2017-08-18

Diagonostic Development - K. Jordan
Kevin: My time was split between being evicted from the FEL trailers & LCLS-II CM testing @ LERF There was a review by John Galada & Mark Ross for the feasibility of using the LERF as a cryodule test bed. I presented the logistics. slides are at: https://www.jlab.org/indico/event/233/ Next week is IBIC2017 & Vacaction

Joe:

• Moving was the big event.
• Worked on imaging setup for the GTS viewer to image a 4mm x 3mm object
• Worked on verifying the 2C20 optics
• Had the VUV turning vessel and the UV collimator removed
• A little work on the LCLS2 test, mainly with survey

Mike T

• Trying to recover some rusty analytic skills in understanding Synchrotron Radiation;
• Supplying Joe Grames with some material for his NSTAR presentation related to positrons at JLAB, and with JPOS17 talks;
• Mostly helping Yan Wang, Riad, and Mamun understand their attempts at measuring low electron beam emittances.
• I think I have a hold on the core ideas for a worthwhile pedagogical note concerning Thomas precession and its relationship to the S.R. spectrum. It's been 90 years since Thomas identified this precession. *We may not yet really understand what it means.
• I'm giving our injector staff what I believe to be some useful perspective on (1) what it means to measure something, and (2) how important it is to keep in mind the limitations of the equipment and the domain of validity of both the analytical techniques and the equipment.
• They ran into two resolution limits in viewer-based emittance measurement, first for the camera, and second for the YAG screen(!). They had also not yet understood certain subtleties in their data analysis concerning which measurements constrained which physical parameters. They were trying to apply various published measurement procedures without understanding why their attempts had fallen short of clarity. I think everyone has had some benefit from the time spent.