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Plan for measuring the photon beam spot characteristics

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Submitted by:
Richard T. Jones
Updated by:
Richard T. Jones
Document Created:
13 Oct 2017, 11:47
Contents Revised:
13 Oct 2017, 11:47
Metadata Revised:
13 Oct 2017, 11:47
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06 Nov 2017, 06:24
In this talk, I review the present state of our knowledge of the polarization of the coherent bremsstrahlung beam in Hall D. Many systematic issues that were observed during commissioning have been resolved with the help of data collected in Spring 2017. The leading source of remaining uncertainty is believed to come from the unknown virtual beam spot profile at the collimator. Using our Monte Carlo model, we have a direct map between the observable photon beam spot profile and the virtual electron beam spot profile that controls it in our model. With the help of a fast raster, it will be possible to measure the photon beam spot profile with accuracy in less than 40 minutes.
Files in Document:
  • pdf slides (photon_spot_plan-10-2017.pdf, 4.8 MB)
Associated with Events:
held from 12 Oct 2017 to 14 Oct 2017 in Jefferson Lab
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