08h35 Start-up modulator (it was already on standby), laser, magnets, cycling.

As yesterday there is a problem with the MPS to start the machine. We are trying to investigate whether it is related to the vacuum or something else.

Problem with the solenoid COL.01 (Internal Interlock Hard).

Help is needed.

At this moment, apparently we are blocked by the closed vacuum valve of the FPC. To be checked with Nourredine (emails sent).

The vaccum level in the FPC is not yet good to open the valve. Eric will check it.

10h10 Switched to the Linac+TL+EL configuration. HV is on (the modulator was in the local mode). Interlocks even at HV 1200 V, the sect att. 3 dB. Linac 04 vac is high.  

10h33 There are breakdowns at 26 dB the section att. and 25 dB of the RF gun att. These are not in vacuum breakdowns. Probably it is the klystron problem.

10h50 The modulator is in the standby mode.

Maher is coming to check the klystron and Jean-Noel is working on the solenoid power supplies.

11h40 Maher fixed problem with the klystron by increasing the filament power. At 84 kV, I = 48.7 A (microperveance 2.0). At 293 kV, I = 294 A (microperveance 1.85, should be 2.0).

12h03 The machine configuration without FP closes the photocathode laser shuter, so we can operate only in the Linac+TL+EL configuration.

12h36 Energy = 50 MeV, Laser Phase 25 dg., Sect. Phase 253 dg., Sect. Att. 2.26 dB, I_Gun -95.0704 pC, I_Linac -92.7397 pC, I_TL -3.7568 pC RF_Ampl. 0 kV, RF_Phase 35.5 dg.

Laser Att. 360, Linac steerers H: [0.31 -2.62], V: [-1.87 2.88]

12h43 Energy = 50 MeV, Laser Phase 26 dg., Sect. Phase 250 dg., Sect. Att. 2.35 dB, I_Gun -101.3924 pC, I_Linac -99.5194 pC, I_TL -101.3812 pC RF_Ampl. 0 kV, RF_Phase 35.5 dg. 

13h17 Laser Att. 410 (max) Energy = 50 MeV, Laser Phase 26 dg., Sect. Phase 250 dg., Sect. Att. 2.35 dB, I_Gun -138.8712 pC, I_Linac -135.3968 pC, I_TL -137.4172 pC RF_Ampl. 0 kV, RF_Phase 35.5 dg.

At the moment maximum charge is 135 pC with irise Ø of 1.3 mm  (possibly because the laser photocathode shutter is in the wrong position)

13h25 The modulator is in standby mode. Maher can remove the MPS short.

Hello,

I short-circuit the MPS input to modulator, we can trig modulator, the klystron filmant time goes to full time  , need 45 min, you can start at 14:35

Maher

11h20 Try to restart the accelerator. Start-up modulator, laser, fridge, chillers

Problem, with all magnets control All DS are in FAULT state. Help is needed.

It is solved.

MPS prevents klystron output power from turning on. Probably due to the closed FP valve.

15h45 ThomX was stopped.

mise à jours du post : https://elog.lal.in2p3.fr/THOMX/Commissionning/1188

** Laser PC ***

- Sortie Laser: 120 uJ 

- Injectée ligne transport: 110 uJ

- Sortie ligne transport: faisceau trop gros pour une mesure correct

- Sortie Iris (ouverture max): 80 uJ

- Sortie iris (1.3mm): 28uJ

- injectée canon (iris 1.3 mm, 420 pas) : 22 uJ

10h02 Start-up modulator, laser, fridge, chillers

The SF6 pressure is low. Magnet power supplies filed to start.

11h17 Stop ThomX

08h45 Start-up modulator, laser, magnets

09h38 Shutter Laser Linac is yellow. Tuning off the gun operation key does not change it to the red. Need help.

09h55 HV is on

09h56 HV is off. The fridge was started then chillers.

10h20 The laser shutter is OK.  HV is on

recipe_recipe_LI_TL_RI_all_20260422_18_34_34.txt loaded

Linac steerers were adjusted.

11h35 Energy = 50 MeV, Laser Phase 9 dg., Sect. Phase 223 dg., Sect. Att. 2.19 dB, I_Gun -48.3388 pC, I_Linac -54.8343 pC, I_TL -53.5573 pC RF_Ampl. 0 kV, RF_Phase -30.5 dg.

Beam is in the ring W/O RF

11h45 RF is on

11h54 Energy = 50 MeV, Laser Phase 9 dg., Sect. Phase 223 dg., Sect. Att. 2.12 dB, I_Gun -49.1448 pC, I_Linac -55.6953 pC, I_TL -54.5153 pC RF_Ampl. 49.3668 kV, RF_Phase 35.5 dg.
It looks like RF cavity tuning does not work. Help is needed.

12h07  Mesure d'energie en sortie canon sur LISST1 en fonction du courant du steerer LI/PS/STR.01-H.01

'Energy=4.83MeV'

Several scans of the laser attenuator 200 to 430 at the Gun attenuator 0, 1, 2, 3 dB but at the same phase.

13h22 Standby

13h32 HV is on

15h17 Thomx was stopped

02/06/2026

~15h30 Starting all system

16h Start up of the modulator, laser, magnets

Problem with the shutter, it is in the orange state. 

demarrage machine 8h30

faisceau ok vers 10H

14h mesure 50 MeV

16h : passage à 8MeV 

Demarrage machine 8h40

pB reflechi canon... temp consigne 27.7C

10h50 redemarrage chiller gun ... 

Attenuateur laser 305mm

pB chiller section redemarrage.

Att section 2.24dB phase 232° dipole 158.6A

camera TLSST03 déconnectée du réseau

Timing SST TL 3 retard -6.66µs au lieu de -16µ

réseau très lent

arret machine 17h

9h30 test radioprotection OK (mesure en dessous du bruit de fond)

13h30 fenetre installée pompage en cours

14h fin de l'intervention

8h00 : mise en chauffe en remote (frigo/chillers, laser, modulateur, cyclage)

9h00 : mise en chauffe en remote (frigo/chillers, laser, modulateur, cyclage)

Dalkia solved the problem with vooling circuit in the morning

10h15 mise en chauffe  (frigo/chillers, modulateur, laser, cyclage)

11h16 HV is ON

11h57 Energy = 50 MeV, Laser Phase 54 dg., Sect. Phase 215 dg., Sect. Att. 2.34 dB, I_Gun -90.3427 pC, I_Linac -115.8595 pC, I_TL -104.0088 pC RF_Ampl. 148.7161 kV, RF_Phase -45 dg.
15h01 Energy = 50 MeV, Laser Phase 35 dg., Sect. Phase 218 dg., Sect. Att. 2.456 dB, I_Gun -101.8359 pC, I_Linac -120.7055 pC, I_TL -114.6878 pC RF_Ampl. 148.7161 kV, RF_Phase -49.5 dg.
18h04 Energy = 50 MeV, Laser Phase 27 dg., Sect. Phase 216 dg., Sect. Att. 2.421 dB, I_Gun -98.616 pC, I_Linac -120.8228 pC, I_TL -14.2993 pC RF_Ampl. 148.7161 kV, RF_Phase -35 dg.
20h13 Energy = 50 MeV, Laser Phase 28 dg., Sect. Phase 216 dg., Sect. Att. 2.481 dB, I_Gun -110.7257 pC, I_Linac -129.583 pC, I_TL -123.6972 pC RF_Ampl. 148.7161 kV, RF_Phase -33.5 dg.
 

7h30 : mise en chauffe en remote (frigo/chillers, laser, modulateur, cyclage) ==> dipôles non cyclé (en défaut) ==> défaut acquité et cyclage fait.

8h20 : intervention sur le laser PC. Le shutter de la salle laser était resté bloqué. Le faisceau semble revenu à la normale. 

image laser sauvées dans le dossier du jour. (puissance laser PC en entrée de ligne de transport 105uJ).

==> impossible d'ajouter des images sur le e-log (erreur 413 entity too large). 

09h39 HV is ON

10h02 Energy = 50 MeV, Laser Phase 61 dg., Sect. Phase 218 dg., Sect. Att. 2.355 dB, I_Gun -99.4692 pC, I_Linac -102.9732 pC, I_TL -113.2398 pC RF_Ampl. 0 kV, RF_Phase -36 dg.

Can not start the RF cavity because of the intetlock.

10h45 Scan phase charge for the RF gun att. [0 2 3 6] dB

12h25 Energy = 50 MeV, Laser Phase 53 dg., Sect. Phase 217 dg., Sect. Att. 2.456 dB, I_Gun -100.0525 pC, I_Linac -124.744 pC, I_TL -113.9338 pC RF_Ampl. 97.6562 kV, RF_Phase -45 dg.

16h16 Energy = 50 MeV, Laser Phase 45 dg., Sect. Phase 221 dg., Sect. Att. 2.42 dB, I_Gun -101.3927 pC, I_Linac -127.0728 pC, I_TL -115.2858 pC RF_Ampl. 148.7161 kV, RF_Phase -46.5 dg.
At around 5:30 p.m., the modulator and magnets stopped, likely due to cooling water problems. message was sent to Dalkia 5:45.

10h30 : mise en chauffe  (frigo/chillers, modulateur, laser, cyclage)

All rondes are broken, THOMX key is turned. What is the reason of this intervention?,  There is nobody around. Jean-Noel came and helped to solve the problems.

Help is needed to set up everythiing (rondes sous-sol, PSS....) and tune the photocathode laser.

7h30 : mise en chauffe en remote (frigo/chillers, modulateur, laser, cyclage)

08h45 HV is on

Laser camera does not work. Help!!!

MRSV camera too!!!

The cemeras and laser are working now. But we do not see the laser beam. Daniele checked the laser spot in the casemat. Apparently it is cut. Help is needed with the laser!

12h  ThomX Standby while waiting for the help

7h30 : mise en chauffe en remote (frigo/chillers, modulateur, laser, cyclage)

9h00 HV is ON

10h33 Energy = 50 MeV, Laser Phase 77 dg., Sect. Phase 217 dg., Sect. Att. 2.546 dB, I_Gun -98.9021 pC, I_Linac -131.1291 pC, I_TL -120.2702 pC RF_Ampl. 148.7161 kV, RF_Phase -36.5 dg.
12h53 Energy = 50 MeV, Laser Phase 78 dg., Sect. Phase 218 dg., Sect. Att. 2.577 dB, I_Gun -97.6327 pC, I_Linac -124.7496 pC, I_TL -111.3515 pC RF_Ampl. 148.7161 kV, RF_Phase -35 dg. receipt 10 Apr last, X flux 35e3 pA, Las. Att. 276
14h56 Energy = 50 MeV, Laser Phase 75 dg., Sect. Phase 215 dg., Sect. Att. 2.53 dB, I_Gun -94.9526 pC, I_Linac -122.0817 pC, I_TL -108.2541 pC RF_Ampl. 148.7161 kV, RF_Phase -35 dg. sometimes it was 50e3 pA, Las. Att. 276

19h08 Energy = 50 MeV, Laser Phase 75 dg., Sect. Phase 212 dg., Sect. Att. 2.551 dB, I_Gun -350.6393 pC, I_Linac -372.038 pC, I_TL -364.2529 pC RF_Ampl. 148.7161 kV, RF_Phase -35 dg. Las.  Att. 375

19h10 Energy = 50 MeV, Laser Phase 75 dg., Sect. Phase 212 dg., Sect. Att. 2.551 dB, I_Gun -368.8974 pC, I_Linac -390.9133 pC, I_TL -382.9227 pC RF_Ampl. 148.7161 kV, RF_Phase -35 dg. Las.  Att. 415

20h44 Energy = 50 MeV, Laser Phase 74 dg., Sect. Phase 215 dg., Sect. Att. 2.605 dB, I_Gun -87.9133 pC, I_Linac -113.5951 pC, I_TL -101.2012 pC RF_Ampl. 148.7161 kV, RF_Phase -36 dg. Las.  Att. 280

20h52 Thomx was stopped

8h05: mise en chauffe à distance (frigo/chillers, modulateur, laser, cyclage)

*** Programme : Mesure spectre angulaire @40MeV

Matin : probleme de stockage faisceau 40 MeV
Demarrage prise de donnees : ~ 15h       -     Flux ~ 1500 (I3+I4) 

16h50 Energy = 40.2 MeV, Laser Phase 47 dg., Sect. Phase 218 dg., Sect. Att. 4.091 dB, I_Gun -125.8969 pC, I_Linac -158.2249 pC, I_TL -140.5174 pC RF_Ampl. 148.7161 kV, RF_Phase -41 dg.

8h00 : mise en chauffe en remote (frigo/chillers, modulateur, laser, cyclage)

10h Problem with modulator; It went to OFF and it does not start. Need help;

12h40 Fixed by Maher

12h42 HV is ON.

 recipe_recipe_LI_TL_RI_all_20260410_18_30_00.txt loaded. Beam is in the ring with RF, all is OK

13h02 Energy = 50 MeV, Laser Phase 62 dg., Sect. Phase 222 dg., Sect. Att. 2.353 dB, I_Gun -84.0745 pC, I_Linac -110.6456 pC, I_TL -97.627 pC RF_Ampl. 148.7161 kV, RF_Phase -42.5 dg.

==>40 MeV

recipe_recipe_LI_TL_RI_all_20260414_16_25_18.txt saved

16h36 Energy = 40.2 MeV, Laser Phase 66 dg., Sect. Phase 222 dg., Sect. Att. 3.974 dB, I_Gun -109.5905 pC, I_Linac -137.9429 pC, I_TL -118.206 pC RF_Ampl. 148.7161 kV, RF_Phase -42.5 dg.

recipe_recipe_LI_TL_RI_all_20260414_16_37_59.txt saved. Flat orbits (both), good storage, small vert. size at EL/SST01

17h07 Energy = 40.2 MeV, Laser Phase 58 dg., Sect. Phase 214 dg., Sect. Att. 4.001 dB, I_Gun -119.9999 pC, I_Linac -147.2619 pC, I_TL -131.3768 pC RF_Ampl. 148.7161 kV, RF_Phase -42.5 dg. X =+2.5 mm
 

7h40 : mise en chauffe en remote (frigo/chillers, modulateur, laser, cyclage)

08h43 HV is ON

recipe_recipe_LI_TL_RI_all_20260409_17_07_05.txt loaded

09h00 Energy = 50 MeV, Laser Phase 63 dg., Sect. Phase 217 dg., Sect. Att. 2.49 dB, I_Gun -86.2367 pC, I_Linac -110.0622 pC, I_TL -100.1516 pC RF_Ampl. 48.9051 kV, RF_Phase -35 dg.

09h25 standby, adding SF6 pressure

09h33 HV

10h43 Energy = 50 MeV, Laser Phase 116 dg., Sect. Phase 233 dg., Sect. Att. 2.45 dB, I_Gun -90.9374 pC, I_Linac -114.4855 pC, I_TL -104.2454 pC RF_Ampl. 148.7161 kV, RF_Phase -32 dg.

17h01 Energy = 50 MeV, Laser Phase 97 dg., Sect. Phase 240 dg., Sect. Att. 2.406 dB, I_Gun -100.3151 pC, I_Linac -127.6278 pC, I_TL -114.2449 pC RF_Ampl. 148.7161 kV, RF_Phase -41 dg.