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5104.pdf | 3 |
ba040863-b1b8-47df-b57c-7feb6d7472d2 | MICROWAVE INSTABILITY MODELLING FOR SOLEIL II
V. Gubaidulin∗, A. Gamelin
Synchrotron SOLEIL, Saint-Aubin, France
Abstract
Thereare twomain sourcesof high-frequency longitudi-
nalimpedance: coherentsynchrotronradiation(CSR)and
high-frequencyNEG-coatedresistivewallimpedance. They
can drive microbunching instability, whic... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 0 |
7334d332-57e0-426e-b616-5ea009394286 | 100 pm rad (<60 pm rad with full betatron coupling) is
presentlyintheconstructionphase. Twooperationmodesare
planned: 416buncheswith 1.2mAperbunch; 32bunches
with6.25mAper bunch. In our previous paper [3], we
addressed microwave instability (MWI) arising from broad-
bandlongitudinalimpedanceupto 100GHz inthepresence
of... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 0 |
ace5576d-db0e-4328-873d-ce2c8f2cb9d2 | and geometric contribution (computed with CST Studio ,
GdfidLandECHO3D). Table 1 shows the dipole magnet pa-
rametersrelevanttoCSRimpedanceandwakepotentialcom-
putation. SOLEILIIdesignincludes 178reversebendswith
Table 1: SOLEIL II Dipole Magnet Parameters Relevant to
CSR
Dipole type Number𝐿 dipole𝑅bendingℎhalfgap
sh... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 0 |
b0ee6e6f-ceaa-4ed0-910a-5f2431e4e66a | tribution from CSR and NEG-coated resistive wall (RW)
impedance), real part (a), imaginary part (b).
length, reversebendscontributeonlya negligibleamountto
CSR impedance and, thus, are ignored.
Figure 1 displays the extension of the resistive wall com-
ponenttohigherfrequencies( <5 THz)andthecontribution
of CSR to the ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 0 |
8d403412-e345-467d-aa22-7af3646bc99e | First estimation of CSR-driven MWI can be given an-
alytically based on the dipole magnet parameters [7,13],
assuming
𝐼th=𝐼𝐴𝛼𝑐𝛾𝜎2
𝛿𝜎1/3
𝑠
𝑅1/3
bending
0.5+0.12𝜎 𝑠√︄
𝑅bending
ℎ3
halfgap!
,
where𝐼𝐴≈17 kAistheAlfvencurrent, 𝛼𝑐isthemomentum
compaction, 𝛾isthe Lorentzgamma, 𝜎𝑠isthe rmsbunch
length,𝜎𝛿... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 0 |
e5c99975-65cc-4fd3-ba8d-5e8abe004952 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP5105
2502 MC5.D05: Coherent and Incoherent Instabilities Theory, Simulations, Code DevelopmentWEP5105 WEP: Poster session
Content from this work may be used under the terms of the CC BY 4.0 licence (© 2026). Any distribution of this work must maint... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 0 |
db11fee1-b764-4a3a-8c28-4bd0e920a771 | □15□10□5 0 5 10
Normalised time, µ=3γ3
2Rs(arb. units)0.00.20.40.60.81.0Wakefunctionπr2ϵ0
γ4LW(µ) a) W(s)(Murphy et al)
W(s)(Saldin et al)
□5.0□2.5 0.0 2.5 5.0
Longitudinal position, z/σz□15□10□5051015Wakepotential, Wp(V/pC/m)
Bunch HEAD Bunch TAIL(b)
Free space CSR (analytical)
Free space CSR (data of [20])
Free space... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 1 |
84692004-4e30-42ad-8a50-3917002f9329 | a) Free space component of CSR wakefunction; b) free
spacecomponentofCSRwakepotential;c)parallelplates
shieldingcomponentofCSRwakefunction;d)parallelplates
shielding component of CSR wakepotential.
important in SOLEIL II than in SOLEIL for operational
parameters.
CSR Wakepotential Implementation
CSR contribution is usu... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 1 |
8d18a0ff-c779-4791-8557-701b432e796b | Figure 2 shows mbtrack2 CSR wakepotentials, and their
benchmarkswiththeresults of[19]: freespaceCSRwake-
function(a),freespaceCSRwakepotentialforaGaussian
bunch (b), parallel plates CSR wakefunction (c), parallel
plates CSR wakepotential for a Gaussian bunch (d). Free
spaceandparallelplatesshieldingcomponentsareshown
s... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 1 |
2d4ababc-be15-4369-8f44-5ea3ec2f7815 | in [14]. The perfect agreement between our results, the data
of [19], and the analytical formula in Fig. 2 validates the
implementation of CSR wakepotential inmbtrack2.
0 2 4 6 8 10
Bunch current, I(mA)0.1000.1250.1500.1750.2000.2250.2500.2750.300Energy spread, σδ(%)
Nbin=256,Nmp=1.0e+06
Nbin=256,Nmp=5.0e+06
Nbin=256,N... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 1 |
0f85a547-9980-4cbf-9d6b-757b1bc27ed7 | SOLEIL (low momentum compaction mode), used in the
previous section for benchmarking the implementation.
Figure3showsaconvergencestudyonmacroparticleand
bin numbers for simulating CSR for SOLEIL II parameters.
In this convergence study, only the CSR wake is included
as a source of beam instability or bunch lengthening.... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 1 |
07299987-b95b-4516-85d0-81d439f786b3 | MWI. Without the narrow peak in THzfrequency region,
the simulation parameters are determined by the require-17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP5105
MC5.D05: Coherent and Incoherent Instabilities ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 1 |
b0155e7d-0873-4c51-80b1-4b016f8b4503 | mentstoresolveCSRimpedance. Thisresultsinarelatively
modest requirement on the number of macroparticles and
bins. Inthatcase,theinstability thresholdsaredetermined
bylowerfrequencyimpedance. Fortheresistive-wall-driven
MWI,theresultsareidenticaltotheoneswithimpedance
<100 GHz [3]. TheTHzpeak does not affect the thresho... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 2 |
0c7ee6bf-120d-4c40-9941-8f5077918067 | nation of all relevant effects in the simulation.
Basedonaconvergencestudy, 10000000 macroparticles
aretrackedfor 25000turnsinallsimulations;thebunches
are sliced longitudinally into 512bins for the wakefield and
IBSinteractions. Thebinningofthebunchforwakecompu-
tations is done dynamically in mbtrack2 , so the simulat... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 2 |
317010c9-8916-428a-b3ae-c10a19f40b77 | ofeachcurveshowstheminimalandmaximalenergyspread
during the bursting behaviour of MWI. Similar to [3], we
consider the MWI threshold to be determined by the start
ofenergyspreadoscillations,asthemeanvalueofenergy
spreadwillsteadilygrowwithcurrentduetoIBS.TheMWI
threshold is 𝐼th≈2 mAwithout taking into account IBS,
whi... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 2 |
61f7b316-0527-4514-9ab4-e6b37e759b88 | after the instability threshold and to slightly increase the
instability threshold itself. With CSR included, the equi-
librium energy spread does not change for the 416-bunch
operationmodebutwillslightlyincreasefor 32-bunchmode.
Figure6showsthermsbunchlength,includingtheeffects
ofCSR,IBSandimpedance. Inthecaseofbunchl... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 2 |
6a76ce91-9b32-40c4-8b7e-64f29a70fc6b | considered [10].
CONCLUSION
CSRwakepotentialwasimplementedin mbtrack2 and
benchmarked with previously published results and an ana-
lytical formula. The effect of CSRon microbunching insta-
bility thresholdwas investigatedforthe case ofSOLEIL II
storage ring. We find that in SOLEIL II the MWI thresh-
oldisdominatedbyth... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 2 |
214b6e22-4f6e-43e4-8c44-afe1f51d92ee | Lille) for providing the original data (used in the bench-
mark) of [19] and for sharing the implementation details
withus. Part ofthis work was performedusing theCCRT
HPCresource(TOPAZEsupercomputer)hostedatBruyéres-
le-Châtel, France.17th International Particle Accelerator Conference, Deauville, France JACoW Publishi... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 2 |
0e48acb7-b6df-4ae9-a191-6ffac33dd6a5 | REFERENCES
[1]Synchrotron SOLEIL, “Conceptual Design Report - Syn-
chrotron SOLEIL Upgrade”, Synchrotron SOLEIL, White
paper, Jul. 2021. https://www.synchrotron- soleil.
fr/fr/file/13803/download?token=OUzsp46P
[2]A.NadjiandL.Nadolski,“UpgradeProjectoftheSOLEIL
Accelerator Complex”,Synchrotron Radiat. News, vol. 36,
no... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 3 |
515bf5fc-0610-4a63-94e1-bed44ea260df | [5]K.L.F.Bane,Y.Cai,andG.Stupakov,“Thresholdstudies
of the microwave instability in electron storage rings”,Phys.
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[6]G. Stupakov and D. Zhou, “Analytical theory of coherent
synchrotron radiation wakefield of short bunches shi... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 3 |
a453c5e9-0810-4fc6-a496-5171ff307595 | no. 5, p. 054401, May 2023.
doi:10.1103/PhysRevAccelBeams.26.054401
[9]W. Li, T. He, and Z. Bai, “Terahertz scale microbunching
instability driven by high resistivity nonevaporable getter
coating resistive-wall impedance”,Phys. Rev. Accel. Beams,
vol. 27, no. 3, p. 034401, Mar. 2024.
doi:10.1103/PhysRevAccelBeams.27.03... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 3 |
962e34f9-9294-41bd-9856-225beca3a125 | [12]A. Gamelin, V. Gubaidulin, R. Nagaoka, and S. Thakur, “Im-
proved resistive wall effective radius taking into account
yokoya factors”, presented at IPAC’26, Deauville, France,
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storage rings”,Phys. Rev. ST Accel.... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 3 |
d995f1ba-e5ff-4973-b2f3-d8af383bd500 | no. 2–3, pp. 373–394, Oct. 1997.
doi:10.1016/S0168-9002(97)00822-X
[16]M. Borland, “Simple method for particle tracking with co-
herent synchrotron radiation”,Phys. Rev. Spec. Top. Accel.
Beams, vol. 4, no. 7, p. 070701, Jul. 2001.
doi:10.1103/PhysRevSTAB.4.070701
[17]J. Qiang, C. Mitchell, and R. D. Ryne, “A fast high... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 3 |
960e19fc-cd0c-4d98-9f50-fe1ed9ee247a | space structure and terahertz coherent synchrotron radiation
radio-frequencyspectra”,Phys. Rev. Spec. Top. Accel. Beams,
vol. 17, no. 1, Jan. 2014.
doi:10.1103/physrevstab.17.010701
[20]Eéonore. Roussel, “Spatio-temporal dynamics of relativis-
tic electron bunches during the microbunching instability:
studyoftheSynchro... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 3 |
20673b72-bfd5-4aea-be1d-cc08f7f1c5e5 | inas, Brazil, May 2021.
doi:10.18429/JACoW-IPAC2021-MOPAB070
[23]A. Gamelin, W. Foosang, N. Yamamoto, V. Gubaidulin, and
R. Nagaoka,mbtrack2, Synchrotron SOLEIL, Dec. 2024.
doi:10.5281/zenodo.1087103917th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 267... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5105.pdf | 3 |
89df9b64-5f8c-49a8-a652-ed9daa566ea3 | BEAM-BASED INSTABILITY AND BUNCH-BY-BUNCH FEEDBACK
CHARACTERIZATION AT SOLEIL
V. Gubaidulin∗,1, M. El Ajjouri1, A. Gamelin1, R. Sreedharan1, S. Thakur1,2
1Synchrotron SOLEIL, Saint-Aubin, France
2Deutsches Elektronen Synchrotron DESY, Hamburg, Germany
Abstract
In the context of the ongoing SOLEIL II upgrade, a mea-
sur... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 0 |
60cef65d-03b5-4ff3-b10c-279fec1e82be | impedancemodelandpastmeasurements. Ourresultspro-
vide guidance in designing the bunch-by-bunch feedback
system for SOLEIL II.
INTRODUCTION
SynchrotronSOLEIL[1]isusingatransversefeedback
system based on that of the Spring-8 [2–4] for the storage
ring. Itwaspreviouslydescribed[5,6],notablyinrelation
to characterisation ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 0 |
65723d80-c01d-4fad-b5d1-b1f706a322df | ties [16–18]. The impedance model of the SOLEIL storage
ring was recently updated [19] using an impedance mod-
ellingapproachidenticaltotheoneforSOLEILII[13,20,
21].
Single- and multibunch operation modes of SOLEIL are
described in Table 1.
Table 1: SOLEIL Operation Modes
Mode𝑁 bunches𝐼bunch(mA)𝑄 bunch(nC)
Uniform 4... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 0 |
673c7644-5fd1-4b71-83fd-ec730fed9cfa | andmultibunchregimes( 500mA)withopeninsertionde-
vice gaps (IDs). Inall measurements, for feedback, a 5-tap
FIRfilterisapplied toasignalwithaphasecorresponding
to purely resistive feedback. All multibunch measurements
were made with every rf bucket filled.
Threshold MeasurementsBeam or bunch current
threshold is one of... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 0 |
3706cbc4-cde0-4b0d-9c5c-53e0ad9f8b46 | triggered by an injection event, we inject with bunch-by-
bunchfeedbackturnedonandswitchitoffaftertheinjection.
Thismeasurementisusefulprimarilyfortheoperationteam
toknowthecurrentlimitswithoutbunch-by-bunchfeedback.
Thresholdscanalsobecomparedwithanalyticalformulae
or with tracking simulations.
Growth-damp measurement... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 0 |
c7a3e3dc-a9f8-4745-8ffb-02c5ca14e511 | spectrumofbunch-by-bunchdata),andmeasurethestrength
of the feedback system.
All measurements are automated usingPythonscripts.
RESULTS
Single-Bunch Case
Threshold MeasurementFigure1demonstrateshor-
izontal (left) and vertical (right) single-bunch instability
thresholds measured at SOLEIL in different years. Simula-
tio... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 0 |
fbcdb45c-728e-48a4-8215-98c45c759389 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP5106
2506 MC5.D06: Coherent and Incoherent Instabilities Measurements and CountermeasuresWEP5106 WEP: Poster session
Content from this work may be used under the terms of the CC BY 4.0 licence (© 2026). Any distribution of this work must maintain a... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 0 |
09bc51e8-c0e3-4141-8373-6178472b6fdf | 0 2 4
Chromaticity, Q′
x05101520Bunch Current, Ib(mA)
a) mbtrack2
2025
2026
0 2 4
Chromaticity, Q′
y05101520Bunch current, Ib(mA)
b) mbtrack2
2007 (inj.)
2023
2023 (inj.)
2025-09
2025-05Figure 1: Horizontal (a) and vertical (b) single-bunch insta-
bility thresholds.
(𝑄′
𝑥,𝑦=0) were determined to be 𝐼tmci,𝑥=4.6 mA ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 1 |
fbb5a52f-f538-4831-88fc-f37a67eb2ad4 | 𝑦≲2.5. For𝑄′
𝑦>2.5,
it jumps to𝐼hti,𝑦≈10 mA. The jump is attributed to an
increaseineffectiveradiationdampingstrengthforhigher-
order azimuthal head-tail modes [24]. For the vertical in-
stability, we see a strong impact of the injection event on
the measurement, similar influence of injectionon instabil-
ities wa... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 1 |
657c6378-f388-4d8f-97d5-02121e4a2c8e | without horizontal feedback. In the SOLEIL case, the mi-
crowave instability (MWI) threshold was measured to be
𝐼mwi≈9.3 mA , which makes it harder to use horizontal
emittance increase as a sign of horizontal head-tail instabil-
ity.
Growth-Damp MeasurementFigure 2 demonstrates a
summary of growth damp measurements in... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 1 |
c88822cc-dfce-4b69-8907-95d3d5a54005 | 0.20 0.22
Tune,Qy101103Spectral power (arb. units)b)
0 1 2
Vert. chromaticity, Q′
y250500Rise time,τ(turns)
c)
0 1 2
Vert. chromaticity, Q′
y2040Damping time, τ(turns)
d)Figure 2: a) An example of measured beam c.m. offset
and fitted growth time; b) An example of a bunch spectrum
during the measurement; c) Fitted insta... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 1 |
e1fc9304-e502-4454-a6f8-24ffbe47b409 | 𝑦=2.5.
The measured damping time of the feedback is in the range
of10turns to 50turns with nominal feedback settings. The
damping time is so short that it is challenging to obtain a
goodexponentialfitofthesignaloverjustafewtensofturns.
In both cases, the observed dependency on the chromaticity
is weak.
Multibunch Case... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 1 |
85b584de-1ed6-4c55-8fdf-1ff6d6e0b062 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP5106
MC5.D06: Coherent and Incoherent Instabilities Measurements and Countermeasures 2507WEP: Poster session WEP5106
Content from this work may be used under the terms of the CC BY 4.0 licence (© 2026). Any distribution of this work must maintain a... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 1 |
6a3c3ecc-b6dd-4902-a263-a94ac0397292 | 0 2000
Time,t(arb. units)□2000200Bunch c.m. (arb. units)τfit= 248 turns
0 200
frequency,f/f0500010000Spectral power (arb. units)
0 250
Bunch number05001000Rise time,τ(turns)τR= 285 turns
0 250
Bunch number05001000Damping time, τ(turns)τD= 206 turnsFigure 4: a) Example of growth-damp beam position signal
withfittedgrowth... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 2 |
ccb385fe-0414-4a27-b88e-792a028141c8 | Growth-Damp MeasurementsFigure4showsanex-
ample of growth time fit of a particular bunch (a), typical
beamoscillationspectrum(b),exampleofmeasuredgrowth
time for each bunch (c), and example of measured damping
time of each bunch (d). In all measured instabilities, all
bunches had very similar growth times and feedback ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 2 |
da22e4bb-f121-451f-ab62-90ade119aad2 | maticity and increases from 𝜏≈200turns at𝑄′
𝑦=0to
𝜏≈1200turns at𝑄′
𝑦=2. The growth rate was measured
at different total beam currents. We found that instability
growth time follows a scaling law 𝜏∝𝐼3/2
beam, which corre-
spondstobeam-ioninstabilityscaling[8]. Togetherwiththe
observed spectrum, this allows us to... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 2 |
087801ed-f250-404a-acbb-5e60f6fb696a | I450 mA (2025 June)Figure5: Resultsofgrowth-dampmeasurements. a)Insta-
bility growth time (scaled) for different chromaticity values;
b)Bunch-by-bunchfeedbackdampingtimeatdifferentchro-
maticities and different machine runs.
weak until the beam oscillation is expected to shift to a
higher-orderhead-tailmode. Inoneserie... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 2 |
474fc2eb-c915-4ddc-9acf-e946a3f480a7 | perturbations when it is close to the instability threshold.
Coupled-bunch instability at 𝐼beam>300 mA is identi-
fied as beam-ion instability driven by H+
2. The transverse
feedbacksystemsuccessfullysuppressesthisinstabilityat
SOLEIL,confirmingthatitispossibletosuppressbeam-ion
instability for SOLEIL II using transve... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 2 |
a13a41b7-fafd-4d8f-ab49-359c4975cd09 | pp. 2723–2727. https://accelconf.web.cern.ch/
e06/PAPERS/THXPA02.PDF
[2]T. Nakamura, “Beam Position Monitor and Kicker for the
SPring-8 Transverse Bunch-by-bunch Feedback”, inProc.
DIPAC’05, Lyon, France, Jun. 2005, pp. 304–306. https:
//jacow.org/d05/papers/POW027.pdf17th International Particle Accelerator Conference,... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 2 |
3f7bdac2-2677-44ae-a305-14dbae6968b1 | [3]T. Nakamura and K. Kobayashi, “FPGA Based Bunch-by-
bunch Feedback Signal Processor”, inProc. ICALEPCS’05,
Geneva,Switzerland, Oct.2005.http://accelconf.web.
cern.ch/ica05/proceedings/pdf/P3_022.pdf
[4]T.Nakamura,“TransverseandLongitudinalBunch-by-Bunch
FeedbackforStorageRings”,inProc. IPAC’18,Vancouver,
Canada, Apr... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 3 |
141c893a-2a7f-498f-83e4-1ab0abc32163 | at SOLEIL”, inProc. PAC’07, Albuquerque, NM, USA, Jun.
2007, pp. 2019–2021.doi:10.1109/PAC.2007.4441131
[8]R.Nagaokaet al.,“FastBeam-IonInstabilityObservations
at SOLEIL”, inProc. IPAC’10, Kyoto, Japan, May 2010.
http://accelconf.web.cern.ch/IPAC10/papers/
TUPD028.pdf
[9]R. Nagaokaet al., “Study of Ion-induced Instabil... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 3 |
b346027d-edf0-443f-ad04-1a82f8f3a422 | [12]L. Nadolskiet al., “SOLEIL II: the French 4GLS Project
- First Year of the Construction Program”, presented at
IPAC’26, Deauville, France, May 2026, paper TUO2M01,
this conference.
[13]V.Gubaidulin,A.Gamelin,A.Loulergue,R.Nagaoka,and
P.Schreiber,“TransverseinstabilitiesinSOLEILIIstorage
ring in the presence of a ha... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 3 |
1d9fe5ca-f0a3-4ec2-9e20-10c17a4f58ac | “StudyofSingleBunchInstabilitieswithTransverseFeedback
atDiamond”,inProc. IPAC’17,vol.IPAC2017,Copenhagen,
Denmark, May 2017.
doi:10.18429/JACOW-IPAC2017-THPVA029
[17]L. R. Carveret al., “Beam based characterization of the
European Synchrotron Radiation Facility Extremely Bril-
liant Source short range wakefield model”... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 3 |
041a5ab4-efa0-40c7-ae12-fc54d2be37d1 | Paris-Saclay, 2025.
[20]Synchrotron SOLEIL, “Conceptual Design Report - Syn-
chrotron SOLEIL Upgrade”, Synchrotron SOLEIL, White
paper, Jul. 2021. https://www.synchrotron- soleil.
fr/fr/file/13803/download?token=OUzsp46P
[21]A. Gamelin, V. Gubaidulin, R. Nagaoka, and S. Thakur, “Im-
proved resistive wall effective radi... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP5106.pdf | 3 |
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