Minutes of E362 FD weekly meeting
97/06/13, 15:00-17:30, Library meeting room
Present:K.Nishikawa(Chairman),T.Ishii,Y.Ohyama,T.Ishida,T.Kobayashi,S.Mine,
T.Inagaki,A.Sakai,M.Sakuda(KEK),T.Maruyama(Tohoku),T.Kadowaki(SUT),
M.Kohama(Kobe),E.Jeong,H.Lee(Chonnam),J.Hill,E.Sharkey,B.Williams,
R.Reese(SUNY),M.Nakamura(Niigata)

(1) Experimental Hall (Nishikawa)
He summarized the expected power consumption in the experimental hall. 
He asked each detector group to check the cable length from the detector
to the electronics hut. 
 
(2) Muon (Ishii)
*Ishii/Jeong/Li/Shiino/Tauchi finished 17 sets out of total 58 sets.
*They repair 7 broken wires.
*Ishii checked the latest draft of the experimental hall and found only 28-35
cm space between the wall and the muon detector. He wants at least 20 cm more
space. 

(3) LG 
*Reese confirmed that the nominal magnetic field value gives the lower beam 
energy. After correcting for the magnetic field value, she still observes
 the non-linearity (10-20%) below 100MeV. 
*She will estimate the leak of the energy from one LG block. Using the Monte 
Carlo, Maruyama previously reported that 7 MeV energy escapes from one block 
when the incident energy is 50 MeV. 

(4) Beam 
*Kobayashi calculated the muons produced from neutrino interactions upstream
of the front detector when the detector is located at 280m, 300m and 320m.
                       280m     300m    320m
1kton               0.318      0.304    0.302  muons/spill
Fine grain          0.0306     0.028    0.023  muons/spill
There is little difference. Also little difference for neutrons.
*Williams reports from the 3rd prototype mu-monitor test.
 1. Accurate comparison between the profile monitor and the prototype.
 They believe that the accuracy of the prototype is better than +-1mm.
 2. Characterize the effect of beam movement on the total charge. 
 Both detectors give less than 3% (pulse-by-pulse) variations in the total 
 charge (=intensity) at one position. At different positions, the prototype 
 gives 6.3% variations in the total charge.  
*Inagaki studies the saturation of the total charge as HV increases.
 He showed the clean correlation between the beam position of the profile
monitor and that of the prototype. 
 He also respoted the measurement of the refractive index with HFC23 and 
 HCFC22. To obtain n=1.0027, he need 6.3atm and 3.7atm for each gas. Too high.
 He wants to test RC318 next month.

(5) SCIFI 
*Kobe group(A.Suzuki) reports that a new sample gives 10-20% less light yield
than the previous one. The attenuation length is longer (360cm->410cm).
 Tashiro is testing the fiber spooling machine.
*BU (SBK) reports that they will build a single layer of water containers/end
 plates within a month. 
*Sakuda shows the first draft of the SCIFI detector which uses a 2.6mx2.6mx
 16mm honeycomb panel (Fujino/Sakuda). 
*S.Mine studies the detection efficiency of the doublet fiber ribbon using 
 the cluster program. He defines a "hit" of a fiber when the fiber contains
 more than 10 pixels on CCD image. He obtain 96% efficiency, but finds 4% 
 fake hits on the neighboring doublet. 
 The polishing of the fiber ribbon for the cosmic-ray test will be done 
 next week. 
*The problem reported by Sharkey turns out to be the multiple triggers during
 the data-decoding. This should be solved by using a proper busy signal from
 FADC. Sharkey also works on the soldering of the EL module.

(6) Offline 
*Ishida/Nakamura are finishing off the draft of the electron identification.
 Ishida wants to use SK-NEUT library, being used by SK, for 1kton detector 
 analysis. Itow will help. 
*He explains the data flow of the scifi analysis. Mine,Sharkey and Ishida 
 will work on the software delvelopment of the scifi analysis.
*Kobayashi tries to incorporate the effect of light guide in the simulation. 

(7) Horn
At the horn meeting he was told to remove the artificial steel (5cm thick) 
around the aluminum target in his simulation. After this correction to his
simulation program, he obtains 5% more flux than the previous (wrong) value.

*July 8, 18:00, Party to celebrate the unification of KEK/INS. 
(M.Sakuda)