GTS meeting 3 14 17

• DO NOT TURN MAGNET ON WHILE GUN AT HV: with Gun HV off, first bring up the magnet then turn on Gun HV.

• What we have learned so far:

1. With Gun solenoid off, beamlet from the slit on the second viewer is not exactly horizontal - camera may not be aligned?
2. The gun solenoid is not centered on the beam. It is significantly off in -45 degree direction (as seen on the viewers). That has to be addressed before we can take good data.
3. The gun HV being on or biased would not help the QE scans. It appears that the best way to measure the QE is with the anode biased and the puck grounded with the long manipulator.