Minutes of E362 FD weekly meeting
96/12/17, 19:00-20:30, KEK library meeting room,
Present:T.Ishii,T.Mine,A.Sakai,T.Kobayashi,T.Inagaki(INS), M.Kohama,
S.Echigo(Kobe),E.Jeong(Chonnam),M.Sakuda,Y.Ohyama,T.Ishida(KEK),
T.Maruyama(Tohoku),M.Nakamura(Niigata)
  
(1) Horn 
 Kohama reports that a pulsed current operation at 225kA (4msec) was 
 successful. The measured temperature rise is less than that calculated. 
The balance among four current lead lines was good within 5%. 
(On December 18, the nominal 250kA pulse was fed!)

(2) Muon (Ishii,Mine,Shiino,Jeong).
*Tension measurement: 80 modules (640 wires) out of 500 modules were
 checked. 
*The tension measurement for another 400 modules will be done next Feb/Mar.
 
(3) TOF (Ohyama)
Dismantling 64 TOF counters (4.2cmx13cmx400cm) from TOPAZ ended. 
He asked Suzuno Co to estimate the light pipes for them.

(4) LG 
Kobayashi reports;
*The trigger hodoscope for 3x3 blocks was delivered and is being tested
 by Inada/Kobayashi. 
*They need many plastic scintillators for the hodoscope for calibatating 600
 blocks. Tamura/Kobayashi consider using our ToF counters.
  
(5) SCIFI 
*Echigo/Etoh carried out the position calibration of IIT-CCD by illuminating
LED on fibers. One fiber (0.7mmD) is seen by about 5(H)x3(V) pixels. They
re-measured the position dependence of IIT. 
 Sakuda reports:
*Suzuno Co. measured the deformation of a 3m long aluminum tube with/without 
water. It was 0.7mm. In this measurement the both endplated were simply 
supported. In the real detector the both endplates will be fixed to the 
structure. According to the mechanical handbook, the deformation for both 
ends fixed is smaller by 5 than that for both ends simply supported. 
If we use 2mm or 1.8mm thick aluminum (2.4m long) and fix both ends, 
then the deflection is estimated to be about 0.2mm (<<1mm). (->Sakuda's memo)
*Kawai Optics Co finished coating the aluminum vapor (0.1micron) on raw fibers.
 They have established the procedure even for 1000km fibers.
*Kurary Co starts producing a new sample of SCSF78M which is more resistent to 
 oxygen. 
*Sakuda estimates the 1/e lifetime from Kurary's data.

(6) Structure meeting with Kawajyu Co. (Dec.16)
Ishii reports:
*The LG detector consisting of 2x5 segments will be assembled outside the hall
 and then it will be installed in the hall. The design is almost fixed.
*They showed three options for the structure of the muon detector. The first
 (original) one is the best design considering the cost and the simplicity.
 They think that the design is almost final. At the next meeting they will
 show the procedure of the installation of each component (Iron filters, 
 support beams, etc) and the cost estimation.
*Nakamura explains that the design of the experimental hall including the
 roof will be decided by the end of January. 
*Next meeting with Kawajyu Co. -> late January.

(7) Analysis
*Kobayashi estimates the event rate per spill where the neutrinos interact 
 with the soil and enter the 1kton detector: 0.7/spill in total 
 (0.3muon,0.09proton,0.12neutron etc). He points out that neutrons may become 
 the background for neutral current events. He also estiamtes the event rate 
 in water/SCIFI detector. eg, 0.025muon and 0.01neutron/spill.  
*Sakuda presented the status of E362 experiment at PS-PAC on Dec 12. 
 Questions at PAC;Why fiber detector instead of chambers?, probability of 
 2 events overlapping in 1kton detector?, Background of 30% in FGD is much? 
 Detailed schedule till the first beam? 
*Ishida distributes the minutes of the offline meeting via e-mail.
*Ohyama confirms that the SK Monte Carlo program works well on CCPS.
 
***DAQ meeting on December 20, 13:00- (TV conference, KEK-Kamioka) ****
//(M.Sakuda)