Difference between revisions of "GTS meeting 5 02 17"
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== Attempted to run at 1 mA == | == Attempted to run at 1 mA == | ||
# 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 | + | # Ran again for 1.5 hours with ion-precipitators on (?) before a HV arc. QE dropped by another factor of 2. |
Revision as of 08:21, 2 May 2017
Attempted 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.
Down Monday – Wednesday. List of Tasks
- Degas dump with NEGS at 2 Amps 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 point and enable JMenu on PC in GTS cave
- Why is Dump/FC picoammeter reading is noisy?
- Hi-pot VIPGT06
- SCAM VL LINE SYNC frequency is not 60 Hz?
- Put ND filter in front of ITVGT06 and mount camera on the floor.
Beta Calculations: media:Sajini_April2017_Beta_calculations.pdf
Ion Precipitators
- ion collectors and anode current
- The downstream ion collector was wired incorrectly
- This is a sketch of the internals of the downstream ion collector VICGT06
- These are Cornell's results
- Grames paper on anode bias: Media:Grames_PST07_final.pdf
- Pozdeyev PAC 2007 ion trapping: Media:Pozdeyev.PDF
- Cornell PRAB paper on ion clearing electrodes: Media:Cornell ion colelctors PhysRevAccelBeams.19.034201.pdf
- Gabriel's calculation (POISSON model) of the voltage needed in upstream ion collector (VICGT04, wire sticking out of the spool piece): Media:Ion collector VICGT04 wire stikcing out of spool piece.pdf
- CEBAF vacuum during 1 mA run
- GTS vacuum 1 mA run April 28 2017
- GTS 1 mA run also tripped 1.5 hour July 11 2016
