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 08:15, 2 May 2017

Down Monday - Wednesday. Plan to:

  1. Degas dump with NEGS at 25% on for ion pumps to take vacuum load
  2. Replace ND filter from ND1 to ND3
  3. Re-activate photocathode with 3 mm active area
  4. Instrument wire scanner
  5. Install WiFi access point and enable JMenu on PC in GTS cave
  6. Why is Dump/FC reading -20 nA?
  7. Hi-pot VIPGT06
  8. SCAM VL LINE SYNC frequency is not 60 Hz?
  9. 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

  1. Ran for few seconds before a HV arc. QE dropped by a factor of 2.
  2. Ran again for 1.5 hours (with ion-precipitators on) before a HV arc. QE dropped by another factor of 2.


Ion Precipitators

  1. ion collectors and anode current


  1. The downstream ion collector was wired incorrectly


  1. This is a sketch of the internals of the downstream ion collector VICGT06


  1. Sketch of ion colelcotr internals VICGT06.jpg


  1. These are Cornell's results


  1. Cornell ion clearing results with electrode voltage equation.jpg


  1. Grames paper on anode bias: Media:Grames_PST07_final.pdf


  1. Pozdeyev PAC 2007 ion trapping: Media:Pozdeyev.PDF


  1. Cornell PRAB paper on ion clearing electrodes: Media:Cornell ion colelctors PhysRevAccelBeams.19.034201.pdf


  1. 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


  1. CEBAF vacuum during 1 mA run


  1. CEBAFvacuum1mA.png


  1. GTS vacuum 1 mA run April 28 2017


  1. Pmceimghkhgmffji.png


  1. GTS 1 mA run also tripped 1.5 hour July 11 2016


  1. Slide09.jpg
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