April 24, 2020 - ME/INJ/CIS/CASA

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Meeting Info

We will meet Thursday @ 10am EDT via BlueJeans
Meeting URL (for video and/or audio call in): https://bluejeans.com/909497334
Phone number (for audio call in): 1-888-240-2560
Meeting ID: 909497334#

Status updates

Vacuum
  • Viewer solution on Y-chamber => long viewer or tack weld tube
  • Add Capacitorr 100's to NEG crosses, do they fit
  • Wien quad cross solution (buy 3)
  • Translate 133W SS power to Cu cavity
  • Attaching coils to A1/A2 cubes (what's left to order)
  • Sign off on bellows quote increase, Joe!!!
Magnets
  • PSS coil design change to meet rise time requirement
  • Solenoid ETI decision
  • QW's running near limit
Models
  • beam sim. friday
  • Wien calcs vs. measurements

Last Week's List

  • Review the ME layout, it's coming together!
* Apr 07, 2020 media:beamlinelayoutapril7.pdf puzzling A1/A2 layout, moving FX 2" upstream
  • Existing April 2020 injector quick reference
Thanks, Daniel => media:12GeV_injector_quick_reference_rev16.pdf
  • Asking Christian Whalen S&R if we can ship small parts to home:
This was proposed at the beginning of this crisis and the answer was no. We currently are coming in to the lab to do processing of Received item on Fridays from 8am to 5pm and pass them out to folks that come to S&R. We’ve worked out a way to sanitize the packages and keep the social distancing rules to keep everyone safe.
  • Lakshmi model of longer rectangular PSS kicker magnet on spool
My recent calculation shows a significant benefit ( reduction in the resistive load with less turn counts) by increasing the overall length of the rectangular coil for example from 50 mm ( as per the input of the kick off meeting) to 70 mm and a modification of coil cross-section. Let me refine the rectangular coil geometry and get back you with better results.
  • Status on parts deliveries
:MDC BPMs/Spools arriving 4/13-4/16, contact Whalen to put stuff in 1137
:Solenoid fixtures (deliveries & distributions on Friday's)
  • Technicoil Wien coils status
OneDrive folder
  • Alicia is using Jay's Wien field maps here:
/a/opsuser/benesch/magnets/inj_maps
README_wien
Wien_B_90G.txt
Wien_E_13333V_cm.txt
  • Gary knocking out fixture drawings:
Section 1		
:Section 1 solenoid assembly	https://misportal.jlab.org/jlabDocs/document.seam?id=124779&cid=6640
:Solenoid fxiture itself	https://misportal.jlab.org/jlabDocs/document.seam?id=124780&cid=6649
:Solenoid fixture spacer	https://misportal.jlab.org/jlabDocs/document.seam?id=124781&cid=6654
Section 2	
:MFX solenoid fixture assembly	https://misportal.jlab.org/jlabDocs/docDownload/125005
:Y-Laser chamber girder holes	https://misportal.jlab.org/jlabDocs/docDownload/100043
Section 3		
General		
:Ion Pump support bracket	https://misportal.jlab.org/jlabDocs/docDownload/125003
:Ion pump vee block	        https://misportal.jlab.org/jlabDocs/docDownload/125006
:Vee block angle 5"	        https://misportal.jlab.org/jlabDocs/docDownload/125004
:Vee block angle 2"	        https://misportal.jlab.org/jlabDocs/docDownload/125000
Now on Link to AIPINJ OneDrive folder, then they're in the "20.03.26 Beamline Screen Shots".
MFX before A1 moves further upstream on spool
A2 is now a cube, instead of a cross
harp before A2 is rotated 45 deg CW looking downstream, there is a viewer on it too
  • Danny working w/ MDC so their BPM shop drawings match his submitted drawing
the BPM cans from MDC are due to ship april 13th.
  • Joe finding status of BPM feed through delivery
Requested date is 4/25
the BPM antennae are due to ship: a quantity of 7 in three weeks, the balance on may 7th.
  • ME working on finishing solenoid fixture designs
  • Marcy checking on top hat configuration for Y-chamber media:200326_viewer shield.pdf
  • ME can go ahead order spools for Sections 2 & 3
  • Shaun add "stay clear" zone of camera to model
Joe measured 4" dia x 6" length tube
  • Danny check with Milhous & Jlab people for dipole design
Yes, nice examples. Jay OK. Joe OK. Req submitted & signed
  • Reza talk out with Curt or Rick about power needed and controls desired
  • DP can, will new $$$ NEG's fit or not
  • Marcy get quotes on A1/A2 cubes and 6-way cross w/ R-R
  • Decide on A1 media:200326_aperture 1.pdf insert depths
  • Finalize A2 media:200326_aperture 2.pdf in layout, need to wind coils now too
  • Scott figure out how to control [1], set limits, positions, use encoder w/ stac5
ordered a stac5
  • Let Joe Meyers know what color to paint solenoids
Lime
  • Riad - will magnetic field of first coil reach photocathode? will it affect solenoids?
Field map: media:BH_Haimson_Coils.xlsx => Field extends to 8 cm from center of magnet.
  • Carlos/Gabriel evaluate model for smaller gap Wien filter
  • Lakshmi status of PSS coil models
  • Dennis turn elegant model values into expected magnet currents.
Using the 2020-03-26 layout: Media:magnet_currents.ods


Follow-up meeting - CEBAF vacuum modeling