Operateurs : EG, HG

but : travailler sur l'alignement de la tete de machine

Laser :

Spot pas bien défini, toujours probleme avec le hublot.

difficile d'utiliser la position moteur pour optimiser (aligner le laser) car pas reproductible. Il faut prendre la position du faisceau laser, et notre alignement sera donné en position du laser sur la fausse cathode.

L'amplitude du signal de la photodiode dépend de l'alignement du Laser (moteurs M4). L'amplitude du signal est maximum pour un laser aligné.

Les algo d'optimisations ne peuvent pas fonctionner, il faut donc passer par une méthode de fit sur des données :

• en faisant varier la phase autour du maximum de charge, nous faisons varier le déplacement du barycentre du faisceau (qu'on peut fitter avec une droite)
• Le but est de minimiser cette pente (en valeur absolue)

Redpitaya :

on a mis les signaux RF (Vincent) sur les Redpitaya ainsi que le signal de photodiode. Il faudra vérifier les voies pour que les étiquettes soient correctes.

Energie laser : 240 µJ en sortie Laser
Si la charge est basse il faut donc revoir la ligne de transport

- Energie en sortie de canon : Ekin = 4.71 MeV @ Energie Max (Phase = 269°)
- Transport section : Energy=49.82MeV (@110°)

13h: réalignement laser/photoCathode :
      *** plus de charge (max 150pC au lieu de 100 pC)
      *** profile de faisceau plus jolie (plus uniforme : pas de forme de sablier ou double faisceau)
===> verifier cathode

phase section 103° (1.2dB), phase canon (foc max -50°) 270° ==> energie : 50.92 MeV
 

07h50 Start ThomX

09h20 HV is 'ON'

09h25 HV  1215 V

09h52 RF Gun phase 234 dg. Att. 0.0 dB, Charge -110.0 pC; Sect. phase 208 dg., Att. 2.566 dB, TL/BPM2 X +2 mm

10h00 injection to the ring TL/BPM2 X -2 mm

10h02 Ring RF 100 kV

Today compared to yesterday shift the synchrotron oscillation amplitude is very unstable. Phase ? To be investigated.

First beam imaging with the MRSV.

 BBA studies

Horizontal plane

BPM3 (BPM.04-Lib.03) dX=1.1 mm

BPM9 (BPM.04-Lib.05) dX=0.8 mm

BPM5 (BPM.06-Lib.04) dX=0.2 mm

BPM11 (BPM.06-Lib.05) dX=-0.3 mm

BPM4 (BPM.05-Lib.04) dX=-0.3 mm

BPM10 (BPM.05-Lib.05) dX=1.2 mm

Set offsets on X in Liberas (OffX)

BPM.01-Lib.03, 130000+1800000 = 1930000

BPM.02-Lib.03, 70000+400000 = 470000

BPM.04-Lib.03, 40000+1100000 = 1140000

BPM.06-Lib.04, 30000+200000 = 230000

BPM.03-Lib.03, 60000+100000 = 160000

BPM.05-Lib.04, 130000-300000 = -170000

BPM.01-Lib.04, 300000+400000 = 700000

BPM.02-Lib.04, 70000+200000 =  270000

BPM.05-Lib.05, 140000+1200000 = 1340000

BPM.06-Lib.05, -20000-300000 = -320000

BPM.04-Lib.04, -50000+800000 = 750000

BPM.03-Lib.03, 60000+100000 = 160000

Vertical plane

BPM12 ri-c1/dg/bpm.01-lib.03 dY =  -2.4 mm

BPM1 ri-c1/dg/bpm.02-lib.03 dY = - 0.1 mm

BPM2 ri-c1/dg/bpm.03-lib.03 dY = - 0.5 mm

BPM3 ri-c1/dg/bpm.04-lib.03 dY = -0.2 mm

BPM4 ri-c1/dg/bpm.05-lib.04 dY = -1.0 mm

BPM5 ri-c1/dg/bpm.06-lib.04 dY = - 0.7 mm

BPM6 ri-c2/dg/bpm.01-lib.04 dY = - 1 mm

BPM7 ri-c2/dg/bpm.02-lib.04 dY = - 0.1 mm

BPM8 ri-c2/dg/bpm.03-lib.05 dY = -0.3 mm

BPM9 ri-c2/dg/bpm.04-lib.05 dY = -0.6 mm

BPM10 ri-c2/dg/bpm.05-lib.05 dY = + 0.3 mm

BPM11 ri-c2/dg/bpm.06-lib.05 dY = +0.5 mm

Set offsets on Y in Liberas (OffY)

BPM12 ri-c1/dg/bpm.01-lib.03 dY_new  = -300000 -2.4 mm  = -2700000

BPM1 ri-c1/dg/bpm.02-lib.03 dY_new = - 10000 - 0.1 mm = -110000

BPM2 ri-c1/dg/bpm.03-lib.03 dY_new = 105000 - 0.5 mm = -395000

BPM3 ri-c1/dg/bpm.04-lib.03 dY_new = 190000 -0.2 mm = -10000

BPM4 ri-c1/dg/bpm.05-lib.04 dY_new = - 110000  -1.0 mm =  -1110000

BPM5 ri-c1/dg/bpm.06-lib.04 dY_new = -100000 - 0.7 mm = -800000

BPM6 ri-c2/dg/bpm.01-lib.04 dY_new = -20000 - 1 mm = -980000

BPM7 ri-c2/dg/bpm.02-lib.04 dY_new = 150000 - 0.1 mm = 50000

BPM8 ri-c2/dg/bpm.03-lib.05 dY_new = 0 - 0.3 mm = -300000

BPM9 ri-c2/dg/bpm.04-lib.05 dY_new = - 90000 -0.6 mm =  -690000

BPM10 ri-c2/dg/bpm.05-lib.05 dY_new = 70000 + 0.3 mm =  370000

BPM11 ri-c2/dg/bpm.06-lib.05 dY_new = 10000 +0.5 mm = 510000

Studies in single trigget mode. See screenshots.

Beam is stored (sligth decay) in the ring around 15 minutes without touching anything. This opens way for beam dynamics studies and for better understanding of machine. Need to find a way to have diagnostics data  (trigger only diag) in such mode.

17h50 Stop ThomX

08h56 Warm-up ThomX: Modulator, Laser, Fridge
Chillers were started, cycling all magnets.
Low SF6 pressure.

10h20 HV ON

Tuning of the Linac. Charge at ICT1 is about 100 pC

Load the nominal receipt.

Modulator put to stand by. Lunch break.

13h16 HV ON

Application of the quadrupol calibration curve -12..12 A.

NEW

K1i_model =

   -1.5941
   -1.5941
   -1.5941
   -1.5941

K2i_model =

    3.2615
    3.2615
    3.2615
    3.2615

K3i_model =

   -6.1107
   -6.1107
   -6.1107
   -6.1107

K4i_model =

    5.4292
    5.4292
    5.4292
    5.4292

K5i_model =

   -3.5901
   -3.5901
   -3.5901
   -3.5901

K6i_model =

    2.3630
    2.3630
    2.3630
    2.3630

>> 
OLD
K1i_model =

   -1.5473
   -1.5473
   -1.5473
   -1.5473

K2i_model =

    3.1987
    3.1987
    3.1987
    3.1987

K3i_model =

   -6.0302
   -6.0302
   -6.0302
   -6.0302

K4i_model =

    5.3524
    5.3524
    5.3524
    5.3524

K5i_model =

   -3.5248
   -3.5248
   -3.5248
   -3.5248

K6i_model =

    2.3082
    2.3082
    2.3082
    2.3082

Machine-Model studies.

Nominal receipt

Before LOCO
=== dQ/dx comparison (axis: delta (dk*steps)) ===
Family    dQx/dx(M)      dQx/dx(T)      ratio     dQy/dx(M)      dQy/dx(T)      ratio
QP1     +4.975e-01  +5.370e-01   0.927   -3.362e-01  -4.067e-01   0.826
QP2     +7.289e-01  +8.119e-01   0.898   -2.407e-01  -2.830e-01   0.851
QP3     +2.198e-01  +2.420e-01   0.908   -9.850e-01  -6.102e-01   1.614
QP4     +1.026e+00  +1.136e+00   0.903   -2.736e-01  -2.968e-01   0.922
QP31    +6.600e-02  +7.543e-02   0.875   -2.357e+00  -1.288e+00   1.830
QP41    +5.350e-01  +6.000e-01   0.892   -1.024e+00  -5.563e-01   1.841

LOCO studies.

Checked that the first turn on which we inject now is 13-14th.

18h20 STOP THOMX

7h45: mise en chauffe en remote (modulateur, cyclage, laser, frigo/chillers)

08h43 HV is on

RF gun phase (laser phase) for maximum charge is out of the range, close to 360 dg. or 10 dg. Help is needed!

09h13 Kevin fixed it.

Stady of beam decay in the ring at different beam charges, streeck camera measurements, LOCO, vertical BBA attempt.

19h21 Stop ThomX

9h40: mise en chauffe (chillers/frigo, modulateur, cyclage)

HV ON

The ICT signal (GUN) is frozen. Need help to restart it. Use the BPM SpSum instead.

13h Beam in the ring.

RF gun phase 31 dg., Sect. att. 2.47 dB, Sect. phase 237 dg., charges (ICT): about -120 pC

17h16 ThomX stopped

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

08h40 HV ON

==> 50 MeV, Manual phase shifter value set to 3209. Sect. temperatute set to 30C at clarinette, (consigne = 29.2C).

Tune studies

LOCO

23h STOP ThomX
 

9:33 Start warming up

9:45 Ducre is working on the plumbing but it shuld not affect operations

11:00 Intervention JNC pour problemes refroidissement

12:00 Start beam

12:30 Sweeping of frequencies on RF cavity in ring, found local maxima at:

-500.0441MHz

-500.0371MHz

-500.0186MHz

Ring optimisation at 500.0186MHz

Slits position: 10mm/31.5mm (no improvement) => removed

16:30 Beam stop (access by Ducre)

Modulator left on standby, laser Gated, Magnets ON

Summary of the search:

Recipe used: all_20230516_15_45_01 (LI+TL+RI, all_recipes)

Attached plot shows ring at f=500.0202MHz.

RF Cavity: 45kV, fundamental = 114276mm; Plunger 15.420mm.

We ramped the cavity up to 50kV. Going from 40kV to 50 kV decreases orbit quality => some parameters still to be optimised.

Effect seen for:

RI/PS/DP: +/- 1A kills the beam. Changes by 0.1A can improve the beam.

RF cavity phase: acceptable values are on a wide range (-20degrees => +40 degrees) still very wide. We should probably set the cavity around +10 degrees (center of the range) begore increasing the voltage

RF Frequency: we had more than 100 turns in a band of about 10kHz

No effect seeing for:

injection steerers (no change in stored beam orbit)

Suggestion:

Try to optimise the quadrupoles with current settings

Then optimise the RF cavity phase (check that manual changes and software changes have similar effects) and ramp slowly the voltage.

10:00 Machine warm up

Magnets cycling

11:00 Start machine

Health check: problems with Red Pitaya and Vacuum

11:30 Scan charge phase: Charge too high (-118pC).

Laser attenuator was at 300mm => 295mm (-95pC)

RF section phase 112°

Attenuator 1.98dB

12:10 load recipe good_20230504_13_46_27

13:00 Intervention by Mohamed to start the cavity and record data points

16:42 Some storage at 500.3600MHz, Phase -30

17:15 Some storage at 500.3072MHz at Phase -29

17:20 Stop beam

Start of the machine by KD

11h20 The beam is in the ring

Optimization of the injection with the RCDS

Off-momentum injection from the injector

Based on the observation (attached here), it seems that there is a resonant excitation of the beam by the RF cavity. Difficult to scan with the dipole field.

=> The RF cavity should be checked and during the runs detuned.

=> Probably the priority to the RF cavity conditioning should be given to progress on the Ring comissioning

The BPM.04-LIB.03 (just before the FPC) gives a strange vertical orbit. This should be checked and further invetigated.

Test of the script to swotch off the machine by KD.

18h45 End of the shift

50 MeV

Configuration: good_20250123_17_53_01 "Working Point at 50 MeV for X_rays"

After RCDS optimization with X-rays good_20250124_15_05_25 "Updated WP with RCDS on X-rays 50 MeV "

Update from 14/02/2025 => Configuration: good_20250214_14_21_55 "50 MeV WP 120 um"

RF Frequency: 500.10045 MHz (33.XXXX MHz)

Vertical size of the interation region: 124 um =>laser beam size: 75 um (assumed); electron beam size : 99 um

Beam orbit:

BPM around IP

BPM3 ri-c1/dg/bpm.04-lib.03: x= 0.6 mm y = -2.87 mm

BPM4 ri-c1/dg/bpm.05-lib.04: x= 0.5 mm y = -2.96 mm

After RCDS

BPM3 ri-c1/dg/bpm.04-lib.03: x= 0.6 mm y = -0.18 mm

BPM4 ri-c1/dg/bpm.05-lib.04: x= 0.3 mm y = 1.88 mm

RF gun 231 deg. Sect. Att. set to 2.43 dB, Sect. phase is 209 dg. TL/DP current set to 159.3 A, Linac steerers H [1.16 -3.2], V [-2.25 2.86] ; TL BPM2 x =  mm

Run with FPC P= 89 kW

X-ray intensity (synchronized mode): max 50000 pA ~2-3x10^10 ph/s

61.5 MeV

Configuration: good_20250214_16_29_22 "61.5 WP 177 um"

RF Frequency: 500.04545 MHz (33.XXXX MHz)

70 MeV

RF Frequency: 500.03165 MHz (33.XXXX MHz)

Att 0.3 dB

40 MeV

40 MeV. Sect. Att. set to 4.095 dB, Sect. phase is 205 dg. TL/DP current set to 125.38 A, Linac steerers H [1.19 -3.25], V [-3.05 3.47]

TL BPM 20= -2 mm

RF cavity 50 kV, Freq=500.11896 MHz

RF Frequency: 500.11851 MHz (33.341230 MHz)

Vert FPC scan : IP region 0.199 um

X ray flux asynch I3 ~ 370 pA (background level 310-315 pA)

43.7 MeV

RF gun 162 deg. Sect. Att. set to 3.51 dB, Sect. phase is 210 dg. TL/DP current set to 136.95 A, Linac steerers H [0.44 -2.77], V [-2.36 2.87]

TL BPM 20= -1.5 mm

RF Frequency: 500.1189 MHz

35 MeV

RF gun 162 deg. Sect. Att. set to 4.98 dB, Sect. phase is 202 dg. TL/DP current set to 111.3 A, Linac steerers H [], V []

TL BPM 20= -1.5 mm

RF Frequency: 500.1189 MHz

Goals:

- Work on the BLM to have the signals at the injection and from the arc in the ring.

- Study on the ring injection and beam storage at higher beam charge. Check the linearity.

09h35 Thomx was started: modulator, frig, laser

09h41 Chilers were started, all magnets cycling

10h47 HV is 'ON'

10h57 Hv is 'OFF', Access to the bunker

12h10 HVis 'ON'

RF gun phase was set to 198 dg., sect phase 206 dg., Sect Att. 2.62 dB, Chgarges: -59 pC, -59 pC, -64 pC, laser att.  270

13h13 Unable to get the beam into the ring. Change kickers back.

14h40 HV is 'OFF', Access to the bunker to check/reconnect the BLM

The "Extraction" kicker did not allow to store the beam. Maher exchanged the kicker PS back.

Restart. Ring tuning is OK.

Gradual increase of the charge from the RF gun. Tuning and measurements of the charge in the ring (integral of the TbT sum signal @2k turns). Please, see the plot attached.

We made 4 points. For each one, the solenoid, TL quaqrupoles and steering and injection were changed by looking at the BLM signal (ring injection). Ring kept unchanged.

A special attention should be given to the transport efficiency (and emittance), when increasing the charge.

18h Stop THOMX

Shift consacré à la calibration des moniteurs de pertes ainsi qu'à l'allignement de la tete de machine (Laser + Solénoide)

•  Solénoide :

  • cables de l'encodeur des moteurs LI/AE/COL.01(02)-MOT.01 étaient intervertis, sont maintenant bien rebranchés

  • Demain : il faudra vérifer le mouvements correspondant aux pas moteur 

• BLM : 
  • Signal BLM étudié sur scope 
  • Signaux montrant les positions de l'entrée de la section et du 1er yag (A confirmer demain) 

Tests RFs réalisés : difficultés avec le signal du réfléchi, la forme du signal est étrange.

Nous sommes passés de 500 ns à 2us de largeur de pulse.

Boite C mise en place sur le coupleur mais le signal n'est toujours pas celui attendu

Consigne en température modifiée de 28 à 35 degres sur les différents signaux obtenus et pas de modification significative du signal.

HT = 780 V

Pour l'instant il semble que l'on ne soit pas adapté, malgré les différentes mesures (S11 = -3.202 dB), reflexion quasi totale

Prise de donnees axe Q1Q3 du 14/01

Steerers  Axe q1q3     : str1[H V] = [2.45 -1.83]  
                                      str2 [H V]=[-4.43 2.22]
               Axe section : str1[H V] = [1.50 -3.30]
                                      str2 [H V]=[-3.83 4.16]
                                     (section pas bien alignee du tout ... valeurs des steerers = melanges de align_standard et de xopt  elog_917 19/09/2024)

Prise de donnees axe Q1Q3 du 15/01 apres tout de cle q1q3 par Alex G. : le but etait de "pousser Q3 vers le MUR"

Steerers Axe q1q3     : str1[H V] = [2.62 -2.06]
                                     str2 [H V]=[-4.52 2.43]
              Axe section : idem que 14/01

CONCLUSION :
     Axes reconstruits en pj --> Le tour de cle a ete fait dans le mauvais sens (Q3 a ete pousse vers l'anneau ...)
     Confirme apres discussion Alex
     Et confirme aussi en faisceau : les quads de la TL semblaient apres le tour de cle encore plus desalignes qu'avant par rapport a q1q3 ...

A refaire sem pro dans le bon sens

Restauration de la base de donnée TANGO faite aujourd'hui.

Tests des DSs prévus demain matin. Redémarrage des DSs nécessaires avant via astor.

~9h Start of the modulator

10h Tuning of the injector with KD

11h Try to inject in the ring. Only 1-2 turns after optimization. We tried previous injector settings, the situation is the same. We retuned the injector based on our previous experience with

Isolenoid = 234 ->220 A,

Laser phase = 289 -> 288 

LIL phase = 114 -> 110 (Att = 2.04 dB)

Settings are saved.

We found that the injection kicker timing was not good (-7.19 us). We put the previous setting -7.23 us

Problem to start RF Cavity. IP adress problem . A lot of Debug with Jean Noel. Working when not connected to THomx network. Philip is informed.

Machine stay in standby till tomorrow. 

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. 

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

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.