Difference between revisions of "200kV Wien Filter"

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== Modeling 200kV Wien filter ==
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These pages contain materials for modifying the standard CEBAF Wien filter design (originally SLAC 100kV Wien filter) for operation at 200kV.
: J. Benesch, "Modeling the SLAC/JLab Wien filter" [[media:JLab-TN-15-032.pdf]]
 
: TOSCA model of air-side magnet assembly, that is (w/o Ni plates in vacuum chamber)
 
:: [[media:wien_noNi_B_10A.table.txt]]
 
:: [[media:wien_noNi_B_15A.table.txt]]
 
  
== Coil Modified for 20Amp operation ==
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===200 kV Wien HV Controls===
: Replace 2 layer X 14 turn/layer #16 round wire w/ 2 layer X 13 turn/layer #13 square wire
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::[[200kV High Voltage Power Supply & Controls]]
: Maintain 5.00" ID chamber clearance
 
  
== Magnet Steel Modifications ==
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===200 kV Wien Magnet===
: Coil fits within existing transverse gap (chamber to steel), but not within existing vertical gap (conflicts electrode ports)
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::Feb 11, 2020 - Final coil design [[media:200KeVWienFIlter-32893-D-0131.pdf]]
: Channels are cut into upper and lower steel yokes to allow coils to separate further (remove conflicts w/ electrode ports)
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::Mar 10, 2020 - Vendor has begun coil winding [[media:20200305_145427.jpg]]
: COIL RETAINER PLATES (32893-C-0008) flipped hold coil 0.124" further from mid plane (0.312 - 0.188 inches)
 
  
== Vacuum Chamber Modifications ==
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===200 kV Wien Assembly===
: Larger coil width conflicts with magnet mount lugs
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::[[Media:UITF Wien filter traveler May 11 2020.docx]]
: MAGNET MOUNT LUG (32893-C-0024) width reduced from 1.45 to 0.95 inches welded to vacuum chamber body reduced and moved
 
  
== Electrode modified for 20kV operation ==
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===CEBAF Wien Filter Upgrade Iterations===
* [https://logbooks.jlab.org/entry/3430990 Testing of existing feedthrough 20kV]
 
  
=== Wien Filter Assembly Electrical Feedthrough (JLAB DCG 32893-0020)
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::[[200kV Wien filter - V3]] - Third iteration modeled in CST by Gabriel with improved 40 kV feedthroughs has demonstrated (2019) 20kV per plate at UITF on a test stand but test still undergoing. Intended as a testbed for 20kV switch chassis test in preparation for implementation at CEBAF.
* [https://www.mdcvacuum.com/DisplayPart.aspx?d=MDC&wr=US&p=9272007 ISI=9272001 / MDC=0815002] (20kV/15A)
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* [http://www.lesker.com/newweb/feedthroughs/instrument_feedthroughs_shv20_singleend.cfm?pgid=cf Kurt Lesker= IFTXE011152]
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::[[200kV Wien filter - V2]] - Second iteration built using 20kV feedthroughs and HV tested in UITF beamline 2018 to ~12 kV limited by large vacuum excursions
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::[[200kV Wien filter - V1]] - First iteration to modify CEBAF Wien filter for 200kV operation, fabricated per Jay's proposal, and installed at UITF 2017
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===[[Wien Filter References]]===

Revision as of 13:02, 11 May 2020

These pages contain materials for modifying the standard CEBAF Wien filter design (originally SLAC 100kV Wien filter) for operation at 200kV.

200 kV Wien HV Controls

200kV High Voltage Power Supply & Controls

200 kV Wien Magnet

Feb 11, 2020 - Final coil design media:200KeVWienFIlter-32893-D-0131.pdf
Mar 10, 2020 - Vendor has begun coil winding media:20200305_145427.jpg

200 kV Wien Assembly

Media:UITF Wien filter traveler May 11 2020.docx

CEBAF Wien Filter Upgrade Iterations

200kV Wien filter - V3 - Third iteration modeled in CST by Gabriel with improved 40 kV feedthroughs has demonstrated (2019) 20kV per plate at UITF on a test stand but test still undergoing. Intended as a testbed for 20kV switch chassis test in preparation for implementation at CEBAF.
200kV Wien filter - V2 - Second iteration built using 20kV feedthroughs and HV tested in UITF beamline 2018 to ~12 kV limited by large vacuum excursions
200kV Wien filter - V1 - First iteration to modify CEBAF Wien filter for 200kV operation, fabricated per Jay's proposal, and installed at UITF 2017

Wien Filter References