Difference between revisions of "GTS meeting 5 02 17"
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# Ran for few seconds before a HV arc. QE dropped by a factor of 2. | # Ran for few seconds before a HV arc. QE dropped by a factor of 2. | ||
# Ran again for 1.5 hours (with ion-precipitators on) before a HV arc. QE dropped by another factor of 2. | # Ran again for 1.5 hours (with ion-precipitators on) before a HV arc. QE dropped by another factor of 2. | ||
| + | # [https://logbooks.jlab.org/entry/3471482 ion collectors and anode current] | ||
| + | # The ion collector was wired incorrectly resulting in net zero E-field, assuming beam was centered perfectly: | ||
| + | |||
Revision as of 13:46, 1 May 2017
- Beta Calculations: media:Sajini_April2017_Beta_calculations.pdf
- Attempts to run at 1 mA:
- Ran for few seconds before a HV arc. QE dropped by a factor of 2.
- Ran again for 1.5 hours (with ion-precipitators on) before a HV arc. QE dropped by another factor of 2.
- ion collectors and anode current
- The ion collector was wired incorrectly resulting in net zero E-field, assuming beam was centered perfectly:
- Down Monday - Wednesday to:
- Degas dump with NEGS at 25% on for ion pumps to take vacuum load
- Replace ND filter from ND1 to ND3
- Re-activate photocathode with 3 mm active area
- Instrument wire scanner
- Install WiFi access station and enable JMenu on PC in GTS cave
- Why is Dump/FC reading -20 nA?
- Hi-pot VIPGT06
- SCAM VL frequency is not 60 Hz?