Preparation status for the experiment at J-PARC (P-15)

1
Preparation status for the experiment at J-PARC
(P-15)

• Hiroaki Ohnishi
• RIKEN

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Overview of the detector

• Three major components.
• Solenoid magnet
• Cylindrical Detector Hodoscope (CDH)
  Scintillation counter
• Cylindrical Drift Chamber (CDC)

JFY06 budget
JFY0607 budget
JFY07 budget
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Solenoid magnet

• 1st meeting together with NEC-TOKIN engineer has
  been done on26/July/2006.
• Basic lists of specification for the solenoid
  magnet we are agreed on the meeting
• construct normal magnet, not super conducting
  magnet.
• Size of the magnet inside (volume for detector),
  F1.2m, length1.2m
• Maximum field strength can be achieved 0.7 T
• Solenoid magnet will be covered with ion case, to
  keep uniformity of the magnetic field inside, but
  must have F0.35m (diameter) hole on the end cap
  plates to keeping space for the cables of CDC/CDH
  getting out from solenoid
• Keep deviation of the field strength around
  tracker volume must bewithin 1
• End cap ion plates must be dismountable easily to
  keep accessibility to the detector inside for
  maintenance purpose
• 2nd meeting scheduled on 8/Aug/2006 (tomorrow)

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???? 1.2 m ??? 1.2 m ???? 0.7
T ??????????? 0.30m ??
RIKEN-CDS magnet (Solenoid ???)??????
??????????? (????) ?? ???? ????1?????
??
??
1.0 m
0.1 m
0.3 m
0.1 m
0.1 m
0.3 m
0.3 m
0.15 m
0.3 m
0.3 m
0.2 m
0.3 m
0.1 m
1.2 m
1.2 m
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Design done by NEC-TOKIN
350kW
20t ?37M
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Schedule

• Submission of manuscript for public announcement
  for bid (??????)
  1st/Sep
• public announcement for bid 20th/Sep
• Closing date for bid (?????) 10th/Nov
• Judging committee meeting for technical
  feasibility evaluation for biding
  companies 17th/Nov
• bid opening 20th/Nov
• Purchase order will be issued 21st/Nov
• Delivery of the solenoid 28th/Feb/07
• checking of incoming goods (??) 28th/Feb/07
  

Key point Specification of the solenoid must be
fixed by mid Aug. i.e. in a week
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PMTs

• PMTs for CDH also will be purchased using JFY06
  budget
• CDH will be installed inside solenoid, so that
  PMTs must have high resistively against high
  magnetic fieldFine mesh phototube will be our
  choice.
• Hamamatsu H8409-70(R7761) will be our 1st choice.
• Gain 4x106 at 0T, 1x106 at 0.5T
• Size 1.5 inch, 10cm long with HV divider chain
• Pulse linearity within 2 deviation up to 350 mA
• Transition time spread (TTS) 350 ps (FWHM)
• \260k / tube
• We will purchase 50 tubes \10M
• Even, H8409-70 will be only available product in
  the world,contract at direct (????) with
  Hamamatsu will not be accepted by RIKEN office
• Preparation for the biding process have been
  started. ( contract with \10M is rather easy.
  It will takes a couple of weeks.)
• Contract will be made on beginning of September
• PMTs will be delivered to us by end of Feb/2007