7h55: mise en chauffe à distance (modulateur, frigo/chiller, laser, cyclage)

Problème de trigger : tout le monde est à 12.5Hz sauf le trig diag à 6.25Hz (signal de trig en entrée des générateurs de délais) ==> problème CPLD/code

*** programme ***

* déploiement stabilistation phase laser

* mesure MRSV + X-ray

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

Goal: Beam Loss Monitors and Ring injection at high charge. Studies of the injector for high charge. Emittance measurements.

08h33 ThomX was started: modulator,frig, laser

08h40 Chilers were started, all magnets cycling

11h05 HV is 'ON'

11h15 RF Gun phase 194 dg. laser att. 280, Gun charge -100 pC.  Breakdowns in the RF gun

12h14 Breakdowns in the RF gun. Vacuum interlocks. Drop HV to 1210.

12h30 Restore HV

Increase of the charge from 100 pc to 450 pC. Tuning of the injector and ring injection. We suceeed to minilize the injection losses for the high chege. After our studies,  the charge in the ring incresed proportinally to the charge in the linac measured with the BPM.

The recettes were saved in the folder REFERENCES

50MeV_450pC_BLMRCDS_Ratio1_20250527_15_12_22 (best storage with min losses)

15h50 RF gun phase 190 dg., Sect. phase 206 dg., sect. Att. 2.61 dB, Laser Att. 420, Charges (BPMs): -451 pC, -451 pC, 437 pC, Sum(TBTSum = 5.4e11). Receipt: 50MeV_450pC_BLMRCDS_Ratio1_20250527_15_12_22

Emittanse mesurement with QP3 (Isol=235 A)

beta x = 5.0264 alpha x = -1.5425 Horizontal normalized emittance 11.6 mm*mrad

beta y = 7.8251 alpha y = -3.0341, Vertical normalized emittance 7.9 mm*mrad

16h35 RF gun phase 184 dg., Sect. phase 204 dg., sect. Att. 2.69 dB, Laser Att. 303, Charges (BPMs): -219 pC, -216 pC, 240 pC, Sum(TBTSum = 3e11). Receipt: 50MeV_450pC_BLMRCDS_Ratio1_20250527_15_12_22

Emittanse mesurement with QP3 (Isol=235 A)

beta x = 51.2017 alpha x = -15.6429, Horizontal normalized emittance 1.1 mm*mrad

beta y = 5.7487 alpha y = -2.2848, Vertical normalized emittance 4.5 mm*mrad

08h00 ThomX was started

Goals: Emittance measurements, ring optics study

10h00 HV was 'ON'

RF Gun phase 240 dg. (the previous day was 190 dg.), Sect. Att. 2.42 dB (the previous day was 2.61 dB) Laser Att. 280, Charge -106 pC

Emittance measurements vs RF Gun phase for 109 pC, 208 pC, 360 pC

Ring optics study.

17h20 ThomX was stopped.

8h: mise en chauffe à distance (modulateur, frigo/chiller, laser, cyclage)

8h10: mise en chauffe à distance (modulateur, laser, frigo/chiller, cyclage)

  * le cylcage plante toujours autan (redémarrage de l'IHM après allumage des aimants et à la moitier du cyclage des aimants)

** Mise en place de la mesure de phase laser **

- le programme se lance automatiquement sur la redpitaya en salle laser

- Le DS est sous Astor il tourne sous SRV-7

- l'IHM permet de faire une calibration (conversion de la lecture en degrée de phase 500MHz et setting des points du feedback)

- il permet de lancer l'acquistion de la phase laser (avec setting de la correction au début) 

- il permet de lancer le feedback

*** (cf. signaux de phase) le problème vient de la précision de la mesure. Lors des tests le signal était beaucoup plus beau qu'a présent. Nous devons travailler sur le signal pour avoir une rétroaction efficace (qui ne perturbe pas le faisceau). 

Goals: Optimization of the IP. Verification of the llaser waist position and electron beam angle wrt. collision plane.

08h25 ThomX was started; Modulator, Frig, Laser

09h30 Chillers were started, cycling all magnets

RI-C1/PS/STR.06-H.01 is out of order. Fixed with the health check by killing the device server.

09h58 HV is 'ON'

10h20 RF Gun phase is 162 dg., Linac steerers H [0.52 -2.73], V [-228 2.70], Sect. phase is 211 dg.,  Sect. Att. is 2.55 dB, TL/BPM02 X=0, Charges (BPMs): - 111 pC, -111 pC, -123 pC, -123 pC

Receipt from 04/06/2025 17h11

10h29 Beam transported to the ring

10h30 The ring RF cavity did not start due to interlock on  Pi, Pr, RF. Fixed

11h - 14h Optimization of the ring by using also MRSV. We have arrived @MRSV to the sigma_x = 16.4 pixels and sigma_y = 13.5 pixels.1 pixel = 41 um.

14h Operation with X-rays

We started withthe flux of 50 pA and optimize it till 350 pA (sometimes up to 400 pA). The vertical orbit is attached. The X-ray flux depends strongly on the tuning of the Linac and TL + injection. During the optimization we do not modify the Ring elements. By changing the vertical corrector in the TL, the flux was increased by 100 pA. To be understood.

The injected charge in the ring shows slow oscillations, same as the ICT signals in TL (see screenshots). From time to time the injection/charge starts to jump, sources (similar situation is with FPC laser)

Start of the vertical and horizontal scans. initial pos_Y   = -1.24 mm

With these data we get ANGLE =  5.1 mrad

With the vert orbit Ring BPM we calculated the following:  BPM3 =-2.62 mm pos. 3.93 m and BPM4 = 2.99 mm pos 5.074 m => ANGLE = 4.9 mrad

Very good agreement given the precision of the measurements.

Stability of the injector is very important during these measurements.

We made the quasi flat vertical orbit around IP ANGLE 0.09 mrad. As for now, for this vert. orbit, the flux is 3 times lower ~110-120 pA, despite different scans and attempts to inclrease it. Apparently, vert. orbit in SEXT is very important and in current configuration should be offset.

19h STOP THOMX

Astra simulation of the phase charge scan (see figure) shows that this is a convolution of the electron bunch generated by the laser pulse, since electrons cannot be generated at the negative field at the cathode. Therefore, the zero crossing is a cutting edge. The maximum acceleration corresponds to 48.5 degrees. 

From the phase charge scan (see figures): Sigma1=1/0.462/1.4=1.5 dg. (morning), Sigma2=1/0.337/1.4=2.1 dg. (evening). But it seems that last one has satellite bunch.

08h15 ThomX was started; Modulator, Frig, Laser

08h21 Chillers were started, cycling all magnets

09h40 HV is 'ON'

Scans of phase charge were performed

10h22 Beam in the ring, receipt from 20250605_17_33_45. Linac steerers: H [0.36 -2.55], V [-2.36 2.66], Phases: RF Gun  165 dg., Sect. 214 dg., Sect Att. 2.6, TL/BPM2 X=0, Charges (BPMs): -114 pC, -113 pC,  -125 pC, -125 pC

MRSV: Hor. Std = 19.2812 pix, Vert. Std = 13.8814 pix

11h40 Going to 70 MeV. Sect. Att. 0.228, Phase 237 dg., RF Gun Phase 150 dg.

At F RF cavity 500.0328 MHz interlock on water cooling. Fixed by JN.

Trying to find horizontal tune.

At 70 MeV the MRSV camera saturated.

Work on the orbit correction.

Vertical scan with FPC. Sigma _y = 

The receipy is saved and can be used for the spectrum measurements. Further studies to be continued if needed.

FPC Table Vertical Scan: sigma Y =132 um

17h02 Stop ThomX

phi max :  220 deg Qmax = 120 pC

Laser new position : 4.714 / 3.524

zPhiS=215   AttS=2.58 dB

Emittance measured at QP3 and QP7 (different phase for section)

Data saved for ML :  /media/operateur.thomx/Ultra\ Touch/ThomX_Data/data_linac_10_06_2025/
 

Stop : 18h45

8h10: mise en chauffe à distance (modulateur, frigo/chiller, cyclage aimant, laser)

Programme: Nouvelle prise de donnees Spectres Echantillon Bazin

08h40 ThomX was started: Modulator, Frig, Laser

08h45 Chillers were started, cycling all magnets

09h56 HV is 'ON'

10h14 There is problem with Wavecatchers (see screenshot). Even dark current is absent

Wave catcher power supply 2 (5V) is dead... changed temporaly with a spare. (solved)

There is problem with the section phase shifter

12h10 All problem fixed, beam in the ring 50 MeV

Going to 40 MeV

13h25 Sect. Att. 4.03 dB, Phase 203 dg., RF Gun phase 166 dg. Charge -85 pC, receipt 20250613_13_25

Going to 43.7 MeV

14h20 Sect. Att. 3.5 dB, Phase 210 dg., Gun phase 162 dg  TL/BPM2 X=-1.5 mm, Receipt 20250613_14_19_57

16h00 35 MeV. Sect Att. 4.98 dB, phase 202 dg. Receipt for the linac 

16h10 HV  on standby Access to the bunker

• Phi Qmax ; 324° : Phi Emax : 274°
• Qmax : 70-80 pC (Att : 290°) and 300 pC (Att : 420°)
• Recipt : 50MeV_100pC_20250527_14_10_19.txt
• Att Section : 2.45 dB, phi min disp : 209°
• Quad align done

13h20 : Pause

13h30 ND operateur.

Acces controle

Alignement ligne streak linac

14h50 Laser alignement.

Travail sur chassis laser en cours et prioritaire.

Allumage kicker injection

La voie 19 du generateur de retrad des diags etait toujurs connectee au scope avec le smemes regalges que la voie 8.

On remet les wavecatcher sur les reglages anterieurs.

15h40

img5=HV

img6=Trig

Beam ON

On observe pas de probleme sur les ICT.

Charge IC22 / ICT3 non lue soucis WC ...  ? On regarde Spsum sur BPM pour voir que la charge reste constante, les positions sur TLBPM2 ne bougent pas ( X=0.1 Y =2)

Trend de la phase

pas de mesure de longueur aujourd'hui

Quelques mesure

Goal: bunch length measurement in the transfert line to improve the model. Parameters to vary : phase (Section) , charge, laser size (? should not play a role), laser length (see with Viktor)

8h: mise en chauffe en remote (frigo/chiller, modulateur, laser, cyclage)

*** Programme *** 

- mise en route du feedback longitudinal 

- prise de donnée phase laser

Beam tuning of the injector and Ring

Measurement of the synchrotron frequency (model freq 234.21 kHz at 150 kV)

with 200 injections:

Amplitude deviation = 33.9911%
Frequency deviation = 0.48116% (269.5504 kHz)
Phase deviation = 140.4079 degrees
Average position deviation = 0.96329%

This frequency is given to Mohamed to configure the FBL.

In 1h we remeasure the frequency

Amplitude deviation = 36.5824%
Frequency deviation = 1.1559% (266.9823 kHz)
Phase deviation = 148.368 degrees
Average position deviation = 1.0323%

8h20: mise en chauffe en remote (frigo/chiller, modulateur, laser, Cyclage)

IHM cyclage plante toujours au tant.

9h45 : Mise en route. Rechargement de la recette de référence d'hier : "50MeV_100pC_20250619_16_39_12"

Après réglage de la phase Canon + Linac (atténuateur + phase) ==> stockage immédiat sans perte sur les fibres

** Gros courant I3 de rayons X, /!\ la calibration (courant/flux) n'est plus bonne (cf. prochain point)

** Le faisceau est fortement en haut du tube faisceau dans la ligne X ==> problème de trajectoire ==> influence sur I3

18h30 : fin de shift

*** Programme ***

Test monochromateur :

- En fermant les fentes autour du monochromateur, on voit apparaitre la réflexion

- prise de spectre à différent angle mono sur la réflexion 

- problème au niveau de la recherche du centre faisceau (compensation entre déplacement et angle mono) ==> à investiguer. 

---- à faire :

- analyse des spectres et mise au point d'une procédure pour trouver le centre du monochromateur

- recalibration de la diode I3

- trouver le paramètre corrélé à la baisse de flux (nous avions activé le feedback laser + phase Laser + injection section) 

Sur toute la journée la phase Laser à bougé de quelques degrés de phase (3 degrés environs), mais la phase section a du etre rattrapé de plus (pratiquement 10deg)

*** Infos prises de données ***

image faisceau :

- Threshold 30keV : image_00266, image_00268, image_00269

- Threshold 45keV : image_00271, image_00272 (centrée sur la caméra)

Image Mono :

- à refaire, il faut faire attention au fait que le faisceau est réfléchi par le mono (donc l'image du faisceau est décalée).

New laser position :

5.041
4.448

Charge : 1.3 mm Iris + 420 Attenuation : 500 pC (Qmax)

Goal: Vertical orbit and angle at the IP with I3 and I4 X-ray signals

8h55 Switch ON the modulator and all the machine

Camera SST2 : impossible de changer le temps d'expo    and SST3 not started

• Phase max Q = 333° with Q = 130 pC
• Phase Sec : 203°  and Att = 2.46 dB
• Aligned quads

With the previously saved receipt, the injection and charge of the stored beam was quite bad. We tried several receipts. We tried to tune the ring till ~16h.

The FPC was operated in synchronous mode with the power twice less as typical value.

The TL transport was different from previously used. We should try to keep the same orbit in the TL for reproducibility. 

The FPC scan showed the two peaks structure => to be understood.

Then, we re-loaded the lattice from folder Reference (changed the laser position @photocathode). With the energy-phase adjustments we arrived to the resonable conditions. The FPC scan is attached.

Both I3 and I4 were recorded/displayed during the shift. In this configuraiton, the X-ray signal was mainly maximized and I3 ~7k-8k pA (I4~ a few hundreds of pA).

The vertical orbit was modifief to have zero angle at the IP. See the plot attached. 

In this configuraiton, the X-ray signal was almost equally shared between I3 and I4 ~ 1k pA.

A proper conditions and FoM should be defined for further optimization procedures. 

18h15 STOP THOMX

8h15: mise en chauffe distance (chiller/frigo, modulateur, laser, cyclage)

9h45: modulateur ok  

Attenuateur laser à 270 => Qict1 = 100pC
iris 1.3mm
recette "50MHz flat"
optimisation Qpole LI (scrip spider)
faire un reset ckiker extraction en local
asservissemnt phase Laser PC Li 500MHz on
asservissemnent position injection linac (script spider) (cd /data/shared/commissioning_scripts/Linac/Alignements/python ./feedback_linac_injection.py )
injection dans l'anneau avec  FBL power RF 150KV

diag :
192.1668.229.22 perte injection
taurusplot r1-c2/dg/BPM.03-li

Avec recette FLAT et FPC 21 kW - 50 MeV
   Mesures
     ** flux diode calib
             signal tres bruite (pas possible d'entrer dans la X-hutch pour checker connexion car shutter bloque ouvert pb PSS)
     **  spectre : toujours pas de procedure pour trouver le on-axis ... Simu pour comprendre
     **  taille source fente 1 + photonic (image MRSV prise pour comparaison)

Vérif position laser photocathode :

--> bouge de 1mm en Y et 0.2 en X

Nouvelle position:

• 5.003
• 4.553

--> bouge de <0.3 en X et 0 en Y. 

Qmax : 321°
Emax : 271°

Quad Align :

• 'steerers : ',  li/ps/str.01-h, v    1.0406, -2.4368
• 'steerers : ',  li/ps/str.02-h, v    -3.2289, 2.8844

8h05: mise en chauffe en remote (frigo/chiller, laser, modulateur, cyclage)

9h: problème avec le DEG04 (pas de trig),  la lumière de la PLL est rouge (post synchro) ==> il faut redémarrer et réactiver les voies en "EXT" via l'interface web (interface IHM ne fonctionne pas) (IP: 192.168.229.124)

Attention changement de fréquence 500MHz ring => changement de phase 33MHz obligatoire pour pas avoir de saute de synchro(spider Write_Phase RIGOL_33MHz.py)

10h :

- Chargement de la recette "/data/shared/recipes/saved/References/61p5MeV_20250331_18_08_02.txt"

- ajustement atténuation (1.07dB) 

- alignement dans les quads

- injection dans l'anneau immédiate ==> tune de la phase au déphaseur phase RF manuelle, on passe de 449X° à 344X°

11h: injection dans la ligne d'extraction (le kicker semble ne pas sauter), gros bruit au niveau de SpX de EL/BPM.01 ==> mise à jour recette 61.5MeV dans le dossier de référence

12h: ajustement de la CFP ==> il y a des rayons X

- prise de spectre

- prise image pour mesure de taille faisceau

*** programme ***

test rayons X à 70keV (61.5MeV)
 

8h: mise en chauffe en remote (frigo/chiller, modulateur, laser, cyclage)

9h14: Demarrage faisceau

9h45: Faisceau dans l'anneau

Efficacite stockage anneau: 98%

10h20: Optimisation retard kicker ext: -7.5610

10h30: Insertion fentes TL/DG/SRH

Position sans affecter le faisceau dans l' anneau: 19.5mm / 24mm

12h18: Acces pour reinitialiser un controleur de moteur.

12h30 Redemarrage

14h37 Reprise de la phase RF vs laser

??? Stop ThomX

**** Programme ****

1) Prise de données rayons X pour manip de dosimétrie (61.5MeV)