[Sane-analysis] Minutes of Dec 15 SANE Analysis Meeting

[O. A. Rondon]

Comments on the minutes:

> _*Hovhannes/Mark/Oscar:*_ Looking into the issue of the target's
> magnetic field. It seem that in the GEANT-MC the field is possibly in
> the opposite direction. This means that the tracks are being bent in the
> opposite direction of where they should be. Hovhannes ran MC with field
> directions of +/-80 and 100 degrees. In this context, looking
> downstream, positive implies left of beam and negative  right of beam.
> Oscar ran his stand-alone code and noticed that the beam has the same
> deflection for +80 and -100, but opposite for -80.
> http://www.jlab.org/~rondon/sane/analysis/asym/a80_4.7_2/?C=M;O=D

Minor correction: same deflection for -100 and -80 deg. (notation of
minutes) or 100 and 80 deg. (Oscar's standalone code notation). Posted
files are labeled with 100 and 80 notation indicating left of beam line,
looking downstream.

> Suggested cut on theta (for BETA) ~+40 ± ~1 deg and look at the
> deflections GEANT gives for scattered electrons of 1.714 GeV for +80 and
> -80 and compare with his bdl numbers. The idea of whether the target
> assembly might have been rotated to actually +100 degrees was discussed
> but it seemed unlikely due to the likeliness of the HMS acceptance being
> block by one of the coils.
> http://www.jlab.org/~rondon/sane/mtg13/sane_2007_0330.pdf (see slide 6).
> 

Cheers,

Oscar