HES-HKS & KaoS meeting
description
Transcript of HES-HKS & KaoS meeting
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HES-HKS & KaoS meeting
Toshi Gogami27/June/2012
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Contents• SPL Magnetic field change by the effect of ENGE iron• SPL + ENGE GEANT4• The Helmholtz coil for bucking coil test
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By on the line(Around SPL)
Line coordinates X [cm] Y [cm] Z[cm]
Minimum -40.0 0.0 15.0
Maximum 40.0 0.0 65.0
Saw By on the line
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Setup
Setup1. SPL + ENGE(OFF)2. SPL + ENGE(ON)3. Only SPL4. SPL(8% up) + ENGE(OFF)
SPL + ENGE model
SPL model
ON : current onOFF : current offSPL is ON all the time
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Setup
Setup1. SPL + ENGE(OFF)2. SPL + ENGE(ON)3. Only SPL4. SPL(8% up) + ENGE(OFF)
SPL + ENGE model
SPL model
ON : current onOFF : current offSPL is ON all the time
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%
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Results
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Comparison 1 (Set1 and Set2)
• ~ 10 G reduction in SPL• The effect is larger as closer to ENGE
Small effect
Closer to ENGE
SPL
Subtraction
SPL
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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
Closer to ENGE
SPL
Subtraction
100.0 + (Set1 – Set3) / Set3 * 100.0
Ratio
SPL
Due to meshing80 ~ 95%
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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.
Closer to ENGESPL
Subtraction
100.0 + (Set1 – Set3,4) / Set3,4 * 100.0
Ratio
SPL
Set1 – Set4
Set1 – Set3
Set1 – Set4
Set1 – Set3
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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 ??
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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 uniformNumber of events : 300pe : 0.27 ± 0.1 GeV/cθ : 0.1 ± 0.05 radφ : 1.57 ± 1.5 rad
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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 VD5At VD0 SPL
ENGE
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Sieve slit pattern (2)
Will be compared to real data !!!
x’ vs. y’ at the target x vs. x’ at the reference plane
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Helmholtz coil for the bucking coil test
• Central magnetic field• Uniformity
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By and uniformity from Chiba’s master thesis
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TOSCA calculation of current vs. By
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TOSCA calculation of current vs. By
Consistent with Chiba measurement
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TOSCA calculation of uniformity
Consistent with Chiba measurement
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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,Σ0 and 12ΛB g.s.
• Efficiencies (Trigger, Tracking, DAQ, K+ selection, Burned effects, absorption, decay….)
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END
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TOSCA calculation of current vs. By
Consistent with Chiba measurement