[G14_run] linear polarization for 5 pass

[Eugene Pasyuk]

Hi Ken,

The nominal setting is actually 2.2 GeV. From what I can see so far the 
peak position is much more stable for both orientations than in all 
previous runs. The shape is also very similar for PARA and PERP.
I guess new diamond made a difference.

-Eugene


Ken Livingston wrote, On 04/08/12 17:07:
> Hi All,
> The linear polarization fits for runs 69202 and 29203 (PARA and PERP
> 2.1GeV, Ebeam  = 5.551GeV) are here:
> http://nuclear.gla.ac.uk/~kl/g14/PARA_2100_5551.gif
> http://nuclear.gla.ac.uk/~kl/g14/PERP_2100_5551.gif
>
> Peak polarizations are about PARA=80% and PERP=78 %.
>
> All seems reasonable.
>
> Cheers,
> Ken
>
>
>
>
> On 04/08/2012 11:35 AM, Ken Livingston wrote:
>> Hi All,
>> I made a rough fit to some of the collimated data with linear
>> polarization from the test we had 4pass beam.
>> The fractional energies we ran at were about the same as those which
>> will be used for 5 pass beam.
>> ie E_edge_4pass ~ 4/5 * E_edge_5pass
>>
>> The results look good:
>> http://nuclear.gla.ac.uk/~kl/g14/
>>
>> The peak polarization is ~86% at the lowest energy setting, dropping to
>> ~81% at the highest energy setting.
>> PARA is slightly broader than PERP, as we saw online.
>>
>> For all peak positions the mean polarization should be over 75%.
>> At 5 pass the results should be the about same.  I'll produce some
>> similar plots for the 5 pass data soon.
>>
>>
>> Cheers,
>> Ken
>>
>
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