Flipper

From PREX Wiki
Revision as of 10:36, 3 August 2019 by Caryn Palatchi (Talk | contribs)

Jump to: navigation, search
  • Flip Insertable Half Wave Plate (IHWP) state
    • to flip IHWP state, will have to inform other halls of intention to flip state first. Then call MCC and ask them to flip the insertable half wave plate state. They will turn the beam off and in the parity controls screen you will see the IHWP state go from in->out or from out->in.
    • Note: After the IHWP state has been changed, the parity alarms will go off until the voltages are set correctly.
    • Then (after IHWP is in new desired state), in a terminal go to ssh apar@adaq2, then cd ~/feedback2019, then run ./FlipPCValues within the directory to set the voltages correctly
      • It will ask if you want to increase the slug number, say y for yes. It will ask if you've stopped the run, make sure you have, then say y for yes. It will ask if you've observed the IHWP state change, go to parity control screen and check the IHWP state has changed, if so, then type y for yes.
    • Double check voltages are correct: on apar@adaq2, in /feedback2019, run ./checkPCvalues The output should tell you the voltages are good, otherwise call an expert.
    • Update the slug number and IHWP state on the white board, write down the time of flip and first run number for new slug.
    • Check the values against the table in Parity Checks
    • if alarms go off and values don't match those in table, call an Expert


Special note for slugs 24,25

  • For slug 24 and 25 on 8/1/2019, use ./CancelPCValues and ./checkCancelPCValues
    • to flip IHWP state, will have to inform other halls of intention to flip state first. Then call MCC and ask them to flip state.
    • Note: After the IHWP state has been changed, the parity alarms will go off until the voltages are set correctly.
    • Then (after IHWP is in new desired state), on apar@adaq2, in ~/feedback2019/CancelFlip, run ./CancelPCValues to set the voltages correctly
    • Double check voltages are correct: on apar@adaq2, in /feedback2019/CancelFlip, run ./checkCancelPCvalues The output should tell you the voltages are good, otherwise call an expert.
    • Update the slug number and IHWP state of the white board, write down the time of flip and first run number for new slug.
    • Double check AposV which has been modified: Parity Alarm for AposV will still be going off. It is OK to silence it ONLY for these slugs as long as for IHWPin, AposV=15 and for IWHPout, AposV=-237.