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Message ID: 326
Entry time: Thu, 7.07.2022 16:46:37
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| Author: |
Y. Nagai |
| Subject: |
Beam position fine tunings (T2K replica target run 2022) |
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We observe beam vertical position change frequently. Below summarize the adjustment history.
It seems to have some correlation with accelerator performance, but not clear.
===================================================================================================
Y (reference) = 2.6 cm
Y (before) = observed shifted beam position (vertical)
Y (after) = beam position after re-tuning (vertical)
===================================================================================================
time | Y (before) | Y (after) | TRIM05 change | Comment
===================================================================================================
06.07 22:55 | 2.2 cm | 2.6 cm | +2.0A --> -2.0A | Beam intensity was unstable. YN did.
07.07 02:23 | 2.0 cm | 2.6 cm | -2.0A --> -4.5A | After intensity raised by CCC. YN did.
07.07 16:48 | 2.82 cm | 2.6 cm | -4.5A --> -3.0A | After short accelerator break. YN did.
07.07 18:44 | 2.97 cm | 2.57 cm | -3.0A-> -2.0A-> -1.0A-> 0.0A | Several short accelerator breaks. TN did. -3.0A (2.9cm) -> -2.0A (2.93cm) -> -1.0A (2.70cm) -> 0.0A (2.57cm)
07.07 21:37 | 2.32 cm | 2.6 cm | 0.0A -> -2.0A | Beam intensity is higher (S1 = 48K). It goes up from 40K to 48K around 19:00. Then at 20:00, Y position shift is observed.
14.07 14:30 | 3.0 cm | 2.7 cm | -2.0A -> +1.0A | Beam intensity is about S1 = 43K
19.07 12:00 | 3.1 cm | 2.8 cm | -2.0A -> 0.0A | Beam intensity is S1=61K after accelerator trouble last night. Maybe the TRIM05 starting value was reset to -2.0A after hard reset during access?
19.07 13:00 | 2.8 cm | 2.6 cm | 0.0A -> +1.0A | Fine adjust to hit 2.6 cm position
20.07 19:45 | 2.9 cm | 2.5 cm | +1.0A -> +2.0A | After MD, we observed Y shift.
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