Difference between revisions of "CEBAF upgrade meeting - December 13, 2017"

Revision as of 11:27, 13 December 2017

Install the new 200kV gun during 2018 SAD, sometime after the Bubble Chamber experiment. Imagine ~ May 2018

Gun and BPM NEG tube status:

After two days of krypton processing, the 200kV gun at UITF seems to be free of field emission at 200kV bias voltage. Need to start making beam to evaluate lifetime, photogun performance
Phil waiting for power supply repair, to finish NEG coating of two modified M20 BPMs and the solenoid nipple
Phil to get the bad modified M20 BPM repaired
Poelker to order clean krypton tank and regulator for dedicated gas processing system at CEBAF
Need to visit the tunnel to check the gun pump configuration, prepare for unusual plumbing to reach bake pump
Need to order the right HV cable for CEBAF, R350 to R28. Should not be as long as one in UITF
Matt/Danny to submit job to machine shop: spare 200kV shed electrode, tee with mushroom top, Bubba to polish it

Baked beamline with two-Wien spin flipper

media: baked beamline layout 12 December 2017.pdf
Danny to add another bellows near the spin flip solenoids
Danny to provide Z-locations of magnets and apertures
Joe to model the beamline with Elegant, check the optics when each Wien is set to 90 degrees, and when both Wiens are set to 90 degrees, while ensuring waist inside Wien#2
Joe to consider alternative layouts, with quads for improved optics when Wiens are at 90 degrees, and with shorter A1/A2 length, or apertures eliminated
Alicia to model Plan A layout using GPT, evaluate transmission for a variety of spin flipper settings
John to build +/-20kV Wien HV supplies, setup in UITF to drive the UITF Wien filter at "extreme" settings for long duration
Phil to install Wien magnet pair, choose the pair without shorts. Work with Kevin Banks to drive these coils at extreme settings for long duration
Setup meeting with Jeff Dale, Jay Benesch, Joe Meyers and Danny to manufacture better Wien magnets

@@ Line 25: / Line 25: @@
 * Setup meeting with Jeff Dale, Jay Benesch, Joe Meyers and Danny to manufacture better Wien magnets
-** J. Grames working on setting up magnet hot checkout (K. Banks to terminate magnets near the gun, Wein, etc) polarity checks, B-magnitude measurements, etc
+[[File:beamline 12_12_2017.jpg|left|500px]]
-*Viewers
-** B. Freeman: "So from the viewer screen I put one button that will launch my application (adviewer) with the first viewer. Use the drop down menu in the left hand corner to scroll through camera feeds.  This will not be the final configuration of the viewer screen. I plan to add some more options for viewer applications. I will also document all of the URLs for each camera feed. But this should be enough to see the viewers. I have verified that they all work and connected to the "correct" viewer."
-*Video to control room, DONE!