Difference between revisions of "Laser Size Paper - Nov 8, 2019"

Latest revision as of 17:29, 6 December 2019

Meeting Info

We will meet Friday Nov 8 in TL-2221.
Meeting ID: 838158220# 
Moderator Passcode: 2864
Meeting URL (for video and/or audio call in): http://bluejeans.com/838158220
Phone number (for audio call in): 1-888-240-2560

What are the questions we'd like to answer in the paper ?: media:191108_ion_paper.pptx

Background Material: PRAB (lifetime studies w/ bulk GaAs) media:high current lifetime_in print.pdf; PSTP17 (lifetime study w/ GaAs/GaAsP) media:PSTP2017_Grames_v1.pptx media:PSTP2017_Grames_Final.pdf

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 == Meeting Info ==
-  We will meet Friday Nov 8 in TL-2221..
+  We will meet Friday Nov 8 in TL-2221.
+  Meeting ID: 838158220#
-== For those calling in we'll use the Blue Jeans [https://cc.jlab.org/bluejeans] audio conference system. ==
-  Meeting ID: 366850636#
   Moderator Passcode: 2864
-  Meeting URL (for video and/or audio call in): http://bluejeans.com/366850636
+  Meeting URL (for video and/or audio call in): http://bluejeans.com/838158220
   Phone number (for audio call in): 1-888-240-2560
-== Topics ==
+;What are the questions we'd like to answer in the paper ?
+:[[media:191108_ion_paper.pptx]]
 ;Background Material
 :PRAB (lifetime studies w/ bulk GaAs) [[media:high current lifetime_in print.pdf]]
 :PSTP17 (lifetime study w/ GaAs/GaAsP) [[media:PSTP2017_Grames_v1.pptx]] [[media:PSTP2017_Grames_Final.pdf]]
-== Paper Outline ==
+[[Ionization Effects Meetings | Return to Ionization Effects Meetings]]
-;Motivation for high polarization at high current
-: Requires useful long operating lifetime (e.g. 2mA is 1200C/week)
-: QE uniformity important for beam quality, especially parity violation experiments
-: Applications: Electron Ion Collider (>50 mA), Polarized Positron Source (>10mA) or Moller Standard Model test (>0.2 mA)
-;Experimental Conditions (GaAs/GaAsP, tee shape electrode w/ grounded anode, rf pulsed IR laser)
-:Injector Test Facility (anode + vacuum) => first 1 and 4 mA demos (in proceedings, unpublished)
-:CEBAF (anode + vacuum + radiation + apertures + polarimetry) => CEBAF performance, laser scaling (in proceedings, unpublished)
-;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 Compton polarimetry vs. QE
-:CEBAF Scaling Experiment to achieve longest lifetime (>1000C) at >1 mA
-:CEBAF Polarization Experiment to measure polarization up to 1mA
-;Simulation Studies (IBSimu, GPT, Simion)
-:Ion impact distribution at photocathode (#, energy, position) for CEBAF gun/geometry => demo how scaling depends upon optics
-:Electron beam distribution => demo how "too large" beam size leads to e-beam losses (validates radiation) to assess impact (gun vs. downstream)
-:GPT vs. IBSimu => not necessarily for paper, but for training and benchmarking?
-; Outlook & Conclusions
-== Background Material ==
-;  Ion impact degradation of GaAs photocathodes
-* J. Grames, R. Suleiman, P. A. Adderley, J. Clark, J. Hansknecht, D. Machie, M. Poelker, and M. L. Stutzman, "''Charge and fluence lifetime measurements of a DC high voltage GaAs photogun at high average current''", [http://journals.aps.org/prstab/pdf/10.1103/PhysRevSTAB.14.043501 Phys. Rev. ST Accel. Beams '''14''', 043501 (2011)], [[media:high current lifetime_in print.pdf]]
-; 2018 Experiment to exploit increase of laser area to achieve >100C at >1mA from high polarization photocathodes
-* Joe Grames, Phil Adderley, John Hansknecht, Reza Kazimi, Matt Poelker, Daniel Moser, Marcy Stutzman, R. Suleiman Shukui Zhang "Milliampere beam studies using high polarization photocathodes at the CEBAF Photoinjector" [[media:PSTP2017_Grames_v1.pptx]] [[media:PSTP2017_Grames_Final.pdf]]

Difference between revisions of "Laser Size Paper - Nov 8, 2019"

Latest revision as of 17:29, 6 December 2019

Meeting Info

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