e313 spectrometer optimization
Post on 31-Dec-2015
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E313Spectrometer optimization
Maximiliano Sioli
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General considerations• We want to optimize the magnetic spectrometer with the
(financial?) constraint that it has to be a “Downstream Dipolar Magnet Spectrometer” (DDMS)
• The previous statement is necessary since for such an experiment the best would be a spectrometer à la UA1/NOMAD:
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DDMS for the near detector• Given the relatively low energy muon beam, we now focus on the
possibility to build a “compact” DDMS which uses a unique detector (e.g. RPC) interleaved with variable-thickness iron slabs.
• Method:– FLUKA simulation of the LAr target + down stream “infinite” iron block– Muon vertex and kinematics from Stefano simulation– Store all muon stopping points
• Result(top view):
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x (cm)
z (cm)
FeLAr
DDMS for the near detector• Statistics:
– Total number of muons: 14767– Muons stopping in LAr or Fe: 14360– Muons stopping in Fe: 8865– ... and with at least 10 cm penetration: 7457– ... and with |Dx|<8.7/2 m & |Dy|<5.7/2 m: 4657 (norm)
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44%
29%
27%
1 2
1° arm: 24 slabs 2.5 cm thick2° arm: 12 slabs 5 cm thick
Muon range
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5 x 7.87 / 0.106 = 374p ~ 180 MeVT ~ 100 MeVDT ~ 30 MeV
2.5 x 7.87 / 0.106 = 187p ~ 120 MeVT ~ 55 MeVDT ~ 15 MeV
Charge measurement
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Pm vs Zstop Em vs Zstop
All
Charge measurement
Method: bending angle
B = 1.5 T
B = 1.0 T
B = 0.5 Th
Iron thickness
Charge measurement
Method: sagitta
B = 1.5 T
B = 1.0 T
B = 0.5 Th
Iron thickness
1 cm resolutionfor 250 GeV/c muons(~10 cm) 1 cm resolution
for 750 GeV/c muons(~50 cm)
Charge measurement
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LAr
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