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    User name Jin Huang

    Log entry time 17:29:20 on July 05, 2010

    Entry number 330259

    This entry is a followup to: 330225


    keyword=RHRS Optics Run Checks: Optics Target VZ

    VZ of RHRS without sieve was checked. The result on optics target is confusing. For each plot below * Left top: 2D hit map on VDC * Right Top: track angle at target (tg_th:th_ph) * Left Bottom: momentun deviation (tg_dp) * Right Bottom: VZ vs tg_ph correlation. Each foil should be a strip Fig 1&2 are foil target Ta and Pb. Each of them show a clear VZ vs tg_ph correlation. We can also identify PREX collimator from angular plots. Fig 3&4 are taken at optics target. There is no clear strip on vz:tg_ph. Also event also cluster at downward of tg_th angle (+th is down). PS: there is also indication of missing wires at these run 1744-1747. recovered at 1750?? vz:tg_ph on optics target is strange. One naive guess is we are not hitting carbon foils but it's holder. Therefore, upbending particle is gone. We can move beam downward and take another run as test.

    A copy of this log entry has been emailed to: riordan, vasulk, toron

    Fig.1 :Ta target, run 1735

    Fig.2 :Ph Target, run 1750

    Fig.3 :Opitcs target, run 1744

    Fig.4 :Opitcs target, run 1747