Minutes of E362 meeting

Nov-12-96 19:00 - 21:30

K.Nakamura, K.Nishikawa, T.Maruyama, T.Inagaki,
T.Nakamura, M.Kohama, M.Etoh, T.Ishii, S.Mine,
T.Kobayashi, A.Sakai, T.Ishida, T.Chikamatsu,
E.Jeong, Y.Oyama

1)General
  K.Nishikawa reported on summary of discussion with
  U.S. collaborators during their visit on Kamioka.
  U.S. collaborators proposed to work on following
  part of the front detector.

    i)water container/structure
       -->Boston University 
   ii)1kt water system
       -->UCI, Los Alamos
  iii)anticounter of 1kt detector
       -->Stony Brook
   iv)GPS,DAQ
       -->Univ. of Washington, Hawaii

  From April 1997, at least one senior member and
  post Doctors + Graduate students will visit on
  KEK.

  K.Nishikawa also presented that we must form sub-groups
  in order to allocate many works efficiently. Possible
  sub-groups he proposed are SCIFI, PbG, muon chamber,
  1kt, beam monitor, DAQ, veto/trigger, MC, offline.
  We will assign members of each sub-group in the near
  future.

2)Horn
  M.Kohama reported on recent status of horn current test.
  A test with DC current is in progress and everything seems
  to be successful. This DC current test will be finished
  within this week and he will study a pulse current test
  during last week of November.

3)calibration of Lead Glass counters
  T.Maruyama reported on preparation for calibration of
  Lead Glass counters. The calibration system consists of
  Xe lamp, diffuser and optical fibers. He already ordered
  Xe lamp and is now selecting the best optical fibers for
  this purpose. He will purchase all stuff needed for the
  calibration using budget of this fiscal year.

4)electron identification
  T.Ishida reported on the electron identification capability
  using the SCIFI tracker and the lead glass counters. He
  modified the dimension of the SCIFI detector according to
  the conclusion presented by T.Chikamatsu. He also employed
  1 track events which were not used in the old analysis by
  T.Nakamura. He concluded that he can identify 150 electron
  neutrino events  for 10^20 p.o.t. whereas number of expected
  background from muon neutrinos are calculated to be 50.
  This identification capability is considered to be enough
  for the nue <-> num oscillation search by examining 
  appearance of electron neutrinos in the SK site.   

5)muon chamber
  T.Ishii reported the status of the test of the muon chamber.
  They finished the gas leak test for the forward and backward
  chambers. The test for the barrel chambers are in progress.
  He was requested to finalize the schedule for the wire tension
  measurement and the cosmic ray muon test in order to arrange
  man power for the jobs.

6)Gas circular system
  T.Chikamatsu reported on the gas system for the muon chamber.
  In order to keep safety of the experimental area, we must
  communicate with PS safety committee (head : Prof.Imazato).
  Chikamatsu is now estimating possible gas circulation system
  with company people. He also pointed out that nitrogen gas
  system for SCIFI detector will be more difficult than the
  preliminary design by Kobe people. 

7)LAN
  A.Sakai reported on a construction of local area network along
  the beamline. According to his plan, the FD site, the beam
  dump, the target station, two machine rooms, the beam control
  room and the north counter hall are connected by an Ethernet
  cable. He is requested to present the outline of the data flow
  from the FD experimental site to offline analysis computers. 
     
8)scintillation fiber
  M.Etoh is now studying how to connect the scintillation fibers
  and IITs. K.Nakamura suggested that the SCIFI detector is the
  most difficult component in the Front detector and tests for
  the SCIFI must be done as early as possible. He also suggested
  cosmic ray muon test for the scintillation fiber should be
  done in order to confirm the tracking efficiency estimated by
  a theoretical calculation.


					Y.Oyama