[Halld-offline] Beam Polarization

[Paul Mattione]

Well, if we were to fit the polarization many different times within a run, we would need a mechanism for storing, and then looking up, the fit results relevant for each given range of events.  Do we have a mechanism that can do this yet?  Or am I thinking about this wrong? 

 - Paul

On Feb 22, 2016, at 8:30 PM, Curtis A. Meyer <cmeyer at cmu.edu> wrote:

> Yes, but it does depend on the photon energy. E.g. how far away from the coherent edge are you?
> Events near the edge will have the highest degree of linear polarization, while those far away will
> have less. If the edge is stable, the function is pretty simple., but we still need to be able to assign
> both a polarization and a polarization direction to our photons on an event-by -event basis.
> 
> Curtis
> ---------
> Curtis A. Meyer			MCS Associate Dean for Faculty and Graduate Affairs
> Wean:    (412) 268-2745	Professor of Physics
> Doherty: (412) 268-3090	Carnegie Mellon University
> Fax:         (412) 681-0648	Pittsburgh, PA 15213
> curtis.meyer at cmu.edu	http://www.curtismeyer.com/
> 
> 
> 
>> On Feb 22, 2016, at 8:25 PM, Paul Mattione <pmatt at jlab.org> wrote:
>> 
>> I was under the impression that, for a given beam energy, the polarization would be relatively constant over the course of a run.  
>> 
>>  - Paul
>> 
>> On Feb 22, 2016, at 8:22 PM, Curtis A. Meyer <cmeyer at cmu.edu> wrote:
>> 
>>> Hi Everyone,
>>> 
>>>   I am not sure if we have this capability yet, but as we move forward we are going to
>>> want the REST files to contain the photon polarization. This is likely a function that
>>> we have to call when we have decided what the correct photon is, but we should have
>>> the hooks in place to do this on an event-by-event basis.
>>> 
>>> Curtis
>>> ---------
>>> Curtis A. Meyer			MCS Associate Dean for Faculty and Graduate Affairs
>>> Wean:    (412) 268-2745	Professor of Physics
>>> Doherty: (412) 268-3090	Carnegie Mellon University
>>> Fax:         (412) 681-0648	Pittsburgh, PA 15213
>>> curtis.meyer at cmu.edu	http://www.curtismeyer.com/
>>> 
>>> 
>>> 
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>> 
> 

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