[Tpe] files for today's meeting

[Will Brooks]

Dear all,

 I have posted files from Cristian Peña´s studies at

http://www.jlab.org/~brooksw/pics/

It will be helpful if you take a look at them *before* the meeting.

The idea is to identify the volumes where the background gets made. Some 
sources are irreducible (e.g., the radiator) and others could still be 
improved a big (e.g., the blocker). Since the background can come from 
particles produced from the incident beam, or from secondaries, 
tertiaries, quaternaries, etc., he has broken part of the study up into 
'generations.' Thus, a particle causing a hit in a sensitive volume 
might have had a causal 'grandparent' in a volume upstream, etc. He 
shows a matrix of the causative volume vs. the particle type for 4 
generations of particles in the four folders found at the link above.

 Needless to say, it requires a little study to comprehend these plots, 
and it will be easier to understand if you take a look at it before the 
meeting. The volumes are identified by numbers. A partial dictionary is 
below:

1 tag_mag_log (12)
8 vacbox_log (21)
9 floorL1_log (10)
929 cryoring_log
930 coll_log (14)
960 blocker_log (46)
981 condenser_log (52)

second and third generation
958 hbag2_log
959 hbag1_log (50)

forth generation
983 target_log
984 target_mylar_log (50)

Thanks,

-  Will

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