Taking MAIN detector Counting Run

From PREX Wiki
Revision as of 00:25, 14 December 2019 by Adhidevi (Talk | contribs)

Jump to: navigation, search
  • Set the HV for DN-Quartz (MAIN) detectors in both arms to -1900V (as explained in HVgui)
    • L1.1 channel in S1 (Slot1) in each arm HV GUI (See Image 1)
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