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HES-HKS & KaoS meeting

HES-HKS & KaoS meeting. Toshi Gogami 27/June/2012. Contents. SPL Magnetic field change by the effect of ENGE iron SPL + ENGE GEANT4 The Helmholtz coil for bucking coil test. B y on the line (Around SPL). Saw B y on the line. Setup. Setup SPL + ENGE(OFF) SPL + ENGE(ON) Only SPL

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HES-HKS & KaoS meeting

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  1. HES-HKS & KaoS meeting Toshi Gogami 27/June/2012

  2. Contents • SPL Magnetic field change by the effect of ENGE iron • SPL + ENGE GEANT4 • The Helmholtz coil for bucking coil test

  3. By on the line(Around SPL) Saw By on the line

  4. Setup Setup • SPL + ENGE(OFF) • SPL + ENGE(ON) • Only SPL • SPL(8% up) + ENGE(OFF) SPL + ENGE model ON : current on OFF : current off SPL is ON all the time SPL model

  5. Setup Setup • SPL + ENGE(OFF) • SPL + ENGE(ON) • Only SPL • SPL(8% up) + ENGE(OFF) SPL + ENGE model ON : current on OFF : current off SPL is ON all the time SPL model • Comparison • Set1 & Set2  Effect of leaked field from ENGE • Set1 & Set3  Effect of ENGE iron • Set1 & Set3 & Set4  How much we can recover the effect from the ENGE iron after increased current on SPL by 8%

  6. Results

  7. Comparison 1 (Set1 and Set2) • ~ 10 G reduction in SPL • The effect is larger as closer to ENGE  Small effect Subtraction SPL SPL Closer to ENGE

  8. Comparison 2 (Set1 and Set3) • Up to ~ 0.3 T difference • Became 80 ~ 95% in SPL  Need to increase current for SPL to send beam to the beam dump Subtraction SPL 80 ~ 95% Ratio Due to meshing SPL 100.0 + (Set1 – Set3) / Set3 * 100.0 Closer to ENGE

  9. Comparison 3 (Set1, Set3 and Set4) • Recovered by <~5 % in SPL  But hard to say it is good enough to send beam to the beam dump. Subtraction SPL Set1 – Set4 Set1 – Set4 Set1 – Set3 Ratio Set1 – Set3 SPL 100.0 + (Set1 – Set3,4) / Set3,4 * 100.0 Closer to ENGE

  10. Summary of SPL+ENGE TOSCA calculation • SPL field • Leakage field effect is ~10 G level in SPL. • Effect from ENGE iron • SPL field is no more uniform. • Very large ( up to ~0.3T difference from only SPL model) • It is hard to find optimal current of SPL for sending beam to beam dump only by seeing By in SPL. • Need to see beam tracks in TOSCA and/or GEAMT4  What about the field clamp effect ??

  11. SPL + ENGE GEANT4 Major update • Added • Field map (SPL+ENGE combined , SPL 8% up) • Virtual detectors • VD3 : before EDC • VD4 : after EDC • VD5 : after SS (1cm away from SS back face) • Modified • Trigger • Sieve slit • Output tree Distribution : spherical uniform Number of events : 300 pe : 0.27 ± 0.1 GeV/c θ : 0.1 ± 0.05 rad φ : 1.57 ± 1.5 rad

  12. Sieve slit pattern (1) • Distribution : spherical uniform • Number of events : 154k • Sieve Slit : ON • pe : 0.29 ± 0.1 GeV/c • θ : 0.1 ± 0.05 rad • φ : 1.5703 ± 1.5703 rad VD0 VD5 At VD0 SPL ENGE

  13. Sieve slit pattern (2) Will be compared to real data !!! x vs. x’ at the reference plane x’ vs. y’ at the target

  14. Helmholtz coil for the bucking coil test • Central magnetic field • Uniformity

  15. By and uniformity from Chiba’s master thesis

  16. TOSCA calculation of current vs. By

  17. TOSCA calculation of current vs. By Consistent with Chiba measurement

  18. TOSCA calculation of uniformity Consistent with Chiba measurement

  19. Summary and To do • Summary • TOSCA calculation • 8% up for SPL • GEANT4 • SS pattern can be seen. • To do • TOSCA calculation • Field clamp • Beam to beam dump • GEANT 4 code of SPL + ENGE • Compare to real data • Matrix tuning (Beginning of June - ) • mtune • Cross sections of Λ,Σ0and12ΛB g.s. • Efficiencies (Trigger, Tracking, DAQ, K+ selection, Burned effects, absorption, decay….)

  20. END

  21. TOSCA calculation of current vs. By Consistent with Chiba measurement

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