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d7405893-3d1a-4af2-8a00-634984f7524a | response, or slower relaxation processes in the detection
chain.
Applyingthisextractionprocedurewhilescanningtherel-
ativedelaybetweenthe probe pulse and the electron bunch
yields the delay-dependent EO signal amplitude shown in
Fig.2(b). Thedelayaxiswasshiftedsothatthemaximum
signal amplitude occurs at 𝑡0= 0. At nega... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6049.pdf | 2 |
4b8883a3-2fbb-4821-bede-7d9597358916 | itivedelays,thisprovidesstrongevidenceforthedetection
of the transient electric near-field of the electron bunch.
SUMMARY
We demonstrated first near-field-sensitive EO measure-
ments of electron-bunch-induced transient signals in theFLUTE in-air section using a photonic-integrated MZI sen-
sor. The observed response pr... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6049.pdf | 2 |
5f21de19-2b51-4bc8-809a-160c8a3e4fff | thevacuumsectionintothein-airsection,indicatingacurved
wavefront in the sensor region.
Furthermeasurementswithextendedspatialsamplingand
differentacceleratorparameters,suchasbunchchargeand
bunch length, are being investigated to clarify the observed
response function. In addition, the frequency-dependent
responseoftheb... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6049.pdf | 2 |
62aa0e0e-9d27-409f-be31-610f5ca207f4 | ACKNOWLEDGMENT
The authors thank N. Smale, M. Brosi, T. Schmelzer,
J. Schäfer, J. Schmid, M. Schwarz, and S. Schott for fruitful
discussions and support in preparing the experiments.
REFERENCES
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[10]Dassault Systè... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6049.pdf | 3 |
45327dc6-b566-4b35-af6b-82b36c1c9a85 | MEASUREMENTS OF CSR RADIATION AT KARA USING NOVEL
THIN-FILM LITHIUM NIOBATE ELECTRO-OPTICAL SENSORS
G. Niehues∗, E. Bründermann, S. Funkner, M. Noll, J. L. Steinmann, A.-S. Müller,
Karlsruhe Institute of Technology, Karlsruhe, Germany
P. Rabiei, S. Toroghi, Partow Technologies LLC, Carlsbad, CA, United States
I. Wilke,... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 0 |
f483967b-7634-4103-9a64-463167cba6ac | tegratedMach–Zehnderinterferometers,combineastrong
electro-optical response with engineered velocity matching
andacompactdevicegeometry,enablingsensitivedetection
of transient THz fields. Using these Mach–Zehnder inter-
ferometer waveguide structures, we demonstrate efficient
coupling of CSR to the sensors and present ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 0 |
fc45140e-a33f-41b7-b429-c2874869d538 | and thus a change in polarization on a synchronized optical
probe laser beam, enabling single shot measurements of the
pulseshape[7–9]. Recentstudiesincludetomographicre-
construction of the full phase space distribution of electron
bunches [10] and far-field EO detection of emitted radia-
tion[11],underscoringtheexpan... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 0 |
6572d329-461c-482f-bcbc-ba5d55ec3cc7 | waveandthelaserprobe. Theopticalprobebeamiscoupled
tothechipviafibersandgratingcouplers(includedinthe
packagedsensor),whilefreespacecouplingoftheTHzfield
enables a compact setup at the beamline. First measure-
∗gudrun.niehues@kit.eduments with high-intensity THz radiation pulses generated
by optical rectification of fe... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 0 |
e6931df5-30cc-49d9-ad95-1463a0b124a4 | modulation was recorded. The results demonstrate efficient
CSR coupling and sensitivity and validate measurements
withtheTFLNEOsensorasadiagnostictoolforCSRde-
tection.
EXPERIMENTAL SETUP
The experiment was carried out at KARA operating in
short-bunchmode(momentumcompaction 𝛼𝑐=2.6×10−4)
with two subsequently injected... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 0 |
d3a05dff-ef3f-4591-af71-5bebeda2e6ba | tic port of the IR2 beamline was focused with a single
off-axis parabolic mirror onto the TFLN EO sensor (see
Fig. 1). A detailed description of the sensor concept can
be found in [12,13]. The sensor is pumped by a fiber
coupled femtosecond laser ( 90fs,1560nm central wave-
length) running at 62.47MHz and phase locked ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 0 |
a59b94f9-91a8-4a54-ad54-3d0befa7c722 | samples only one bunch.
Asmallapertureintheparabolicmirrordivertsafraction
of the beam to an optical photodiode that serves as a timing
reference. MeasurementsofthefreespaceCSRbeam,cable
lengths,andfiberlengthsenabledaroughestimateofthetim-17th International Particle Accelerator Conference, Deauville, France JACoW Publ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 0 |
cdae2611-2f00-4c66-ada1-e5b54c5f0876 | Figure1: ExperimentalsetupattheIR2BeamlineofKARA:
upper right side is the window of the beam diagnostics port,
the CSR radiation is focused by an off-axis parabolic mirror
ontotheTHzdetection,whileasmallfractionisdelivered
throughalensontoacollimatorconnectedtoaopticalphoto
diode for timing reference. The THz detection... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 1 |
fdfa2921-b947-49f1-89f8-dca8e607e0df | ing a convenient alignment signal. Observing the diode’s
output on the reference oscilloscope, the sensor position
couldbeoptimizedwithoutthetimingconstraintsthataffect
the EO signal. For comparison, details of measurements
using an optical diode and an SBD detector can be found
in [14].
The two sensor fiber outputs we... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 1 |
302c64d4-15fc-4551-95d3-c39535f3052f | pulseandCSRpulse(ASOPStechnique),leadingtoa 2ps/s
Figure3: ScanoftheCSRsignalrecordedwiththethin -film
lithium-niobate (TFLN) sensor at the KARA IR2 beamline
(diagnostic port), showing the time -dependent waveform of
the CSR field.
scanrate. Thelock -inamplifieroperatedwitha 300mstime
constant and a 30mV sensitivity.
F... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 1 |
e9489c01-d8f4-4bdb-bb7d-345cddd79881 | S/N≈27.
Figure4displaystheFourier -transformedamplitudespec-
trumoftheEOSscanwiththeTFLNEOsensor. Because
the time domain scan is 80ps, the spectral resolution is lim-
ited to approximately 12.5GHz . A maximum appears at
approximately 90GHz. Following, the amplitude steadily
decreases. The Fourier amplitudes observed f... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 1 |
688f9661-0460-4367-9228-5e74c8ba1458 | CONCLUSION AND OUTLOOK
The present work shows that a compact, fiber -coupled
TFLN EO sensor can successfully record CSR emitted by
KARA, providing a new diagnostic tool. The measured
spectrum displays a dominant peak just below 100GHz,
which is reasonable due to the CSR spectrum in the short
bunch mode at KARA [15]. Ne... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 2 |
84ca8ef6-235a-4a3c-8e08-3e18c79b7b2b | repetition) so that every laser pulse samples a modulated
CSR burst, eliminating the 23 -fold laser pulses. In this
context, evaluating the handling of the signal without the
need of a lock-in amplifier is an option.
With improved SNR, the potential to employ chirped
pulses and to go towards single -shot detection can ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6050.pdf | 2 |
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[11]C.Szwajetal.,“Recordingthzpulseshapesat88mhzrepeti-
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f2d79f19-1ce7-4831-87bf-7bdbf15803f0 | ofCSRPulseswithFastTHzDetectors”,in13thInternational
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[15]J. L. Steinmann, “Diagnostics of Short Electron Bunches
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7e8087fa-f34f-4b86-acb3-13067112f8f8 | USING A Timepix3 PIXEL DETECTOR FOR A COMPTON
BACKSCATTERING POLARIMETER
T. Schiffer∗, M. Switka†, K. Desch, D. Proft, University of Bonn, Bonn, Germany
Abstract
TheElectronStretcherFacility(ELSA)inBonnhasthe
capability to accelerate and extract spin-polarized electrons.
AComptonbackscatteringpolarimeterlocatedinthesto... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 0 |
2f9b3e6a-d3b6-4663-9d21-53de8b1ad2c0 | pixeldetectorwith55µmpitchanda500µmthicksilicon
sensor is a suitable candidate. It allows to obtaining 2D
beaminformationwithanexcellenttimeresolution(25ns),
enabling for parallel time resolved horizontal and vertical
profile measurements. An in-house developed readout in-
frastructure allows for high flexibility and a... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 0 |
ad54973f-369c-42d9-b0ca-ead0d8394554 | izing resonances have to be crossed. While in the booster
synchrotron the crossing of those resonances has negligi-
ble impact on the beam polarization, additional precautions
have to be taken in the stretcher ring. This is realized by
fastramping tune-jumpquadrupolemagnets andharmonic
orbitcorrectionschemes. Forproper... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 0 |
8fc383e8-4a77-4005-b61c-8a18bc84cdd4 | in development. First tests with this new detector showed
promising results [ 3].
∗schiffer@physik.uni-bonn.de
†switka@uni-bonn.deCOMPTON BACKSCATTERING
POLARIMETRY AT ELSA
Figure 1: Principle setup of the Compton backscattering
polarimeter at ELSA [ 4].
The Compton backscattering polarimeter [ 4] uses a20W
532nmcontin... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 0 |
d8503692-43e5-499c-8629-ee2bd0914ff6 | Here𝑧R, Ldenotesthemeanpositionofthebackscattering
profileforleftorrightcircularpolarizedlaserlightand 𝒟
is the analyzing powerof the polarimeter, which is approxi-
mately70µm/100%.
Since the energy of the backscattered photons is boosted
to energiesup to some hundred MeV,a conversiontarget is
beneficial to increase ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 0 |
2a88933b-8523-47ba-a4f1-c6421e345c74 | During a measurement, the circular polarization of the
laserphotons is altered byarotating 𝜆/4-plate. Duringthe17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6052
2694 MC6.T03: Beam Diagnostics and Instrumen... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 0 |
d5b11a9c-ea17-423c-9c87-8e5f838a72c1 | rotationprocessthelaserbeamisblockedbyafastshutter
to allow for background measurements of bremsstrahlung
radiation from residual gas in the vacuum chamber. Hence,
a typical measurement cycle consists of three individual
measurements from circular left polarized laser photons,
background and circular right polarized ph... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 1 |
6b8a2d3d-f928-4c54-a1ae-cd71e63a4e0f | THE Timepix3 DETECTOR
Conversion target
Timepix3 with sensor
Connection to readout
Figure3: ImageoftheTimepix3detector. TheTimepix3
with the500µm sensor is hidden under the target.
The Timepix3 detector uses a Timepix3 sensor assembly
utilizinga 500µmpn-silicon-sensorbump-bondedontopof
theTimepix3ASIC.AsshowninFig. 3th... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 1 |
2ce25915-d5ad-4109-800a-ba7d09917261 | beam profile shift of ∼ 70µmat100%electron beam polar-
ization. Each pixel can measure the time of arrival (ToA)
andthecharge(timeoverthreshold(ToT))simultaneously
offeringatimeresolutionof 1.56ns. TheASICcanatmaxi-
mum process 40MHits/cm2read out in a data driven mode
suchthatinprinciplenodeadtimeoccurs. Thus,withthe
... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 1 |
eae28f65-2a77-468b-aa4a-5b0e68467c0c | polarimeter. Here, especially a feed-in of the laser system’s
triggersignalsintothe FPGAneedstobe realizedtoallow
more precise mapping of the data to the laser beam polar-
ization states. Also it is possible to combine the readoutand analysis chain such that the detector system can process
thedatainanonlinemode. Firstt... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 1 |
6f51d793-e19e-42bc-a458-6a45ff2dc181 | According simulations are planned to optimize the results.
FIRST RESULTS
In a few data runs the detector was tested at the Compton
polarimeter. Mounted as a temporary device in front of the
microstrip detector it utilized a 11.2mmlead conversion
target mounted ∼ 2cmin front of the Timepix3. With this
010002000300040005... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 1 |
02ba82ec-ef3f-4104-a9a5-9dad94ebf709 | tion phase.
setupmultiplemeasurementsatdifferentbeamenergieshave
beenperformed. Forfirstmeasurementsthe storagemode of
theacceleratorwasused. Herethelaserconstantlyrepeats
the measurement cycle as described before while the stored
electron beam is approximately constant. For the analysis a
singletimestampwasalignedbyha... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 1 |
fa844fce-ff0d-470a-b596-99eda25e9fe0 | surementcycles( ∼ 3s)eachcanbeperformedwithinone
cycle of the accelerator. Since the injection timing of the17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6052
MC6.T03: Beam Diagnostics and Instrumentation 26... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 1 |
d9e18185-d988-462a-ab91-aeb50d47c3f5 | accelerator is varying, timestamps from the laser system
hadtobeusedfordatatimingreconstruction,asshownin
Fig.5. For example, a measurement at 1.6GeVbeam en-
0 100 200 300 400116118120
Time in sMean position in pixels𝑧L𝑧R
Figure 6: Development of the vertical mean position by
accumulating data of multiple measurement... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 2 |
a1b77124-8825-4354-bad1-abd3b013369e | minute the measurement errors cease to decrease.
050100150200250300−1012
Time in sΔ𝑧/pixel2.5GeV
1.6GeV
1.27GeV
Figure 7: Difference between the means for 1.27GeV(stor-
age mode ) and1.6GeV(booster mode ) were taken with a
polarized electron beam, while the measurement at 2.5GeV
(storage mode ) used a non-polarized be... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 2 |
e7f5bc67-4395-4822-b004-ebfaf1127f14 | wereappliedduringtheenergyrampinthistest. Thus,anull
measurement with electrons at 2.5GeVshows the expected
result.
As previous results demonstrategood functionality of the
currentpolarimetersetup,furtherinvestigationswillincludepolarimeter calibration trials via self-polarization (Sokolov-
Ternoveffect)withmoreoptimal... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 2 |
a4d73d9b-c736-4967-86bd-91c49928f715 | chain of the detector, allowing its usage in the booster mode
in addition to the previously demonstrated usage in storage
modeof the accelerator. As a next step different conversion
target thicknesses and materials will be analyzed to find the
optimum working point of the detector.
REFERENCES
[1]W.Hillert etal.,“Beaman... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 2 |
9e9a1197-ebbb-4d46-a602-589f9f520d20 | IPAC2/zero.alt411/papers/TUPC/zero.alt474.pdf
[3]M. Switka et al., “Beam position monitoring and polarimetry
with a timepix3 pixel detector at a compton backscattering
polarimeter”,in Proc.IBIC2025 ,Liverpool, UK,Sep. 2025,
pp. 810–812. doi:1/zero.alt4.18429/JACoW-IBIC2/zero.alt425-WEPMO32
[4]M.Switka,“Photonbasedelect... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 2 |
f057d959-52f5-44ad-ad76-dfd5a63aa1d8 | instrumentation ,vol.9, no. 05, pp. C05013–C05013, 2014.
doi:1/zero.alt4.1/zero.alt488/1748-/zero.alt4221/9//zero.alt45/C/zero.alt45/zero.alt413
[7]M. Gruber, “Development of a gridpix-based x-ray polarime-
ter”, Ph.D. thesis, RheinischeFriedrich-Wilhelms-Universität
Bonn, Bonn, Germany,Jul. 2025.
[8]T. Schiffer, “Dete... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 2 |
8ed0d8f3-c162-4ec0-8657-42494066225c | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6052
2696 MC6.T03: Beam Diagnostics and InstrumentationWEP6052 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 attribution to the author(s), title... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6052.pdf | 2 |
f0073aca-f6ac-4d34-bba5-b5facf69c539 | ENHANCING BEAM TIME AVAILABILITY BY A FACTOR OF TWO:
SIMULTANEOUS OPERATION OF HADRON PHYSICS AND DETECTOR
TEST BEAM LINES AT ELSA
D. Proft∗, M. Ammann, K. Desch, M. Switka, University of Bonn, Bonn, Germany
Abstract
Theelectron acceleratorfacilityELSAhouses twoexter-
nal high-energy beam lines. These deliver primary e... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 0 |
c5cfc4d4-fb4a-4fb2-a772-b3d9771dd7f5 | experimentsatlowrates(tensofkHz)alongsidehigh-rate
hadron-physics experiments at GHz extraction rates, signifi-
cantly increasing beam time availability.
Wepresent properties and underlyingbeam dynamics of
this operation mode, with particular emphasis on advanced
methods for rate control at the second beam line.
ELECTR... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 0 |
d25d380d-ca93-485c-a172-7575cb98a865 | to the main storage ring at an energy of typically 1.2GeV.
After accumulating typically 30mAin the stretcher ring,
the electrons are accelerated up to 3.2GeVand are then
slowlyextractedtooneoftheexperimentalsites. Thefirst
externalbeamlinesplitsupandservestwohadronphysics
experimentalsitesE1andE2. Thesecondbeamlinedeli... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 0 |
5be94df7-c671-4821-bc93-6d83176d1694 | storage ring.
During the extraction, the betatron tune in the horizontal
plane is shifted towards 𝑄x= 42
3by four dedicated fast
∗proft@physik.uni-bonn.de
Figure 1: Electron StretcherFacilityELSA.
ramping air core quadrupole magnets. For each external
beamline separate pre- and main septum magnets are in-
stalled,guid... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 0 |
304be576-6f82-445b-96bf-2258f75cc5b1 | quadrupole current as control value.
10.0
7.5
5.0
2.5
0.0 2.5 5.0 7.5 10.0
x / mm0.04
0.02
0.000.020.04x' / mradxstart = 0.3 mm
xstart = 0.7 mm
xstart = 1.1 mm
xstart = 1.25 mm
xstart = 1.6 mm
Figure 2: Xsuite [ 4] simulation of 5 electrons with different
start amplitudes for 150 revolutions indicating stable ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 0 |
a20ee226-d9ea-4a87-bb48-a09b6d8e80cd | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6053
MC6.T03: Beam Diagnostics and Instrumentation 2697WEP: Poster session WEP6053
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 attribution to the author(s), title... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 0 |
5cbd64a9-fabc-45a4-8a2b-23df90042f17 | structureis formed inphase space at both pre-septummag-
nets. Owingtothephaseadvance,however,theseparatrix
at the second extraction point is rotated in the clockwise
direction by two branches relative to the first.
Asimultaneousextractionallowsconcurrentdelivery of
electrons to both external beamlines and operation of ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 1 |
6c956ee4-131e-4d79-bd86-6d2357b6273c | BGOOD are hosted. For both, either the unpolarized or
thespinpolarizedelectronbeamisconvertedtoalinearly
or circularlypolarized photon beam via bremsstrahlungon
copper or diamond targets. The photon beam is utilized for
photoproduction experiments off nucleons.
Especiallyforthelinearlypolarizedbeam,astableelec-
tron be... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 1 |
7ddd8733-53dc-4a63-801c-89ed0954ed50 | accessing the experimental area.
Detector Tests
Atthesecondexternalbeamlineontheoppositesideofthe
stretcherring,theE3areaislocated(cf.Fig. 1,bottomright).
Here, up to four experiments on movable table-top sites can
be set up. Typical use cases are detector tests using the
primaryextractedelectronbeam. Eachelectronpathi... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 1 |
98134bb1-3e3a-48d9-8a5b-d19523c31c3e | beam times at the E3 beamline last between a few hours up
todays,withinterruptionsonaregularbasistoimproveand
change the detector setup on-site.
Medical Physics
Beside detector testing setups, the E3 area is equipped
withoneexperimentdesignatedtomedicalphysicsresearch.
Goaloftheexperimentistheinvestigationofthesocalled... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 1 |
efb8f269-1ccd-460f-ad3c-3e67c13d817a | for the hadron physics experiments conducted in areas E1
and E2, these experiments are designated as the primary
experiments in the proposed simultaneous extraction mode.
Thedetectortestsas secondary experimentsinareaE3were
found to be well suited for concurrent operation. Due to the
comparativelylowextractionratesrequ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 1 |
20eba97f-637e-4ce1-83aa-660b43defaa2 | performed.
Although the simulations could confirm the feasibility of
thesimultaneousextraction,itwasnotpossibletotransfer
the results into settings on the real machine. Due to mul-
tipole components and misalignment of the accelerators’
mainmagnets, parametersasthetune,tuneshiftspanand
especially the extraction sextupo... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 1 |
e05b6bd6-1642-4634-8e0f-f6d5fb50a54c | ClosedOrbitDisplacement Itwasinitiallyobserved
thattheextractionrateatthesecondextractionsitecanbe
controlled directly by introducing a closed orbit (CO) bump
atthepositionofthepre-septum(seeFig. 3,left). Thismoves
thebeamtowardstheseptumbladeandtherebyincreasesthe
extraction rate. This method exhibits a clear linear d... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 1 |
608e6c20-c7da-4fba-b3fd-beb66b8cb97d | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6053
2698 MC6.T03: Beam Diagnostics and InstrumentationWEP6053 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 attribution to the author(s), title... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 1 |
b1357e18-b3f6-4bb3-b787-6ef8dcfa3836 | Septum Bladeclosed orbit
bumpExtracted
beam
Septum
magnetStored beam
Septum Blade
(adjustable)Extracted
beam
Septum
magnetStored beamFigure 3: Schematic view of extraction process at the pre-
septum with different methods for rate control at the sec-
ondaryexperiment: a)usingaclosedorbitbump,b)moving
of the septum blad... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 2 |
bde61142-0081-4c1e-90c0-5e9effa024f3 | septum towards the beam in order to increase the extraction
rate (see Fig. 3, right). As the impact on the circulating
beamisnegligible,thismethodprovidesexcellentcontrol
on the electron rate in the second external beamline. The
correspondinglinearrelationshipbetweentheextractionrate
andseptumbladepositionisshowninFig.... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 2 |
e04d5027-b255-4b19-a0c0-96597419a5f5 | At the primary experiment the so called tagger rate1was
1Thetagger rate refers to a rate proportional to the conversion rate of
electrons to photons via bremsstrahlung. The conversion efficiency is
approximately1:1000.measured by the CB-ELSA/TAPS experiment. At the E3
area,thedirectelectronratewasmeasuredbya 3cm×3cm
sc... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 2 |
fad453ab-b37e-431c-bb7c-4a078711cb65 | tector test beamline ( 𝑅E3).
CONCLUSION
Herewehavepresentedthedevelopmentandoptimization
of a new operational mode enabling the concurrent opera-
tionoftwoexperimentsviasimultaneousextractionusing
resonant extraction techniques at two extraction points in
an electron synchrotron. This mode has been in routine
operatio... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 2 |
a01738ec-9498-4f2c-8090-08e99e6049b7 | E3 available E3 shutter opened machine development
time /h
Figure 7: Beam times in 2025. Shown are time slots of
primary experiment, of secondary experiment availability
and of requested beam at secondary experiment.
The introduction of the simultaneous extraction mode
has been met with very positive feedback from the ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 2 |
012072e5-118d-45c4-a328-939254829221 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6053
MC6.T03: Beam Diagnostics and Instrumentation 2699WEP: Poster session WEP6053
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 attribution to the author(s), title... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 2 |
95d5da87-3295-49ea-848e-884c27a0008f | [2]N. Heurich, F. Frommberger, P. Hänisch, and W. Hillert, “The
New External Beamline for Detector Tests at ELSA”, in Proc.
IPAC’16, Busan, Korea, May 2016, pp. 4088–4090.
doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt416-THPOY/zero.alt4/zero.alt42
[3]L. Thome, K. Desch, D. Proft, and M. Switka, “Develop-
ment of a fast ex... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 3 |
3f3e886c-d9d5-4146-91d6-4d1b5b24dc00 | doi:1/zero.alt4.114/zero.alt4/epja/i2/zero.alt4/zero.alt48-1/zero.alt47/zero.alt48-1
[6]F. Frommberger, N. Heurich, W. Hillert, T. Schiffer, and
M.T. Switka, “Single electron extraction at the ELSA detector
test beamline”, in Proc. IPAC’16 , Busan, Korea, May 2016,
pp. 4002–4004.
doi:1/zero.alt4.18429/JACoW-IPAC2/zero.... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6053.pdf | 3 |
4099482d-4615-4910-bc05-7d9bf09c7315 | DEVELOPMENT OF THE 2 MeV PROTON BEAM DIAGNOSTICS
SECTION IN PREPARATION FOR NEUTRON PRODUCTION AT FRANZ
A. Ateş∗, L. Bauer, H. Hähnel, P. Müller, R. Tiede, J. Traios, C. Wagner
Institute of Applied Physics, Goethe University Frankfurt, Frankfurt am Main, Germany
Abstract
TheFrankfurtNeutronSource(FRANZ)attheInstituteof... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 0 |
3cade19f-e8cd-4cfe-976d-6bba992695aa | phaseprobesforenergyandRF-phasemonitoring,aswellas
a Faraday cup for current measurements. The camera-based
diagnostics are designed to provide reliable visual feedback
during early commissioning, particularly in an environment
withlimitedaccessandtheradiationlevelstypicalforthis
region of the accelerator. This contrib... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 0 |
d62a2ab7-ba50-4b61-b6b0-de9b0ba94833 | tonbeam[ 1]. Thedriverlinacconsistsof aCHORDISion
source,a60keVelectrostaticpost-accelerator,aLowEnergy
Beam Transport (LEBT) line, and a coupled RFQ–IH-DTL
cavitythatacceleratesthebeamfrom 60keVto2MeV[2].
Following successful commissioning of the 700keVRFQ
beam with 10mApeak current [ 3], the coupled RFQ–IH-
DTLhasbee... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 0 |
b0b56abc-62d3-4a7e-b519-81b21d479b37 | tem for non-invasive transverse beam profile measurements
using Beam Induced Fluorescence (BIF) in residual gas.
∗ates@iap.uni-frankfurt.deDIAGNOSTICS SECTION LAYOUT
Thediagnosticssectionisinstalleddirectlydownstreamof
theIH-DTLexitflange(seeFig. 1). Anexternalquadrupole
triplet, positioned immediately behind the IH-DT... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 0 |
f446b611-f209-4432-a60a-d75b89082fb5 | servation.
•Twocapacitivephaseprobesseparatedbyaknowndrift
distanceforbeamenergydeterminationviatheTime-
of-Flight (ToF) method.
•AFaradaycupat theendof thebeamlineforabsolute
beam current measurement.
•Multiple vacuumviewports for external camera instal-
lationsenablingnon-invasiveBIFprofilemonitoring
from two orthogo... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 0 |
412a2e65-c5b5-4142-9ea2-de8a06fd1c10 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6054
MC6.T03: Beam Diagnostics and Instrumentation 2701WEP: Poster session WEP6054
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 attribution to the author(s), title... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 0 |
647d9b11-43b4-4eb1-923e-d9a5e975d3ef | SCINTILLATION SCREENS & PHASE
PROBES
Scintillation Screen Tests
Priortoobtainingcommercialscintillatormaterial,several
in-house coating attempts were made to produce low-cost
interceptive screens. Copper substrates were coated using a
custom-built spin coater with three different materials: Bar-
ium Fluoride (BaF2), P4... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 1 |
e0ecffa3-d6b1-47e0-9b5a-88e82fd41953 | beam spot imaging throughout the commissioning period.
Figure2: Scintillationmaterialstestedunder 1.9MeVpro-
tonbeam: (topleft)Chromox,(topright)flame-deposited
carbon soot, (bottom left) BaF 2, and (bottom right) P46
phosphor showing severe coating degradation.
Phase Probe Energy Measurement
Two capacitive phase probe... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 1 |
463afbaa-6895-45ba-a7ba-4fee5e4d1dcb | tracecorrelatingtheAD8302outputwiththeFaradaycup
signal, confirming proper beam synchronisation.
Figure 3: Oscilloscope traces showing the macro-pulse cor-
relation between the AD8302 phase probe difference signal
(yellow) and the 1.9MeVFaradaycup signal (green).
IMAGING & VISION
Thecoreofthediagnosticssystemisamulti-c... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 1 |
f48a092d-c3a4-4714-aa88-24f29f85faf1 | surements.
Figure 4: CAD model of the four-camera arrangement
around the beampipe. Two Raspberry Pi 5 units, each
equipped with two cameras, are mounted at 90∘relative
to each other.
Imageacquisitionis managedby a customPython-based
camera server running on each Raspberry Pi, accessible
viathelaboratorynetwork. Aweb-ba... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 1 |
b5be25dd-b60f-47f4-b01d-d7f878ca99f7 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6054
2702 MC6.T03: Beam Diagnostics and InstrumentationWEP6054 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 attribution to the author(s), title... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 1 |
e3320003-17e8-4d99-9d48-1a5083d03a76 | Figure 5: Screenshot of the web-based control interface
showing real-time camera feeds, 1D beam profile extraction
with Gaussian fitting, and 2D heatmap analysis.
crosssectionat 1.9MeVprotonenergyandthelimitedsolid
anglecapturedbythecameras,exposuretimesofapproxi-
mately90sarerequiredtoaccumulatesufficientsignalfor
bea... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 2 |
06c08c60-7c28-4cb7-bc3a-88d30f9fcb00 | IH-DTLcavity. ThecombinationofthesmallIHbeamaper-
ture of24mmdiameter, a turbomolecular pump installed
between the gas inlet and the IH-DTL exit flange, and the
long drift tube of 40mmdiameter acts as an effective differ-
ential pumping stage. This allowed the local argon pressure
inthediagnosticssectiontoberaisedto 5×... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 2 |
e14f6e24-b32d-45bb-a220-a8736b1e8f9b | timemakesBIFaslowermethodthanthescintillatorscreen,
itprovidesthecrucialadvantageofobservingthebeamwith-
outinterceptingit,andallowsqualitativedeterminationof
thebeampositionrelativetothefocalwaist. Figure 6shows
the first simultaneous BIF beam images recorded by all four
camerasduring 1.9MeVprotonbeamoperation. Theima... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 2 |
1db9c887-4556-4380-a8c4-8eebfde7adb2 | projection. Compare with the 3D arrangementin Fig. 4.
TheresultsconfirmthattheRaspberryPi5camerasystem
is capable of imaging the 1.9MeVproton beam through
BIF in residual argon gas. Background subtraction using
dedicated dark frames, implemented in the camera server
software,significantlyimprovesthesignal-to-noiseratio... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 2 |
27f0dd0e-3b45-4d55-b7c6-64d18636d75f | measured beam profiles with beam envelope simulations
using the LORASR code, as well as the installation of a slit-
grid emittancemeasurement deviceand afastFaradaycup
forlongitudinalbeamcharacterisation. Systematicstudies
oftheBIFsignaldependenceonresidualgaspressureand
beamcurrentareplanned,alongwithanimprovementofth... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 2 |
f24a3204-7956-4d04-a5e1-3bc5c4f75acf | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6054
MC6.T03: Beam Diagnostics and Instrumentation 2703WEP: Poster session WEP6054
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 attribution to the author(s), title... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 2 |
0fcd1776-c93c-4c84-8848-3ad018195da3 | [3]H.Hähnel etal.,“Currentstatusofbeamcommissioningatthe
Frankfurt Neutron Source”, in Proc. IPAC’25 , Taipei, Taiwan,
Jun. 2025, paper TUPS039.
doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt425-TUPS/zero.alt439
[4]H. Hähnel et al., “High power conditioning and first 2 MeV
beam results of the coupled RFQ-IH-DTL for FRANZ”,... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 3 |
b49a6ed5-6e65-429d-8975-e35dbe20d893 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6054
2704 MC6.T03: Beam Diagnostics and InstrumentationWEP6054 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 attribution to the author(s), title... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6054.pdf | 3 |
a598df57-41a9-4960-8dcb-d3fae9506e59 | CMOS CAMERA-BASEDOBSERVATION AND CHARACTERIZATIONOF
MULTIPACTING DURING CAVITY CONDITIONING
L. Bauer∗1,2, A. Ateş1, J. Kaiser1,2, P. Müller1, U. Ratzinger1,2, H. Hähnel1,2
1Institute of Applied Physics, Goethe University Frankfurt, Frankfurt am Main, Germany
2Helmholtz Forschungsakademie Hessen für FAIR (HFHF), Frankfu... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 0 |
494a141d-dbd1-46d6-8209-dfa2f85cd3ff | vacuum to detect multipacting and other cavity glowing
effects. The occurrence of multipacting at specific power
levelswithinthecavitiescanbeconfirmedbysimulations. In
addition,theobservedmultipactingischaracterizedthrough
spectrometer measurements.
INTRODUCTION
At the Institute of Applied Physics (IAP) in Frankfurt,
C... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 0 |
53e42a3f-3e4e-430e-bf2c-9596d171dbd3 | thepositionswithinthecavitieswheremultipactingappears,
calculationsbasedonCSTsimulationshavebeenperformed
to confirm the appearance of multipacting at specific power
levels [4].In addition to the optical analysis of multipact-
ing, further characterization wasdone byperforming mass
spectrometermeasurementsattheRFQdurin... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 0 |
5f6e794a-dcb6-4efc-bdbc-ec5c00b5c0f2 | ergyfromtheoscillatingRFfieldandcollidingwithe.g. the
∗l.bauer@physik.uni-frankfurt.decavitywalls[ 5].IftheseremaininphasewiththeRFfield,an
exponential electron avalanche can develop within a few RF
cycles,potentiallydegradingcavityperformance[ 6].Toiden-
tifymultipactingregionscomputationally,aplane-parallel
surface a... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 0 |
860cc1d8-240e-4fca-9b4f-b49dbdcdfd4e | sionscaused bymultipactingand otheroptical phenomena
intheRFQandtheIH-DTLduringconditioning. Theana-
log gain, white balance (AWB), and focal length were fixed
after calibration. Additional to the cameras a mass spec-
trometer and an optical spectrometer were installed at the
RFQ.InFig. 1thepositionsoftheinstalledcamer... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 0 |
1cbd9540-a820-4e58-9f81-5371ef2d7296 | Figure2illustrates the position of both outside the cavity
installedcamerasandtheirFoVs. DuetoitssmallFoVcam-
eraIH-1willnotbefurtherconsideredhere. CameraIH-2
offersadirectviewthroughagrid onthedrifttubesandon
the tuner nearby the exit of the cavity.
MULTIPACTING CHARACTERIZATION
DURING CONDITIONING
Optical multipacti... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 0 |
d7616dd2-5365-4849-aa4d-3f828e2d582a | Figure 1: Positions of the installed cameras, the mass spec-
trometer,andtheopticalspectrometerattheRFQ.Thelower-
left corner of the image shows Version 1 of the installed
cameraintheRFQ,alongsideVersion2,whichcontainsa
3D-printed PETG-Tungsten shielding.
Figure 2: Positions of the cameras installed on the IH-DTL.
(rig... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 1 |
63bc9ea1-f401-4364-a14e-f890daacc140 | the pixel intensity values (brightness) in the acquired im-
ages,acorrelationbetweenimageintensityandmultipacting
signatures, such an increase in reflected power and cavity
pressurecanbefound,seeFig. 5. Duringconditioning,mass
spectra in the 𝑚/𝑧range of 0 to 50 were acquired. During
conditioning, additional mass peak... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 1 |
c3e9e907-f8e8-4925-ae3b-ec5545b72621 | reflectiononthetunerisalsovisibleasareddishspotonthe
leftside. Bothimagesareacquiredwith anexposuretime
of 60s.
tra (Fig.6, bottom), which correlate with the presence of
multipacting. Athigherpowerlevelsabovethemultipacting
threshold, these additional peaks coincide with observed
luminous effects.
CALCULATION OF MULTIP... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 1 |
6cd483b4-a825-421f-9b6f-781bfda2b6f8 | good agreement can be demonstrated for both cavities be-
tween the calculated and experimentally observed power
levels for the occurrence of multipacting. The resulting dis-
crepancies between the calculated and the experimentally
observed multipacting ranges may arise from insufficient
brightness in the images.17th In... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 1 |
4d1a656d-07f7-46cc-8a0b-f485fc2cebaf | Figure 5: Logged data of forward power (blue curve), re-
flected power (purple curve), cavity pressure (red curve),
andimagebrightness(greencurve)duringRFQcondition-
ing from0Wto25kW. The correlation between the cavity
parametersandtheopticalappearance(imagebrightness)of
multipactingisvisiblewithinthered-highlightedrec... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 2 |
07bef126-be9e-40b9-a35d-63f2843d640c | ing,whichoccursreproduciblywithinspecificpowerranges
andcanbeconfirmedbyimagebrightnessalongsidethecav-
ity data such as e.g. reflected power. Calculations based on
the resonance condition showgood agreement with experi-
mentallyobservedpowerlevelsformultipacting. Theresults
indicate, that the camera based observation ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 2 |
ec38235a-6ced-4657-8985-547eea5e43ee | to low intensity. Ongoing and future work includes a radia-
tionshieldingforimprovingtheimagequalityandadvanced
simulations(usinge.g. CSTparticlesolver). Anenhanced
diagnosticssuchasmasssepctrainawiderrange(0-100)and
anopticalspectrometerupgradedwithacollimatorshould
be applied. The integration of an image intensifier ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 2 |
c3ababe6-471d-40f3-8bcf-65402d14dc3b | rescence monitors for low and high energy beams”, in Proc.
IPAC’23, Venice, Italy, May 2023, pp. 4692–4695.
doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt423-THPL1/zero.alt4/zero.alt4
[2]A. Ateşet al., “Raspberry Pi cameras for beam diagnostics
at the Frankfurt Neutron Source”, in Proc. IPAC’25 , Taipei,
Taiwan,Jun. 2025, ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 2 |
d8f40470-2381-4c7b-83e7-fbd8478726ea | Source FRANZ”, in Proc. LINAC’22 , Liverpool, UK, Aug.
2022, pp. 352–355.
doi:1/zero.alt4.18429/JACoW-LINAC2/zero.alt422-TUPOJO/zero.alt48
[4]DassaultSystèmes, CSTStudioSuite: UserManual ,Version
2024, Darmstadt, Germany, 2024.
[5]V. D. Shemelin and S. A. Belomestnykh, Multipactor in Ac-
celerating Cavities . Cham, Swi... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6055.pdf | 3 |
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