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

[Narbe Kalantarians]

-------- Original Message --------
Subject: 	Re: [Sane-analysis] Minutes of Dec 15 SANE Analysis Meeting
Date: 	Thu, 16 Dec 2010 16:35:50 -0500
From: 	O. A. Rondon <or at virginia.edu>
To: 	Narbe Kalantarians <narbe at jlab.org>
CC: 	SANE Analysis <sane-analysis at jlab.org>



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



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