HES HKS meeting

HES HKS meeting21/Apr/2011

T.Gogami

Contents

• Stricter TDC cut of KTOF– Improvement• Analysis time• Number of Kaon

– Check for all targets

DC hit info. selection with TOF

Selective region Maximum gradient

Minimum gradient

Particle direction

Gravity

CUT~8%

~17%

Procedure in “h_dc_tofcut.f”1. Get KTOF1X & 2X hit counter information2. Make combination of 1X and 2X hit counter if those two are in

same group (grouping) 3. Determine cut conditions on KDC1 & KDC24. Select Hit wires in KDC and Reorder them

CUT

Check works of the code

• GREEN region Selective region• RED markers & lines Selected hit wires• BLACK markers & lines Rejected hit wires

v v’ u u’

x x’

v v’ u u’

x x’

KDC1 KDC2particle particle

KTOF TDC

• Cut10000 – 50000 (Current)18000 – 20500 (New)

Run 76314 for CH2 targetRun 77124 for 52Cr target

Multiplicity improvement history

Multiplicities just before tracking stage

DC hit selection wit TOFs Stricter TDC cut of TOFsOriginal

Multiplicity improvement history

Multiplicity went down !• Analysis time

– 20% reduction for 52Cr• Number of Kaon (RUN:77124, 52Cr)

– 56 70 90 130

Applied TDC cut

DC TOF cut Matrix DC TOF cut ‘ (TDC cut)

Checked KTOF TDC of all targets

• Modified parameter files– e05115replay/PARAM/• hhodo.param.75884• hhodo.param.75886• hhodo.param.75921• hhodo.param.76092• hhodo.param.76118• hhodo.param.76376• hhodo.param.76646

Correct coincidence window

Summary and to do• Summary

– Stricter TDC cut of KTOFs• Stricter KDC hit wires selection

– Analysis time : 20% reduction for 52Cr– Number of Kaon : 2 times more compared to rev.456

• Checked for all targets

• To do– Λ’s Cross section check for CH2 and H2O targets

If consistent result shows upMatrix

– E05-115– E01-011

– Tracking– Parameter optimization

• Residual– Documents

• RA• 授業料免除• 学振

– Germany• Departure date : 6/May/2011

End

17/Apr/2011