Stability (fitted beam center)

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Presentation transcript:

Stability (fitted beam center) Silicon x Chamber x RMS: 3.0 mm RMS: 4.3 mm Center values are different by ~1cm. Need check! Silicon y Chamber y RMS: 1.9 mm RMS: 2.4 mm (MUMON intrinsic fluctuation estimated by S/N is ***mm )

Stability (beam direction) (MUMON center)/(Dist.from target) √ (x2 + y2) Beam axis No time dependent drift Beam direction was tuned well within 1 mrad. Monitor alignment should be checked. Further turning in Jan.

Stability (flux) incl. stability of beam+horn field+MUMON Silicon Chamber RMS/Mean: 0.8% RMS/Mean: 0.8%

Stability (flux) cont’d. CT normalized Silicon Chamber RMS/Mean: 0.5% RMS/Mean: 0.50% 0.5% is same as the CT stability by Shibata-san stability of MUMON+(horn field) < 0.5% MUMON intrinsic fluctuation estimated by S/N is ***%

Stability (flux) incl. beam+horn field+MUMON No time dependent drift

Absolute muon flux estimation Two strategies in addition to the emulsion measurement Energy deposit calculation by MC. Get the relation btw. muon flux and energy deposit in the detector Calibration by electron beam test Under study. Preliminary study indicates consistent result w/ A)

Estimation from MC energy deposit Energy deposit by all particles is summed up and divided by #muons Contrib. from d-rays generated outside detector and escape of d-rays generated inside detector are taken into account Edep = 2420 MeV/(15266 muons) = 158.5 keV/muon Ionization yield: Q = Edep / 3.6 eV x e0 = 2.08 x 10–4 pC/muon  Silicon factor: 141.9 muon/pC Energy deposition in the silicon (MC) 2420 MeV *Relying on estimation of d-ray contribution by Geant3. Bare Si measurement confirmed that the d-ray contribution is robust(~1% effect) against materials around.