Minutes of E362 FD weekly meeting
97/02/18, 19:00-21:00, KEK library meeting room,
Present:K.Nishikawa,T.Ishii,T.Chikamatsu,A.Sakai,T.Inagaki,S.Mine (INS), 
M.Sakuda,Y.Ohyama,T.Ishida(KEK),T.Maruyama(Tohoku), S-H.Ahn(Korea)
M.Etoh(Tokai),I-T.Lim,E-M.Jeong,K-J.Ma(Chonnam)
  
(1) TOF (Ohyama)
Ahn and Ohyama set up the system for a 4m long veto counter at Nikko. 
They will send some counters to Korea after they check what they need.

(2) Decay tunnel (Nishikawa)
The length of the tunnel of 2m diameter section will be decided soon.
T.Suzuki calculates the radiation level for 65m,90m and 115m cases.
65m is preferable from the viewpoint of the neutrino flux, but the radiation 
level is not acceptable. 

(3) Structure 
*Experimental hall meeting on Feb.13 (ICRR,INS,KEK)
 Diameter of the experimental hall is tentatively set to 24m. Each detector
 must be designed as compact as possible. The gap between the iron filters
 be reduced from 35cm to 31cm. The space for scifi/veto is 2.4m. The center
 of the hall is off from the beam line by 0.4m. 1kton tank has anti-counters
 inside. The floor of 1kton tank and FG detector is common. 
*Ishii summarizes the meeting with W.Kropp (Feb-14). Ishii explains the 
 structure of the front detector to him. He suggests that the muon group 
 should test the installation using the mockup. 
*S-B.Kim/Sakuda discussed the scifi structure. S-B.Kim will decide the shape of
 the aluminum tube soon. He will send us the schedule for the production of
 water tubes. He will talk with the engineer at BU and update the scifi 
 structure design. He also considers the veto structure design.  

(4) SCIFI
*scifi meeting with Kurary (Sakuda,Nishikawa)
 The first version of the spec document for purchasing fibers was examined.
 It will be finished within a week. 
*SuzukiAT reports from Kobe that a new fiber sample which is resistant against
 oxygen shows the longer lifetime by 50% than the previous one. We should 
 buy this type.

(5) Muon group (Ishii)
*Tension measurement of long chambers began last week. They finished 49 modules
 out of 400 modules and found 3 broken wires. 2 months ahead.
 Cosmic ray test for short chambers will begin soon. 

(6) LG (See Kobayashi's minutes of LG meeting,Feb-13)
Inagaki summarized the LG meeting on Feb.13. 
*Pulse height vs electron energy for 120ns and 1.5microsec gate.
*Energy resolution vs electron energy. DE/E = 10%/sqrt(E) is obtained.
*Pulse height vs incident position using cosmic rays. They point out that
 the light guide (7.5cmD, 6cmlong) generates additional 600 MeV eq Ce light.
Indeed, Maruyama confirmed that such Cherenkov light is produced in the 
 light guide using the GEANT simulation. 
 See also Kenmochi's memo on pnahp /home/kenmochi/lg/ngt_lg.ps.

(7) Online (Sakai) 
 He proposes to distribute the signal of the event number generator (8bit) 
 for the beam spill synchronization. He organizes the meeting this week.

(8) Beam Monte Carlo 
 S.Mine calculates the nu_e flux and spectrum by taking into account the 
 polarization effects of muons from pi/K decays. Nu_mu flux is unaffected.
 The nu_e flux is about 30% more than the previous calculation without 
 polarization effects. He is asked to generate the official nu_e spectrum
 for 10**20 POT.

(9) Offline
 Ishida distributes the Monte Carlo manual (E362-OFFL-002). He says that
 MC of the FG detector works well on CCPS work stations.

(10) Schedule 
 Nishikawa asks that each subgroup should present the schedule, milestone and
 manpower at the next E362 meeting. 
//(M.Sakuda)