[Mott] next meeting, Wed July 29th @ 1:30pm EST

[Joseph Grames]

EGAD!  I meant 29th.  Wed July 29th!!!

----- Original Message -----
From: "Joseph Grames" <grames at jlab.org>
To: mott at jlab.org
Sent: Friday, July 17, 2015 9:46:40 AM
Subject: [Mott] next meeting, July 27th @ 1:30pm EST

Let's meet again on Wed July 27th at 1:30pm EST in TL-2236.

One or more of the efforts below could be discussed...

1. Dan - Based on three sets of runs (Run1, Marcy's calibration set, Joe's calibration set) determine elastic rate per detector vs. target thickness.  Elastic rate means applying same cuts (fixed delta-time, then reasonable energy sigma) and normalizing to (time*intensity) product for the run groups, using either (both?) FADC or Scaler macro.  You can use both Lebow and FESEM target thickness, whichever makes sense.  Also, now that you've developed good tools can you extend your sensitivity studies of energy cuts (i.e. use same time cut) to look at ~1 sigma slices of asymmetry e.g. -2 sigma to +4 sigma.  The question is:  how does asymmetry vary with slice?  At this point you probably don't need to show us all the spectra, unless as an example, but focus on the summary plots.

2. Marcy - Based on the images we have (i.e. not planning to do more measurements) you are re-evaluating the FESEM image analysis to find the best way to quantify a systematic thickness and uncertainty from each image file, i.e. some of the limited number of images are better than others.  The idea here is to compile a summary of the recipe used from start to end of process, and a table breaking out the systematics in a way which we can apply to all the foils.  Based on Dan's chi-square table posted ~recently suggests either measurement uncertainty ~somewhat underestimated (makes sense) or fit function not ideal (makes sense too).

3. Xavier - You are working on calculation the size of the self energy correction, the idea being that you are confident the vacuum polarization and self energy correction are of opposite, but may not cancel as well as speculated or suggested.

4. Marty - You are working on efficiently implementing -double scattering; we discussed meeting at JLAB or in DC to have a working meeting, map out options.  I'll be gone week of July 20th; can you suggest a date that would be convenient to do this...?

5. Joe - We are ~halfway through the summer shutdown.  The updated accelerator schedule suggests next window of opportunity would be in ~October; this gives us another 2-3 weeks beyond original period for Run 2.  We'll need to decide by middle of August what we might want to do in October.

Joe
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