Difference between revisions of "GTS meeting 5 02 17"
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| + | == Down Monday - Wednesday. Plan 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 point and enable JMenu on PC in GTS cave | ||
| + | # Why is Dump/FC reading -20 nA? | ||
| + | # 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. | ||
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| + | == Beta Calculations: [[media:Sajini_April2017_Beta_calculations.pdf]] == | ||
| − | + | ||
| + | == Attempts to run at 1 m == | ||
# 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. | ||
| + | |||
| + | |||
| + | == Ion Precipitators == | ||
# [https://logbooks.jlab.org/entry/3471482 ion collectors and anode current] | # [https://logbooks.jlab.org/entry/3471482 ion collectors and anode current] | ||
# [https://logbooks.jlab.org/entry/3471521 The downstream ion collector was wired incorrectly] | # [https://logbooks.jlab.org/entry/3471521 The downstream ion collector was wired incorrectly] | ||
# This is a sketch of the internals of the downstream ion collector VICGT06 | # This is a sketch of the internals of the downstream ion collector VICGT06 | ||
| − | #[[File:Sketch of ion colelcotr internals VICGT06.jpg]] | + | # [[File:Sketch of ion colelcotr internals VICGT06.jpg]] |
# These are Cornell's results | # These are Cornell's results | ||
| − | #[[File:Cornell ion clearing results with electrode voltage equation.jpg]] | + | # [[File:Cornell ion clearing results with electrode voltage equation.jpg]] |
# Grames paper on anode bias: [[Media:Grames_PST07_final.pdf]] | # Grames paper on anode bias: [[Media:Grames_PST07_final.pdf]] | ||
# Pozdeyev PAC 2007 ion trapping: [[Media:Pozdeyev.PDF]] | # Pozdeyev PAC 2007 ion trapping: [[Media:Pozdeyev.PDF]] | ||
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# 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]] | # 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 | # CEBAF vacuum during 1 mA run | ||
| − | #[[File:CEBAFvacuum1mA.png]] | + | # [[File:CEBAFvacuum1mA.png]] |
# GTS vacuum 1 mA run April 28 2017 | # GTS vacuum 1 mA run April 28 2017 | ||
| − | #[[File:pmceimghkhgmffji.png]] | + | # [[File:pmceimghkhgmffji.png]] |
# GTS 1 mA run also tripped 1.5 hour July 11 2016 | # GTS 1 mA run also tripped 1.5 hour July 11 2016 | ||
| − | #[[File:Slide09.jpg]] | + | # [[File:Slide09.jpg]] |
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Revision as of 08:14, 2 May 2017
Down Monday - Wednesday. Plan 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 point and enable JMenu on PC in GTS cave
- Why is Dump/FC reading -20 nA?
- 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
Attempts to run at 1 m
- 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 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
