Difference between revisions of "GTS meeting 5 02 17"
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== Ion Precipitators == | == Ion Precipitators == | ||
# [https://logbooks.jlab.org/entry/3471482 ion collectors and anode current] | # [https://logbooks.jlab.org/entry/3471482 ion collectors and anode current] | ||
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# [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] | ||
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# 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 | ||
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# [[File:Sketch of ion colelcotr internals VICGT06.jpg]] | # [[File:Sketch of ion colelcotr internals VICGT06.jpg]] | ||
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# These are Cornell's results | # These are Cornell's results | ||
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# [[File:Cornell ion clearing results with electrode voltage equation.jpg]] | # [[File:Cornell ion clearing results with electrode voltage equation.jpg]] | ||
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# Grames paper on anode bias: [[Media:Grames_PST07_final.pdf]] | # Grames paper on anode bias: [[Media:Grames_PST07_final.pdf]] | ||
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# Pozdeyev PAC 2007 ion trapping: [[Media:Pozdeyev.PDF]] | # Pozdeyev PAC 2007 ion trapping: [[Media:Pozdeyev.PDF]] | ||
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# Cornell PRAB paper on ion clearing electrodes: [[Media:Cornell ion colelctors PhysRevAccelBeams.19.034201.pdf]] | # Cornell PRAB paper on ion clearing electrodes: [[Media:Cornell ion colelctors PhysRevAccelBeams.19.034201.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]] | ||
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# CEBAF vacuum during 1 mA run | # CEBAF vacuum during 1 mA run | ||
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# [[File:CEBAFvacuum1mA.png]] | # [[File:CEBAFvacuum1mA.png]] | ||
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# GTS vacuum 1 mA run April 28 2017 | # GTS vacuum 1 mA run April 28 2017 | ||
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# [[File:pmceimghkhgmffji.png]] | # [[File:pmceimghkhgmffji.png]] | ||
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# GTS 1 mA run also tripped 1.5 hour July 11 2016 | # GTS 1 mA run also tripped 1.5 hour July 11 2016 | ||
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# [[File:Slide09.jpg]] | # [[File:Slide09.jpg]] | ||
Revision as of 08:16, 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
