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User name mhuang
Log entry time 16:14:50 on March 05, 2012
Entry number 363822
keyword=Central hole optics data dp vs VertexZThis is from LHRS #2725, Carbon target in LHe, and dp=0% standard setting.
On Jian-ping suggestions, I made a cut on tg_th vs tg_ph to choose the central hole, then plot dp vs VertexZ. From the plot, the elastic peak of carbon is clearly separated. The other peak could be from both first excited state of C and elastic of He (they are less than 1MeV apart). As Zhihong suggested, I checked the center of these two patches, which is about 5mm along vz, probably because the second one is a combination from He and C.
Thus, we are able to cut out the carbon even LHe is there.
A copy of this log entry has been emailed to: jpchen, yez, vasulk, chao, mhuang
Figure 1
