[Halld-cpp] [EXTERNAL] Re: How much amorphous data should we take?

[Curtis A. Meyer]

Hi Elton,

    I think we have used the amorphous data to also check systematics when we analyze data away from the coherent peak. My guess is you probably need less than GlueX.

Curtis


Curtis A. Meyer | MCS Associate Dean for Research 
The Otto Stern Professor of Physics 
cmeyer at cmu.edu <mailto:cmeyer at cmu.edu> | 412 260 6290

Carnegie Mellon University 
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> On Jun 22, 2022, at 16:57, Elton Smith <elton at jlab.org> wrote:
> 
> Dear Hovanes, Mike, and others,
> 
> The CPP experiment has been considering how much data should be taken with the amorphous radiator and wanted to get your input. As you know, for GlueX we collected about 10% of the triggers on the amorphous radiator. 
> 
> As, I understand it, the main arguments for collecting data with an amorphous radiator  are a) to be able to normalize the coherent spectrum and b) check systematics of the polarization. We need very little data for a), but  how much data we need to address b)? Also, if there are other used for the amorphous radiator data, please send us feedback. 
> 
> We have already started taking data that can be considered production and all of it was taken using polarized beam. We will want to make a plan regarding how much amorphous radiator data we take so that it is interspersed with diamond radiator data. At the moment, we do not anticipate using the amorphous radiator data in the physics analyzes for CPP nor NPP.  
> 
> Thanks, Elton.
> 
> 
> ------------------------------------
> Elton Smith
> Jefferson Lab MS 12H3
> 12000 Jefferson Ave STE 4
> Newport News, VA 23606
> (757)269-7625
> 

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