Hi all,
I was looking into the code of GBRAHMS to figure out various geometry
stuff of the silicon strips in the multiplicity array, and found
something a bit puzzling.
When the 7 strips are put into thier box, four of them overlap, and
three touch. Is this right? The code I'm refering to is in
src/global/eg_si.F:
call gspos('STRA', 1, 'SBXB', 0.0, 0.0, -2.58, 0, 'ONLY')
call gspos('STRB', 1, 'SBXB', 0.0, 0.0, -1.75, 0, 'ONLY')
call gspos('STRC', 1, 'SBXB', 0.0, 0.0, -0.86, 0, 'ONLY')
call gspos('STRD', 1, 'SBXB', 0.0, 0.0, 0.00, 0, 'ONLY')
call gspos('STRE', 1, 'SBXB', 0.0, 0.0, 0.86, 0, 'ONLY')
call gspos('STRF', 1, 'SBXB', 0.0, 0.0, 1.75, 0, 'ONLY')
call gspos('STRG', 1, 'SBXB', 0.0, 0.0, 2.58, 0, 'ONLY')
Since the width of each strip is 0.86 cm, this means that strips STRA
and STRB overlap width 3 mm, as does STRF and STRG. On the other hand,
strips STRC and STRD touch, as do STRD and STRE. Isn't this erroneous?
I should think the code should be:
call gspos('STRA', 1, 'SBXB', 0.0, 0.0, -2.58, 0, 'ONLY')
call gspos('STRB', 1, 'SBXB', 0.0, 0.0, -1.72, 0, 'ONLY')
call gspos('STRC', 1, 'SBXB', 0.0, 0.0, -0.86, 0, 'ONLY')
call gspos('STRD', 1, 'SBXB', 0.0, 0.0, 0.00, 0, 'ONLY')
call gspos('STRE', 1, 'SBXB', 0.0, 0.0, 0.86, 0, 'ONLY')
call gspos('STRF', 1, 'SBXB', 0.0, 0.0, 1.72, 0, 'ONLY')
call gspos('STRG', 1, 'SBXB', 0.0, 0.0, 2.58, 0, 'ONLY')
Also, it seems that there are 40 scintilator tiles in the multiplicity
array, including the four that shield the FS. That can't be right can
it?
Anyway, just a few observations on my part.
Cheers,
Christian -----------------------------------------------------------
Holm Christensen Phone: (+45) 35 35 96 91
Sankt Hansgade 23, 1. th. Office: (+45) 353 25 305
DK-2200 Copenhagen N Web: www.nbi.dk/~cholm
Denmark Email: cholm@nbi.dk
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