HES-HKS & KaoS meeting15/July/2011

T.Gogami

Wiesbadenのお風呂はこんな感じでした

Content

• E05-115– KDC x-t parameter correction (H2O , 52Cr)

E05-115

EHODO cabling ( 30/July/2009 )

Cherenkov .N.Taniya

S.N.Nakamura

Residuals & x-t correlation

X-t function is worse ?

CH2 target 52Cr target

abs(WC –TC) vs. Drift time

|Wire center – Track coordinate|

s0

Wire center

Track coordinate

Black : |WC-TC|Magenta : Profile of |WC-TC|Green : x-t calc.

CH2 target 52Cr targetDr

ift d

istan

ce

Drift

dist

ance

abs(WC –TC) vs. Drift time ( with Tracking chi-square cut )

1. trkchi2 < 100

2. trkchi2 < 50

3. trkchi2 < 10

“Drift time” to “Drift distance” (HKS) PARAM / hdriftmap.param.0

number of array

+50

h_drift_dist_calc.f

ilo

ihi

gradient

fractional partInterpolate

drift time

KDC x-t function correction

• (Tohoku PC in Mainz) – /home/gogami/E05-115/root/hksSingle/xt_calib/

• Makefile• xtCalib.cc• input/param.in• outdat/*.dat

ParametersFunctionFittingProfiling5th order polynomial

Drift Time & Drift Distance

52Cr target (77120 – 77124)

Before After

Drift Time & Drift Distance( DD>0.0 && DD<0.5 )

52Cr target (77120 – 77124)

Before After

Drift Time & Drift Distance & residual

Run52Cr 77120 - 77124Cut0.0 [cm] < Drift distance < 0.5 [cm]

Before After

Tracking residuals (KDC1-x)

• Number of event up!• Residual better!

Before Before

After After

H2O target 52Cr target

Tracking chi-square

Tracking quality up!

H2O target 52Cr target

[1]. Total (after,before) = (94444,93226) 1.3% up[2]. Num( <10 ) (after,before) = (47151,43463) 8.5% up

[1]. Total (after,before) = (45870,44864) 2.2% up [2]. Num( <10 ) (after,before) = (15279,13417) 13.9% up

Ratio of the number of eventwith same chi-square cut

Rough K+ selection– haernpe1+haernpe2+haernpe3<5.0 – hmsq<0.60 – hwatnkn1+hwatnkn2>1.0

H2O target 52Cr target

[%]

[%] 𝑅𝑎𝑡𝑖𝑜=

𝐴𝑓𝑡𝑒𝑟𝐵𝑒𝑓𝑜𝑟𝑒

𝑅𝑎𝑡𝑖𝑜=𝐴𝑓𝑡𝑒𝑟𝐵𝑒𝑓𝑜𝑟𝑒

KaoS experiment

Aerogel Cherenkov Detector (13/July/2011)

Preparation for beam time• Target (7Li,9Be) [Anselm]• Aerogel [Luka, Tohoku]• TOF [Florian]

Cutting Aerogel

Cosmic-ray Test

New spacer

Summary and To do• Summary

– E05-115• x-t function correction for 52Cr & H2O target (No iteration) Got better

• To Do– E05-115

• x-t function correction iteration for 52Cr & H2O target • Tracking (HES, HKS)

– DC info selection with TOF, AC (WC)• Efficiency

– EHODO– Low momentum side of HKS

– E01-011• Y-offset of RP pattern with SS hole cut

– Decay pion experiment• 7/19-

– APFP2011• Conference Fee (Early :300USD, On-site:400USD) - 7/20

– Stay permission in Germany• Interview on 7/26 10:00-

End

Wiesbaden, Germany (9/July/2011)

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ハーゲンダッツ

Number Comparison (no cut)H2O target 52Cr target

Number Comparison (Kaon Select)

H2O target 52Cr target