1. 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 )

2. 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.

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

4. 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 ***%

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

6. 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)

7. 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) = keV/muon
Ionization yield:
Q = Edep / 3.6 eV x e = 2.08 x 10–4 pC/muon
 Silicon factor: 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.