E362 FD weekly meeting, 
KEK R306, 96/07/09 (Tues), 9:00-11:20 
Present:Nishikawa(Chairman),Chikamatsu(INS),Nakamura,Ohyama,Sakuda,Ishida(KEK),
        Maruyama(Tohoku),Nakamura(Niigata)

(1) Nakamura (Niigata) studies the effects of aluminum plates (2mm) of water 
container to the efficiency of nu_e+n->e+p events. He observes 20% reduction. 
He will further check the S/N.

(2) Chikamatsu shows the schedule of F/B muon chamber test. He has almost
prepared instruments and tools (valves, pressure gauge etc) for gas leak
test which starts this month. Shift work begins this month and continues 
till November(?).  
 He also revises the estimation of the efficiency of quasi-elastic events 
with a new geometry (LG in a cylindrical shape). He also estimates the 
background contamination of NC events to the quasi-elastic selection 
to be about 2%. 

(3)Maruyama calculates the radial profile (r) and angular distribution (theta)
of pions after the 2nd horn and checks the correlation of r and theta to 
the flux ratio SK/FD. He sees the stronger correlation of theta to FD/SK ratio
than that of r. He wants to design a Cherenkov detector to measure 
both r and theta distributions,  especially the ratio =
N-pi(theta>0.01rad)/N-pi(theta<0.01). Nishikawa's idea is to use this ratio 
to correct the flux ratio SK/FD. They will design a proto-type detector
and test it this fall. 

(4) Sakuda suggests that we should check the ambiguity of Sanford-Wang formula 
in the neutrino beam Monte Carlo more quantitatively. The present beam MC uses
Cho's parameter set without errors. It may be useful to know the effects on 
pion distributions at the monitor and neutrino spectrum arising from 
the uncertainty of this formula. 
 Ishida will estimate the errors of Cho's parameters by applying a MINUIT fit
to Cho's data. 

(5) Etou reports from Nagoya that they (Nagoya group, Kobe group and Etou) 
managed to make one sheet of fibers successfully although a new drum had
a mis-alignment problem. It will take at least 2 weeks to make all fiber sheets
necessary for a proto-type SCIFI detector.
// (Memo by Sakuda)