SksMinus status 04

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SksMinusstatus04

• HB meeting
• 2008/5/09
• ?????

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Contents

• Around target
• Helium target
• SDC2
• Geant4

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Around target
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Plan

• To design SDC12 frame
• SDC2 repair and PreAmp position arrangement
• SDC1 thickness 88 mm ? 70 mm
• SP0 diet 10 layers? 7 layers (20 mm ?)

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Helium target
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Helium target status

• Optimize
• Target length 335 mm (very tight length)
• Target shape Cylinder
• ? Elliptic cylinder, material selection
• Arm design HBJ frame
• Test
• Cooling test by refrigerator
• Existent vacuum chamber with the same arm length

Hyperball-J (Frame outer size)
Designed by Ishimoto-san
335 mm
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Points

• Target shape Not cylinder is preferred.
• Material Al or CFRP
• As small background as possible
• Thickness Enough thickness to pressure or thin
  surface with additional parts
• Arm design No interference to HBJ frame

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How to install

• Target is installed from the upstream of
  Hyperball-J.

Refrigerator etc.
SDC1
Beam
BAC
SAC
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Around target Ge detectors and frame
Interference to arm
218 mm
220 mm diameter cylinder can be installed.
Hyperball-J
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W/ Beam line elements (FF600mm)

• Enough space to install Helium target and other
  components

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SDC2
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Repair plan

• Readout connector check and repair
• Wire check To remove bad wire
• HV connector repair
• ?HV test ( LNS test with SP0)
• Wiring
• Rearrangement of connectors
• ?Cosmic ray test and LNS test with SP0

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SDC2 connectors
Gas connector
HV connector
To rearrange connectors more compact.
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Geant4
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Geant4 for new farm

• Geant4 environments are build in new farm.
  (farm1,2,3,4,5,6)
• Geant4.9.1 patch01
• CLHEP 2.0.3.1 (2.0.3.2 My PC)
• ROOT 5.18 (5.19 My PC)
• Calculation speed
• (K?m n events with EM and decay process, full
  material)
• Old farm 600 s
• New farm 400 s
• My PC 300 s
• (It depends on CPU clock ?)
• K?p p0 events 10000 events/600 s (SP0 with
  full condition)

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Comments

• New farm has good HDD (or memory) speed.
• Compile and read of the SKS magnetic felid map is
  very fast.
• Runge-Kutta method speed difference (SKS
  tracking)
• My PC 740 s
• New farm 300 s
• SKS analysis program may be faster ?
• Geant4 visualization is too slow ! (???)
• LAN speed ? PC performance ?

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Summary

• Priority
• Design around target
• Helium target
• SDC2
• Other simulation (SAC, SMF)
• Magnetic field map of SksMinus