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Hlab meeting

E05-115 experimental setup in JLab Hall C (2009). Hlab meeting. 14 Dec 2010 T.Gogami. Content. e - , e + background in HKS. Drift chambers in HKS. KDC wire configuration. v ’. 150°. K +. v. x ’. 90 °. x. u’. z. 30°. y. u. x. y. x. M ultiplicity. KDC wire configuration.

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Hlab meeting

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  1. E05-115 experimental setup in JLab Hall C (2009) Hlabmeeting 14 Dec 2010 T.Gogami

  2. Content • e- , e+ background in HKS

  3. Drift chambers in HKS KDC wire configuration v’ 150° K+ v x’ 90° x u’ z 30° y u x y x

  4. Multiplicity KDC wire configuration Multiplicity is higher for heavy target v’ CH2 , 2.0 [μA] K+ v 52Cr , 7.6 [μA] x’ x u’ z y u Multiplicity distribution x y x

  5. Number of tracks KDC1 Tracking efficiency is lower. Tracking eff. = 80% (Multiplicity = 5 ) TOP view TOP view Black : hit wires Blue : selected wires Red : track Black : hit wires Blue : selected wires Red : track CH2 52Cr

  6. Resolution Need to optimize parameters ・・・ CH2 , Ibeam = 2.0 [μA] 52Cr, Ibeam = 7.6 [μA] σ ≈ 170 [μm] σ ≈ 350 [μm]

  7. e, e+ background (Real data ) 76314 , CH2 Extension chamber vacuum chamber side KDC2 port , flange 2% KDC1 20% Port KDC2 KDC1 3000 events

  8. e , e+ background in GEANT simulation KDC1 KDC2 e- , e+ • Generated particle : e+ • Distribution : spherical uniform • Momentum : 860 – 1000 [MeV/c] • Angle : 0 – 2 [mrad] • 1000 events Vacuum chamber (sus304) NMR port (sus304)

  9. e , e+ background SIMULATION • Number (rate) • Angler distribution • Momentum dist. Target ELECTRON 2344 [MeV]

  10. Angular and momentum distribution of e+ HKS should not accept e+ directory. HKS detectors HKS D-magnet

  11. Dirty ranking (real data) b a B.G mix rate =

  12. Target thickness dependence(Simulation) H2O 52Cr 9Be 12C CH2 10B 7Li

  13. e , e+ background in GEANT simulation KDC2 KDC1 • Generated particle : e+ • Distribution : spherical uniform • Momentum : 860 – 1000 [MeV/c] • Angle : 0 – 2 [mrad] • 1000 events Vacuum chamber (sus304) NMR port (sus304) e+ make HKS dirty

  14. Outlook • Tracking for heavy target • Strict cut of TDC in the early stage of analysis. • Parameters for each target • Chambers • TOF counters • Algorithm • Drift distance (time) calculation • Track fit • Need to introduce new one? • ・・・・ KDC2 KDC1

  15. Summary • e- , e+ background make HKS dirty. • High rate • High multiplicity → Tracking が大変

  16. END

  17. E05-115 ( 2009 Aug – Nov ) Data summary Physics Data Λ Λ Λ Λ (@36μA) Λ Calibration Data 22nd Indian-summer school (SNP2010)

  18. KDC1 residual for 52Cr σ ≈ 350 [μm]

  19. Tracking for high multiplicity 52Cr target CH2 target particle KDC1 tracking particle Blue : selected wires Black: hit wires mean ~ 2 hit mean ~ 6 hit CH2 target 52Cr target Multiplicity of typical layer Traditional JLab Hall-C tracking code cannot handle with high multiplicity data. Tracking eff. CH2 52Cr Developing new code Multiplicity Strangeness 2010 at KEK

  20. HKS detectors June 2009 in JLab Hall-C 1 [m] • HKS trigger • CP = 1X ×1Y × 2X • K = WC ×AC •  CP × K − π+ K+ p ~18 [kHz] (8 [μA] on 52Cr) K+ p, π+ Drift chambers -KDC1,KDC2- • Cherenkov detectors -AC,WC- • Aerogel (n=1.05) • Water (n=1.33) TOF walls -2X,1Y,1X- (Plastic scintillators) σ ≈ 250 [μm] TOF σ ≈ 170 [ps] Strangeness 2010 at KEK

  21. HES Detectors HES D magnet Drift chambers - EDC1 , EDC2 - TOF walls - EH1 , EH2 - (Plastic scintillators) σ ~ 300 [ps] Time Of Flight HES trigger EH1 ×EH2 ~2 [MHz] (8 [μA] on 52Cr) e Strangeness 2010 at KEK

  22. E05-115 ( 2009 Aug – Nov ) Data summary Physics Data Λ Λ Λ Λ (@36μA) Λ Calibration Data 22nd Indian-summer school (SNP2010)

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