ND; RE: Summary of the ring commissioning meeting
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Regarding the remote control of the RF synthetizer: it can only be controlled via GPIB and RS-232.
=> Phase shift will be done from the synchro synthetiser
=> Power control can be done with a variable attenuator controlled by the synchro synthetiser or a delay generator. |
IC, VK, VM, SC, ND; Summary of the ring commissioning meeting 
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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: |
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VK, VM, SC, ND, HG; Summary of the ring commissioning meeting
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Summary of last week:
- On Thursday the beam energy was very different from usual (magnets current higher 172A for TL; 176A for RI) => made it impossible to re-use
previous settings for the ring and to find new settings. |
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VK,IC, SC, VM, ND; Summary of the ring commissioning meeting
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No beam last week. No beam this week.
Machine recovery on 2/2 => Nicolas may try to tune the machine with students.
Data taking on 9/2 for diags and machine characterization. |
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ND; Notes from ThomX Physics meeting
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Present: IC, VK, VM, VC, SC, MEK, KD, MJ, HG, ND, MO (sous réserve d'oublis)
Visio: CB
L'ordre du jour et les transparents présentés en réunion sont sur: https://indico.ijclab.in2p3.fr/event/9205/ |
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ND; Verification variables pour l'anneau
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L'IHM de verification des variables pour l'anneau a ete mis a jour.
Il est accessible dans plateforme IHM section "Outils", éeme collone, "eme ligne: "Check vars for RING".
Utilisation de l 'IHM (voir copie d'ecran ci-joint): |
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VM, VK, ND; Summary of the ring commissioning meeting
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This week: beam on Thursday.
So far we did not see any screenshot of Ring variables check.
Looking at last week's data, shot to shot charge instability seems to be > 15% |
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ND; RE: Notes from ThomX Physics meeting
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Présent: VK, SC, KD, MJ, HG, ND
Présentation par Marie. Cf indico https://indico.ijclab.in2p3.fr/event/9242/
Demo par Slava. |
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IC, VM, SC, JH, VC, ND; Summary of the ring commissioning meeting
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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. |
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IC, VK, VM, JH, ND; Summary of the ring commissioning meeting
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- 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 |
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ND; Réunion Physique ThomX
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Transparents sur: https://indico.ijclab.in2p3.fr/event/9358/
Quelques notes de la réunion de Physique de ThomX:
- Présentation de Marie sur les mesures dans le linac |
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KD; mesures et shifts Linac
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Réunion 31/03
Prochaines mesures à faire :
Canon : |
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IC, VK, LS, JH, ND; Summary of the ring commissioning meeting
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=== 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: |
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VK, IC, JH, VM, LS, MB, ND; Summary of the ring commissioning meeting
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Main studies:
- Measure bucket width in phase on Thursday at 500.02MHz => no storage beyond 45kV
- Measure frequency with spectrum analyser => 500.39MHz |
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KD; Mise en place Ligne X
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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) |
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IC, VK, VM, LS, JH, MB, ND; Summary of the ring commissioning meeting
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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. |
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IC, VK, VM, LS, JH, SC, ND; Summary of the ring commissioning meeting
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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 |
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KD; RE: Mise en place Ligne X
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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. |
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VK, IC, LS, ND; Summary of the ring commissioning meeting
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Discussion mécanique
- Tous les dipoles ont été alignés par rapport à des surfaces de référence
- Le décalage du centre magnétique par rapport au centre mécanique a été mesuré par Cynthia et pris |