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fae22398-a63d-4a08-8728-7d3b924797a7 | Figure 6: Beam lifetime change with and without applied
correction.
Since all BPMs exhibited similar behaviour, only a
representative BPM is shown (Fig. 7) , serving as a
reference for beam position behaviour during the feedback
test. The mean BPM position differs negligibly by 0.014
µm, slightly higher before ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6116.pdf | 2 |
53d92147-563a-4b85-bfaa-4ffe3e5cc5cc | uncorrected cases is −0.81% in the horizontal plane and
2.15% in the vertical plane.
Figure 8: Beta -beating measurement with and without
correction .
CONCLUSION
Correction reaching 66% on vertical plane and 28% on
horizontal plane for chosen undulator minimum settings
was achieved , while maintaining stab... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6116.pdf | 2 |
3ecf4c01-e106-4458-aad8-1ed220098582 | development with the use of research infrastructure of the National Synchrotron Radiation Centre SOLARIS” under
contract nr 1/SOL/2021/2.
REFERENCES
[1] J. Szlachetko et al ., “SOLARIS National Synchrotron
Radiation Centre in Krakow, Poland,” Eur. Phys. J. Plus , vol.
138, no. 1, Jan. 2023.
doi:10.1140/epjp/... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6116.pdf | 2 |
ed1c752b-7550-4b9c-a209-43ccd2d64c7f | undulator in the HLS -II storage ring”, in Proc. IPAC'25,
Taipei, Taiwan, Jun. 2025, pp. 201-203.
doi:10.18429/JACoW- IPAC2025- MOPB066
WITHOUT CORRECTION
WITH CORRECTION 17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.184... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6116.pdf | 2 |
a4aaa8d6-361b-4827-85b8-05a95faed1b8 | BUNCH-BY-BUNCH PHASE PICK-UP SYSTEM IN THE SPS
A. Spierer∗, P. Baudrenghien
CERN, Geneva, Switzerland
Abstract
As part of the High-Luminosity LHC (HL-LHC) project,
the Super Proton Synchrotron (SPS) Low-Level RF (LLRF)
system has undergone a major upgrade during the machine
shutdown in 2019-20 to meet the performance r... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 0 |
4c4760f1-53eb-4528-a0b5-2f5534abd20a | the phase evolution of individual bunches. The system is
implementedontheMicroTCAplatformandemploys5Gsps
digitization of the beam signal from a wall current monitor
(WCM).
Thispaperpresentstheoperationalresultsandcommis-
sioning challenges of the new acquisition and phase loop
system.
INTRODUCTION
The SPS LLRF upgrade ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 0 |
9fa527d8-9c2d-475c-8691-b5bcf0b319e8 | dynamics.
To address this limitation, a wideband bunch-by-bunch
acquisition system has been developed, based on direct digi-
tizationat5GspsofaWCMsignalthatprovidesthelongi-
tudinal bunch profile of the ∼3ns long bunches.
The wideband system overcomes the ∼100ns time con-
stantlimitationofthenarrowbandsystem,whichavera... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 0 |
8eb59894-6762-489d-b4c0-26f82c08502a | •Observation of longitudinal instabilities (dipolar and
quadrupolar), bunch-by-bunch and turn-by-turn
•Direct comparison of beam phase and cavity voltage
•Improvedtime-alignment of signals from cavities and
pick-up
SYSTEM IMPLEMENTATION
Thewidebandphaseacquisitionsystemisimplementedon
a MicroTCA platform using an AFCZ ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 0 |
f43d44f2-5181-4033-a9b1-927effcd4a51 | frequencyiscomputed,equivalenttoIQdemodulationbut
optimized for parallel processing.
Theinputstreamisslicedinto32-samplewindowscen-
teredoneachbunchusingabeam-synchronousNumerically
Controlled Oscillator (NCO) interpolated to the 5Gsps data
rate. Thedataistaggedsuchthatthefirstbunchcanbede-
tectedandsynchronized. Forad... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 0 |
8767726b-daa4-4baf-9b56-71a19f4ab96d | which average on their respective bucket ranges. Figure 1
shows the data-flow.
COMMISSIONING CHALLENGES
Calibration and Delay Compensation
Thesignalpropagationdelayof1.4usbetweenthepick-
upandtheADCintroducesfrequency-dependentphaseshift.
This must be compensated prior to slicing to maintain align-
mentwiththebunchprof... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 0 |
ba827f3a-b3df-4bdf-80ee-08069e1e52d7 | Bucket
compare
Bucket offsetIQ
validTX - RX Cordic SumA
Cavity_phasesAverage
Φhold
Masks
Bucket offsetLong.
damper
Phase
loopΦ
frevΦADC
5GspsFFT 1FIFO 1
interfacedataIQ
FFT 2FIFO 2
interfaceIQ dataNCO G1
Φoffset
NCO G2
Φoffsetread
frev
validSlicer 1
Slicer 2NCO G1
NCO G220*12
frev
validfrev
validfrev
valid
NCO_reset... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 1 |
de8eb5cb-2ac7-4fdd-8fcf-685e8aa1470b | inoperationalcondition,aslowdriftofthebunchposition
withrespecttotherevolutionmarkerwasstillobserved. This
might be due to additional perturbations in frequency.
The stability of beam phase-loop and synchro-loop is
also affected by the difference of their respective processing
latencies. Whilestableconfigurations exist... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 1 |
ddaabec1-5d99-44ef-b0bb-0e7351f418bc | bucketsonly,a holdmechanismwasimplementedtomain-
tain compatibilitywith the narrowbandsystem, see Fig. 2.
The phase value is held for50 buckets or until a change, to
match the behavior of the narrowband chain.
0 200 400 600 800 1000
200 MHz RF bucket0.00.20.40.60.81.0normalized amplitudecavity voltage
narrowband chain
... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 1 |
66ed4d42-2720-4c16-b417-e64b57ea4cef | applied.
Applyingawindowingfunction(e.g.,Tukey)couldfurther
improve phase accuracy by reducing bunch leakage and
distortions due to non-zero window edges.
0 200 400 600 800 1000 1200
sample024amplitude
Figure 3: Bunch profile sampled at 5Gsps. Only the first
(blue) and last (orange) bunches of a batch are displayed.
Th... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 1 |
050edee0-4789-4842-9b21-ef83a44e156b | cavityvoltagemeasuredbytheLLRF.Thecavityphase
is subtracted from the bunch phase for the phase loop.
•Enhanced diagnostics, available for all bunches,
throughthecycleandwithoutcomplexconfiguration.
A typical acquisition is shown in Fig. 5.17th International Particle Accelerator Conference, Deauville, France JACoW Publi... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 1 |
1ba1c219-c785-4fb7-af0a-5be03ac30dfb | 0 200 400 600 800 1000
200 MHz RF bucket8
6
4
2
0246phase at 200 MHz [deg]
cavity phase
LLRF wideband system
independent measurementFigure4: Bunch-by-bunchphasecomparedtocavityvoltage
and an independent measurement. Train of 4x36 bunches
with 1.6e11 protons per bunch, 25ns bunchspacing.
0 100 200 300 400 500 6000.500.7... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 2 |
d2b62515-5004-4448-99dd-e87fb839d575 | quencyrange(200Hz to2kHz). Thebunch-by-bunch
chain uses a 2GHz BW pick-up and direct sampling at
5Gsps. The narrowband chain uses a resonant pick-up
(∼2MHzBW)followedbyananalogband-passfilter
of 4MHz bandwidth. The noise band affecting the two
systemsarethereforemuchdifferent: around200MHz
forthewidebandand2MHzforthena... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 2 |
f3ff607d-aaf5-4bdf-8000-fb17fca0f11e | narrowbandFigure 6: Phase loop error signal for a single bunch beam
andtheassociatedpowerspectraldensity. Thesamplingrate
corresponds to the SPS revolution frequency of 43kHz.
CONCLUSION
A wideband bunch-by-bunch phase measurement system
has been successfully developed and deployed in the SPS
LLRF framework. The system... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 2 |
c5e94902-ce90-4b88-a5d0-85415f93d434 | ACKNOWLEDGEMENTS
TheauthorswouldliketothanktheSPSoperationsand
RFteamsfortheirsupportduringcommissioning. R.Borner
and G. Kotzian for the initial implementation. G. Hagmann
for the support in research and development. B. Karlsen-
Baeck for the reference measurement.
REFERENCES
[1]P.Baudrenghien,J.Egli,G.Hagmann,A.Spier... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 2 |
27a68835-fde7-4339-85f0-b98dbe9cda7f | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6117
2820 MC6.T05: Beam Feedback SystemsWEP6117 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 of the work, p... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 2 |
4899d0f4-0981-4ce2-ade1-818bfe1b7e00 | [3]R.Borner,P.Baudrenghien,andA.Spierer,“SPSbunch-by-
bunchphasemeasurementintheCERNSPSlowlevelRF”,inProc.IPAC’23 , Venice, Italy, May 2023, pp. 4175–4177.
doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt423-THPA/zero.alt49317th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-954... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6117.pdf | 3 |
70c94e03-a2e9-4536-b638-8eb4659127b2 | UPGRADE OF THE LHC LOW-LEVEL RF BEAM-CONTROL FOR THE
DIGITAL FREQUENCY DISTRIBUTION OVER WHITE-RABBIT
A.Spierer∗,T.Gingold,A.Goujon,G.Hagmann,M.Jaussi,L.Kaffka,H.Timko,
CERN,Geneva,Switzerland
Abstract
InpreparationfortheHigh-LuminosityLHC(HL-LHC)
era,asignificantupgradetotheLHCLow-LevelRF(LLRF)
Beam-Controlsystemisbei... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 0 |
a5796ad2-d9d3-421e-9fa8-da377fb20c88 | approachenablesascalableRFdistributioninfrastructure
across the accelerator complex and experiments, with im-
provedphasestabilityandreducednoise.
Thispaperpresentsthemotivationanddesignoftheup-
gradedsystem,includingthemethodusedtoachieverobust
phase synchronization over WR. Finally, it shows results
obtainedfromadedi... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 0 |
6098f7f8-1d62-450f-b50e-fef4c6199c27 | hasbeendeployed, basedonafirstimplementationinthe
SPS[1]. TheconceptistosendframescontainingFTWs,
referencephases,andcontrolsignalsovertheWRnetwork.
ThesearereceivedandappliedtoaNumericallyControlled
Oscillator(NCO)intheRFnodeswithdeterministiclatency.
Thisnewdistributionisinstalledinparallelwiththeex-
istinganalog-ove... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 0 |
30d3711f-d84a-4a22-b053-c322e16abf23 | ∗arthur.spierer@cern.ch
Master clock
10MHz (GPS)CCR WRS
GM
WRS
GMT Master
LHC Point 4
(SR4)
New beam
control
WR2RF
programWRS
WRS
LHC Point 5
(CMS)L0
L1
L2
L3
WRSL4WRS
L2WRS
RF-trainL5 WRS
WR2RF
masterWRS
L5
WR2RF
Op. freq
program
RF-txScope 1
VCXOScope 2
RF-rxWRS
RF
To labs
Beam
loopsCCRSR4 CMS+Crab cav.
LHC ring
... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 0 |
d74f84cc-0f77-4d03-85bc-9c785683ba2f | croTCA board and WR2RF VME board [ 2]. They re-
placeseveralVME-basedmodulesforthefunctiongenerator
(FGC),frequencyprogram,analogandopticaldistribution.
The function generator is now embedded in the AFCZ
FPGAandplaysthepredefinedfrequencyprogramofthe
LHC(around 400MHz). Thefrequencyisconvertedtoan
FTWandtransmittedwith... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 0 |
072f3c24-dd70-4283-a2a7-33b730343fd4 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6118
2822 MC6.T05: Beam Feedback SystemsWEP6118 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 of the work, p... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 0 |
859d35e3-ece8-4d2f-87a3-de1a4d23a85a | FPGAFTW_master
NCO_resetcordiccos(IF)
sin(IF)FTW_LO_intHRFwrap.
detectFrev
Re-
sync NCO_resync
Fc_resetload (WR -rx)latchphase_mastercomp. phase_error
phase_H1
phase_errorlatch
FTW_LO_frac
clk_125M Div. 5H1
Accum.
Int. LO
Accum.
Frac. LO
Accum.
DDSIF DAC
FTW_LO 32LOmixer
modulator RFNCOWR core +
RoE
TAI to FcTAI
Fc_v... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 1 |
d8af961a-5734-4c69-8fcf-0e2f632aaf0c | controls NCO_reset,NCO_resync,DDS_resync
phase_prog* 48bitreferenceprogramphase
phase_master* 48bitreferencemasterphase
Total Payload 50 bytes
Network and Infrastructure
The distribution network consists of multiple layers of
WRswitches(WRS).Layer0(L0)isthetoplayer,locked
totheGPSmasterclock,whileendnodesareconnectedat... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 1 |
d4994a51-2cd6-4d7c-a3e4-dd003c103408 | to 128 µs, accounting for multiple switch stages and over
10kmoffiber.
Function Generation and Firmware
Anembeddedfunctiongeneratorhasbeendevelopedto
replacethelegacyhardware. Itisfullyintegratedintothe
LHCsettingsmanagementsystem.
Itusestablesof4096vectorsoftimeintervalsandslopes
with interpolation, supporting the 30-... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 1 |
09760477-ee14-40a8-b2c6-3d792d318eb5 | continuous,globalresetscannotbeappliedastheywould
causephasediscontinuities. Synchronizationmechanisms
arethereforeimplementedtorecoverphaseautomatically.
Synchronizationisensuredbythefollowingprinciples,
alsoshownonFig. 2:
1.AlldevicesuseWR-recoveredclocks,whichareinher-
entlyphase-aligned.17th International Particle ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 1 |
315ef6ff-e300-4e3d-98ea-8df777e9c241 | Figure 3: Comparing the phase noise of the current and
new RF reference generation. Tuning the PLL shows an
improvement in phase noise at the output of the WR2RF
(dashedtraces).
2.Fixed-latencytransmissionensuresthatFTWsareap-
pliedsynchronouslyacrossreceivers,preservingrela-
tivephasefromstartup.
3.Referencephasefromt... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 2 |
8c14acd7-8036-4ef9-970e-6a6778618a21 | example,theWR2RFuses:
•a32-bitDDSat1GHzforanalogLO(~413MHz),
•a48-bitNCOat125MHzfordigitalLOandRF.
Frequenciesaredefinedusingtheleastcommonmultiple
(LCM)oftheirresolutionsteps( 232mHz). Thisprocessis
extendedacrossallsystems.
Toreducesynchronizationtime,frequencygranularityis
coarsened,reducingtheperiodof 𝑓𝑐. Incases... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 2 |
a82fe8bd-7ced-4275-98bb-c05d8c1c2d44 | ison with beam phase measurements and the existing dis-
tributionsystem. Withresetsateachmachinecycle,which
areonlynecessaryatthecurrentdevelopmentstage,phase
variationsbetweenthetwosystemsremainwithinRFnoise.
Phaserecoveryafterpowercyclingandglitch-freeresyn-
chronizationweresuccessfullydemonstratedinthelabora-
tory.
... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 2 |
668016fd-874c-4bd9-ac9d-87748c8d04ef | bytheanalog-over-fibertransmission,alimitationnot
presentinRFoverWR.
•below50Hz,thephasenoiseisdegradedbytheWR
recoveredclocknoise. A7dBimprovementat 20Hz
isexpectedbyoptimizingthePLLsettings,andfrom
thenextWR2RFhardwaregeneration.
CONCLUSION
TheupgradedLLRFsystemandWR-basedRFdistribu-
tionweretestedinparallelwiththeop... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 2 |
599d4f4c-086a-474c-a451-9711b0f67227 | ACKNOWLEDGEMENTS
TheauthorswouldliketothanktheLHCoperationsteam,
and particularly M. Hostettler, for the integration of the
system and support during machine development, as well
asallcolleaguesinvolvedfromElectronicSystemsforEx-
perimentsandControlsElectronicswhocontributedtothe
successfuldeploymentandmeasurements.17t... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 2 |
9af06ff6-0592-4f8a-be66-901b8cd325f5 | REFERENCES
[1]A.Spierer et al.,“TheCERNSPSLowLevelRF:TheBeam-
Control”, in Proc. IPAC’22 , Bangkok, Thailand, Jun. 2022,
pp.895–898.
doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt422-TUPOST/zero.alt421
[2]G. Hagmann et al., “HL-LHC RF Distribution over White-
Rabbit: TheWR2RFandeRTMmodules”. https://indico.
cern.ch/event/1... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 3 |
ab4000ba-9eb9-4dd4-8024-1d80793e0c87 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6118
MC6.T05: Beam Feedback Systems 2825WEP: Poster session WEP6118
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 of the work, p... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6118.pdf | 3 |
421dd03f-0fd3-4f25-9c48-bc5596428ecf | AN AUTOMATED PRODUCTION TEST SUITE FOR CAPACITIVE
ALIGNMENT SENSOR CONDITIONING ELECTRONICS∗
R. Fernandez Bautista†, B. Spoelstra‡, I. Ustenko, J. Kampp, A. Martinez Landete, M. Sosin
European Organization for Nuclear Research (CERN), Geneva, Switzerland
Abstract
TheHighLuminosityupgradeoftheLargeHadronCol-
lider (HL-L... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 0 |
2bbcc4c8-c9b0-47f9-a06c-ecf52ac136bf | withsub-micron-levelresolution. Thesensorsareconnected
viadedicatedcablestospeciallydesignedWPScondition-
ing electronics for signal processing and data acquisition.
Thesemodulesoperateasapplicationspecificcardswithin
CERN’s Distributed Input/Output Tier (DI/OT), a standard-
ized framework designed for modular electron... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 0 |
5ab03a45-b61e-48e1-a59e-caeaa2ed7ef4 | conditionerelectronics,focusingonhardware–softwarein-
tegration and its role to enable reliable production testing
for the HL-LHC.
INTRODUCTION
TheHL-LHCaimstoincreasethecolliderintegratedlumi-
nositybyroughlyoneorderofmagnitudeoveritsoperational
period,tighteningtolerancesonthealignmentofmagnets,
crabcavitiesandotheri... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 0 |
0c0aec69-d183-472c-87dc-08eb4276a298 | charge-balancing readout and provides digitised position
data to a DI/OT Systemboard [6]. With over 400 of these
∗Work supported by the HL-LHC project at CERN.
†roberto.fernandez@cern.ch
‡info@baukespoelstra.comunits to be manufactured and tested, a scalable and repro-
ducible validation process is required, given the ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 0 |
4b91f79d-612b-4ea1-b2fe-d8d15949fecf | each side of the interaction-region.
Figure1: a)WPSsensorwithCarbon-Kevlarwirepassing
through it. b) WPS Conditioner board.
Opposingelectrodepairsformtwodifferentialchannels
measuringvertical(Z)andhorizontal(X)displacementof
the wire relative to the sensor centre. The WPS Conditioner
(seeFig. 1b)excitestheelectrodeswit... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 0 |
be049f33-267d-4f98-b3ce-3f193e975ecb | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6120
2826 MC6.T17: Instrumentation: Alignment and SurveyWEP6120 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), titl... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 0 |
580da019-dfd3-48d3-b56f-e151577da24b | The card under test is installed in a DI/OT crate, con-
nectedtothesensorviacables,andreadoutoveranRS-485
interface using dedicated software. Operators adjust poten-
tiometersonthecardwhilewatchinglivereadouts,compare
themeasuredpositionswithreferencedataandmanuallyfill
papertestreports. Thisapproachisslowwithrepeatedm... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 1 |
ce0fbcd1-26f2-413e-8945-31df981ebeb2 | Interface (SPI),RS-485, Inter-IntegratedCircuit (I2C)
and hardware reset.
•Realize a hardware-equivalent WPS sensor in four dis-
crete positions, usingdiscrete mechanical capacitors,
achieving differential capacitance within 5% of that of
a real sensor.
•Verifypositionaccuracywithin ±150stepsatthecentre
and±1000stepsat... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 1 |
653ea327-61f8-4d6e-8ca0-604324783cb3 | designed as a modular system that integrates with the exist-
ingDI/OTcrate(seeFig. 3). Itconsistsofamainboardthat
occupiestheDI/OTSystemboardslot[6],eightsensoremu-
latorsthatconnecttoeachofthefront-panelsensorinputsof
the eight Conditioners (under test) and two 4-channel USB
oscilloscopes for active shield measurement... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 1 |
e84c50fe-49e8-481c-a59a-c86898ab596b | single faulty card pulling down the bus.
RS-485communicationisimplementedwithaMAX3490
transceiver connected to the CM5 and also accessible via a
front-panel USB-B connector.
ThebackplaneI2CbusandresetlinesarebroughttoCM5
GPIOsandexpanders,andabufferedresetlineallowsthe
PTS to assert the Conditioner reset per slot.
ForF... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 1 |
68b28708-f7d3-4f9b-8991-6e65c2093c0d | minedfrommeasurementsofarealWPSsensorinstalledon
itscalibrationbench[7]. Themeasureddifferentialcapac-
itance is around 142 fFfor the full scale positions [8] and
was used as the design target.
Theemulatorrealisesthesevalueswithcarefullyadjusted
mechanicalcapacitorsandsignalrelaystoswitchbetween
the different positions... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 1 |
8560188f-f050-4f2e-8cb0-ae9fce76c351 | Active Shield Measurement
The active shield driver on the Conditioner produces a
±10 Vsinusoid with configurable frequency, driving the
sensorcableshieldsandfront-endcoppershields[8]. Ina
pre-seriesproductionoftheConditionercards,adefective
DC–DCconverterreducedthe ±15 Vsupplyrails,leading
toclippedwaveformsofonlyabout... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 2 |
63d3a60b-2806-4a6f-a489-20826f74f67e | Test Sequencing and GUI
The PTS control software is built around the pypts frame-
work already used at CERN for other DI/OT production test
benches[11]. TestsequencesaredefinedinYAMLfilesthat
specify the order of actions, parameters (e.g. SPI register
addresses, RS-485 frame codes, emulator positions) and
expected pass... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 2 |
de3377ae-0663-4cf2-b406-e9217547e58e | vokesMicrochipDirectC[10]toprogramthecorresponding
FPGA bitstream over JTAG for all installed slots, verifying
each device before proceeding to functional tests [8].
The same PTS firmware images are used as in the final
installationfirmwarechain,ensuringconsistencybetween
production validation and operational deploymen... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 2 |
e60aa728-86b8-42f9-a885-a4d1430126b0 | Upon completion, the PTS either creates or updates an
EDMS“Report”documentreferencedfromtheassetentry
[8]. Inaddition,selecteddetailsfromthetestrun(e.g.FGPA
firmwareversion,testdate,etc.) arepushedintodedicatedEAM custom fields to allow quick filtering and statistics on
large batches.
VALIDATION
Hardware Validation
The... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 2 |
5973172d-3c19-4165-a685-237db8eb8f4a | Functional Coverage and Fault Detection
Using the sensor emulator, the PTS can automatically
sweepallfourpositionsperchannel,checkthatthemeasured
stepvaluesfallwithinthespecifiedtolerancesandmonitor
stability over configurable time windows [8].
Tests on pre-series cards showed that stability require-
ments (within 5 st... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 2 |
194ff2f1-6196-4a6b-a029-1116897174e1 | with CERN’s documentation infrastructure.
Theonlyremainingopenpointisthefulldemonstration
of batch testing with eight cards in a single crate, which
is under commissioning; the current setup has so far been
operatedwithsinglecardswhileusingthesamehardware
and software framework.
CONCLUSION
An automated PTS for the WPS ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 2 |
6ac2aa09-77f1-4c03-b2e0-f66dde01dcff | peatability,testcoverageandtraceabilitythroughintegration
with CERN’s EAM and EDMS infrastructures.
Futureworkwillfocusonrefiningtheemulatorforon-site
cable validation use and tightening automated diagnosis of
specifichardwareissuestofurtheracceleratecommissioning
of the HL-LHC alignment system.17th International Parti... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 2 |
8e738de7-bc32-4d6a-ad33-1c6377cceec9 | REFERENCES
[1]CERNYellowReports:Monographs,“CERNyellowreports:
monographs, vol. 10 (2020): high-luminosity large hadron
collider (HL-LHC): technical design report”, Dec. 2020.
doi:10.23731/CYRM-2020-0010
[2]H.MainaudDurandandP.Fessia,“Fullremotealignmentsys-
tem”, CERN, Functional Specification EDMS 2166298, Sep.
2019.... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 3 |
53cee7c0-e6d7-4fee-8923-11d2aa3091e4 | board,https://ohwr.org/projects/diot-sb-igl/[7]P. Sarvadeet al., “A novel calibration method for the high
luminosity lhc wire positioning system sensors”, inProc.
IPAC’25, Taipei, Taiwan, Jun. 2025, pp. 2992–2995.
doi:10.18429/JACoW-IPAC2025-THPS018
[8]B. Spoelstra, “Development of a production test suite for the
WPSco... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 3 |
bb18e06c-79c7-496a-a38d-f979369ee56c | [11]BE-CEM-MTA,CERN,CERNpypts:ahardware-oriented
testing framework, 2026, https://github.com/CERN/
pts-framework17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6120
MC6.T17: Instrumentation: Alignment and Surv... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6120.pdf | 3 |
3b6b3c52-6d57-43c4-a393-9207a63a6b80 | HIGH- PRECISION THREE -AXIS TESLAMETER FOR
SUPERCONDUCTING MAGNET ALIGNMENT OF A GYROTRON AT THE
SWISS PLASMA CENTER*
D. Popovic Renella, Z. Mitrovic, S. Milosevic , SENIS AG, Baar, Switzerland ,
J. Genoud, École Polytechnique Fédérale de Lausanne, Swiss Plasma Center (SPC), Lausanne,
Switzerland
Abstract ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 0 |
d6b0cb5a-f7b1-46f0-93b1-ea68cd86a17d | The Teslameter achieves DC accuracy better than 100 ppm
and 1 µT resolution. The system was employed to verify and optimize magnetic field alignment for high -power gy-
rotrons, vacuum electronic devices generating sub- te-
rahertz radiation via the cyclotron ma ser instability. Effi-
cient operation of these devices ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 0 |
64bc0ddf-cefb-4fc5-838a-50ead254e6b1 | onance Heating and Current Drive systems in magnetic
confinement fusion research.
INTRODUCTION
High -power gyrotrons are critical components in Elec-
tron Cyclotron Resonance Heating (ECRH)
and Current Drive systems used in magnetic confinement fusion research. Their efficient operation depends on pre-
cis... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 0 |
ddf843e6-d4ae-44a5-8353-d1bcd25b2964 | HIGH- PRECISION 3 -AXIS TESLAMETER
The 3MH6 -E Teslameter (see Fig. 1) combines a highly
compact three -axis Hall sensor with advanced analog and
digital electronics within a modular measurement plat-form. The instrument offers four selectable magnetic field ranges: ±100 mT, ±500 mT, ±2 T, and ±20 T. It achieve... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 0 |
1506359f-492a-446f-8d2d-027a1f4f0b3d | Figure 1: 3-axis Teslameter 3MH6 -E, reproduced from
SENIS website [ 1].
The signal processing architecture includes low -noise
amplification, 24 -bit analog -to-digital conversion, and dig-
ital correction algorithms addressing linearity, thermal
drift, and orthogonality deviations. Integrated temperature
se... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 0 |
ec04c14d-1887-446a-bfca-79502dbdc372 | tion devices, and superconducting magnets. For instance,
within the HITRIplus project coordinated by CERN, the
____________________________________________
*Swiss Plasma Center (SPC ):
https://www.epfl.ch/research/domains/swiss -plasma-center/
17th International Particle Accelerator Conference, Deauville, ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 0 |
4a528ebb-8f34-429e-a42f-b60c722443ed | system is used for precise vector field measurements at lo-
calized points with minimal spatial disturbance [ 2]. It is
also applied at the Swiss Plasma Center (SPC) for gyrotron
magnet alignment as described in this paper .
In applications such as undulator field mapping, the
3MH6 -E demonstrates superior sp... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 1 |
278fd7fc-5ebb-481a-bbe3-f7997a7b3b09 | vertical Hall elements, which detect magnetic field compo-
nents parallel to the chip surface, and horizontal Hall ele-
ments, which measure the perpendicular component. This
configuration enables simultaneous acquisition of Bx, By,
and Bz, as well as the total magnetic field vector at a nearly
single spatial locat... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 1 |
2cea32c4-1e63-4a45-a639-4675457fe1ba | olution of 1 µT in the three -axis configuration, represent-
ing a significant improvement over earlier vertical Hall
sensors, which typically achieved resolutions around 20 µT
at 1 kHz [ 8].
The SENIS three -axis Hall sensor achieves a magnetic
field resolution of 1 µT and features an exceptionally small
FS... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 1 |
bd2edc19-93a6-433c-bc49-1ace519ffbb4 | and stored in each probe’s EEPROM. The expanded meas-
urement uncertainty is 0.01% of full scale.
The calibration includes the measurement of the probe
sensitivity 3*3 matrix and, subsequently, its amendment to obtain the correct diagonal matrix. Thereby SENIS pa-
tented techniques [9, 10] are used. A stable magnet... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 1 |
23edce2c-e0e3-4411-b6ef-ab200b3664c2 | ing at the Swiss Plasma Center (SPC) .
In Fig. 3 is shown two dual -frequency gyrotrons used at
the Swiss Plasma Center. One of the key advantages of us-
ing a gyrotron as an electromagnetic source is its relatively high electronic efficiency, which can reach up to 50%. This
requires a very precise alignment betw... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 1 |
c2a83eb1-463e-4de3-90c4-46d07c732357 | position, whe re the electron wave interaction takes place.
Here, the magnetic field amplitude sets the required elec-tron cyclotron resonance frequency, while the uniformity
17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JA... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 1 |
0405a4c1-c310-49f1-bb3e-a13f7460e26e | of the magnetic field profile is essential for optimizing the
electron wave interaction . Several numerical and experi-
mental studies have addressed the effect of magnetic field
misalignment [1 1,12]. At SPC, when procuring a supercon-
ducting magnet system, we require the magnetic field axis
to remain within a cyl... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 2 |
3b1d7e0d-0cf2-4d35-9432-5e5c38a11664 | the magnet bore and allows precise positioning of the probe
at different longitudinal (vertical) positions and azimu thal
angles, either on -axis or slightly off -axis.
Figure 4: Custom -made probe holder for the SENIS
3MH6 -E probe.
Reported below is a typical magnetic field misalignment
measurement perf... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 2 |
9628e668-fa68-4b9a-9c13-4645feeb5f6e | position slightly offset radially (off axis) and over a full
rotation around the bore axis. If the magnetic field axis is
perfectly aligned, the longitudinal component Bz should
not vary during the azimuthal rotation. The maximum dif-ference in the Bz amplitude is thus directly related to the
tilt or shift of the m... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 2 |
a5d8fa36-32ce-4165-b2e2-758e04a5a94f | required value. The measurements at the positions above
and below the magnet center are in phase, as expected for
a minor tilt.
The measurements presented above are the final verifi-
cation step, confirming that the alignment was within the
required tolerance. This completed the magnet installation
procedure and ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 2 |
4975dea5-3691-449c-bc90-cc00e1bfa276 | research systems. Future work will focus on further im-
proving measurement automation and integration with
alignment contr ol systems.
17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6121
2832 MC6.T17: I... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 2 |
d84e2769-4b53-460f-8f1b-0830391fedda | REFERENCES
[1] 3-axis Magnetic Field Teslameter 3MH6 -E:
https://www.senis.swiss/magnetometers/tes-
lameter- digital/3mh6- e-high-precision- tes-
lameter- with-interchangeable- hall-probes/
[2] HITRIplus Project: https://www.hitriplus.eu/
[3] R. S. Popovic, “The vertical hall -effect device,” IEEE Elec-
tron De... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 3 |
14febc92-262e-451a-b971-eb1157e33e1a | Sens. Actuators, A , vol. 97 -98, pp. 47– 53, Apr. 2002.
doi:10.1016/s0924- 4247(01)00859- 7
[7] S. Dimitrijevic and R.S. Popovic, “Vertical Hall Device”,
Application : High -resolution CMOS integrated vertical
Hall device. Patent EP14176835.8
[8] Lu et al., "Performance Analysis of Vertical Hall Devices,"
IE... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 3 |
b2c692dc-1097-48ff-9fe7-0bfb5f747571 | [12] T. Idehara et al. , “Study of Electron Beam Misalignment in
a Submillimeter Wave Gyrotron,” Int. J. Infrared Millimeter
Waves , vol. 19, no. 10, pp. 1303 –1316, Oct. 1998.
doi:10.1023/a:1022611520012
[13] J.-P. Hogge, “Accurate gyrotron magnetic axis determina-
tion,” in Infrared and Millimeter Waves, Conf. D... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6121.pdf | 3 |
71adb633-28d1-467d-8ac2-4715924b4b17 | RADIATION PROTECTION FOR
LASER –PLASMA ACCELERATOR FACILITIES AT DESY
S. Zander†, S. Bohlen, M . Kirchen , A. Leuschner, T. T. Liang, A. R. Maier,
A. Martinez de la Ossa, E. Panofski, K. Schubert, M . Thevenet, P. A . Walker, I -L. Yeh
Deutsches Elektronen -Synchrotron DESY , Hamburg, Germany
Abstract
DESY... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 0 |
6e720d9a-d912-49ca-bfb7-098a5d351bf9 | VERA facilities at DESY . However, LPA systems intro-
duce new challenge s for radiation protection due to broad-
band emission spectra and the interplay of high -power la-
sers with plasma -generated secondary radiation fields. This
contribution presents the radiation- protection concept for
LPA facilities at DESY ,... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 0 |
3c8e0488-241e-4bec-b4e5-3b5e6f016821 | celeration gradients orders of magnitude higher than con-
ventional radio -frequency (RF) accelerators enables com-
pact machine designs with significant potential for future
accelerator technology. At DESY , this development is ex-emplified by facilities such as FLARE, LUX, KALDERA
and VERA .
However, the transi... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 0 |
0a6767a8-0d50-4a37-a066-8e7b13189dd8 | This paper presents radiation protection challenges and
mitigation strategies for LPA facilities, with a focus on ex-
perimental and simulation studies performed at KAL-
DERA. Particular emphasis is placed on radiation genera-
tion close to the laser -plasma source and the contribution
of large -angle, low -energy e... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 0 |
993608e3-7477-471d-bff6-b8ff4961eef8 | tional components, including neutrons , to the mixed radia-
tion field .
As emphasized in established radiation protection litera-
ture [2, 3], the relative contributions of the various radia-
tion components depend heavily on the electron energy, the
accelerator’s beam power, the beam loss geometry, and the
surrou... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 0 |
b77b3d0d-8006-4cae-aedd-6ccf3e214abf | bremsstrahlung as a function of electron energy for differ-
ent emission geometries [2, 4].
________________________________ ____________
† sven.zander@desy.de
17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 0 |
101258ca-8205-41a0-9244-86d3bfeae1dd | In LPAs, radiation generation is strongly influenced by
unique beam characteristics, including percent -level en-
ergy spectra and large angular spread , often resulting in
distributed beam losses. Furthermore, potential low -energy
electrons, which are often not properly transported to diag-
nostics still contr... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 1 |
c33f8257-fda7-45a8-a19e-8cc93bbf3f4d | accelerator tunnel, which is classified as a restricted area
during operation (Fig. 2).
The accelerator tunnel is surrounded by approximately
1-m-thick concrete walls and ceiling. The beam dump de-
sign combines layers of iron, concrete, and lead to effec-
tively attenuate both photons and neutrons.
Figure 2... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 1 |
40f04bf7-72fb-478f-ae0d-dc108e9ad6a8 | ing of the facility, ensuring compliance with dose limits even under maximum conditions.
To verify the shielding performance during operation,
active dose monitoring is implemented using LB6419 de-
tectors installed outside the shielding. In addition, one de-
tector is placed inside the tunnel to support radiation f... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 1 |
e2663756-7f27-4b1f-8947-1df9d2766f95 | [1].
However, radiation measurements during commission-
ing revealed significantly higher dose rates inside the ac-celerator tunnel, with values exceeding 1000 µSv/h for the
electromagnetic component of the dose. This is signifi-
cantly above the 60 µSv/h predicted by the initial simula-
tions, even though the meas... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 1 |
75747ff5-cb77-4090-b938-1fdac533073a | proximately 70
o, with a significant fraction of low -energy
electrons in the few -MeV range. The total emitted charge
was orders of magnitude larger than what is transported to
the dump.
Figure 4: Electron spectrum obtained from PIC-Simul a-
tions [4].
17th International Particle Accelerator Conference, D... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 1 |
12d9960f-5bfc-467f-b09e-2ebdabe80b54 | Thus, u pdated FLUKA simulations incorporating the
full PIC -derived phase -space distribution show a dramatic
shift of the shape of the radiation field inside the accelera-
tor tunnel, which leads to higher dose rates at the radiation
monitor in the tunnel and reproduce s the experimental
measurements more consis... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 2 |
22f3bf4b-ab59-4f25-b1dc-c06ce8d07f34 | IMPLICATIONS FOR
RADIATION PROTECTION
The results demonstrate that secondary radiation at LPAs
is not limited to localized beam dump losses but is signifi-
cantly influenced by distributed electron beam -loss sources
near the laser-plasma target. Low -energy electrons emitted
at large angles dominate dose levels... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 2 |
b325984c-4b51-4698-aa14-887ec2f649dd | to degradation or failure of electronic systems, while per-manent magnets may experien ce radiation -induced demag-
netization , especially in the vicinity of the laser -plasma tar-
get. Consequently, sensitive equipment must be adequately
shielded to prevent damage from the high-energy mixed
radiation fields gen... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 2 |
93f01631-6c25-46e9-b76c-e2573d35def5 | chamber as a significant source of ionizing radiation in the
lower -MeV rang e.
CONCLUSION
Radiation protection at laser-plasma accelerators re-
quires new approaches that account for the unique beam properties and distributed radiation sources. Experimental
and simulation studies at KALDERA demonstrate that low-en... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 2 |
00de071e-10dc-4214-bf7f-07539ec45639 | [3] NCRP , “Radiation protection for particle accelerator facili-
ties”, NCRP Report No. 144, 2003. https://www.sev-
erin.su/wp- content/uploads/2020/01/ncrp- re-
port-no-144-radiation- protection- for-parti-
cle-accelerator- facilities.pdf
[4] S. Bohlen et al, “Radiation safety challenges in plasma accel-
erators ”,... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 2 |
d481620b-37eb-4ad9-9e16-82eb72a15447 | clear Data Sheets, vol. 120, pp. 211-214, 2014.
doi:10.2016/j.nds.2014.07.049
17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6124
2836 MC6.T18: Instrumentation: Radiation Monitoring and SafetyWEP6124 WEP... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6124.pdf | 2 |
660ca864-322d-4b18-821d-b56cffabeb3f | GSI OPERATION STATISTICS IN THE FAIR CONSTRUCTION PHASE
(2012 – 2025): TRENDS, FAILURESAND LESSONS LEARNED
O. Geithner∗,1, M. Klich1, M. Vossberg1, A. Bloch-Spaeth1, H. Stemmler1, R. Assmann1,2,
S. Reimann1
1GSI Helmholtz Centre for Heavy Ion Research, Darmstadt, Germany
2JWGU, Frankfurt, Germany
Abstract
We present op... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6127.pdf | 0 |
7e44eb4f-05a8-4da0-a26a-9e728266cabc | discussed is accelerator availability, determined from sched-
uled operation periods and fault-related downtimes. The
evaluateddatawereusedasaquantitativeinputintherecent
POF-5evaluationprocess(2028-2034),where theyclearly
supported refurbishment and consolidation needs at GSI.
Atechnicalroadmapwasestablishedthisyearto... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6127.pdf | 0 |
4e6da215-480b-47c0-b284-f39eb637e8bd | time for experiments must be balanced against shutdown
periods required for upgrade [ 1] and maintenance activities
This paper presents a quantitative analysisof operational
statistics from 2012 to 2025 based on beamtime records
and operational logbook (OLOG [ 2]) fault annotations. The
goalistoidentifykeyreliabilitytr... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6127.pdf | 0 |
961fdb53-8b4e-4811-ae4a-1202aa2cb653 | the injector chain.
•SIS18 – main synchrotron providing beam for down-
stream rings and experiments.
•ESR – experimental storage ring with electron and
stochastic beam cooling.
•CRYRING@ESR – low-energy storage ring with elec-
tron beam cooling.
•HEST – transfer and extraction beamline systems link-
ing synchrotron,sto... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6127.pdf | 0 |
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