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HES-HKS & KaoS meeting

HES-HKS & KaoS meeting. Toshiyuki Gogami 8/Nov/2012 From Mainz. 5/Nov/2012 @ A1 Exp. Hall. Contents. Energy loss study K + : HKS Geant4 e’ : HES Geant4 e : Modified POSI Geant4 . Energy Loss. Prediction ; Landau distribution with uniformly floating peak value. Log scale.

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HES-HKS & KaoS meeting

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  1. HES-HKS & KaoS meeting Toshiyuki Gogami 8/Nov/2012 From Mainz 5/Nov/2012 @ A1 Exp. Hall

  2. Contents • Energy loss study • K+ : HKS Geant4 • e’ : HES Geant4 • e : Modified POSI Geant4

  3. Energy Loss Prediction ; Landau distribution with uniformly floating peak value Log scale ただの予想(シミュレーションではない) Like these ??

  4. Energy loss simulation by HES,HKS and POSI • POSI for beam energy loss • Harver foil is already implemented in this code. • Implemented Raster newly. • HKS, HES for K+ and e’ energy loss • Transplant harver foil into these code from POSI. • バグだし • (HES、HKS)変数の定義の間違え・・・昔からあるようだが。。 • (POSI)Rasterを入れる際のバグ….etc • New ver. GEANT では動かない問題(HES,HKS) • コンストラクターの引数の数、順番 • G4ThreeVector…..etc • 日本で解決済

  5. Beam Energy Loss study Used Geant4 simulation code“Modified POSI” Water ( + harver ) target in the display Target Generation point (Uniform in z-direction) Virtual Detector SIMULATION

  6. Energy loss distribution of the simulation Boron , 56.1 mg/cm2 Fitted by landau function just for edge and tail portion

  7. Determination of the value of energy loss Boron , 56.1 mg/cm2 EDGE This edge is the peak value which is derived by the fitting results 31keV

  8. Water target with Harver foils Water Harver foil effect Foil EDGE water 371keV

  9. Simulation Results Unit : keV Filling Blanks now

  10. Wiki • 資料アップお願いします http://lambda.phys.tohoku.ac.jp/~db/mediawiki/index.php/%E7%99%BA%E8%A1%A8%E8%B3%87%E6%96%99 • Mainz　メンバー更新しました http://lambda.phys.tohoku.ac.jp/~db/mediawiki/index.php/Mainz_Members

  11. Outlook • Λ cross section • Polyethylene • Divide by several bins ( <=4 ) • Check acceptance estimation • Water • Estimate efficiencies  Discuss with Patrick (Before leave Mainz) • Matrix tuning • Fixed small Bugs • See how will it work with new energy loss estimations • Want to try to use better S/N events (tight cut) • Want to put Λ,Σ0 events from water target to good use.

  12. END

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