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

Preparation status for the
experiment at J-PARC (P-15)
Hiroaki Ohnishi
RIKEN
Overview of the detector
1m
Magnet
CDH
Aerogel
Cherenkov
CDC
Beam
Target chamber
T0
CDC
Kaon Decay Veto
Bea
m
Veto
CDH
Beam Position Chamber
• Three major components.
– Solenoid magnet
– Cylindrical Detector Hodoscope (CDH)
– Scintillation counter
– Cylindrical Drift Chamber (CDC)
JFY06 budget
JFY06+07 budget
JFY07 budget
1m
Beam Line
tracker
Solenoid magnet
• 1st meeting together with NEC-TOKIN engineer has been done on
26/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),
Φ=1.2m, length=1.2m
– 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 Φ=0.35m (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 be
within 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)
RIKEN-CDS magnet
（Solenoid 電磁石）磁極内部仕様
正面
1.0 m
磁極口径
1.2 m
磁極長
1.2 m
磁場強度
0.7 T
電磁石鉄蓋に穴を開ける 0.30m 直径
磁場一様性に関する要求 (最低条件)
下図斜線部内
について１％未満である
側面
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
0.1 m
0.1 m
0.3 m
Design done by NEC-TOKIN
350kW
20t ~ ￥37M
Schedule
• Submission of manuscript for public announcement for bid
（入稿原稿投稿）
• public announcement for bid
• Closing date for bid (入札締切り)
• Judging committee meeting for
technical feasibility evaluation for biding companies
• bid opening
• Purchase order will be issued
• Delivery of the solenoid
• checking of incoming goods (検収)
1st/Sep
20th/Sep
10th/Nov
17th/Nov
20th/Nov
21st/Nov
28th/Feb/07
28th/Feb/07
Key point
Specification of the solenoid must be fixed by mid Aug. i.e. in a week
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 field
Fine mesh phototube will be our choice.
• Hamamatsu H8409-70(R7761) will be our 1st choice.
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–
–
–
–
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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 (随意契約) 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

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