How to Take a Moller Run

Hall C Moller Step-By-Step Guide: How to take a Moller Run

Abstract
A step-by-step guide for shift personnel to follow in order to take a Møller run. It is assumed that the polarimeter has already been set up and tuned for the present beam energy by an expert.

HOW TO TAKE A Møller RUN
This document describes the steps to be taken by a Hall-C experimenter performing a Møller beam polarization measurement during NPS running. There is a complimentary procedure which the MCC operators will follow, [1]

• Record Injector Parameters: during some period of "normal" NPS running, record the conditions of the polarized source and the state of the beam to the other halls. This will allow us to verify that we are taking Møller data in a state as close as possible to NPS production data-taking conditions.

1. Login: ssh cdaq@cdaql2. Standard cdaq password.
2. cd moller/anal/nps
3. ./GetEpics.pl
4. Capture this screen or transcribe its contents to the hclog

• Møller GUIs: Start the Møller GUIs

1. Login: ssh cvxwrks@cdaql6. Standard cvxwrks password.
2. cd MEDM/moller
3. ./start moller screens.sh
4. You should now see the main Møller control screen, the Møller BPMS, and Møller HV.
5. The screens may be started individually if needed.
   1. Møller GUI
      1. cd MEDM/moller
      2. ./moller.adl
   2. BPMs
      1. cd MEDM/moller
      2. ./BPMs for moller 2019.adl
   3. HVs
      1. cd ~/EpicsHL/HV/shms moller
      2. ./hv.tcl

• Møller BPMs II Open up this nifty PAW script

1. 1. ssh -Y cdaq@cdaql6
   2. cd ~/Users/gaskelld/BPM/kumac
   3. paw
   4. exe moller live bpms

• Verify the Cryo status: Check that the Møller cryostat is above 90% on the main Møller GUI screen. It is in the upper left corner.

• Call MCC: tell them that you are getting ready for a Møller run. They will take a "zero pos" of the Hall C line and call you back when

they are ready for you to retract the target.