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4486777b-1276-4112-8af8-345a8b6731d1 | 17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6074
2726 MC6.T03: Beam Diagnostics and InstrumentationWEP6074 WEP: Poster session
Content from this work may be used under the terms of the CC BY 4.0 licence (©... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6074.pdf | 3 |
b1bc5709-bca9-4671-bac3-3ab690a9588b | THE QUADRUPOLAR COMPONENT OF THE ESS LINAC PROTON BEAM
B. Bolling∗, N. Milas, European Spallation Source, Lund, Sweden
J. Cederkäll, B. Meirose, Department of Physics, Lund University, Lund, Sweden
Abstract
BeamPositionandPhaseMonitors(BPMs)areusedas
part of normal routines to measure the dipole component
of a charged ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 0 |
ff8cbd90-7168-420c-a258-4b56db37a172 | sis on the relation between pickup sensitivities and beam
parameters,andacalibrationstrategybasedonmeasuring
thequadrupolarsignalsensitivitywithrespecttothebeam
centroid position.
INTRODUCTION
BPMsconstituteafundamentaldiagnostictoolinparticle
accelerators,providinginformationonthedipolecomponent
ofthebeamtodetermineit... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 0 |
a1cf174f-a2b8-4b02-9cab-be57f9a8a3c6 | opportunity to exploit quadrupolar BPM signals for high-
power proton beams. This paper develops the theoretical
basis for quadrupolar signal formation, proposes a method-
ology for calibration and validation, and outlines a mea-
surementstrategyatESSusingBPMs. Figure 1illustrates
the design of the BPMs in the Spoke (S... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 0 |
601890f3-21be-409c-be08-8626d69b99a7 | quadrupole doublet.
The quadrupolar component is defined as
Ξ = 𝜎2𝑥−𝜎2𝑦+ ̄ 𝑥2− ̄ 𝑦2, (1)
∗benjamin.bolling@ess.eu
Figure 1: SPK and elliptical (MBL, HBL, HEBT) LWU
sections’ BPM design (left) and a SPK BPM photograph
(right).
where𝜎𝑥and𝜎𝑦arethermsbeamsizesinthetwotransverse
planes, and ( ̄ 𝑥, ̄ 𝑦)are the be... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 0 |
e5f8df52-4768-4140-a907-d85ce9b44779 | Δ𝑥=𝑈𝐿−𝑈𝑅
𝑈𝐿+𝑈𝑅, Δ 𝑦=𝑈𝑇−𝑈𝐵
𝑈𝑇+𝑈𝐵.(3)
Duetotheunavailabilityduringthetimeofstudyofbeam
invasivediagnosticinstrumentstodirectlymeasurethebeam
profileatgivenlocations,thesensitivities 𝑆𝑄werecalculated
based on BPM design parameters and through calibration.
CALIBRATION AND DATA ANALYSIS
Thecharacterizati... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 0 |
3e6f47b8-5d3e-454a-a2fd-8723a7e828b8 | ally resulted in scans performed with a non-zero offset in
the non-scanning plane (e.g., a vertical offset ̄ 𝑦0during a
horizontalscan). Thisoffsetintroducesaparasiticshiftin
the signal baseline. To recover the real geometric response,
acorrectionprotocolwasimplementedto”align”thedata17th International Particle Accele... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 0 |
878e2423-85be-493e-bad1-e53b0db4206e | Figure 2: Calibration surfacesforselected BPMs
points utilizing a fitting as a function of both the horizontal
and vertical offset, i.e.,
ΞΔ/Σ= 𝑆𝑄( ̄ 𝑥2− ̄ 𝑦2)+𝑐 (4)
where𝑐 = 𝑆𝑄(𝜎2𝑥−𝜎2𝑦)is considered to be constant.
To visualize the fitting, two-dimensional surface fits of
the quadrupole signal were employe... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 1 |
afc62419-7b79-489d-b61f-40c03322bed5 | (SPK) and Medium-Beta (MBL) sections, accurately re-
flecting the mechanical increase in beam pipe radius. Fur-
thermore, the symmetry between horizontal and vertical
extractions validates the geometric integrity of the BPM
pick-up electrodes. Analysis of the fit coefficients reveals
high consistency across the linac s... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 1 |
c6f3571a-03ce-4fee-ab32-e92b95613121 | MBL 30.8 7.87 +/- 0.3 3.61 +/- 0.2
HBL 30.8 8.14 +/- 0.3 0.929 +/- 0.3
that the calibration is able to capture the mechanical scaling
of the BPMs in the physical machine. This provides high
confidence in the transfer of the calibration values to the
analysisofthequadrupolarcomponentofthebeamutilizing
the BPMs in the HE... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 1 |
91435905-0a26-4967-93a4-b4cc675b9614 | and with no energy dependency given that the same results
wereobtainedwithboththe90MeVandthe800MeVbeam.
As the BPMs in the MBL, HBL and HEBT sections have
identicalmechanicalgeometry,MBLcalibrationresultsas
definedinTable 1weretransferredandimplementedaspart
of the analysis of the measurement results in order to de-
ri... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 1 |
c619901b-0bab-486d-88a0-ec60fcb7ec4e | confirms the localized nature of the beam envelope modula-
tion, with high-amplitude oscillations observed downstream
oftheperturbationsourceprovidingabenchmarkforthelat-
ticephaseadvanceandhenceallowsfordetectionofgradient
scaling errors in individual magnets’ magnetic fields.
MODEL COMPARISON
Toevaluatetheaccuracyofe... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 1 |
b507611e-d6ac-47c9-9098-c9df978fdb18 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6075
2728 MC6.T03: Beam Diagnostics and InstrumentationWEP6075 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\WEP6075.pdf | 1 |
0ebb416c-d814-43ca-9b99-479aeb41f83d | Figure 3: Perturbation of a QH and QV pair situated in the HEBT-080 LWU (with the blue and red dotted lines annotating
their respective location) and the resulting BPM responses. The top plots shows the beam quadrupolar component for
the”Golden”setting(greenline)andperturbationsintheotherlines,whilstthebottomplotsshows... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 2 |
60e394c4-4c01-48da-99d9-2816b99809e3 | parisonrevealsthatthereisadiscrepancybetweenthemodel
andthemeasurementpriorandfollowingthelocationofthe
perturbation attributed to initial beam mismatch, including
unknown Twiss parameters at the HEBT section entrance.
AnalysisofthebottomplotsofFig. 3,i.e.,the”Offsetfrom
Golden”, the parasitic effects of the mismatched... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 2 |
45a510ae-6d2a-4bb7-a68d-f60cad0fd4d0 | beam quadrupolar component using the standard BPM sys-
temattheESSSCL.Theimplementationofa2Dsurface-
fitting calibration decoupled geometric sensitivies from par-
asitic beam drifts, establishing calibration factors that scaleaccuratelywiththemechanicalapertureoftheBPMspecies
included in the study.
While the ”Offset fr... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 2 |
eae10c47-9ec0-44c0-9ab6-fd01ec9f5f5b | physicalmachine. Thesedifferencessuggestthatthestudy
iscurrentlylimitedbyuncertaintiesintheinitialbeamdis-
tribution and potential systematic offsets in the absolute
normalization of the quadrupolar signal.
Futureworkincludesimprovingthequalitativeanalysis
followed by
•Furthertests: Requiredinorderto understandthedis-
... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 2 |
d82c3d00-7f1b-4d08-919d-51fdf2757468 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6075
MC6.T03: Beam Diagnostics and Instrumentation 2729WEP: Poster session WEP6075
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\WEP6075.pdf | 2 |
e84a7f23-f167-4850-a194-70ce47dddabd | ACKNOWLEDGMENTS
The authors would like to thank R. Baron (ESS Beam
DiagnosticsGroup)forprovidingthetechnicaldesignspeci-
ficationsandmechanicalsensitivityconstantsforthevarious
BPMspeciesatESS,aswellasthediagnostichardwareil-
lustrations. We especially appreciate their continuous avail-
ability for technical discussion... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 3 |
66858373-ecb3-4002-9558-828861533793 | [3]D. Alves, M. G, and T. Lefèvre, “Analysis of Quadrupolar
Measurements for Beam Size Determination in the LHC”,
inProc. IBIC’19 , Malmö, Sweden, Sep. 2019, pp. 397–401,
2019. doi:1/zero.alt4.18429/JACoW-IBIC2/zero.alt419-TUPP/zero.alt434
[4]OpenXAL Collaboration, “Openxal: an open source accelera-
torphysicssoftwarep... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6075.pdf | 3 |
3ec7ab8a-3de7-4b2d-a10c-f376e1ebda84 | OFF-RESONANCE LANDAU CAVITY FIELD PROBE CALIBRATION
D. K. Olsson∗, Å. Andersson, MAX IV Laboratory, Lund, Sweden
Abstract
Higher harmonic RF cavities are used by synchrotron
lightsourcesforlengtheningthebunchesinordertoimprove
Touschek lifetime and increase incoherent synchrotron tune
spread. The MAX IV 1.5GeVstorage r... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 0 |
b2b3d054-df22-4ee5-8dab-6ee875c8dcef | methodislessdependentontheaccuracyofthemodelshunt
impedance.
THE MAX IV 1.5 GEV STORAGE RING
TheMAXIVlaboratoryhousestwoelectronstoragerings,
the1.5GeVstoragering,andthe 3GeVstoragering. This
paper will only treat the 1.5GeVring. Relevant parame-
ters for this ring can be found in Tab. 1. The ring has two
nominallyiden... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 0 |
4f1611ef-bbea-46c8-ac8a-1f4dde370c58 | current, and 𝑅𝑠is the cavity shunt impedance.
The probe loop calibration of the cavitycan be found by
recordingtheprobeloopvoltageatanumberofcurrentsand
fittingalinearfunctiontotheprobeloopvoltagevs. beam
current. In the case of the passiveLandau cavitiesat MAX
IV,𝑅𝑠/𝑄is found using Superfish [ 3], from which 𝑅𝑠... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 0 |
1c664568-3491-4772-bcbf-63593d93f467 | OFF-RESONANCE CALIBRATION
An alternative to the on-resonance probe loop calibra-
tion is the off-resonance calibration. This method relies
onapproximatingthetotalharmoniccavityfieldas asmall
perturbation to the main cavity accelerating voltage and cal-
culatingtheeffectthisperturbationhasonthesynchrotron
frequency. Thi... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 0 |
31cf01f4-774d-490a-b6d3-9059f3e873bf | and𝑛passive harmonic cavities is
𝑉𝑅𝐹(𝜑) = 𝑉𝑀𝐶(𝜑)+∑
𝑛𝑉𝐻𝐶,𝑛(𝜑). (4)
The main cavity voltage is given by
𝑉𝑀𝐶(𝜑) = 𝑉𝑀𝐶0sin(𝜑+𝜑𝑠), (5)
where𝜑𝑠is the synchronous phase, given by
𝜑𝑠= 𝜋−arcsin(𝑈𝑡𝑜𝑡𝑎𝑙
𝑒𝑉𝑀𝐶0). (6)
Similarly, the harmonic cavity voltage is given by [ 2]
𝑉𝐻𝐶,𝑛(𝜑) = 𝑉𝐻... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 0 |
1ad3f722-cc42-4cf9-b403-17f0bb385f20 | harmonicofthemaincavityfrequency, 𝜔𝑅𝐹,normalisedby
the DC component [ 2]:
̃𝐹 = |̃𝐹|𝑒𝑖𝜑𝐹𝐹=ℱ[𝜌(𝜑)]𝜔=𝑁𝜔 𝑅𝐹
|ℱ[𝜌(𝜑)]𝜔=0|. (9)
Theequilibriumbunchdensitydistributioncanbeexpressed
as
𝜌(𝜑) ∝exp(𝑈(𝜑)
𝐸0ℎ𝛼𝜎2
𝐸2𝜋), (10)
where𝐸0isthebeamenergy, ℎistheharmonicnumber, 𝛼is
the momentum compaction fact... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 1 |
fc129184-f4d1-4c06-bae2-4be399e16039 | thefollowingproportionalityofthesynchrotronfrequency
holds [6]
𝑓2𝑠∝d𝑉𝑅𝐹
d𝜑∣
𝜑𝑠. (13)
Assuming one well-known synchrotron frequency, 𝑓𝑠0,
andcorrespondingacceleratingvoltagegradientevaluated
around the synchronous phased𝑉𝑅𝐹,0
d𝜑|𝜑𝑠, it is possible to
calculatethesynchrotronfrequencyofaperturbedvoltage
gr... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 1 |
aef0c953-1cc8-4564-83cc-a58f730d4957 | suredsynchrotronfrequency, 𝑓𝑠,𝑚𝑒𝑎𝑠,toproducearesidual
function𝑔(∑
𝑛𝑉𝐻𝐶0) = (𝑓𝑠,𝑚𝑒𝑎𝑠−𝑓𝑠,1(∑
𝑛𝑉𝐻𝐶0))2.(15)
Forameasuredsynchrotronfrequency,thetotalharmonic
cavity voltage can be found as the voltage which minimises
Eq. (15).
Measurement
The probe loop calibration factor was found by recording
the ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 1 |
f84235b0-3e2d-4f8e-a0c7-65672669d0b4 | to the limited power of this feedback system, the maximum
measurement current was 100mA, compared to the normal
operational current of 500mA.
Theoff-resonancecalibrationmethodisonlyabletomea-
sure the total effective probe loop calibration of both har-
moniccavitiesinthering. Thisresultsintheeffectiveprobe
loop calibra... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 1 |
164c9bf2-9d61-49ab-8421-b001dfaa2bab | ing calculated harmonic cavity voltagevsthe sum of probe
loopvoltagescanbeseeninFig. 1. Thismeasurementcor-
respondstoanapproximatelyequalsignalamplitudefrom
the probe loops of the two harmonic cavities.
Inordertofindtheindividualprobeloopcalibrationfactor
ofeachcavity,twoadditionalmeasurementsweredone. The
ratio of Ca... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 1 |
17a8fde1-b12b-4d0f-92de-7b0362d91956 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6076
2732 MC6.T03: Beam Diagnostics and InstrumentationWEP6076 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\WEP6076.pdf | 1 |
4fbadd46-838e-403c-a9ee-124c34f7a90e | 0 10 20 30 40 50 60 70-1-0.500.511.522.5104
66006700680069007000710072007300Figure1: The measured 𝑓𝑠andcalculated ∑𝑛𝑉𝐻𝐶,𝑛vsthe
sum of harmonic cavity probe loop voltage. The fields in
Cavity A and B were approximately equal.
0 20 40 60 80 100-2-101234104
550060006500700075008000
Figure2: The measured 𝑓𝑠andcalc... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 2 |
33b83258-8d75-4e0e-95a1-5170d5d7d643 | CF [V/mV] 95 % CI
𝐾𝑎 227.2 [211.8, 242.6]
𝐾𝑏 389.4 [370.6, 408.2]
𝐾𝑎,𝑜𝑛−𝑟𝑒𝑠 321.5
𝐾𝑏,𝑜𝑛−𝑟𝑒𝑠 406.5
Sensitivity Analysis
The accuracy of the off-resonance probe loop calibration
depends on the accuracy of the know quantities used in thecalculation. Inordertoestimatehowanerrorinavariable
affects the resu... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 2 |
04d2f2f5-335d-4587-abca-3ba286a37576 | loopcalibrationconstantwasfoundtobe 319.1V/mV,CI
95%[293.7,344.4], which is a reduction of 11.9%com-
pared to the on-resonance calibration, 362.2V/mV. This
reductionisinthesamedirectionandorderofmagnitudeas
the one expected from previous measurements of the bunch
profile [5]. The individual calibration factors, calcula... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 2 |
9d08d453-e4bc-4b4e-989b-1b32f9f63918 | is significantly less dependent on an accurate value of 𝑅𝑠,
making it useful in detecting potential errors in a modelled
𝑅𝑠. The method is reliant on an accurate measurement of
𝑓𝑠, which can generally be achieved to sufficient accuracy
(order of 0.1%) by increasing the averaging. Its ability to
findthecalibration... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 2 |
8451787e-6ac4-4304-9a90-a0f4d6e44662 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6076
MC6.T03: Beam Diagnostics and Instrumentation 2733WEP: Poster session WEP6076
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\WEP6076.pdf | 2 |
f4fa30b7-c091-4c3d-8773-4fffe312b407 | [2]P. F. Tavares, Å. Andersson, A. Hansson, and J. Breunlin,
“Equilibriumbunchdensitydistributionwithpassiveharmonic
cavities in a storage ring”, Physical Review Special Topics -
Accelerators and Beams , vol. 17, p. 064401, 2014.
doi:1/zero.alt4.11/zero.alt43/PhysRevSTAB.17./zero.alt4644/zero.alt41
[3]K. Halbach and R.... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 3 |
4227b104-b340-4ba7-9c32-6df41eae9b7b | 2024. doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt424-WEPR42
[6]H.Wiedemann, Particleacceleratorphysics .SpringerInterna-
tional Publishing, 2019.
[7]J.BreunlinandÅ.Andersson,“EmittanceDiagnosticsatthe
MAX IV 3 GeV StorageRing”, in Proceedings of IPAC2016 ,
pp. 2908–2910, 2016.
doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt4... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6076.pdf | 3 |
9bf63d38-9fdf-45ff-ab64-dac796ad23b7 | A NEW ANALOGUE ACQUISITION FOR THE BPM OF CERN PS
M. Bozzolan, European Organization for Nuclear Research, Geneva, Switzerland
Abstract
The bunch- by-bunch and turn- by-turn beam trajectory
measurement system of the CERN PS accelerator has been
in operation for several years. To ensure long- term reliabil-
ity... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 0 |
976ec36f-8006-462c-ba41-fcab90edc5d3 | creased dynamic range opens the possibility of measuring
longer acceleration periods without gain switching and bet-
ter resolution. Increased band width allows the measure-
ment of more beam configuration, in particular with shorter
bunch to bunch distance. However, improved perfor-
mances come at the expense of pla... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 0 |
fc6623e1-bdc0-4aae-b1b3-7fbc20c47330 | stream accelerators (SPS and AD) and to experimental ar-eas [1]. The bunch intensity range is from 5 ·10
9 to ~1013
charges per bunch with a minimum bunch to bunch spacing
of 25ns . A versatile RF system allows complex bunch ma-
nipulations like merging, compression, splitting and rota-
tion.
For the observat... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 0 |
a5f47f7a-8a32-46df-8124-c699e53fbe6d | a signal with amplitude proportional to the centr e of charge
position [2].
Ideally the BPM system should measure the beam posi-
tion of the individual bunches turn by turn, on every beam
configuration and along all the beam cycle from injection
to extraction , following the RF beam manipulations. This
spe... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 0 |
8c43e632-4164-4b36-82d9-a4ff676dfcaf | ally allowing the acquisition of the full accelerating cycle
without using gain switching that may cause the loss of
bunch synchronization.
The system in use can operate without gain switching on
regions of the accelerating cycle (i.e. injection, extraction,
etc.) but with limited performance if setup to acq... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 0 |
0184bd13-8e08-412e-815b-b5eff77dafbc | the system performances [3].
Low I mpedance (Low -Z) Architecture1
In the low impedance case ( below ~1kΩ loading imped-
ance) , like the PS BPM system in operation (Fig. 2) with
200Ω loading impedance , the main advantage is a relative
freedom in the location of the amplifier (e.g. low/free radi-
ation zone ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 0 |
aa4d40fb-ab51-4a8b-86e7-4c22ae3ee803 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6079
MC6.T03: Beam Diagnostics and Instrumentation 2735WEP: Poster session WEP6079
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\WEP6079.pdf | 0 |
1dcca81b-4e33-4ea7-9479-cb3ebd091a14 | The limitation comes from the high pass frequency re-
sponse of the electrode with the cutoff (8MHz in the PS
Low-Z BPM case) de fined by the capacitive source imped-
ance and the resistive component of its load. The high pass
response requires an active compensation to obtain , at the
output of the analogue ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 1 |
c7dab08b-3e13-4a5e-9995-13645d03ff5e | For the consolidation of the PS BPM system a variant of
the high impedance (hundreds of kΩ) architecture has been
chosen to improve the system performance . However, be-
cause a transmission line with impedance higher than few
hundreds ohm is unfeasible, t he “basic ” Hi-Z configuration
requires the amplifier ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 1 |
410bf6cc-5567-4534-b5af-dd686a56d7d6 | bles for the connection (Fig. 3) . The frequency dependent
impedance loading of the electrode is about 100kΩ at low
frequency and 75Ω at high frequency thanks to the AC ter-
mination needed to avoid the long line effect that would
start from about 10MHz , well into the required system
passband.
Figure 3:... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 1 |
37f61f4f-5cf5-4ad5-adc8-8ee0fa57e292 | the capacitive divider formed by the coaxial cable capaci-
tance proportional to the cable length ( plus matching net-
works and electronics input capacitances) and the pickup
capacitance. The simulated time domain response to r aised
cosine pulses of different amplitude 5ns long and 25ns
spaced is also report... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 1 |
9bdc5a65-b15a-444f-9550-17613eb1ebc5 | “White ’s” source follower [4]. Ahead of the buffer stage , a
capacitive divider can be inserted using reed relays to at-tenuate signal of high intensity beams. Downstream of the
buffer stage the hybrid coupler combines the signal s com-
ing from the two opposite electrodes of one plane to pro-
duce the sum and... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 1 |
f673b50c-3e06-4f77-ad39-3a0a79b18fa4 | CERN mixed field radiation facility. JFET s and HBT have
been tested unbiased up to 10kGy, with no impact on the
final application, while a complete frontend has been irra-
diated up to 3kGy without significant variation on the elec-
trical measurements . This result should guarantee a life-
time (considering only... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 1 |
ed85380a-c3c6-4aa3-91aa-9e4100cdf493 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6079
2736 MC6.T03: Beam Diagnostics and InstrumentationWEP6079 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\WEP6079.pdf | 1 |
4aed5963-cfd6-4bdb-b789-34f30c78e068 | plug- out/plug-in and a stock of spare s is foreseen for the
replacement in case of failure. Reparation is also an option,
when the activation of the module is not excessive.
The bench measurements (Fig. 6) are obtained emulating
the final tunnel setup (pickup assembly + 5ns cable +
frontend electronics... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 2 |
8543b0fd-a17d-4eb3-9e15-98a7fe3f599d | Figure 6: Hi-Z frontend electronics frequency response .
BEAM MEASUREMENTS
The effect of the improved electrical performances is
presented comparing a “TOF” high intensity single bunch
proton beam acquired by two identical pickups located
very close each other (~1m apart) in the PS ring . One
pickup is equippe... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 2 |
7c6e7ea9-bac4-4ae2-b496-27b578785ab3 | Dynamic R ange
Since t he PS beam pickup (Fig. 1) has the combined plus
and minus electrodes of each plane providing (almost ) 360
degrees radial coverage the sum signal integrated over the
bunch length is proportional to the bunch intensity and independent on the beam position. The comparison of the
BPM... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 2 |
02148ceb-f7ab-43d6-9c58-64d2c66edcde | (hatched) , while the Low-Z BPM (orange) is affected by
the increasing charge density of the bunch starting at turn
261.3k when bunch rotation is applied .
Position M easurement
Finally, the position measurement (Fig. 9) of the Hi-Z
BPM has better resolution and offset . The Low -Z BPM
trace is affected b... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 2 |
e230ff8f-d78b-4214-acd7-4c0431370f55 | signed frontend electronics is compatible with the radiation level expected on the foreseen amplifier locations .
Three prototype system s are currently installed in the PS
ring to further validate the reliability of the proposed im-
plementation , and the installation is foreseen during the up-
coming long shutdow... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 2 |
93abd7e3-5947-4d68-9829-11bd51583213 | REFERENCES
[1] E. Lopienska, “ The CERN accelerator complex layout in
2022” , CERN 2022 .
https://cds.cern.ch/record/2800984/
[2] A.J. Sherwood , “Electrostatic induction electrode systems for
beam -position detection ”, IEEE Trans. Nucl. Sci. , vol. 12,
no. 3, pp. 925-928, 1965 .
doi: 10.1109/ TNS.1965.432... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6079.pdf | 3 |
1bb691a7-b328-460f-a48d-ac7f45eafe6d | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6079
2738 MC6.T03: Beam Diagnostics and InstrumentationWEP6079 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\WEP6079.pdf | 3 |
7696cf68-9765-4ac8-910b-45a5aff462c0 | NEW FINDINGS ON BPM CALIBRATION IN THE LHC
J. Keintzel∗, M. Krupa, Y. Angelis, J. Dilly, V. Ferrentino, M. Le Garrec,
J. Gray, D. Jacquet, K. Skoufaris, R. Tomás, J. Wenninger
CERN, Geneva, Switzerland
Abstract
Accurate Beam-Position Monitor (BPM) calibration is
essential for high-quality optics measurements and reli-
... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 0 |
5085fb13-ef8f-4e2a-a413-b5a6ddedafe7 | been fully understood. This contribution presents the in-
vestigations that enabled the identification of the bias, open
questions, and implications for future operation.
INTRODUCTION
TheLargeHadronCollider(LHC)[ 1]atCERNwithap-
proximately 27kmcircumferenceiscurrentlyinhislastyear
of operation for Run 3 and achieves b... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 0 |
b9e6434f-b016-4e4b-8a42-98354e6887c5 | jection and top energy of, respectively 450GeVand up to
6.8TeV, taken between 2016 and 2022, with 𝛼𝑐, between
3.2 × 10−4and3.5 × 10−4[3,4]. Additionally, in 2022 a
novel optics with a transverse phase advance of 60∘in the
arc FODO cells, 30% lower compared to the nominal LHC
optics which features roughly 90∘, and has... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 0 |
30bd7a44-5078-49e2-b75d-440948a4df46 | re-analysed in early 2025. Consequently novel polynomials
havebeenappliedatthestartof2025. Withthesenewset-
tingsopticsmeasurementsareacquiredin2025and2026,
at various configurations. Main findings are reported here.
∗jacqueline.keintzel@cern.ch60∘OPTICS MEASUREMENTS IN 2024
A60∘optics has been designed and measured in... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 0 |
5896918f-8250-49a1-b1bb-15f71311832d | performed usingomc3 [ 6]. Foroff-momentum optics mea-
surements, RF-frequency shifts of ±50Hz,±100Hz, and
±150Hzareapplied. Globalopticscorrectionsarebasedon
a response matrices including horizontal and vertical tunes,
phaseadvancesandnormalizedhorizontaldispersion,and
all available quadrupole circuits [ 1]. Correction... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 0 |
878a691d-338b-45e4-8703-7dcc6ab43bed | applyingglobalcorrections,thermshorizontaldispersion
deviation is reduced from 64cmto16cmfor beam 1 and
from66cmto30cmforbeam2. Verticallythermsdisper-
sion is roughly 0.2m. This optics is hence considered to
be sufficiency well corrected to analyse 𝛼𝑐and hence BPM
calibration.
Figure1: Beam1horizontal(top)andvertica... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 0 |
48f6fd2c-ced8-4c7c-8ca8-d40cc3960367 | Figure2: Beam1horizontal(top)andvertical(bottom) 𝛽-
beating before and after applying global corrections.
Similar to [ 3] it is aimed to measure 𝛼𝑐by comparing
therelativemomentumoffsetobtainedfromtheorbitdata
in combination with the model dispersion, with the rel-
ative momentum offset obtained using the RF-frequen... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 1 |
eb7e4d71-9062-4220-8cef-dd8b8e9a96b2 | ItisshowninFig. 3. Theerrorbarreflectsthefittingerror
using a least square fit technique. Since the same system-
atic error is measured for optics measurements at various
machine configurations for both beams it is attributed to an
average arc BPM calibration error.
Figure 3: Measured compared to model 𝛼𝑐for beam 1 (... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 1 |
6d715692-22c7-4e19-95bc-a870aed2b670 | quasi-2DelectrostaticsimulationswithCSTMicrowaveStu-
dio [7]. Upon verification of the 2014 CST model it is
discovered that some of its dimensions do not correspond
tothetruearcBPMdesign,mostnotablytheBPMbutton
electrode was modelled 14% too large. In the typical arc
BPM measurement range of up to ±5mm, this would resu... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 1 |
04bc55d2-d5fa-45dd-aae6-e34958ffe064 | in Fig.4.
Figure 4: Residual beam position measurement errors of
arcBPMsintroducedbythe2014(top)and2025(bottom)
polynomial.
MEASUREMENTS IN 2025 AND 2026
Sincebothindependentanalyses,basedeitheronopticsor
onCSThavefoundasystematicaveragearcBPMcalibration
errorofroughly 2.5−3% ,thenewlyderivedpolynomials,
seealso[8],hav... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 1 |
2ea84d38-c7b0-4456-aaac-408f25e50f88 | Table 1: Relative Deviation Of 𝛼𝑐For Beam 1, Given In %
Date Optics 𝐷𝑥 𝐷𝑥and𝐷(2)𝑥
11/04/25 11 m −3.36±0.40 −3.35±0.87
20/04/25 11 m −3.91±0.23 −3.62±0.17
26/02/26 11 m −3.40±0.38 −3.17±0.35
12/04/25 2 m −0.57±0.25 −0.48±0.21
13/04/25 60 cm −0.71±0.71 −0.09±0.88
13/04/25 1.2 m −0.45±0.30 −1.75±0.11
26/02/26 1.2 ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 2 |
ce2ac1d7-0a46-4d40-8185-4dea9b10e010 | 11/04/25 11 m −3.08±0.68 −2.08±0.74
20/04/25 11 m −3.47±0.33 −2.58±0.11
26/02/26 11 m −3.33±0.46 −2.11±0.74
12/04/25 2 m −0.43±0.16 −0.11±0.22
13/04/25 60 cm −0.64±0.63 −1.43±0.85
13/04/25 1.2 m −0.35±0.37 −0.34±0.49
26/02/26 1.2 m −0.31±0.74 0.10±0.47
DISCUSSION
Whilemeasurements attop energyclearlyreflect theex-
pect... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 2 |
fdc88d91-4559-4d19-8a7b-70a68b34abb9 | ments, compared to injection energy, e.g. 1nscompared to
up1.7nson measurements at 26/02/26, this is not expected
to introduce a significant scaling error in the arc BPM read-
ings. Detailed analysis is still ongoing, however, first results
indicate that the scaling error due to the bunch length varia-
tionisexpectedto... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 2 |
00db95ec-7dc7-43d7-b30a-3a8618db5f6f | which, however, reproduced the findings on 𝛼𝑐.
Second-order Dispersion The relative momentum off-
set from orbit is re-calculated by a least-square fit including
modelhorizontallinearandsecond-orderdispersionandthe
measured horizontal closed-orbit. Results are also given in
Tables1and2. Themeanvaluesare,respectivelyf... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 2 |
72c839dc-a23a-4a56-8d57-9551d6645df4 | analysedmeasurements at top-energythe horizontal action
is smaller by up to roughly one order-of-magnitude as seen
inFig.5. However,obtaining 𝛼𝑐directlyfromorbitreadings
do not show a clear dependence on the action, shown in the
samefigureat √2𝐽𝑥= 0,nevertheless,thisanalysissuggests
that the deviation without kicks... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 2 |
b31bbe74-2b09-4c40-ba5a-10b6ea5fc673 | surementsremainunchanged. Arangeofpossiblesources
hasbeeninvestigatedfrombothbeamdynamicsandbeam
instrumentationperspectives. However,currentlynoclear
source of this discrepancy has been identified.
REFERENCES
[1]O. Brüning et al., “LHC design report”, CERN, Geneva,
Switzerland,Rep.CERN-2004-003-V-1, 2004.17th Internat... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 2 |
439b1f3c-8753-4e9a-a399-3c8560aa6eae | [2]G.Apollinari,I.BéjarAlonso,O.Brüning,P.Fessia,M.La-
mont, L. Rossiand L. Tavian, Eds., “High-Luminosity Large
Hadron Collider (HL-LHC): technical design report V.0.1”,
CERN, Geneva, Switzerland, Rep. CERN-2017-007-M, 2017.
[3]J.Keintzel,L.MalinaandR.Tomás,“Momentumcompaction
factormeasurementsintheLargeHadronCollide... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 3 |
bfee468d-7eb0-437e-8907-d9c3f6ff3695 | in the Large Hadron Collider at CERN”, in Proc. IPAC’23 ,Venice, Italy, May 2023, pp. 571–574.
doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt423-MOPL/zero.alt426
[6]L. Malina etal., “OMC3”, Zenodo, 2022.
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[7]CSTMicrowaveStudio, CST Studio Suite , 2026.
[8]M.Krupa,“Geometricalnon-... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6080.pdf | 3 |
2869358b-29cd-4760-9f6a-dca83bc433ee | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6080
2742 MC6.T03: Beam Diagnostics and InstrumentationWEP6080 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\WEP6080.pdf | 3 |
919c202a-d82a-4bd4-b868-aeb965e61931 | ADVANCING BEAM QUALITY CONTROL
IN THE CERN PROTON SYNCHROTRON
M. Coly, A. Akroh, Z. Ansari, A. Beeckman, D. Cotte, J. Flowerdew, G. Imesch, A. Huschauer,
A. Lasheen, R. Maillet, J. Mccarthy, K. Sabin, S. Sainz Pérez, M. Schenk, Y. Wu
CERN, Geneva, Switzerland
Abstract
Over the past years, the beam quality delivered by ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 0 |
ae49c08d-64a1-4609-aa9c-42d386c80b06 | To address these challenges, a new beam quality moni-
toring framework has been developed, building on recent
enhancementsindataacquisitionandonlineanalysiscapa-
bilities. Thesystemdefineskeybeamqualitymetricsinreal
time,enablingearlydetectionofdrifts,root-causefaultanal-
ysis, and provides the foundation for automated... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 0 |
7d0aa82c-0580-4beb-8c2a-928dd7f9a001 | of CERN’s experimental program.
INTRODUCTION
The CERN Proton Synchrotron (PS) is part of the CERN
injectorchainprovidingbeamsbothforfixed-targetexper-
imentsandfordownstreamacceleratorssuchastheSuper
Proton Synchrotron (SPS) and the Large Hadron Collider
(LHC). The PS must deliver beams with a wide range of
intensities... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 0 |
1695c917-e967-4884-843f-f4581f743c18 | indicators of beam quality.
Figure1: ConceptualarchitectureoftheBQMframework.
Signalsfrom beam instrumentation,notablyBeam Current
Transformers(BCT),WallCurrentMonitors(WCM),and
Low-LevelRadioFrequency(LLRF)systems,areprocessed
onlinetoderivebeamqualitymetricsforseveraloperational
purposes.
BEAM QUALITY MONITORING
FRAM... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 0 |
d78bd1f3-9c6b-4e42-af19-260fd2a31de8 | intheCERNControlCentre(CCC)supportingbothroutine
operation and machine development studies.
BQM USE CASES IN PS OPERATION
Tohelptheoperationsteam,BQMmetricsareexposedin
differentways,dependingonoperationalneedsandusecases.
The following subsections present representative examples.
Machine-Learning Tools: MTE Efficiency... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 0 |
5e4cd837-b245-4e39-a2a3-7e666731ffb2 | splitting efficiency, is defined as the average intensity in the
islands divided by the total intensity:
𝜂MTE= ⟨𝐼islands⟩/𝐼total. (1)
In case of quality drifts, the operations team can use a
machine-learning-basedoptimisationalgorithmtoadjustPS17th International Particle Accelerator Conference, Deauville, France JAC... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 0 |
ebb9b326-0029-443f-aeb4-c7f674581a5d | Figure2: SignalacquiredfromaBCTinthePSdownstream
transfer line, from which the intensities of the five MTE
beamlets are measured over time. The core is greyed out
in the figure. The blue trace corresponds to a balanced
intensitydistributionacrossthefivebeamlets,yieldingan
optimal splitting efficiency of 0.2, whereas th... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 1 |
1b0084c0-bd13-41fc-8c7c-56383758d2f6 | feedback (CBFB) system. As described in Ref. [ 3], the
CBFB acquisition system provides measurements of the
longitudinal beam behaviour at different harmonics in the
formofin-phase( 𝐼)andquadrature( 𝑄)components,from
whichtheamplitudeofthecoupled-bunchmodesignalMis
obtained as:
𝑀(𝑡) =√𝐼(𝑡)2+𝑄(𝑡)2. (2)
For each ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 1 |
fea2670d-51a6-482b-9439-c54011ef12eb | Luminosity(HL)-LHCReliabilityRun[ 4],allowingrapid
identificationofdipolarcoupled-bunchactivity. Thederived
observableis then published through the control systemand
monitored in an operational GUI shown in Fig. 4.
Figure3: RepresentativeCBFBdiagnostics. Thefirstrow
correspondstoastablebeam,whilethesecondrowshows
an un... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 1 |
081e45ce-dddc-45a6-b3c1-e2cbc296fb2d | arevisiblethroughoutthecontrolroom. Theircontentisalso
distributed via a CERN-wide video stream, allowingteams
in the experimental areas to follow machine status in real
time. One of these displays is dedicated to the performance
of LHC-type beams in the PS, in particular bunch-by-bunch
intensity and bunch length (see ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 1 |
98454f59-b90d-4baa-938b-54bcf6bc423e | represents the linear baseline.
Thefitisusedtoextracttheintensityandlengthofeach
bunch. These observables are required to remain stable
over time and as uniform as possible across all bunches
withinthetraininordertomaintainabalancedbunchpattern,
which is particularly challenging for high-brightness beams.
Displayingthe... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 1 |
6c84e88a-d093-4bb3-a410-239be41cb8cb | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6081
2744 MC6.T03: Beam Diagnostics and InstrumentationWEP6081 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\WEP6081.pdf | 1 |
2e17f4b6-f761-4f8b-abfa-407a92b66f1e | Figure4: OperationalBQMinterfaceusedintheCCC.Beam
quality indicators are colour-coded according to predefined
thresholds (green: nominal, yellow: warning, red: fault).
usedtomeasurethetransversebeamprofile,fromwhichthe
BQM derives the horizontal and vertical beam sizes 𝜎hor
and𝜎ver. Thebeamintensity(I)ismeasuredbyaBC... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 2 |
abcb9be5-4b93-4ed1-934d-4230547c9fba | INTERFACE
The application-oriented metrics, forming a subset of the
broader BQM metrics, are integrated into an operational
interface used in the CCC, shown in Fig. 4. The interface
provides a compact overview of critical metrics for each
beamtype,includingMTEefficiency,CBFBinstabilityin-
dicators, longitudinal splitti... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 2 |
01f976a3-fd23-439a-8189-9a6d71371d46 | areeasilyadjustableviaconfigurationfiles,makingtheGUI
adaptive to varying operational requirements.
This unified overview allows operators to react quickly
incaseofdrifts,correlatedegradationsacrosssubsystems,
and supports reliability runs with consistent beam-quality
supervision.
CONCLUSION
A BQM framework has been de... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 2 |
cfa917d0-b6fb-4c10-b198-bae7e90c4361 | The system combines beam instrumentation data with
online analysisalgorithms to derivecompact indicators de-
scribingbeambehaviour. Theresultingapplication-oriented
metric set supports, for example, machine-learning opti-
misation of MTE, GUI-based CBFB diagnostics, VISTAR
monitoring of longitudinal splitting, and beam... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 2 |
91739de5-7dd9-4100-95e8-eb3c5fa9664f | future automation efforts, as it is building a comprehensive
databaseformachinelearning,enablingadvancedpredictive
analytics and optimization of operational processes.
In the future, the approach could be extended to other
CERN accelerators and enriched with additional observ-
ables, such as transverse emittance measur... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 2 |
a367ba58-ca55-4508-a6a4-f6a12c57c9a1 | multi-turnextractiontuningattheCERNProtonSynchrotron”,
inProc. IPAC’25 , Taipei, Taiwan, Jun. 2025, pp. 2703–2706.
doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt425-THPM/zero.alt4/zero.alt49
[3]H. Damerau et al., “Longitudinal Coupled-Bunch Instabilities
in the CERNPS”, in Proc.PAC’07 , Albuquerque,NM, USA,
Jun. 2007, pape... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 2 |
fadbb118-7533-4a30-88b6-24b95a8c8c1d | [4]Sainzet al., “Results from the HL-LHC proton Reliability
RunintheLHCinjectors”,presentedatIPAC’26,Deauville,
France, May 2026, paper THP4009, this conference.
[5]A. Beeckman et al., “Real-time Monitoring of Longitudinal
BeamQuality across theCERN AcceleratorComplex,” Nucl.
Instrum. Methods Phys. Res. A , vol. 1086, ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 3 |
d00cde17-4dcf-4ead-974b-bccba049d81f | terlocking System: A Modular Operator-Driven
Approach to Equipment and Beam Quality Su-
pervision,” presented at WAO 2025 . Available at:
https://event.fourwaves.com/wao2/zero.alt425/abstracts/
5ebb76/zero.alt4e-65be-493/zero.alt4-b9c6-1ceabb9f/zero.alt439f .17th International Particle Accelerator Conference, Deauville... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6081.pdf | 3 |
e5f47fa0-e348-4e71-955b-e55f80967a0b | STUDYING COHERENT TRANSITION RADIATION SPATIAL IMAGE
FEATURES FOR BUNCH LENGTH DIAGNOSTICS
A. Guisao-Betancur∗1,2, C. P. Welsch1,2, J. Wolfenden†1,2
1University of Liverpool, Liverpool, UK
2Cockcroft Institute, Daresbury, UK
Abstract
Coherenttransitionradiation(CTR)hasbeenwidelyused
fordevelopingdiagnosticsofparticlebe... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6087.pdf | 0 |
801d6afd-1f5a-44c0-8dc0-f9b80110a6c6 | such as the image width, can be tied to the bunch length.
However,amorein-depthimageanalysisisrequired. Inthis
work,anattemptismadetomodelsomeofthebunchprofile
features from the CTR spatial images using conventional
imageanddataanalysistechniques. TheCTRspatialimages
aresimulatedinAnsysZemaxOpticStudioforabroadrange
of... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6087.pdf | 0 |
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