Difference between revisions of "Run Coordination Meetings:Fall2017 Spring2018 Run/March recovery"
(→Runplan for restarting the Spring 2018 run after the March down time due to the transformer failure) |
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If the result of one of the tasks above does not look good, ask MCC to improve the beam tune. | If the result of one of the tasks above does not look good, ask MCC to improve the beam tune. | ||
| − | + | Tell/email Hovanes that he can check the beam convergence (we do not need this result to proceed). | |
Insert 1×10<sup>-4</sup> Al. radiator and request 100 nA | Insert 1×10<sup>-4</sup> Al. radiator and request 100 nA | ||
| − | Put the 5mm collimator in. Check that the beam position on the Act. Col. corresponds to the expected numbers (see left white board) when beam is centered on the profiler. | + | Put the 5mm collimator in. |
| + | Check that the beam position on the Act. Col. corresponds to the expected numbers (see left white board) when beam is centered on the profiler. | ||
Retract profiler | Retract profiler | ||
| Line 32: | Line 33: | ||
*Retract the 1×10<sup>-4</sup> Al. radiator | *Retract the 1×10<sup>-4</sup> Al. radiator | ||
*Insert the production diamond (JD70-100) | *Insert the production diamond (JD70-100) | ||
| + | *Insert the TPol 75 μm Be converter | ||
*Request 150 nA | *Request 150 nA | ||
| + | High granularity PS scaler coincidence rate should be 2.7±0.3 kHz. (see [https://logbooks.jlab.org/entry/3541345 HDLOG entry #3541345] for expected rates at 150 nA) | ||
Revision as of 16:06, 23 March 2018
Runplan for restarting the Spring 2018 run after the March down time due to the transformer failure
Before the beam is established, check that:
- Tagger quad is on at -4.2A
- PS magnet is on at 910A
- Sweeping magnet is on at 190A
- Collimator is in blocking position
- All radiators are retracted
Once the beam position is good on 5C11B (see numbers on the left white board)
- Fill the LH2 target
- Insert the 2×10-5 Al. radiator (remember to call MCC and ask to mask the FSD each time we insert/remove something from the electron beam line)
- Insert the profiler
- Request 50 nA. Check that the beam position is at x=0,y=0 on the profiler
Check the radiation monitor levels (see table on the bottom right of the white board) at 50 nA with and without the 2×10-5 Al. radiator
Do Harp scans (ours and MCC).
If the result of one of the tasks above does not look good, ask MCC to improve the beam tune.
Tell/email Hovanes that he can check the beam convergence (we do not need this result to proceed).
Insert 1×10-4 Al. radiator and request 100 nA Put the 5mm collimator in. Check that the beam position on the Act. Col. corresponds to the expected numbers (see left white board) when beam is centered on the profiler.
Retract profiler
PS rates check:
- Retract the 1×10-4 Al. radiator
- Insert the production diamond (JD70-100)
- Insert the TPol 75 μm Be converter
- Request 150 nA
High granularity PS scaler coincidence rate should be 2.7±0.3 kHz. (see HDLOG entry #3541345 for expected rates at 150 nA)
