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E313 Spectrometer optimization

E313 Spectrometer optimization. Maximiliano Sioli. General considerations. We want to optimize the magnetic spectrometer with the (financial?) constraint that it has to be a “Downstream Dipolar Magnet Spectrometer” (DDMS)

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E313 Spectrometer optimization

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  1. E313Spectrometer optimization Maximiliano Sioli

  2. 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:

  3. DDMS for the near detector LAr Fe x (cm) • 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): z (cm)

  4. DDMS for the near detector 44% 1° arm: 24 slabs 2.5 cm thick 2° arm: 12 slabs 5 cm thick 29% 27% 1 2 • 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)

  5. Muon range • 5 x 7.87 / 0.106 = 374 • p ~ 180 MeV • T ~ 100 MeV • DT ~ 30 MeV • 2.5 x 7.87 / 0.106 = 187 • p ~ 120 MeV • T ~ 55 MeV • DT ~ 15 MeV

  6. Charge measurement All PmvsZstop EmvsZstop

  7. Charge measurement h B = 0.5 T B = 1.0 T B = 1.5 T Iron thickness Method: bending angle

  8. Charge measurement h B = 0.5 T 1 cm resolution for 250 GeV/c muons (~10 cm) B = 1.0 T 1 cm resolution for 750 GeV/c muons (~50 cm) B = 1.5 T Iron thickness Method: sagitta

  9. Charge measurement LAr

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