Bonjour,

actuellement le contrôle du shutter (gate) du laser est dispo seulement avec le jive - Atkpanel laser.

Viktor.

Disjonction de PA 15h00=

Disjonction de PA 15h36

Etape 1 conditionnement : 1µs @1Hz jusqu'à   ? dB

Beaucoup degazage autour  de valeur l'atténuation section 7.5 dB ( Pik = 35 MW (1220 V)===> Pis = 5MW)

impossible d'ouvrir fenetre setting et fenetre automated RF conditionning

La synchro a été testée ce matin:

Il y avait effectuvement un pB de faux contact qui empechait la synchro de fonctionner.

Pour ce qui est de l'interface Fréquence Synchro:

le choix des fréquences fonctione... il est un peu récalcitrant... il faut parfois valider (bien cliquer sur le choix dans le menu déroulant) plusieurs fois les fréquences  de gauche à droite (de mémoire modulateur , linac, ring, diag,)

Les fréquences 25 10 5 hz sont dispo pour le linac

Diags completement instables SUBITEMENT il y a 10 minutes. Plus possible de continuer le shift. QQun  a-t-il fait qqchose de de lexterieur ???

mise en chauffe machine  => synchrro OK
=> frigo en marche => synchro OK
=> chiller en marche => synchro OK
=> alim linac en marche (I=0A)=> synchro OK
=> alim linac en marche (I = nominale) => synchro OK
=> alim TL en marche (I=0A)=> synchro OK
=> alim TL en marche (I = nominale) => synchro OK
=> alim RI-C1 en marche (I=0A)=> synchro OK
=> alim RI-C1 en marche (I=1A ou nominale)=> =PB Synchro apparait!!!
=> extinction Steerer RI-C1+dipole RI-C1-DP.01 => SYNCHO OK
=> extinction Steerer et QP  RI-C1 => Synchro OK
=> extinction RIC1-C2 SP03 => Synchro OK
=> extinction RIC1-C2 SP01 => Synchro OK
=> extinction RIC1-C2 SP02 => Synchro OK

dipole RI-C1-DP.01 perturbe la synchro quandcourant est à I=236A  (c'est reproductible)  (236A était la valeur enregistrée)

démarrage de toutes les alims (avec une recette anneau) sauf RI-C1-DP.01 => synchro OK

Le pb apparrait progressivement quand on augmente le courant (plutot régulier à partir de 200A) 

On va prendre un cafe et ensuite on va redemarrer la machine

Au redemarrage le probleme reapparait quand on met du courant dans dip_TL.

Test de toutes les alims dipole

Le pB synchro semble en fait lié aux courants délivrés par toutes les alims des dipoles (cf les screenshots des signaux sur bpmLI)
Je pense qu'il est beaucoup plus visible et frequent avec les dipoles ANNEAU car les 8 s'allument en meme temps

Test de l'alim SOLENO : idem probleme de synchro quand on va a fort courant (cf screenshot SOLENO)

Le dernier screenshot c'est :
Soleno OFF et tous les dipoles OFF sauf le EL_DP01 (qu'on ne peut pas eteindre sinon on n'a plus lautorisation de tir)

9h50 démarrage chauffage Klystron

la sortie d'urgence porte casemate a été appuyé ce matin.... ça bloque la ronde

16H... le timing a sauté pendant quelques secondes et est revenu tout seul
16H15 le 50Hz c'est mis à mal fonctionner ... replug des sondes dans le chassis (scope R&S 162.168.229.80)
tout refonctionne...

160pC à charge Max (67°)

Passage section : charge transmise a 100%
  * seulement pour SOLENO 220-230
  * qq soit l'alignement (section ou quads)
  * qq soit l'ouverture d'iris.

Sautes de faisceaux toujours presentes toutes les 2-3 minutes

Fin de shift.

Synchro OK pour demain matin

A 13h30 j'ai tent'e de faire un acces controle dans la casemate.

Quand j'ai pris la 1ere clef une alarme (son inhabituel) s'est declenchee au niveau de la fosse sud avec un chenillard rouge sur les verrines (fooses nord, sud et klystron).

J'ai appele le SPR comme explique hier.

Je suis tombe sur un repondeur...

Jean-Noel a tourne des clefs sur le PSS et l'alarme s'est arretee.

Plusieurs rondes sont tombees.

The load on client5 is 29 making all operations slow.

Appently the DS ThomX_PhotoCathode is using a lot of CPU, slowing the rest.

08h38 There is problem with the Linac modulator

08h55 Fixed with Maher help

09h45 Problem with vacuum in the septum. TL-V3 and EL-V1 are closed.

10h03 Fixed!

10h22 From time to time TO-V3 and EL-V1 close. Septum vacuum is 2.6e-10

08h21 Thomx Started: modulator, frig, laser

08h27 Chillers started, cycling all magnets

09h32 HV is 'ON'

09h34 Cannot control the section attenuator

09h50 The issue with the section attenuator was fixed: its server was shut down and restarted, but it was set to 0 dB!!

11h17 RF Gun phase 171 dg., Sect phase is 211 dg. Att. 2.62 dB, TL/BPM2 X=2mm, Charges (from BPMs at Att. 31 dB): -77pC, -77pC, -86pC . Linac steerere: H [1.03 -3.47], V [-1.88 2.63]

Contradictions with ICTs:  -87 pC, -73 pC, -80 pC

Beam in the ring

11h40 RCDS on injection receipt all_20250418_11_39_40, RF cav. at 100 kV, phase 16.5 dg., screanshots

12h03 Linac was reajusted. RF Gun phase is 166 dg., sect. phase is 210 dg. Att. 2.58 dB, TL/BPM2 X=3 mm RF cav. 100 kV, phase 13.5 dg. screenshots

12h10 Ring dipoles were changed from 160.4 A to 159.3 A, ring quads were adjusted and tune as well was set back to 0.17. TL/BPM2 X = 0. Screenshots 

12h25 RF Gun phase was adjusted to 161 dg.

15:24 Initial Synchro delay for streak camera: -6.60us. Injection at delay of +99.3e3us

Measurements incuding single shots

Study of the injection and of long decays with the streak camera, cf images. Horizontal scale is 2ms, vertical scale is 600ps.

Operating the streak camera create instabilities on the ring 500MHz that may cause phase problems.

16h47 RF Gun phase is 149 dg. RF cav. was at  200 kV, phase 10.5 dg.

17h26 Stop thomx

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

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

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

Tests des moteurs sur atténuateur en cours

Repérage des butées et des positions

Pas complètement au switch à 0.0 pas pour LI/HFI/ATT.02-MOT01

Travaux en cours à l'extérieur, le goudron sur le chemin a été enlevé, une pelleteuse bloque le passage vers ThomX, le passage est possible mais difficile

 For 22/11/2021

There is the remaining field from the dipoles in the TL. In order to go straight to the dump, the idea was to cycle the dipole to have 0 field. We have tried the cyclage given by the ALBA peopel/Cynthia. Total time ~ 17 min. After two cycling, the remaining filed alwayd stays at ~20 G.

After discussion of Jean-Noel with Fabrice Marteau, this turned out normal situation given the unipolar PS of the dipoles. The remaining filed is kind in agreement with B(I) found in excel files provided long time ago by Cynthia.

The information concerning the dipole cycling from Cynthia is attached.

23/11/2021

We would like to cycle the quadrupoles in the linac. The procedure of the cycling was provided by Cynhia (attached). 

The magnet current should be ramped from 0 to IMAX , decreased down 0 and ramped back to IMAX three more times. Measurement current will be finally reached going to nominal current ISet. (IMAX  = 12 A).  

Total cycling time is ~8 min [so ~1 min for 0 to IMAX, and the same for IMAX to 0). Waiting time at IMAX & I=0 is ~10 sec.

More probably this procedure is driven by the fact that the B(I) curves were provided for the positve values of I only I = 0..+12

As it was discussed with Cynthia: In order to set the negative current (defocusing quadrupole magnets), the  cycling procedure should be reversed. 

When the calibration curves [-12 A +12 A] will be available, the procedure has to be the following. The magnet current should be ramped from 0 to IMAX , decreased down to -IMAX and then ramped again up to IMAX. 

Measurement current will be finally reached going to nominal current ISet. (IMAX  = 12 A).  Total cycling time is ~6 min [so ~1 min for 0 to IMAX, and the same for IMAX to - IMAX). Waiting time at IMAX & I=0 is ~10 sec.

Figure attached: Quadrupole cycling layout given by Cynthia.

Figure attached: Quadrupole cycling layout in case of bipolar power supplies and corresponding calibration curves.

For the linac, to set the quadrupoles to 0, we can use the last procedure involving the + I max and -Imax (figures attached) and for later, we should discuss with Fabrice Marteau how we procceed. 

We made the cycling for the QUAD qnd still we have 5-10 G of the remaining field. To be understood....