Maher started the modulator

9h50 HV is on

09h53 Beam is in the ring w/o RF

Les redpitaya baie 17 'RF" ne "communiquent" plus avec JIVE.

IL faut les redémarrer... je ne sais pas faire!

Nicolas passe en fin de matinée pour essayer de les redémarrer

Vincent

07h30 Start-up modulator, laser, fridge, chillers, cycling remotly

Vacuum in the FPC is still ~1e-7 (sometimes goes to ~7-8e-8);

No RF signals. The same problem.

Vacuum problem in the half ring; same as on Friday. Solved by Eric.

Problem with SEPTUM. It does not start.

RF cavity in the Ring can be se only to 10 kV. We can not set other voltage. Maher checked, probably the rror with profibus. Hep is needed.

10h30 starting the linac. Transport of the beam in the TL.

Cameras do not work corretly, so it is difficult to adjust the energy spread of the beam.

Septum problem prevents us to inject in the ring.

10h56 Energy = 50 MeV, Laser Phase 108 dg., Sect. Phase 220 dg., Sect. Att. 2.43 dB, I_Gun -71.6393 pC, I_Linac -69.4399 pC, I_TL -69.8472 pC RF_Ampl. 10.8122 kV, RF_Phase -48.5 dg.

11h JN is helping with the RF cavity

13h The problem with RF cavity is not solved, the reson why the voltage does not inrest and stays at 10 kV is not clear.

Maher with JN tries to solve the problem with SEPTUM,

13h20 Septum is OK now. Beam is in the ring w/o RF. recipe_recipe_LI_TL_RI_all_20260422_18_34_34.txt loaded

13h30 Laser Att. 340

13h33 Energy = 50 MeV, Laser Phase 108 dg., Sect. Phase 220 dg., Sect. Att. 2.52 dB, I_Gun -92.8156 pC, I_Linac -122.1748 pC, I_TL -95.4294 pC RF_Ampl. 0 kV, RF_Phase 0 dg.

14h Mistreggiring problem. Nicolas found that the IP address of Rigol changed.

The colleage from SOLEIL will come in the afternoon to see the problem with the RF cavity.
The PC in the control room (client 1 and 2) are very slow, not clear what is the reason.

15h17 Kickers off. TL/DP off. Energy = 50 MeV, Laser Phase 108 dg., Sect. Phase 220 dg., Sect. Att. 2.52 dB, I_Gun -102.5088 pC, I_Linac -99.2102 pC, I_TL -0.0013676 pC RF_Ampl. 0 kV, RF_Phase 0 dg.

I am trying to check the beam charge using TL/FC01. The cable from wac02/ch0 (A9 on cross-panel #xxx) was connected to the oscilloscope CH2 (impedance 1 MΩ). According to Vincent, the cable length is 31 m, and the capacitance is 2.5e-9 F. At the operating point, the dark current and the beam charged the cable (approximately 6 μs after triggering) to -35.69 mV. The dark current alone charges the cable to -13.7 mV (with the screen inserted). Therefore, the beam charge is Q=C*V=2.5e-9*22e-3=55e-12 C. With the screen inserted - DeltaV=22.7 mV. The first attempt to change the position of the beam does not increase this voltage significantly (but reduces it at large displacements). Reducing the solenoid current to 180 A increases the voltage on the cable, but the DeltaV remains almost the same: 23.3 mV (58 pC). Thus, there is a certain discrepancy between ICT measurements and result of these measurements that needs to be understood.

17h35 The RF resonator is now working. But the RF resonator DS does not show the frequency. It is necessary also to adjust the phase of the resonator.

17h43 ThomX was stopped

08h26 Start-up modulator, laser, fridge, chillers, cycling

09h31 Low SF6 pressure => JN helped

11h HV ON. We do not see the RF signals, even  the baselines (RedPitaya). The Wevecatchers are also not triggered. probably problem with timing or their configs. Help is needed !!!

Apparently, there was the electricity cut. Help is also needed with the RF cavity.

12h10 something happened. Modulater went to OFF, dipoles are in error state. The valves became orange on the PSS screen.  

Problem with Air Comprime => Solved !

JN et Maher heped to start again the Air Comprimee.

Mochamed fixed RF amplifier, but it gives only 10.7 kV.

Power supply of WAC3 is dead.

16h00 We had another problem (see photo).

16h15 The problem with valves was fixed

16h17 HV on

16h22 The RF gun's ICT was too low. Solution - increased the RF gun's attenuator to 1 dB, then returned it to 0 dB. Dark current corresponds to 15 mV

16h35 Solenoids are off (external error). the RF Gun IST shows 100 pC (Laser phase of 99 degrees). the section exit ICT shows 20 pC 

16h52 ThomX was stopped

17h18 It seems resetting the red pitaya does not help

09h00 Start-up modulator, laser, fridge, chillers

After discussion with Daniele

Goal/Priority: Check for leakage in the FPC

10h17 HV is on, cycling all magnets. The chillers were not taking the set temperature (Consigne). It was necessary to reset it in the DS "RF Canon+Section"

10h24 The modulator set to standby. Check for leakage

11h00 ThomX was stopped

09h35 Start-up modulator

09h52 Start the fridge

09h55 Start chillers

The photocathode laser is in the init state. Is there anyone who can fix it?

The MPS screen does not display any selections for machine configuration. The table (Choix des configurations de Tir) is empty, so "Machine au Repos". 

13h30 Problem with MPS and laser cathode prevents us to start the accelerator. We put the modulator OFF.

Please, send email to thomx.operation in case of any progress on that matters.

07h35 Start-up modulator (does not go to standby), laser, magnets, cycling.

9h50 HT ON

~10h30 Electricity cut

14h Restart of all the machine...

Almost all systems were restarted, except for the photocathode laser.

17h40 ThomX was stopped

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.

The problem with MPS is the OC/AVAL02 FP valve. It is in two states at the same time: Closed and Open.

It was the OC/AVAL01 FP valve

recipe_recipe_LI_TL_RI_all_20260422_18_34_34.txt loaded

14h54 Beam is in the ring w/o RF. Thank you all !!!!.

15h15 Laser Att. 360,  Energy = 50 MeV, Laser Phase 26 dg., Sect. Phase 250 dg., Sect. Att. 2.42 dB, I_Gun -179.1795 pC, I_Linac -205.8011 pC, I_TL -186.6367 pC RF_Ampl. 99.1184 kV, RF_Phase -50 dg.

Laser Att. set to 320 for 100 pC

15h25 Energy = 50 MeV, Laser Phase 26 dg., Sect. Phase 250 dg., Sect. Att. 2.33 dB, I_Gun -96.7941 pC, I_Linac -124.7882 pC, I_TL -102.9734 pC RF_Ampl. 99.1184 kV, RF_Phase -50 dg.
 

15h28 recipe_recipe_LI_TL_RI_all_20260121_10_35_05.txt loaded. There is storage, but it is necessary to optimize it

15h33 ring_saving

15h35 recipe_recipe_LI_TL_RI_all_20260422_18_34_34.txt loaded

15h36 ring_saving

17h41 ThomX was stopped

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.