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HLab meeting Status report. T.Gogami 13/Sep/2011. 12 /Mar/2011 CNN News in D.C . Contents. CH 2 & H 2 O Λ issue ¼ σ Λ (CH 2 ) = σ Λ (H 2 O) Develop Tracking code. Experimental setup of JLab E05-115. p( e,e’K + )Λ,(Σ 0 ). Experimental setup of JLab E05-115. p( e,e’K + )Λ,(Σ 0 ).

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hlab meeting status report

HLab meetingStatus report

T.Gogami

13/Sep/2011

12/Mar/2011

CNN News in D.C.

contents
Contents
  • CH2 & H2O Λ issue
    • ¼ σΛ(CH2) = σΛ(H2O)
    • Develop Tracking code
experimental setup of jlab e05 1151
Experimental setup of JLab E05-115

p(e,e’K+)Λ,(Σ0)

HES

e’

Splitter Magnet

HKS

K+

a nalysis process
Analysis process

HES

HKS

tracking

tracking

JLab E05-115

p(e,e’K+)Λ,Σ0

x , x’ , y , y’

at Reference plane

x , x’ , y , y’

at Reference plane

~40 hours

(5 shifts)

Very preliminary

F2T function

F2T function

x’ , y’ , p

at Target

x’ , y’ , p

at Target

particle ID

(select K+)

Missing Mass

tune

tune

p : Λ , Σ0 ,12ΛB

Angle : Sieve slit

multiplicity of typical layer of chamber
Multiplicity of typical layer of chamber

HES

HKS

~1.13

~2.24

~4.94

~1.28

Multiplicity is high for HKS

hit wires in kdc1
Hit wires in KDC1

KDC1

Overhead view

Overhead view

Misidentification chance in hit wires selection increase !

low

high

low

high

REAL DATA

REAL DATA

Black : hit wires

Blue : selected wires

Red : track

Black : hit wires

Blue : selected wires

Red : track

CH2

52Cr

basic tracking procedure
Basic tracking procedure

Real data

52Cr target

CH2 target

Good TDC

High multiplicity

Pattern recognition

Black : hit wires

Blue : selected wires

Red : track

KDC1

Solve left right

Select good combination

Combination selection with TOF counters

Reduce hit wire combinations (h_tof_pre.f)

Track fit

new tracking scheme
New tracking scheme
  • Hit wire selection with TOF
    • 1X & 2X
    • Grouping
  • Pre-PID
    • Cherenkov detectors

Good TDC

みそ

High multiplicity

Pattern recognition

Reduce hit wires to analyze

Solve left right

Select good combination

Combination selection with TOF counters

Reduce hit wire combinations (h_tof_pre.f)

Track fit

dc hit info selection with tof xx
DC hit info. selection with TOF (xx’)

Just applied to xx’-layers for test

Gravity

CUT

Particle direction

~17%

Selective region

Maximum gradient

~8%

CUT

Minimum gradient

Procedure in “h_dc_tofcut.f”

Get KTOF1X & 2X hit counter information

Make combination of 1X and 2X hit counter if those two are in same group (grouping)

Determine cut conditions on KDC1 & KDC2

Select Hit wires in KDC and Reorder them

check works of the code
Check works of the code

Gravity

  • GREEN region

Selective region

  • RED markers

Selected hit wires

  • BLACK markers

Rejected hit wires

Particle direction

Seems to work well

results of tof cut with grouping
Results of TOF cut withgrouping

Residual

before

after

CH2 , 2.0 [μA] , 76315

Same

σ 150 [μm]

σ 150 [μm]

Multiplicity

CH2 , 2.0 [μA] , 76315

x’

x’

x

x

Shift

~1.2

~2.3

apply to u v layer
Apply to u,v-layer

v v’-layer

Selective region determined by 1X and 2X

Applied to uu’ and vv’ layers , too.

Convert

xx’-layer

check works of the code1
Check works of the code

KDC1

KDC2

v v’

v v’

uu’

uu’

  • GREEN regionSelective region
  • RED markers & linesSelected hit wires
  • BLACK markers & lines Rejected hit wires

particle

particle

x x’

x x’

results of tof cut with grouping all layers
Results of TOF cut withgrouping (all layers)

Residual

before

after

CH2 , 2.0 [μA] , 76315

σ 150 [μm]

σ 150 [μm]

Same

Multiplicity

  • Multiplicity of uu’vv’-layers
  • CH2
    • ~20% reduction
  • 52Cr
    • ~5-10% reduction
results of tof cut with grouping all layers1
Results of TOF cut withgrouping (all layers)

CH2

TOF cut works well

Faster !

Increase !

52Cr

Faster !

52Cr

Increase !

Parameters ?

dc hit info selection with tof
DC hit info. selection with TOF

Stricter TDC cut

Gravity

CUT

Particle direction

~17%

Selective region

Maximum gradient

~8%

CUT

Minimum gradient

results of introduction new code
Results of Introduction new code

CH2

Increased !

52Cr

Increased !

summary
Summary
  • CH2 & H2O Λ issue
    • Improvement of tracking code
      • ¼ σ(CH2) = σ(H2O)

==> ½ σ(CH2) = σ(H2O)

    • Virtual photon flux calc.
    • efficiency
multiplicity improvement history
Multiplicity improvement history

Applied TDC cut

Multiplicity went down !

  • Analysis time
    • 20% reduction for 52Cr
  • Number of Kaon (RUN:77124, 52Cr)
    • 56  70  90  130

DC TOF cut

Matrix

DC TOF cut ‘ (TDC cut)

result of tof cut with grouping
Result of TOF cut withgrouping

Original code

KDC

allowance

select

Pure Selective region

allowance

With “h_dc_tofcut.f”

Optimal allowance

Number of K+ ~2[%] up

Good tracks hid by background appear !

Too strict

experimental setup of jlab e05 1152
Experimental setup of JLab E05-115

Position, angle

e’

K+

Position, angle

experimental setup of jlab e05 1153
Experimental setup of JLab E05-115

Position, angle

e’

Momentum vector

K+

Position, angle

experimental setup of jlab e05 1154
Experimental setup of JLab E05-115

JLab E05-115

p(e,e’K+)Λ,Σ0

~40 hours

(5 shifts)

Missing Mass

Very preliminary

Momentum vector

ktof tdc
KTOF TDC
  • Cut

10000 – 50000 (Current)

18000 – 20500 (New)

Run 76314 for CH2 target

Run 77124 for 52Cr target

data summary
Data Summary

JLab E05-115 (2009/June – 2009/Nov)