Aujourd'hui (09/06/2023), la Table1 de la ligne X est mise en position faisceau. Je l'ai approximativement alignée dans le faisceau. 

Le cablage du pico1 (XLI/OP/TMD.01) est le suivant :

- ch1: diode écran fluo (XLI/OP/TMD.01/I1)

- ch2: non connecté ==> bouchon (XLI/OP/TMD.01/I2)

- ch3: 1e diode détecteur à diode (XLI/OP/TMD.01/I3)

- ch4: 2e diode détecteur à diode (XLI/OP/TMD.01/I4)

La valeur des attributs ci-dessus est en pA,

le temps d'intégration est 50ms (ITM en 100us ==> 500 = 50ms),

le gain est réglé à 1 (50pC) et 0 (2nC) pour les ch1/2 et ch3/4 respectivement (cf P.J.).

La fenetre jive du pico est en P.J.

attention au polling des attribut qui est sur 1s.

Attention les pico ne sont pas trigger pour le moment !

Tout est pret pour chercher les X.

hier et ce matin la ligne a été re-réglé.

La table optique a été déplacé d'environ 1cm vers le canon pour s'aligner un peu mieu à la sortie CFP.

L'écran fluo a été inséré dans le faisceau lundi. Seul la voie 1 du pico sera donc utile pour la détection.

Le pico a été reréglé avec les paramètres suivants :

le temps d'intégration est 500ms (ITM en 100us ==> 5000 = 500ms),

le gain est réglé à 4 (200pC) et 0 (2nC) pour les ch1/2 et ch3/4 respectivement.

le polling est de 100ms

le mode Half est retiré ce qui peu engendrer du bruit d'une mesure sur 2 (1 acquistion par ADC) mais augmente le nombre d'acquisition par seconde.

Excitation (betatron oscillation) on the beam observed by exciting it with the extraction kicker => initial measures of the tune.

Tune measured close from expected value.

Reason for oscillation damping is not understood.

The attenatuator of the RF section has to be tuned from time to time to keep the beam energy (beam position on TL/BPM.02).

Energy tolerance of the ring lattice: +/- 1% (but this may affect the transport upstram in the TL).

Next steps:

- Measure oscillations at different cavity power to see how they are affected.

Notes from last week:

• Beam was very unstable (probably energy instabilities), lot of time was spent tuning the injector.
• Beam instabilities prevented us from having a good storage.
• Unable to start the extraction line dipole.

Comments:

• It seems too early to plan radioprotection checks as:
  • we have not yet been able to store the beam and then extract it in a working extraction line.
  • beam is too unstable.
• Beam instabilities prevent progress on the ring studies.
• Beam stability characterisation of the upstream parts of the accelerator are necessary.

Report from last week:

- Attempted the strategy suggested by Alex

- Comparison of orbit with RF ON and RF OFF helped understand the "natural" frequency of the ring: 500.33MHz

- Attempts to store at 500.22MHz did not sicceed. Storage at 500.27MHz.

Goals for this week:

- Beam on Thursday and Friday

- Work on BBA (IC, VK, VM) + extraction and BPMs (ND, LS)

- Measure below deformation

Comments:

* There are strong evidences that part of the frequency problem comes from mechanical issue

* Fring field of the dipoles seems to be longer than anticipated. This could lead to shortening of the orbit.

Decisions:

* Have a meeting with mechanics to understand what are the issues and what are the possibilities to address the ring length issue.

* CFP is welcome to operate *remotely* during ring operations. A script will be made to monitor the X-ray flux during operations.

* Wednesday, Thursday and Friday : CFP can access until 11h.

* Investigate the operation of the BLM.

* Tuesday afternoon Nicolas and Sophie will investigate the feedback issue (phase or attenuator to stabilize TL/BPM.02/SpX).

Plan for this week: prepare the beam to test the X-ray production.

- Went up to 100kV in the cavity once it was tuned.

- Achieved nice storage stable for 2500 turns and some beam for > 100ms

- Measured the tune: several peaks around 0.35[1] (near the expected value) and one peak not understood at 0.5

- We observed storage at different frequencies spaced by about 10kHz

- Shall we try to return close from the nominal frequency?

Current status wrt to X-ray search:

- First we need to be able to reach reproducable storage from day to day

- X-ray searches can be started parasitically when the beam is stored

- Better understanding of the beam will come through measurements (at least until the summer): precise measurements of optics, beam parameters will be possible only with repeatable operations. This is crucial to reach the target parameters of the ring.

Next steps:

- This week (Friday afternoon - if beam available): try to reproduce results from last Friday; store, study injection, dispersion

- Next week: Thursday continue work on reproducibility; Friday 31st: scan in frequency starting from nominal frequency at lower voltage.

This entry is to be updated as the work progresses.

1) Re-establish beam transport to ring

2) Scan in time the septum

see script git/panneaux/Synchro/scan_septum.py

3) Scan in voltage the septum

4) Adjust timing of kicker by looking at induced noise on ICTs

5) Scan in time the kicker

git/panneaux/Synchro/scan_kicker.py

6) Scan in voltage the kicker

7) Transport further in the ring by playing with correctors

Note: When possible Alexandre will test his feedback code.

(1),  (2), (4) and (5) from last week have been done other items in progress.

New to do list:

(0) Re-establish beam transport to ring

(1) Monitor incident power on RF Gun

(2) Check energy jitter in TL/BPM.02 and TL/SST.02

(3) Use TL optimised transport when available

(4) Compare single pass and TbT BPM signals

(5) Test Alexandre's feedback code.

(6) Scan correctors to increase current on RI-C1/BPM.01 and RI-C2/BPM.06

(7) Start align beam in quadrupoles
 

New to do list:

(0) Re-establish beam transport to ring

(0bis) Check energy jitter in TL/BPM.02 and TL/SST.02

(1) Try to merge TL optimised transport with ring injection transport => record beam size on TL/SST3 and position on TL/BPM.03 and TL/BPM.04 for current ring transport

(2) Reduce betatron oscillations

(3) Measure and correct orbits

(4) Measure Tune

(5) BBA

(6) Improve charge transport at injection

(7) Start MRSV

To do list:

(0) Re-establish beam transport to ring

(0bis) Check energy jitter in TL/BPM.02 and TL/SST.02

(0ter) Measure emittance on TL/SST.03

(1) Try to merge TL optimised transport with ring injection transport => record beam size on TL/SST3 and position on TL/BPM.03 and TL/BPM.04 for current ring transport

(2) Improve charge transport at injection

(3) Measure and correct orbits

(4) Start MRSV

(5) Measure Tune

Status slides presented by Iryna available on indico at https://indico.ijclab.in2p3.fr/event/8749/

The beam parameters required for a good injection in the ring were discussed.

The following required parameters were identified:

- At least 80pC on TL/DG/ICT.01

- At least 20pC on TL/DG/ICT.02

- Energy in the TL must be checked and must be 50 MeV.

- Beam position must be checked on TL/DG/SST.01, TL/DG/SST.02 and TL/DG/SST.03 and be within the acceptance (see tickbox acceptance on IHM_SST).

- Beam size must be measured on TL/DG/SST.03 and be < 2mm FWHM

- Beam recipes for the LI and for the TL must be saved.

- Health check must be checked (no red entry).

- Beam centered on the last quadrupole of the transfer line.

ACTION: Nicolas will create an interface that displays as many as possible of the required parameters.

Suggestion by Viktor: check phase noise at the gun entrance: there might a phase noise issue.

=> Vincent (VC) is going to do that with Viktor (VI) during RF studies on 26th September

Planning for the coming week:

- Wednesday: Slava (+Iryna after the CoDEC)

- Thursday: Nicolas + all

- Friday: AG Pole. Alexandre and Vincent plus Slava

Current objectives:

1) Re-establish beam transport to ring

2) Scan in time the septum

3) Scan in voltage the septum

4) Adjust timing of kicker by looking at induced noise on ICTs

5) Scan in time the kicker

6) Scan in voltage the kicker

7) Transport further in the ring by playing with correctors

Note: When possible Alexandre will test his feedback code.

Shift summaries for the ring for last week are at

https://elog.lal.in2p3.fr/THOMX/Commissionning/568

https://elog.lal.in2p3.fr/THOMX/Commissionning/570

https://elog.lal.in2p3.fr/THOMX/Commissionning/571

The problem with the pulse jumpis with 12ns delays has been identified and fixed (it was related to the synchronisation system).

The main issue identified last week is a problem with RI-C2/PS/QP.09, RI-C2/PS/QP.10 and RI-C2/PS/QP.12 which has been addressed after the meeting (see https://elog.lal.in2p3.fr/THOMX/Commissionning/572).

It is important that the laser energy and linac beam charge are checked and optimised every week.

=== Summary of last week:

- Frequency was reduced to 500.0202MHz but the beam stayed only for 100s of turns

- Good storage was achieved at 500.40MHz:

* Study of the effect of beam energy (linac section attenuator) on the orbit

* first attempts of BBA

=== Measures to do

Thursday: goal store at 500.0202MHz

- Use a spectrum analyser to check the FFT of the BPM electrodes as function of dipole current (Nicolas)

- Scan RF cavity (phase + plunger) at 500.0202MHz (Lisa+ Nicolas)

- check BPM convention (Lisa)

- Adjust beam energy (linac section attenuator and phase) to adjust ring frequency

Friday: Goal increase cavity voltage

- Orbit correction (BBA+SVD) (Iryna + Slava)

- Measure momentum compaction factor

The following parameters are required for ring operations:

- At least 50pC on TL/DG/ICT.01 with std <20pC

- At least 20pC on TL/DG/ICT.02 with std <20pC

- Energy in the TL must be checked and must be 50 MeV =>  TL/BPM.02 SpX, SpY <1mm  with Std(SpX, SpY) <1mm with nominal value for TL/PS/DP.01

- Beam position must be checked on TL/DG/SST.01, TL/DG/SST.02 and TL/DG/SST.03 and be within the acceptance (see tickbox acceptance on IHM_SST).

- Beam size must be measured on TL/DG/SST.03 and be < 2mm FWHM

- Beam recipes for the LI and for the TL must be saved.

- Health check must be checked (no red entry).

- Beam centered on the last quadrupoles of the transfer line.

This list will evolve as we progress in the ring commissioning.

Pour info :

• client 1 ne fonctionne pas encore. Il n'a pas été utilisé depuis longtemps, Guillaume a été prévenu pour y jeter un oeil.
• Client 3 et 5 sont maintenant aux places qui n'ont qu'un seul écran. Une MAJ de la salle devra être faite pour
  • déplacer l'écran de sécu sur une autre table dans un angle (fond gauche ou droit)
  • mettre soit 4 écrans / soit un grand écran aux autres machines (excepté celui de la table CC)
    • Il faudra s'assurer que les écrans de grande taille puisse se mettre sur la table (attache)

1. CALC/DG/MeanStd_charge1/ER_CA_rac.05-elr.01-WAC.03_Ch0_chargeMean
2. CALC/DG/MeanStd_charge1/ER_CA_rac.05-elr.01-WAC.01_Ch0_chargeMean
3. CALC/DG/MeanStd_charge1/ER_CA_rac.05-elr.01-WAC.02_Ch0_chargeMean
4. CALC/DG/MeanStd_charge1/ER_CA_rac.05-elr.01-WAC.02_Ch3_chargeMean
5. CALC/DG/MeanStd_charge1/ER_CA_rac.05-elr.01-WAC.02_Ch4_chargeMean

Dans les variables MeanStd :

• Charge 1 :
  • er_ca_rac.05-elr.01-wac.01_Ch0_chargeMean 
• Charge 2 :
  • er_ca_rac.05-elr.01-wac.02_Ch0_chargeMean   
  • er_ca_rac.05-elr.01-wac.02_Ch3_chargeMean  
  • er_ca_rac.05-elr.01-wac.02_Ch4_chargeMean  
• Charge 3 :
  • er_ca_rac.05-elr.01-wac.03_Ch0_chargeMean

9h30 redemarrage HM MO

- niveau 1 verifié (circuit eau, air comprimé, etat modulateur et SF6)

- ronde modulateur faite

- lancement IHM

      lancement IHM modulateur : pas de reaction

      accès à la casemate bloqué car sonde T3G est en défaut, redémarrage du système mesures radioprotection (LB 9000) ==> sonde T3G Ok

- ronde casemate faite

- démarrage modulateur en local

- utilisation de heath check pour redemarrer les servers

- demarrage modulateur HT = 1000 V et refroidissement a distance (sdc)

13h probleme de synchro : pas de synchro sur modulateur - a verifier

--> la notice synchro stipule de démarrer le laser photocathode en mode interne : mise sous tension du laser : ok

- la synchro externe modulateur fonctionne. HT = 1090 V , Frep = 10 Hz.

       visualisation de PiC et Prc dans le hall D1 et salle de controle sur oscillo : ok

--> pas trouvé comment visualiser les signaux RF avec interface Taurus

visualisation Pis et Prs

--> sauvegarde signaux RF sur clef usb

bilan : 3h de RF dans la canon et la section LIL, vide correct

test longue durée demain

17h15 arret

Prise de mesure relative entre les deux bobines : 18.7cm avec les alimentations éteintes mais du refroidissement.

Mise en route des alimentations 80A sur la contre champ, et 275 sur la focalisante.

Prise de mesure à nouveau : 18.7cm --> ca n'a pas bougé

On bouge le moteur Translation  li/ae/col.01-mot.01 qui doit faire une translation horizontale : +6 mm butée, -25mm.

On remet off les alimentations des solnénoides

L'encodeur pos ne se met pas à jour : on en déduit que le moteu ne marche pas correctement

On fait la translation verticale col01-mot.02