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2017-10-19 2017-10-23 physics-shifter » History » Version 16

Mohayai, Tanaz Angelina, 24 October 2017 14:51

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Physics Shift Report
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Start Date: 10-10-2017
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End Date: 10-23-2017
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Start Run: 10016
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End Run: 10085
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Physics shifter: Tanaz A. Mohayai
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h2. Summary of Runs
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| *Run Number*      | *Run Type* | *Absorber* | *Momentum* | *Cooling Channel Magnets* |                                
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| 10016        | Reference Run  | Empty LH2 |  140MeV  |   Flip Mode - 2T                                              |
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| 10017 - 10018       | Reference Run - Beam Bump Tuning  | Empty LH2 |  140MeV  |   Flip Mode - 2T                                              |
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| 10019 - 10054      | Special Run | Empty LH2 |  140MeV  |   Flip Mode - 2T                                              |
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| 10055 - 10062      | Special Run - Tracker Timing Scan | Empty LH2 |  140MeV  |   Flip Mode - 2T                                              |
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| 10063 - 10077      | Special Run | Empty LH2 |  140MeV  |   Flip Mode - 2T                                              |
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| 10078 - 10085      | Special Run  | Empty LH2 |  170MeV  |   Flip Mode - 3T                                              |
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h2. Elog, CDB, and Reconstruction
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Elog entries are ok.
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CDB uploaded ok with the exception of the following runs: 
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10021: it has null End Date (as reported in the corresponding elog, Run Plan GUI hung up at end of run due to illegal character in end-run comment)
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10021: Start comment is wrong and should be 4 mm (not 3 mm)
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10022: Start comment is wrong and should be 4 mm (not 3 mm)
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10083: not in the CDB but properly explained in the corresponding MICE log (an attempt to start a Reference run was made but was never properly recorded in CDB)
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Online reconstruction is ok
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All runs are reconstructing ok with the exception of the following: 
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10083: was never recorded in CDB (please see above for explanation)
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h3. Timing Study
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There were tracker timing studies carried out during this physics shift period. The corresponding run numbers are in Summary of Runs table above.
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It was concluded that the baseline time (the current time) setting for the H40a task in the current run plan (3-140+M3-Test3 beamline tag in https://micewww.pp.rl.ac.uk/projects/operations/wiki/RunPlan20171015) is the optimum. This is because the "the maximum of the accepted trigger fraction is found at this baseline time". See the plot attached to elog entry: https://micewww.pp.rl.ac.uk/elog/Shift+summary/429 
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h2. Analysis
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Some runs seem to have missing spills (10022 - 10038). It may be because ISIS beam had periods of instabilities during these runs. Also, these runs had to be taken with target depth of around 34/35 mm.