PREX/CREX May 4 2017 1:00pm EDT

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Logistic information

 BlueJeans calling instructions:
 Toll-Free Number (U.S.&  Canada):  888-240-2560
 International toll number:         408-740-7256
 PARTICIPANT CODE:                  913380354#
 Room IRL:                            CEBAF F227


  1. Seamus: Septum 1cm shift results ELOG 3391
    • SR: the intuition from last time turned out to be true, a 1 cm shift does not affect the experiment much
    • SR: we would have to use a 10^-3 level weaker field and slight change in measured Q^2 KP: the field being smaller is counterintuitive. SR: it may pick up more field integral with this configuration
    • BM: can we use an analysis like this for the alignment question? SR: yes, we could check and we probably don't have too tight constraint.BM: this would minimize the installation time. SR: we should be careful regaring the pitch of the magnet (not being level).
    • CG: what will a 1mm raster on horizontal (CREX) do? SR: would not expect large changes.
  2. Seamus: schedule for tomorrow.
    • SR: meeting 1-4 tomorrow. Should have my slides ready.
  3. Caryn: ion chambers
    • CP: looked at different locations for Ar and N2 detectors.
    • CP: the best ratio between copper and leand seem to be behind the collimator (good signal, factor 2 difference) and 53 deg US (small signal, factor of 3/5 difference).


Kent P, Seamus R, Bob M, Victoria O, DUstin M, Tao Y, Tyler K, Silviu D, Guido U, Paul S, Caryn P