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 |
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) |
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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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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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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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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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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KD; mesures et shifts Linac
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Réunion 31/03
Prochaines mesures à faire :
Canon : |
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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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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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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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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; 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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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; 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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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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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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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, IC, VM, JH, KD, ND; Summary of the ring commissioning meeting
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The ring orbit has been re-established despite some difficulties after the shutdown.
The ring cavity has been started. Whatever the phase it kills the beam.
Two hypothesis: |
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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. |
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CB/HG/SC/KD; Programme linac semaine 5 décembre
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Lundi 5 décembre : redémarrage technique
Pb refroidissement Pb réglé le mercredi matin concomitance (anneau/linac), sensible à la pression qui est dans
le réseau primaire, à surveiller |
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VK, IC, VM, JH, ND; Summary of the ring commissioning meeting
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Discussed recent orbit correction of the expanded orbit.
Need to make run with cavity detuning from its resonant conditions
used in the conditioning.
Discussed measurement of tune, and possible origins of inconsistant/noisy measurements.
Either BPMs signal processing or weak excitation. Beam size?
Need to do measurements with scope, to see if we can interpret TbT |
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VK, IC, VI, JH, SC, ND; Summary of the ring commissioning meeting #5
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See slides attached to the indico page https://indico.ijclab.in2p3.fr/event/8885/
Pb with BPM => visual check of electrodes + hardware swap
Pb with steerer => Need to identify who will do the intervention and when |