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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
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