Difference between revisions of "200kV Wien Filter"

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== ME Design  ==
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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.
  
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====Wien filter drawings are up to date (as of June 2017)====
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===200 kV Wien HV Controls===
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: ''M:\me-group\machie\wien filter''
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::[[200kV High Voltage Power Supply & Controls]]
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:: * main folder has the original fabrication drawings we used.
 
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:: * sub folder that has revised version of the original drawings to show the latest as-built changes.
 
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:: * sub folder labeled "200KV" that has drawings for the differences in the 200KV wien filter.
 
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:: * copy of ECO 1046 that has the analysis of the original vacuum chamber welds.
 
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:: * a spreadsheet that lists all the drawings and revision status and applicability.
 
  
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::: Note : we discussed making electrodes from one solid piece of stainless steel instead of five pieces brazed together.
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===200 kV Wien Magnet===
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::Feb 11, 2020 - Final coil design [[media:200KeVWienFIlter-32893-D-0131.pdf]]
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::Mar 10, 2020 - Vendor has begun coil winding [[media:20200305_145427.jpg]]
  
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== Magnet Design ==
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===200 kV Wien Assembly===
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::[[Media:UITF Wien filter traveler May 11 2020.docx]]
  
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==== Jay's TOSCA Modeling  ====
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===CEBAF Wien Filter Upgrade Iterations===
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: J. Benesch, "Modeling the SLAC/JLab Wien filter" [[media:JLab-TN-15-032.pdf]]
 
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: TOSCA model of air-side magnet assembly, that is (w/o Ni plates in vacuum chamber)
 
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:: [[media:wien_noNi_B_10A.table.txt]]
 
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:: [[media:wien_noNi_B_15A.table.txt]]
 
  
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==== Coil Modified for 20Amp operation ====
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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.  
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: Replace 2 layer X 14 turn/layer #16 round wire w/ 2 layer X 13 turn/layer #13 square wire
 
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: Maintain 5.00" ID chamber clearance
 
  
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==== Magnet Steel Modifications ====
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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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: Coil fits within existing transverse gap (chamber to steel), but not within existing vertical gap (conflicts electrode ports)
 
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: Channels are cut into upper and lower steel yokes to allow coils to separate further (remove conflicts w/ electrode ports)
 
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: COIL RETAINER PLATES (32893-C-0008) flipped hold coil 0.124" further from mid plane (0.312 - 0.188 inches)
 
  
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==== Vacuum Chamber Modifications ====
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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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: Larger coil width conflicts with magnet mount lugs
 
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: MAGNET MOUNT LUG (32893-C-0024) width reduced from 1.45 to 0.95 inches welded to vacuum chamber body reduced and moved
 
  
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== High Voltage Design ==
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===[[Wien Filter References]]===
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==== HV feedthroughs (20kV/15A) JLAB DCG 32893-0020====
 
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: ISI/MDC version of P/N
 
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:: [https://www.mdcvacuum.com/DisplayPart.aspx?d=MDC&wr=US&p=9272007 ISI=9272001 / MDC=0815002] (20kV/15A)
 
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:: [https://www.mdcvacuum.com/DisplayPart.aspx?p=9912452 MDC install kit (old ISI # 0263202 not found)]
 
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: Kurt Lesker version of P/N
 
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:: [http://www.lesker.com/newweb/feedthroughs/instrument_feedthroughs_shv20_singleend.cfm?pgid=cf Kurt Lesker= IFTXE011152]
 
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:: [http://www.lesker.com/newweb/feedthroughs/cablinginstruction_shv20.cfm?pgid=0 20kV feedthrough/cabling (RG-8U)]
 
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==== Vacuum modifications ====
 
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: Phil/Danny increased the length of the Electrode Insulator (see JLAB DCG 32893-0112)
 
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:: Increased length by 0.25" see for comparison [[media:171212_longerspacer.pdf]]
 
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: Phil/Danny increased the length of the HV Connector Spring Guide (see JLAB DCG 32893-0137)
 
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:: Increased length by 0.25" see for comparison [[media:171212_longerguide.pdf]]
 
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==== Tests ====
 
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: [https://logbooks.jlab.org/entry/3430990 Brief bench test of 20kV]
 
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==== Power Supplies ====
 

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

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