Minutes of E362 FD weekly meeting, 1996-Sep-17, 19:00 - 22:00, KEK R307.
Present:K.Nishikawa,T.Ishii,T.Kobayashi,T.Chikamatsu,A.Sakai,T.Inagaki(INS),
        K.Nakamura,M.Sakuda,Y.Oyama,T.Ishida(KEK),I.Lim,E.Jeong(Chonnam),
        M.Kohama(Kobe),K.Maruyama(Tohoku),M.Etoh(Tokai),M.Nakamura(Niigata)

(1) We have new members from Chonnam University (Korea). In-Taek Lim and his 
   master course student Eun-Mi Jeong. She wants to finish her thesis at the
   end of 1997.  
(2) Beam 
Maruyama calculates the energy spectrum of nu_mu and nu_e using FLUKA model.
The nu_e flux is new. At 10**20 POT, nu_mu (nu_e) fluxes at FD and SK are 
3.9x10**12/cm**2 (3.4x10**10/cm**2) and 3.0x10**6/cm**2(2.2x10**4/cm**2).
He shows that nu_e flux is mainly from mu-decays and the contributuion of 
Ke3 decays is smaller by an order. <Enu_mu>=1.5GeV and <Enu_e>=1.4GeV.
He will calculate the flux using Sanford-Wang model for comparison. 

(3) SCIFI 
* Etoh shows how to calibrate the fiber positions using an LED sheet. 
 He reported last week that CCD sees 82mmx95mm area of IIT window. 
 From Hamamatsu's information, it is reasonable except for the top 5mm area. 
 The present coverage is good enough IF we know the boundary accurately and
 the efficiency is uniform over the erea. If it is not the case, broader 
 coverage is necessary. Sakuda shows that one fiber is seen by about 2x4 
 pixels. Hamamatsu can adjust the center of the CCD and broaden the 
 coverage by another 10-20%. 
*Etoh is now preparing for the measurement of the absolute efficiency (=light 
 yield). 
*SuzukiAT reports the status of a new fiber spooling machine via email.
 Kawai/Ishikawa(Nagoya) propose to build a lighter drum structure. 
 They will establish the method in October.

(4) Veto/TOF system (Veto surronds SCIFI and TOF is in front of Muon ranger)
A first design for Veto/TOF counter system, based on Sasaki's idea,
is explained by Sakuda. Sasaki proposes to use TMC module (Time Memory Cell, 
Y. Arai's Trade-mark) for Veto/TOF system. TMC can keep all of the timing
history with accuracy of 0.5ns over 2micro-sec after the trigger signal 
(=start signal of the beam gate) is fed. Since the beam gate is about 1micro
sec, this is good enough. We can keep all Charged current and Neutral current
events. The correspondence between muon chamber time and TOF (t0 for the
drift time), for example, must be obtained later at the offline on an 
event-by-event base. He thinks that this scheme of FD matches the present
SK trigger scheme and thus 1kton detector.
  We have only 96 TOF counters which covers 1/2 of muon ranger face and 
100 PMTs. We need to optimize the width and the thickness of the counters.
The thisckness mainly determines the light yield and thus the time resolution. 
The cost of scintillator is proportional to the thickness (the area that we 
must cover is the same). The width (=granularity, 20cm or so) determines 
the number of PMTs and TMCs. We need about 400 channels in total. 
Cost of one TMC (32ch) is about 400,000yen. 
 We must take 96 TOF counters from VENUS in October. 
       
(5) Muon chambers 
Ishii reports:
*SAAN Co. says that it takes three months to get the VENUS gas circulation 
 system work again. The cost estimation will be given soon. 
*Chikamatsu reports the gas leak rate for all F/B chambers. Ishii must show
 the expected leak rate of the system at the safety committee next week.
*They need 3 weeks shift work to finish removing all electronics boards and
 complete the leak test. Ishii will send us a shift table.

 Chikamatsu shows the muon energy spectrum using GEANT simulation when 1kton
detector is combined with muon ranger. The muon energy below 1 GeV is measured
by 1kton detector itsself and that above 1.5GeV can be measured by muon ranger.
About 80% of the spectrum can be measured.

(6) LG calibration 
Kobayashi will establish the calibration method for 3x3 blocks within this 
year. He proposes to use INS electron beam to obtain the absolute energy
scale from 3x3 blocks and use the cosmic-rays to calibrate the relative gains
for the remaining 600-1000 blocks. He asks INS workshop to make the structure 
for the test. 

Others:
*KEK OPEN HOUSE was held on September 15(Sunday). About 3500 people visited 
KEK. About 1000 people came to PS experimental hall, including E362 experiment.
Nakamura gave a lecture on "Neutrinos" at the Seminar Hall. 
*Transfer 1kton tank from the present position to another place close to our
 experimental hall (Taino et al.). 
*Software meeting on Sept 19.

****E362 Collaboration meeting on November 1*******
//(Memo by Sakuda)