[G14_run] comparison of pass0 v8 versus v9

[Peng Peng]

Hello Franz,

For the v9 data, even the gold2 get opposite sign for E asymmetry, but silver3 of v9 has same sign as before, what do you think could be the reason?

Thank you,
Peng
On Aug 26, 2013, at 10:31 PM, Franz Klein wrote:

> Peng,
> you presented a comparison of E asymmetries using pass0 version 8 and version 9 data and got exactly the opposite for the gold2 period.
> I tried to figure out the different settings we tried over the last 6 months: changing the helicity delays, considering 2nd half wave plate or not ...
> 
> The v9 helicity data obviously have corrections for the 2nd half wave plate, which does not make sense (at least in Hall C nor for Moeller runs in Hall B). Also: considering the 2nd H.W.P. caused a general sign change but did not help with solving the problems with the January data.
> I just commented out these lines - sorry I should have done it after our tests were done in May!
> 
> As pointed out in the last meeting: we'll wait for a few changes in DC calibrations and ST calibrations and will do another pass - neglecting pass0v9 completely.
> 
> Sorry,
> 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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