For the case of RHRS, I chose a wrong discriminator to do the threshold scan for the gas-cer signal that went to the pvdis dedicated fastbus TDC during the previous scan. The discriminator in question was the PREX_r_disc (not the cherR_disc) in trigger_right.map file. Fig 3 is a zoomed in version of threshold scan of RHRS gas-cer discriminator while Fig 4 is its unzoomed version.
Looks like a threshold of 150 mV is appropriate for both left and right HRS so as to cut off pions effectively. The earlier we decide which threshold to chose, the better for the continued production.
A copy of this log entry has been emailed to: xiaochoa,rom,yqiang