Ionization Effects - February 12, 2019

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Meeting Info

We will meet Tuesday February 12 at 11:00 am EST in TL 2236.
Wiki: https://wiki.jlab.org/ciswiki/index.php/Ionization_Effects_-_February_12,_2019

For those calling in we'll use the Blue Jeans [1] audio conference system.

Meeting ID: 366850636# 
Meeting URL (for video and/or audio call in): http://bluejeans.com/366850636
Phone number (for audio call in): 1-888-240-2560

Topics

Background
2017 Experiment @ CEBAF => scale laser area to achieve longest lifetime at >1 mA from hgh p

Paper Outline

Motivation for high polarization at high current (implies longest achievable lifetime)
Experimental Conditions (GaAs/GaAsP, tee shape electrode w/ grounded anode, rf pulsed IR laser)
Injector Test Facility (anode + vacuum)
CEBAF (anode + vacuum + radiation + apertures + polarimetry)
Results
Injector Test Stand Results => 1mA and 4mA studies w/o polarimetry
CEBAF QWeak performance applying laser scaling, then operating 1-2 years @ 0.2mA w/ online polarimetry
CEBAF Scaling Experiment to achieve longest lifetime (>1000C) at >1 mA

Simulation Studies (IBSimu, GPT, Simion)

Characterize


Background Material

Ion impact degradation of GaAs photocathodes
2018 Experiment to exploit increase of laser area to achieve >100C at >1mA from high polarization photocathodes