[G12] Beam Intensity vs MOR rate - G12_wiki

[Paul Eugenio]

Hi Eugene,

We are looking into several issues we have regarding cross section estimates.  One concern we have is with the photon normalizations.   I agree that the MOR is not the viable estimate of any intensity depend sag to the live time.  G12 ran with the highest photo intensity of any run, and earlier studies using g11 data showed a gflux calculated live time which had a dependence on the beam flux.    In order to correct this, the live time corrections where applied twice (as shown by M. Williams).    I do not know if gflux code was corrected or if it needed to be corrected.   Should we apply this correction twice for g12?  


--
Prof. Paul Eugenio
Florida State University
Department of Physics
Tallahassee, Florida,  USA 32306

(850) 644-2585
eugenio at fsu.edu



On Feb 8, 2011, at 9:38 AM, Eugene Pasyuk wrote:

> 
> We also have individual EPICS scalers for every tagger PMT.
> They are better monitor than MOR.
> 
> -Eugene
> 
> 
> On 02/08/11 09:33, John Price wrote:
>> Sounds like we need the output of gflux as a function of beam current...
>> 
>> On Tue, 2011-02-08 at 06:29 -0800, Eugene Pasyuk wrote:
>>> MOR rate is not reliable intensity monitor. It is logical OR, it is NOT
>>> arithmetic sum of all counters.
>>> It saturates and eventually goes down when you increase flux.
>>> 
>>> -Eugene
>>> 
>>> 
>>> On 02/08/11 09:24, Paul Eugenio wrote:
>>>> Hi,
>>>> 
>>>> I dug out the data from the beam intensity study which was done during the run.    Performing a linear fit to the first few points shows that at 60 nA the MOR rate sags by about 8%.
>>>> 
>>>> http://clasweb.jlab.org/rungroups/g12/wiki/index.php/Beam_Intensity_vs_MOR_rate
>>>> 
>>>> --
>>>> Prof. Paul Eugenio
>>>> Florida State University
>>>> Department of Physics
>>>> Tallahassee, Florida,  USA 32306
>>>> 
>>>> (850) 644-2585
>>>> eugenio at fsu.edu
>>>> 
>>>> 
>>>> 
>>>> 
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