View source for Taking MAIN detector Counting Run

* Set the HV for DN-Quartz (MAIN) detectors in both arms to -1900V (as explained in [https://prex.jlab.org/wiki/index.php/HVgui HVgui])
** '''L1.1 channel in S1 (Slot1) in each arm HV GUI''' (See Image 1)
** '''Important Note: Once you are done with with counting Run Turn this channel OFF and set the value to 0.0'''
[[File:RHRS_Quartz_HV.png|thumb|600px|right|Image 1]]
* Enable the HV channels
* Turn ON scintillators
* Turn ON VDCs ('''NOTE''':Make sure the scintillator rate is below 500k before turning VDC ON) 
* Take counting runs on both arms (LHRS and RHRS) atleast 200k events
* To analyze the runs:
** ssh -Y a-onl@aonl1 
** goprex
** analyzer -l
** .x setup2.C(runNumber,200000)
* To produce plots:
** In a-onl@aonl1 machine:
** cd devi/crex/alignment
** analyzer prex_counting/prexLHRS_runNumber_200000.root for LHRS
** analyzer prex_counting/prexRHRS_runNumber_200000.root for RHRS
** .x alignDS.C
** '''Note:''' please don't modify the macro, if you want you can copy it to your directory and modify there
** Look into the elastic peak and read the edge of quartz (the intersection of red and blue histograms in "Projected x on detector plane" plot)
** Zoom in to see the precise edge
* When you are done with taking counting data '''turn OFF''' the '''DN-Quartz (MAIN) detectors HVs'''
*'''NOTE:''' never turn ON '''DN-Quartz''' HVs during high current production running keeping them at higher HV (they will die)
* For safety, set their HV t0 0V at the end