[Frost] helicity info in g9b data

[Michael Dugger]

Franz,

Thanks for the info.

If you know of a few runs that you are certain had circular polarization, 
that would be great. We are not interested in the actual helicity state of 
any event, instead we would like to try and see the azimuthal offset angle 
of the transverse magnetic field by looking at pion T asymmetry.

If you don't know of, or remember, which runs definitely had circular 
beam, we will just wait for you to finish investigating the situation.

Take care,
Michael

On Thu, 19 Jan 2012, Franz Klein wrote:

>
> Hi,
> this morning I claimed that the helicity information was correctly
> extracted for most of the runs ... but that was not correct: by chance I
> looked into cooked files where it worked!
> Since we had delayed reporting, in part by 8 helicity intervals, in part
> by 16 intervals, I have to get the correct sequence of helicity scaler
> events (or cannot resolve the helicity info for a given helicity
> interval). However, often the helicity info in the gated and ungated
> scaler banks did not match during g9b, so I have to figure out how to
> solve that over the next days ...
> This concerns ~60% of the cooked files (as you see by chance I didn't
> look into bad files ...)
>
> When I am done with that, I will write a wiki page about helicity info,
> etc. (similar to
> http://clasweb.jlab.org/rungroups/g14/wiki/index.php/Beam_Polarization_%28Circ.%29
>
> Greetings
> Franz
>
> ===============================================================
>                   Franz J. Klein, Associate Professor
>                   CUA, Department of Physics
>                   Washington, DC 20064
>   office: Hannan Hall 206          phone: 202-319-6190
>   or: Jefferson Lab,CC F-243       phone: 757-269-6672
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