UITF Meeting - December 4, 2017

UITF first beam on a viewer by December 22 2017

Prep chamber and Gun:

Loaded fresh bulk GaAs cathodes on puck 22 and 14, plus one strained GaAs in storage manipulator.
Both gun and prep chamber baked after replacing Cs channels and NF3 leak valve.
Gun high voltage conditioning in progress
Successfully activated a bulk GaAs photocathode link Details here

What else to make “simple” beam?

Updates on Epics control of:

Valves
Magnets
UED
- M. Joyce: "UED is populated with new KeV and KeVDump beam line"
- As-built keV beam line component sequence in UED
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!
- See entry from C. Norris: link Viewer images in control room
Current monitoring at cup, dump and apertures. Cables connected to ammeters
Gun HV control: DONE!
UHV ion pumps: DONE!
Decarad (in progress)
Water flow signal to fsd card
What else to fsd card? BLM
- Need to make sure all isolated structures are properly grounded (50 ohm termination) if not to be used during first beam tests.
RF to seed laser
Attenuator
Power meter
x/y stage
tune mode generator
SCAM
Epics screens

What else later? By Feb 5, hopefully sooner

By February 5, 2018

To do:

Get another shed electrode made, since we will need this electrode for the gun we pull from the tunnel
GN2 manifolds, clean polyflo
Tools, tool boxes
Vacuum cabinet, with vacuum hardware
Aluminum foil
Dress ion pump cables

R&D at UITF

mA polarized beam lifetime tests, lifetime vs laser spot size (continue Joe’s work)
Other lifetime studies: vs gun voltage, vs active area (3, 5, 7 mm), vs color of light, vs photocathode thickness and cleave plane, bulk vs superlattice
Lifetime vs oxidant (NF3, N2O, O2)
GaAs activated with Cs and Li: bi-alkali lifetime tests
Wein as precipitator
GaAs/GaAsP with and without DBR, GaAsSb/AlGaAs, and GaAsSb/AlGaAsP photocathode lifetime tests
Add an H-cleaner to the prep chamber
Brock cavity bunchlength measurements, vs buncher power, pump/probe test

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