HES HKS meeting24 Dec 2010

T.Gogami

E05-115 experimental setup in JLab Hall C (2009)

Contents• Current status– multiplicity– Residual

• Residual– Weird distribution especially for 52Cr , H2O target

Curry buffet in AOSIS (16Dec2010)

Multiplicity for each target

Cannot extract tracks from higher multiplicity event.

52Cr 12C 10B

7Li

9Be

H2O CH2

NtuplePattern recognition

Multiplicity for each layerTarget Run Number Beam [μA] Multi

KDC1-x (@PR)

Multi KDC1-x(@N)Thickness [mg/cm2]

CH2 450.0 76314 2.0 2.92 2.72

H2O 500.0 75972 2.7 5.75 4.937Li 184.0 76220 32.0 4.26 3.85

9Be 188.1 76607 38.4 4.73 4.1610B 56.1 76184 42.4 2.52 2.4612C 112.5 76077 38.8 4.42 4.12

52Cr 154.0 77124 7.6 6.42 5.14

Residual for each target52Cr ,77124σ≈372 [μm]

12C ,76077σ≈218 [μm]

10B ,76184σ≈161 [μm]

9Be ,76607σ≈214 [μm]

7Li ,76220σ≈181 [μm]

H2O ,75972σ≈337 [μm]

CH2 ,76314σ≈155 [μm]

Rate dependence

• Multiplicity : linear dependence with rate• Residual : quadratic dependence with rate

Kawama-san’s study

Residual vs. track chi2 for 52Cr

Residual of 52Cr target

1

12

Typical event with event display

Residual vs. Drift distance

cleanup.f reject bad events

Summary and to do• Summary

– Multiplicity• Linear dependence with rate in KDC

– Residual• Quadratic dependence with rate in KDC• Weird distribution especially for 52Cr , H2O target

• To do– Tracking

• 4 by 4• Doi simulation• Residual

– Track fit– Left right– Drift time calculation

– E01-011 – 出張手続き

• 飛行機• 宿• ViSA

End

焼きチーズカルボナーラ@ ハミングバード in LaLa garden

23 Dec 2010

x , x’ wires