1. SksMinus status 04
HB meeting
2008/5/09
白鳥昂太郎

2. Contents
Around target
Helium target
SDC2
Geant4

3. Around target

4. Plan To design SDC1&2 frame
SDC2 repair and PreAmp position arrangement
SDC1 thickness : 88 mm → ~70 mm
SP0 diet : 10 layers→ 7 layers (~20 mm 痩)

5. Helium target

6. Helium target status Optimize Test
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

7. 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

8. How to install Target is installed from the upstream of Hyperball-J.
Refrigerator etc.
SDC1
Beam
BAC
SAC

9. Around target : Ge detectors and frame
Interference to arm
~218 mm
220 mm diameter cylinder can be installed.
Hyperball-J

10. W/ Beam line elements (FF+600mm)
Enough space to install Helium target and other components

11. SDC2

12. 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

13. SDC2 connectors To rearrange connectors more compact. Gas connector
HV connector
To rearrange connectors more compact.

14. Geant4

15. Geant4 for new farm
Geant4 environments are build in new farm. (farm1,2,3,4,5,6)
Geant4.9.1 patch01
CLHEP ( 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 : events/~600 s (SP0 with full condition)

16. 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 ! (｀Д´大谷)
LAN speed ? PC performance ?

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