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Advanced Designs and Repairs for Helium and SDC Targets in Geant4 Simulation Environment

This documentation outlines plans to optimize the Helium target and SDC2, including repair and design considerations, in the Geant4 simulation environment. It covers target length, shape, material selection, and arm design for the Hyperball-J frame, as well as repair plans for SDC2 connectors and rearrangement in a compact manner. The text also discusses Geant4 implementation in new farms, with a comparison of calculation speeds between old and new systems, highlighting performance improvements. Overall, the priority areas include target design, SDC2 enhancements, and other simulations.

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Advanced Designs and Repairs for Helium and SDC Targets in Geant4 Simulation Environment

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  1. SksMinusstatus04 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 • 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 Refrigerator etc. Target is installed from the upstream of Hyperball-J. 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 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 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)

  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

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