id stringlengths 36 36 | text stringlengths 1 1k | source stringlengths 42 191 | page int64 0 1.03k |
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b3a2105c-4294-4985-b061-305b66729551 | the population of the particles.
Figure 3: Coordinates of the l oss along the ring (top) , per-
centage of losses as a function of bunch number (bottom) .
Figure 3 (bottom) indicates that the kick angle for the first
~200 bunches is small enough that they survive to the sec-
ond turn , eventually being lost... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6138.pdf | 1 |
827af979-e3dd-4d12-aaf0-9c00c4c4b37a | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6138
2856 MC6.T23: Machine ProtectionWEP6138 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, publ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6138.pdf | 1 |
53040b4c-e6d6-41d9-9665-80401f044c5c | DEPOSITED ENERGY
One of the main goals of the design was to ensure the
energy density deposited in the beam dumps and collima-
tors remained below the melting point for copper. For this
study, this has been taken to be 3.5 kJ/cm3, similar to the
value used for SLS 2.0 [3]. To determine if this threshold
is likel... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6138.pdf | 2 |
df1512fb-05c4-4838-9cc1-cc8cd73944c1 | was chosen to correspond to the electron bunch size in the
relevant component. For the BD , the horizontal and verti-
cal beam sizes are 30 µm and 4 µm respectively , and in the
collimator s they are 67 µm and 7.2 µm. The total deposited
energy per electron is shown in Fig. 6 for each location .
The energy de... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6138.pdf | 2 |
93188f97-2aab-46e1-8f8d-9a9627e8a34d | vertical (bottom right ) collimator models used in BDSIM.
CONCLUSIONS
Initial studies for a beam abort system for Diamond -II
have been completed. An outline specification has been de-
veloped, detailing how the system should respond to vari-ous types of beam loss mechanism. Requirements on the individual compon... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6138.pdf | 2 |
2e457a4c-dfea-40d6-a5d5-0f3a62d27b86 | Figure 7: Energy density along beam dump (top) and col-
limator (bottom).
17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6138
MC6.T23: Machine Protection 2857WEP: Poster session WEP6138
Content from this wo... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6138.pdf | 2 |
4c523edc-1999-4c21-86dd-975f4d8dccfb | REFERENCES
[1] R.P Walker et al., “ Diamond -II Technical Design Report ”,
August 2022 ,
https://www.diamond.ac.uk/Diamond- II.html
[2] M. Borland, “Elegant: a flexible sdds -compliant code for ac-
celerator simulation ”, Advanced Photon Source, Argonne
National Laboratory, USA, Report No. LS -287 (2000) .
[3] ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6138.pdf | 3 |
7739eed9-a313-49a9-a25c-e6724ece9852 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6138
2858 MC6.T23: Machine ProtectionWEP6138 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, publ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6138.pdf | 3 |
97d0c430-5310-4f04-94e8-d3fd33bd3d36 | INTEGRATING FAST BEAM INTERLOCKS INTO AN EVENT -BASED
TIMING SYSTEM
L. Perusko†, A. Debenjak, Z. Oven, T. Zagar, Cosylab, Ljubljana, Slovenia
E. J. Harms, L. Szeto, Nusano, Salt Lake City, USA
J. Ringuette *, TerraPower , Bellevue, USA
Abstract
Accelerators often use separate infrastructures for pre-
c... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 0 |
a6799d85-49b3-49c7-b0be-d961170c95bf | low-latency interlock information. With timing and protec-
tion combined, interlock conditions can act immediately on timing outputs while established capabilities such as se-
quences, delay compensation and timestamping remain
fully supported. The system offer s flexible configuration of
inputs, flags and outputs, a... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 0 |
f951681d-9522-428c-9dcc-278122da59ec | jitter and deterministic latency across all endpoints.
An event -based timing system addresses these require-
ments by distributing a common synchronous clock from a
central Event Master (EVM) to a set of Event Receivers
(EVRs) over dedicated fiber -optic links. On each clock cy-
cle the EVM may encode an event co... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 0 |
e303d91f-6180-4cbc-aff9-d2e0f678ebf2 | tion subsystem, which corrects for the residual cable -
length differences.
MRF timing system
One of the established commercial providers of event -
based timing systems is Micro -Research Finland (MRF) [1]. MRF equipment has been deployed at numer-
ous institutes and accelerator facilities over the past two
dec... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 0 |
510aefd4-dae3-461a-8565-b876f4fd51f2 | to all EVRs, the data slot of the serial link also supports
upstream data transfer from each EVR back towards the
EVM. This upstream path, normally used for delay com-
pensation measurements and data buffers, is the foundation on which the interlock extension is built.
For the Nusano linac , the timing system cons... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 0 |
4e566a61-4c13-4aa9-8b57-5e2cd7170a2e | synchronizes timestamps across the entire timing system .
Figure 1: Topology of the Nusano Timing System.
INTERLOCK EXTENSION
Requirements
The Nusano linac requires both a Beam Permit (BP) sys-
tem, which monitors device readiness and inhibits opera-
tion while any subsystem is not ready, and a Fast Beam In-
t... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 0 |
ec97873f-6676-4b96-a40d-55ded38cd3c7 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6140
MC6.T24: Instrumentation: Timing and Synchronization 2859WEP: Poster session WEP6140
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)... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 0 |
c85d99e4-92c2-4338-a1ed-cfc4c0cbc748 | functionality directly in the FPGA gateware of the existing
MRF timing boards.
The key requirements driving the design are:
• End-to-end latency: the propagation time from any
physical interlock input to any affected timing output
must not exceed 30 µs across the full two -hop topol-
ogy.
• Fail-safe communi... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 1 |
9557cec1-e9b1-4637-8d01-ccebd5835931 | • Input conditioning: p er-input configurable debounce
time to reject glitches without introducing unneces-sary latency.
• Timestamped logging: every change of a BP/FBI in-
put or output gate is logged with a hardware
timestamp synchronized to the MRF event clock, en-
abling post -mortem analysis.
• Postmortem... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 1 |
6911e85e-2f19-4d67-8913-40807a8e60cf | together with a checksum that protects the payload against
transmission errors. The transmitter sends these messages at regular intervals, and the receiver expects a fresh, valid
message within a fixed time window; if the message is late,
missi ng, or fails the checksum, the receiver raises a com-
munication error... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 1 |
e861ca51-d6f5-4eb3-bce7-928b332c0c68 | tribution but does not share its delay- compensation logic:
timing events are still aligned across the facility as before,
while flags follow their own dedicated, b ounded -latency
path optimized for fast fault response.
On each EVR the physical inputs (typically dry contacts
or logic signals from subsystem rea... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 1 |
ff97ac86-04e0-4c2f-ab2f-ca42576ca68a | sage and sent to the EVM.
The EVM aggregates the flag messages from all con-
nected EVRs into a unified peride view: a global flag re-
mains OK only while every EVR reports it as OK, so a sin-
gle fault anywhere in the system is enough to drive the cor-
responding global flag into the fault state.
At the EVM ma... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 1 |
a4bb379c-b633-4caa-bd54-02b40f6026af | Each EVR receives the downstream flag message and
uses a second user -configurable mapping to decide how the
system -wide flags affect its outputs. A timing output con-
figured as an interlock- gated output is held in its idle state
whenever any flag assigned to it is in the fault state, block-
ing the trigger pu... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 1 |
8e8111d1-c7b6-43b3-b827-27d76d07c35c | standard MRF user -event mechanism, so up to eight timing
event codes can be pre -armed to fire together in response
to a fault . Because these events travel through the standard
MRF event distribution path they arrive synchronously at every EVR in the system, timestamped with event cycle
precision, providing a co... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 1 |
5753334c-39ee-4359-a96d-a9e436a49d25 | their highest rate, end -to-end measurements from input as-
sertion to output response confirmed that this delay stays
well within the required 30 µs.
SOFTWARE INTEGRATION
The EPICS control framework [3] is used throughout the
Nusano control system. The timing application extends the open -source mrfioc2 EPICS ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 1 |
2f799707-7e6f-4095-b795-2cdb01a67c1f | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6140
2860 MC6.T24: Instrumentation: Timing and SynchronizationWEP6140 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)... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 1 |
7cc4d10f-c392-4734-abef-90d08d64d204 | databases handle timing sequences, delay compensation
and timestamping; new gateware databases cover fail -safe
communication status and configuration, flag state read-backs, input- to-flag and flag -to-output mapping as show on
Fig. 2 , per-input debounce time, and logging. Template in-
stantiation at IOC build ti... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 2 |
8a5d62de-9f8b-4b12-acbc-d1e8c94a2fc3 | lated between EVRs without post- processing, and is ac-
companied by a snapshot of the input and output states at
that instant as show n in Fig. 3. The IOC reads entries out
of the on- board buffer as soon as the gateware signals that
new data is available. Should the buffer fill faster than soft-
ware can drai... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 2 |
87a1349d-6fc1-458b-9a98-0bf92b6128f4 | All configurable parameters ( mapping matrices, de-
bounce times, flag modes, postmortem enables, communi-cation periods ) carry autosave annotations so that the IOC
restores the previous configuration automatically on re-
boot.
Operator interfaces are implemented in CS -Studio Phoe-
bus [5]. A hardware overview scr... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 2 |
76c0a771-9620-49d3-91bc-f93f54236811 | gle interface rather than switching between separate timing
and interlock systems.
STATUS
The system described here is currently being deployed at
the Nusano Production facility in West Valley City, Utah. Site acceptance testing has been completed with all distrib-uted timing units installed. End users are curren... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 2 |
02e1f55e-c271-415f-8c92-664ef6bdf2a9 | tor that integrates fast beam interlock functionality into an
existing MRF event -based timing system without addi-
tional hardware or dedicated interl ock cabling. A fail -safe
communication protocol layered onto the existing MRF se-rial links carries BP/FBI flag information with end -to-end
latency validated below... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 2 |
e4344d38-a8dc-4fe8-9d34-b185f8f60f0a | vice synchronization and machine protection is required.
REFERE NCES
[1] Micro -Research Finland Oy , http://www.mrf.fi
[2] T. Walter, F. Ludwig, K. Rehlich, and H. Schlarb, “Novel
Crate Standard MTCA.4 for Industry and Research”, in Proc.
IP AC'13, Shanghai, China, May 2013, paper THPWA003, pp.
3633-3635.
[3... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 2 |
b8287804-c1e0-4d1d-8f1c-f233d975fbe7 | 17th International Particle Accelerator Conference, Deauville, France JACoW Publishing
ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6140
MC6.T24: Instrumentation: Timing and Synchronization 2861WEP: Poster session WEP6140
Content from this work may be used under the terms of the CC BY 4.0 lic... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6140.pdf | 2 |
72862748-388a-4544-8dc2-f9489b15fe71 | MODIFICATION OF THE TRANSVERSE ELECTRON BUNCH PROFILE
WITH SPATIAL LIGHT MODULATOR AT FLUTE
T. Schmelzer∗, M. Brosi, E. Bruendermann, A.-S. Mueller,
Karlsruhe Institute of Technology, Karlsruhe, Germany
Abstract
The linac-based test facility FLUTE (Ferninfrarot Linac-
Und Test-Experiment) at the Karlsruhe Institute of ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 0 |
c5385147-c647-40d9-8e4b-5a1b526915b8 | enablesexperimentswithshort-pulseelectronbunchesup
to90MeV.Forthiscontribution,theSLMwasusedtorecre-
atethemodifiedelectronbunchprofileandwepresentthe
observed characteristics after passing the traveling-wave RF
structure and magnetic chicane.
INTRODUCTION
The electron bunch parameters at modern accelerators
are aimed ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 0 |
b153564d-c4f4-489a-95e2-47c849edc650 | diagnostic approaches with spatial and temporal designs.
Inapixel-basedmodulation,aliquidcrystalsSLMallows
theinfluenceofintensityand/orphaseoftheincidentlaser
pulses[4]. Thephaseoftheincidentlightpassingthrough
theliquidcrystalpixelsisaffected,dependingontheelec-
trode settings. Eachpixelcan be modulated independently... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 0 |
241d795d-b801-4690-8d37-adddd3c732f5 | and reduce emittance.
Themodulationofthephoto-injectorwasdemonstratedat
FLUTEin[ 8]and[2]wheretwoseparatedelectronbunches
were generated simultaneously with the modulated laser
∗thiemo.schmelzer@kit.edu
(a) Laser pulse with 3x3 grid
modulation2 m after SLM.
(b)Modulatedspotsclipping at
mirror aperture after 4 m.
Figure... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 0 |
22b828eb-df2f-4ee9-bfda-6db487eba497 | EXPERIMENTAL SETUP
The experiments wereperformed at the fullyoperational
testfacilityFLUTE,wheretheSLMsetupwasimplemented
as selectable addition to the laser pulse transport system.
The added flip mirrors allow for simple and reproducible
comparison of the laser path with and without the spatial
light modulation active... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 0 |
3780e67b-1ffb-4445-a83c-60b2c7146d03 | verselaserpulseprofile. Therefore,theSLMwasinstalled
with a flip mirror setup as a side arm to the main laser path.
During installation, it was noticed that the laser beam diver-
genceaftertheSLMwassignificantlyhigherthanatnormal
operation. This led to clipping at the optical components
nexttothephoto-injector. A1:1tel... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 0 |
412fec88-7fdc-4004-a32d-b2c98cc5d2e6 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6144
2862 MC6.T25: Instrumentation: LasersWEP6144 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,... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 0 |
da3dc230-3cbc-411e-8e9f-162a702add63 | latedlaserwastoohighandledtoclippinginsidethelaser
transportasshowninFig. 1. Asmodulation,a3x3gridof
smalldotswasusedasreferenceimage. Thehigherintensity
in the center comes from the non-modulated zero-order.
Theeffectiveapertureoftheopticalcomponentsontheop-
tical table, e.g., UV-conversion and pulse stretcher, limite... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 1 |
aa67cc95-7dad-4372-8ffe-98469415dc0a | aftertheSLMresolvedthisissueandremovedthezero-order
from the modulated laser pulse.
Accelerator Settings and Diagnostics
DuringtheSLMexperiments,thetwoklystronspowering
the photo-injector and the linac were operated at 10 Hz
repetition rate. The beam energy after the electron gun was
≈5 MeV and ≈30 MeV after the linac.... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 1 |
7dcca739-5fb3-4988-8831-c698a9f72975 | thelinac,atotaloffourscreensareavailable,twoafterthe
linac, one screen at the dispersive section in the center of
the magnetic chicane and one close to the end of FLUTE.
RESULTS
The modulated laser pulse was used to generate two
spatially separated electron bunches at the FLUTE photo-
injector system, thus recreating p... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 1 |
5ae2c6b7-9628-4325-87c0-2fa8c4134ab8 | bunchlet. Thismatcheswiththeintensityprofileofthelaser
pulsetakenatthevirtualcathode. Inthelowerimage(2)the
electronbunchprofileisshownasobserveddirectlyafterthe
linac. The separation of the two bunches increased after the
acceleration. Thesemeasurementsshow,thatamodulated
laser profile can be used to imprint structure... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 1 |
709e1b92-62cd-4537-9f46-998d5a76e5b5 | Blazed Grating Rotation
The long laser propagation path after the SLM prohibited
theimprintingofcomplexstructuresontotheelectronbunch
aswellasfreelychangingthebunchpositionbyadjusting
the holographic image. However, it was possible to rotate
theblazedgratingandinresultrotatethelineofdiffracted
laser dots. This rotation... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 1 |
7f79cd17-44e3-4ed7-824c-2af14af857f6 | diffracted laser spots onto the cathode.
Quadrupole Focusing
To test the possibility of steering and controlling the two
co-propagating bunchlets, the quadrupole triplet after the
linacwasused. Itisusuallyusedtofocustheelectronbunch
before entering the bunch compressor. The effect of the
triplet on the two bunchlets is... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 1 |
be927029-9ff1-41aa-87e2-fa41f05f29cc | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6144
MC6.T25: Instrumentation: Lasers 2863WEP: Poster session WEP6144
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,... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 1 |
2cfac5cf-3f6a-4932-8317-1e01f948ae51 | Figure3: Theeffectofquadrupolefocusingofthemodulated
bunchconsistingoftwobunchletsisshownforthreedifferent
focusing strength from strong in a) to weak in c).
Dispersive Section
Afterthelinearaccelerator,thebunchcompressorisavail-
ableandprovidesadispersivesectionwithaprofilemonitor
in the middle of the magnetic chicane... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 2 |
1df13599-6d63-411c-8e82-8b5b883a7fb4 | to a significant horizontal widening (Fig. 4b). The increase
in size is very similar for both bunchlets. This demonstrates
thattheirenergyspreadisclosetoequal. Furthermore,al-
thoughthetwospotshaveasmallhorizontalseparation,it
remains the same for the different amounts of dispersion,
indicating the two bunchlets have t... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 2 |
67749191-30ab-4911-ad76-1c06207c73e9 | strated. We could show that the separation was preserved
throughoutthe whole accelerator. Theexistingdiagnostics
(a) Chicane at 5°
(b) Chicane at 14°
Figure 4: Modulated electron bunch in dispersive section.
The difference in the horizontal size between the low disper-
sionsetting(a)andthehighdispersionsetting(b)shows... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 2 |
f52f73d5-ac18-453c-b5fa-32795ced99b6 | the SLM and before a polarization sensitive filter. Using
quadrupole magnets, it was possible to control the position
of the bunchlets. With the dispersive section in the bunch
compressor, we demonstrated that the bunchlets have the
same energy and energy spread and purely differ in their
transverse position.
Next step... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6144.pdf | 2 |
0adf4b0b-d86e-450e-a5d6-9f2552747c06 | doi:1/zero.alt4.18429/JACoW-IPAC2/zero.alt425-THPB/zero.alt427
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c8085665-1321-4939-9dd9-b93e2330a426 | THE MYRRHA PHASE 1 MTCA.4-BASED LLRF SYSTEM
A. Bellandi, W. De Cock, F. Frank, J. Geerts, K. Geerts, E. Verhagen
Belgian Nuclear Research Centre, Mol, Belgium
Abstract
Thefirst100MeV stageof theMYRRHA superconduct-
ing RF linear accelerator is under construction in Mol, Bel-
gium. The machine will produce an instantane... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 0 |
df4bcf67-9729-4826-a30b-92d193955b40 | and stability within specifications.
Finally, since the maximum allowed beam-trip dura-
tion is less than 3s, real-time fault detection and recov-
ery techniques must be implemented in the Low-Level
RF (LLRF) controller. To meet these stringent require-
ments, the MTCA.4 standard and the RFSoC-based DAMC-
DS5014DR dire... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 0 |
665d9f9b-29e4-4450-876f-1c383b91b61e | fromreliabilitystudies,thefacilityfeaturestheProtonFacil-
ity (PTF) and Full Power Facility (FPF) to perform nuclear
andsolid-statephysicsstudies,R&Dforfourth-generation
nuclear power plants and fusion reactors and enable the pro-
duction of theranostic radioisotopes. The first part of the
acceleratorisa 16.6MeV normal... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 0 |
c12e2497-6bfa-4c0d-9705-56a29d64590d | trarytomostlarge-scalehigh-energyparticleaccelerators
inoperationtoday,MYRRHAPhase1isdesignedtooper-
ate with continuously varying beam duty factor. To reach
theserequirements,theLow-LevelRF(LLRF)controlsys-
templaysacrucialrole. Tominimizetherisks,MYRRHA’sACceleratorElectronics(ACE)groupiscurrentlycollabo-
ratingwithD... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 0 |
186f7b56-f09f-429e-952f-3970b4996704 | techniques,needtobedevelopedtoaddresstheuniquere-
quirements of MYRRHA.
HARDWARE
The hardware platform chosen for the LLRF system is
basedontheMTCA.4standard. Themotivationtochoose
this crate form factor is to achieve high reliability, redun-
dancy and modularity. Each crate will have up to 4 DAMC-
5014DR boards to dri... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 0 |
128f46d6-cde7-4cf5-9392-a34cc5de51bf | needed, additional computing and diagnostic capabilities to
the LLRF system.
DAMC-DS5014DR
DAMC-DS5014DRisanRFSoC-basedAMCthatisop-
timized for RF-based applications. The board is chosenfor
severalreasons: Theuseofdirectsamplingallowsusingthe
boardfortheacceleratorfrequenciesand,possibly,forfuture
704.4MHz ellipticalca... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 0 |
6e75b9ba-4aa6-48e9-9fed-a624e4043454 | ARM A53 processor and two ARM Cortex R5 realtime pro-
cessors. The A53 processor runs the main LLRF EPICS
IOC on embedded Linux. This IOC directly communicates
with the SoC programmable logic. The custom Real Transi-
tionModule(RTM)designindevelopmentforMYRRHA,
pairedwiththeDAMC-DS5014DRviatheMTCA.4zone-3
connector, pr... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 0 |
40861c17-5161-4a04-b479-c447d5231df7 | SOURCE LEBT RFQ MEBT1 CH1 7 MEBT2 CH8 - 15 MEBT3
LLRF systemsEnergy
1 1 (CHR) 1 (CHR) 2 (QWR) 7 8DUMPDUMP PTF FPF
Low β Low β 35m (176.1MHz) 5m
48 (12)100m (352.2MHz)
-1.5MeV 16.6MeV 70MeV 100MeVFigure1: LayoutoftheMYRRHAPhase1acceleratorhighlightingLLRFsystems. TwoCHcavitiesareinstalledinthe
Medium Energy Beam Transfe... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 1 |
b17860b7-b126-47a5-a9fa-22ecb4be1471 | tures, likeprogrammable amplification, attenuation, gating,
and power protection required to match the specifications
of the RFSoC’s converters. The RTM also applies low-pass
filtering with a 1.5GHzbandwidth thus enabling the use of
thisRTMforMYRRHAforalltheresonancefrequencies
of Phase 1 and Phase 2 cavities.
Piezoele... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 1 |
2b87f568-595b-4363-9784-a19478d20a71 | than3sto minimize beam generation downtime. Therefore,
piezoelectric tune control is implemented for these cavities.
The piezoelectric elements have a capacitance of 4µFat
cryogenictemperaturesandareoperatedbetween −40Vand
160V. The piezoelectric tuner systemhas a DC sensitivity
of10HzV−1[6] and it is expected that the... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 1 |
c08fb8f4-e1b9-4b6a-abf5-dfefdf76ba2f | MODULES
The LLRF of MYRRHA follows a modular approach
(Fig.2). The main functions are listedbelow.FieldControl Adigitalfeedbackloopblockcompen-
satesmodeluncertaintiesanddisturbances. Twooperating
modes are available: Generator-Driven Resonator (GDR)
modefornormaloperationwithbeamandSelf-ExcitedLoop
(SEL) mode for syst... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 1 |
62b2a836-b18d-4075-91d1-399c2460d534 | providereal-timeinformationtotheLLRFsystemtocom-
pensate the field for variations in phase and amplitude of
thebeam[ 7]. Adaptivefeedforwardisusedtocompensate
residual uncertainties in the RF chain [ 8,9].
BandwidthandDetuningEstimation Forsupercon-
ducting cavities, a real-time estimation of detuning and
storedenergyi... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 1 |
8413f624-923c-4b09-9054-f751413498e7 | going to be equal to or better than 35dB.
DetuningControl TheSRFcavityresonancefrequency
isstabilizedusingcontrolalgorithmsrunningonanARM
R5 real-time core.
An integral controller compensates slow detuning effects
caused by cryogenic pressure drifts. The control bandwidth
is limited to avoid exciting mechanical resonan... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 1 |
1e5fd171-fdea-46ce-a8d7-0903af57127d | Figure 2: Blockschemeof the LLRF system.
Periodic microphonics disturbances are suppressed using
a Narrowband Active Noise Control (NANC) algorithm.
The algorithm adapts the amplitude, phase and frequency
of a numerically controlled oscillator to cancel sinusoidal
detuning noise sources in the 0-200Hzrange [13].
Amplif... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 2 |
0633a594-c9c6-4bbb-8bd0-8fb56e170f7f | toenvironmentalconditions, theLLRF also featuresan Out-
put Vector Correction (OVC) unit to adaptively compensate
residual plant mismatches [ 15].
Data Acquisition The decimated RF signals are con-
tinuously stored using a double-buffering scheme directly
in the A53 processor memory. A dedicated FPGA mod-
ule computes ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 2 |
afe838de-2ef3-4ddf-bfd4-0d2f86963939 | The affected cavities need to ramp down to allow the re-adjustmentofthe SSAdrain voltageand thenswitchedback
on with the new gradient. To achieve determinism in the
reconfigurationprocedure,oneCortex-R5coreoftheRFSoC
is intended to be used to automate setup tasks. Besides
configuration tasks, this core actively monitor... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 2 |
17366044-edeb-4fef-9cea-679fc57df871 | porting the code between the two. To validate the chosen
solutions,itisplannedtouseasimulator-in-the-loopstrat-
egy. Furthermore,thenormal-conducting(ATHENA)and
superconducting(FREIA)testfacilitieswillalsosupportthe
R&D efforts of the MYRRHA LLRF control system with
its first deployment by the end of 2026.
ACKNOWLEDGEM... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 2 |
1dffbe13-ca99-4c9d-9345-bf250c18b120 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6145
2868 MC6.T27: Instrumentation: Low Level RFWEP6145 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... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 2 |
5e7e015d-1d4f-45f3-959b-7d1757badebd | [2]S. Jablonski et al., “High-speed ADC and DAC MicroTCA.4
AMC-RTM pair for diagnostics and feedback implementa-
tions”, in Proc. IBIC’24 , Beijing, China, Sep. 2024, pp. 402–
405. doi:1/zero.alt4.18429/JACoW-IBIC2/zero.alt424-WEP55
[3]J. Georget al., “Board bring-up with FPGA frameworkand
ChimeraTK on Yocto”, in Proc.... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 3 |
479ed7a4-bd2b-4f09-82f6-351981a58ded | GesellschaftfürKernforschungmbH,Karlsruhe,Germany,
1971.
[6]N. Gandolfo et al., “Development and performance of spoke
cavitytunerfortheMYRRHAlinacproject”,in Proc.SRF’19 ,
Dresden, Germany, Jun.–Jul. 2019, pp. 667–670.
doi:1/zero.alt4.18429/JACoW-SRF2/zero.alt419-TUP/zero.alt487
[7]L. Butkowski et al., “Implementation ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 3 |
a0a4b6c0-de85-470c-9831-0553e47ca05a | tributed beam-based controller design for free-electron
lasers”, Ph.D. thesis, Hamburg University of Technology,
Hamburg, Germany, 2014.[10]B.Richter etal.,“Estimationofsuperconductingcavityband-
width and detuning using a Luenberger observer”, arXiv,
2025. doi:1/zero.alt4.4855/zero.alt4/arXiv.25/zero.alt46.212/zero.al... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 3 |
482687d5-162c-42a0-9b9f-4a2f9fd97b9f | doi:1/zero.alt4.1/zero.alt416/j.nima.2/zero.alt424.169172
[13]A.Bellandi etal.,“Narrowbandwidthactivenoisecontrolfor
microphonics rejection in superconducting cavities at LCLS-
II”,arXiv, 2022. doi:1/zero.alt4.4855/zero.alt4/arXiv.22/zero.alt49.13896
[14]A. Bellandi et al., “Results on FPGA-based high-power tube
amplif... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 3 |
e5f92569-f80d-4a22-a77c-5d42e4b51955 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6145
MC6.T27: Instrumentation: Low Level RF 2869WEP: Poster session WEP6145
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... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6145.pdf | 3 |
8646bc64-c21b-4306-8d81-9ef03241931e | RF SYSTEM STATUS FOR PERLE *
C. Joly†, A. Back, N. Belouchrani‡, S. Berthelot, D. Charlet, P. Gauron, X. Lafay, J. -F. Yaniche
Université Paris -Saclay, CNRS/IN2P3, IJCLab, Orsay, France
F. Bouly, Univ. Grenoble Alpes, CNRS/IN2P3, Grenoble INP, LPSC , Grenoble, France
A. Buthod, Univ. Claude Bernard Lyon 1, ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 0 |
f829b149-b9c4-47d1-b6e3-01de169a507d | achieve the performa nces. Firstly, a Distributed Master Os-
cillator (DMO), White Rabbit (WR) protocol based allow-
ing to distribute a reference and to generate locally the syn-
chroniz ed RF signals and clocks needed. It is also associ-
ated to a timing system using the same WR enhanced hard-
ware (IDROGEN Board) to... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 0 |
791aad16-4da3-46a5-916b-b458a34e80f0 | tions will be presented with some outlooks.
INTRODUCTION
The PERLE project aims to build and operate of a 5 MW
at 250 MeV Energy Recovery Linac (ERL) demonstrator,
with superconducting cavities operating at 801.58 MHz
and 2 K with accelerating gradients up to tens of MV/m
(cf. Table 1 parameter list). Th... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 0 |
f3aa255e-c389-4a6d-a0ef-02c11a22c34d | the Linac using a merger [2]. In the ERL section a second
cryomodule said “Linac cryomodule” is integrated with
four superconductin g 5-cells elliptic cavities allowing the
energy to be increased by 82MeV with each acceleration paths (3 -loops planned in the Phase 2 project to achieve
~250 MeV) .
Table 1: Ell... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 0 |
3c8493f4-0460-40c5-8c05-9eee91396a27 | formances and accuracy requirements of accelerators to en-
sure an efficient, reliable and sustainable operation of such
high power superconducting accelerators like PERLE.
To limit the joule heating losses and therefore cryogenic
consumption, a superconducting cavities quality factor of
around 1 × 10
10 is requ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 0 |
b57a43eb-a8b2-456e-811f-c5adc675bcc8 | ation pressure can induce a frequency detuning leading to
an increase in RF power consumption. To compensate for
these variations, which impact beam quality and stability,
it is necessary to f inely control the accelerating field am-
plitude (Eacc) and phase (φ) as well as the resonance fre-
quency of each cavity... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 0 |
8867095e-60cb-49e3-8856-dac5082e22a1 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6146
2870 MC6.T27: Instrumentation: Low Level RFWEP6146 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... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 0 |
9348a66b-8cb1-406a-82ce-cafb9b330997 | the associated radiofrequency power source. These control
systems, known as Low Level Radio Frequency systems
(LLRF), are synchronized with all the machine by a RF
Master Oscillator (MO). For PERLE, The LLRF system is
µTCA.4 based with several benefits: a high level of inte-gration, a n important available electro... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 1 |
2955ff1c-d59f-4fe0-a4e8-35f6cafc361b | (electron gun laser), 200.395 MHz (LLRF clocks), 40.079
MHz (injector), and 10 MHz (instrumentation) while meet-ing stringent jitter requirements, which vary significantly
with frequency (e.g., ± 0.1° phase jitter corresponds to only
0.346 ps @ 801.58 MHz). The reference oscillator, often
based on OCXOs or rubidium... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 1 |
d598742a-009f-4d64-9bdf-7f253f65bd19 | bles sub -nanosecond synchronization over long distances
but requires hardware improvements to achieve the <350
fs jitter target @ 801.58 MHz -Offset range [1 Hz –1 MHz].
Due to the mixed hardware architecture used (VME +
µTCA), an R&D project was launched at IJCLab through
the loc al use of high -performance frac... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 1 |
404464e5-5adf-434a-b536-1ddd2831bf31 | This solution is based on a partially optical approach that
aims to preserve the advantages of the IDROGEN board
and the WR protocol while ensuring jitter < 100 fs. Inte-
gration into the REFIMEVE network further enhances sta-
bility by distributing atomic clock references (Maser) via
fiber optics, while a rubidiu... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 1 |
dcdfb7d9-bf86-423b-b63f-ed32c5ba7f95 | 10 MHz reference and PPS outputs are also planned to be
integrated. LLRF SYSTEM
The field stabilities require ments (Eacc <0.1 % and
φ < 0.1° rms) involve to improve the Signal to Noise Ratio
(SNR) and reduce the latency using an oversampling with non-IQ demodulation ratio optimized compared to a previ-
ous de... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 1 |
190b6ff7-1b44-44d4-a54b-887b90345008 | Kintex UltraScale FPGA with two FMC slots, one of which
accommodate the DAQ1430 (10 ADCs and 2 DACs chan-nels). The second free FMC slot, is used by a FMC
DIO3118 dedicated to interface interlocks to or from the
LLRF system. The IFC1420 is provided with a Network
on Chip (NoC) based FPGA Design Environment with a... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 1 |
96598612-a0d1-4c4c-a629-3dbeab64f3ef | the Frequency tuning control .
RF POWER SYSTEM
The RF power system is designed to adjust the RF power
delivered to the superconducting cavities, taking into ac-
count the performance of both the cavities and their power
couplers. This adjustment is also based on RF commission-ing results, particularly reg ulation ... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 1 |
ee5f51e2-98c2-4a1c-8399-51ed4cb2e054 | ISBN: 978-3-95450-252-3 ISSN: 2673-5350 doi: 10.18429/JACoW-IPAC2026-WEP6146
MC6.T27: Instrumentation: Low Level RF 2871WEP: Poster session WEP6146
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... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 1 |
7f883f88-9231-4969-bfc9-6f1870605cb7 | The RF power circuit therefore consists of a S olid-State
Amplifier (SSA) with a WR1150 waveguide output con-
nected to port 1 of an isolator (a circulator with a load on
port 3). The isolator’s output (port 2) is connected to the
power coupler via a waveguide section of less than 20 m
combined with a waveguide -t... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 2 |
b5783490-0f9f-42a3-a5a3-c3a363e65168 | ing loop delay, thereby ensuring the stability of the accel-
erator field’s amplitude and phase control at high loop gains.
Figure 3: Floor Plan of the IGLOO building, which houses
PERLE.
CONCLUSION
The RF system is composed of the LLRF and HLRF sys-
tems associated to the timing, the Machine Protection Sys-tem... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 2 |
f8721fe4-bc6d-4694-ac99-7b820239b40e | Another solution, using the new RF front -end board
RDC1470v2, which operates over a wide frequency range,
could be applied. Moreover, the RF power amplifiers and
the associated components as circulators, loads, directional
couplers have been defined and close to be ordered. One
RF amplifier prototype will be d... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 2 |
626dd0ae-d25f-414e-b5a5-94e01264ab8d | covery Linac PERLE ”, presented at IP AC’26 , Deauville ,
France , May 202 6, paper THP2104, this conference.
[2] R. Roux et al ., “Status of the PERLE’s injector”, presented at
IP AC’26, Deauville, France, May 2026, paper WEP5090, this
conference.
[3] F. Bouly, C. Joly, N. Belouchrani and R. Roux, “RF cou... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 2 |
df063c4d-57de-4d20-a7e1-271a6c39b865 | Sep. 2022, pp. 771-774.
doi:10.18429/JACoW- LINAC2022- THPOPA14
[6] IOXOS, https://www.ioxos.ch
[7] C. Joly et al. , “RF requirements for RF power SSA prototype
8.8 kW”, IJCLab, Orsay , France, Rep. ATRIUM -1111723,
Oct. 2025 .
[8] K. Popov et al. , “Study of laser -beam arrival time synchroni-
zation towards... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6146.pdf | 2 |
f6a60cdc-87ec-4a76-88e7-f8c5bc94a21a | DETUNING ESTIMATION FOR A
DOUBLY-FED NORMAL-CONDUCTING GUN
M. Herrmann∗, J. Branlard, F. Brinker, M. Hoffmann, V. Katalev, S. Pfeiffer, H. Schlarb, C. Schmidt
Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
Abstract
At the European Free-Electron Laser (EuXFEL) super-
conductinglinac,arevisednormal-conductinggun... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6148.pdf | 0 |
5bbbd20a-fcf1-4e34-ab6c-b7a64b02a78c | and an algebraic stationary approximation.
INTRODUCTION
On November 2025, a revised gun design [ 1] has been in-
stalledattheEuXFEL(seeFig. 1). FromanRFperspective,
the main changes in the current revision 5.2 are
•changefromsingle-feedtodouble-feedwiththeindi-
vidual waveguide branches equipped with forward and
reflec... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6148.pdf | 0 |
06fea950-5eae-43ee-ae65-9ced7d3aa3e2 | pulse dynamics are dominated by introduced RF energy,
andinterpulsedynamicsaredominatedbyconvectiveheat
flux to the cooling medium, with the dominating source
∗m.herrmann@desy.deofdetuningbeingtheheat-upofthecavity’sinnersurface,
governingatemperature-to-detuningsensitivityofapprox.
−21kHz/K [ 2].
Since the surface tem... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6148.pdf | 0 |
43cc9579-661c-4a09-86f9-5ce661193d0e | performance depends on the accuracy of the model, trigger-
ing the need for identifying unknown system parameters.
This publication is structured as follows: the modeling
sectiondetailstheordinarydifferentialequations(odes)rep-
resentingthecoupledRF/detuningdynamics,sectionparam-
eter identification explains the white-... | D:\Daily_ihep\Conferences\IPAC2026\WEP\WEP6148.pdf | 0 |
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