200kV Wien Filter
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ME Summary of the Wien Filters
Wien filter drawings are up to date (as of June 2017)
- M:\me-group\machie\wien filter
- In the main folder are:
- the original fabrication drawings we used.
- sub folder that has revised version of the original drawings to show the latest as-built changes.
- sub folder labeled "200KV" that has drawings for the differences in the 200KV wien filter.
- copy of ECO 1046 that has the analysis of the original vacuum chamber welds.
- a spreadsheet that lists all the drawings and revision status and applicability.
Note : we discussed making electrodes from one solid piece of stainless steel instead of five pieces brazed together.
Modeling 200kV Wien filter
- 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)
Coil Modified for 20Amp operation
- Replace 2 layer X 14 turn/layer #16 round wire w/ 2 layer X 13 turn/layer #13 square wire
- Maintain 5.00" ID chamber clearance
Magnet Steel Modifications
- Coil fits within existing transverse gap (chamber to steel), but not within existing vertical gap (conflicts electrode ports)
- Channels are cut into upper and lower steel yokes to allow coils to separate further (remove conflicts w/ electrode ports)
- COIL RETAINER PLATES (32893-C-0008) flipped hold coil 0.124" further from mid plane (0.312 - 0.188 inches)
Vacuum Chamber Modifications
- Larger coil width conflicts with magnet mount lugs
- MAGNET MOUNT LUG (32893-C-0024) width reduced from 1.45 to 0.95 inches welded to vacuum chamber body reduced and moved
Modifications to our standard Wien Filter for 200 keV Beam Operation
We still use the standard HV feedthroughs (20kV/15A) JLAB DCG 32893-0020
- ISI/MDC version of P/N
- Kurt Lesker version of P/N
- Phil/Danny increased the length of the Electrode Insulator (see JLAB DCG 32893-0112)
- Increased length by 0.25" see for comparison media:171212_longerspacer.pdf
- Phil/Danny increased the length of the HV Connector Spring Guide (see JLAB DCG 32893-0137)
- Increased length by 0.25" see for comparison media:171212_longerguide.pdf