[Hallc_running] [New Logentry] RC general updates for Hall C, Wed swing to Thurs swing

mack at jlab.org mack at jlab.org
Thu Mar 5 18:50:02 EST 2020

Logentry Text:
     SHMS dipole PS work into early Wed swing. Work resumed this morning, and the techs left the hall at 14:10 . https://logbooks.jlab.org/entry/3798004 No guarantees, but we'll resume the program. 

    Slow restoration Wed mid-swing: steering changes in injector reduced interception in injector (mostly a PQB issue), and a C laser tweak that had increased BLM trips was backed out. 

    Took HMS data over Wed owl (HMS -3.5 GeV/c) with 3He target, longitudinal polarization, de-rating ABU's and BANU's by half due to single arm operation. 

    Two polarization measurements Wed owl, both 54%-ish. 

    Opportunistic access was made Thurs day for PNMR work. (Sounds better than opportunistic acess to reduce the target polarization lol.) 

    Bill Henry sees what looks like beam scraping on the wall of the 3He glass cell. https://logbooks.jlab.org/entry/3797924 The dilution is not insignificant, but not so easy to assess from the online plots. Simona indicates it's been that way a while which is nice to know (ie, it implies the target didn't get bumped recently). More history, systematics, and possible tests at https://logbooks.jlab.org/entry/3797970 . 

Fast raster test in progress Thurs swing, reduced from 4.5mm diameter to 4.0mm diameter. 

For the Current Run Plan, see https://hallcweb.jlab.org/wiki/index.php/RC_Meeting_and_Run_Plan,_Thursday,_March_5_2020 . 


This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/3798110
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