Hlab meeting
22
Hlab meeting 14 Dec 2010 T.Gogami E05-115 experimental setup in JLab Hall C (2009)
description
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. - PowerPoint PPT Presentation
Transcript of Hlab meeting
Hlab meeting14 Dec 2010
T.Gogami
E05-115 experimental setup in JLab Hall C (2009)
Content
• e- , e+ background in HKS
KDC wire configuration
K+
zy
x
uu’xx’
vv’
30°
150°
90°
y
x
Drift chambers in HKS
Multiplicity
Multiplicity is higher for heavy target
KDC wire configuration
K+
zy
x
uu’xx’
vv’ CH2 , 2.0 [μA]
52Cr , 7.6 [μA]
Multiplicity distributiony
x
Number of tracks
Tracking efficiency is lower.Tracking eff. = 80% (Multiplicity = 5 )
TOP view TOP view
KDC1
Black : hit wires Blue : selected wiresRed : track
Black : hit wires Blue : selected wiresRed : track
CH2 52Cr
Resolution
Need to optimize parameters・・・
CH2 , Ibeam = 2.0 [μA]
σ ≈ 170 [μm]
52Cr, Ibeam = 7.6 [μA]
σ ≈ 350 [μm]
e, e+ background (Real data )
PortKDC1
KDC2
KDC1
KDC2
Extension chamber76314 , CH2
port , flange
vacuum chamber side
3000 events
20%2%
e , e+ background in GEANT simulation
• Generated particle : e+
• Distribution : spherical uniform• Momentum : 860 – 1000 [MeV/c]• Angle : 0 – 2 [mrad]• 1000 events
Vacuum chamber(sus304)
NMR port(sus304)
KDC1 KDC2 e- , e+
e , e+ background
• Number (rate)• Angler distribution• Momentum dist.
ELECTRON2344 [MeV]
Target
SIMULATION
Angular and momentum distribution of e+
HKS should not accept e+ directory.
HKS detectors
HKS
D-m
agne
t
Dirty ranking (real data)
Target Run Beam current [μA] B.G. mix rate [%]
CH2 76314 2.0 20.5
H2O 75972 2.7 44.27Li 76220 32.0 10.7
9Be 76607 38.4 14.410B 76184 42.4 9.912C 76077 38.8 19.3
52Cr 77124 7.6 58.7
rank target1 52Cr2 H2O3 CH2
4 12C5 9Be6 7Li7 10B
ab
B.G mix rate =
Target thickness dependence(Simulation)
H2O52Cr9Be
12C CH2
10B
7Li
rank target
1 52Cr
2 H2O
3 CH2
4 12C
5 9Be
6 7Li
7 10B
e , e+ background in GEANT simulation
Vacuum chamber(sus304)
NMR port(sus304)
KDC1 KDC2 • Generated particle : e+
• Distribution : spherical uniform• Momentum : 860 – 1000 [MeV/c]• Angle : 0 – 2 [mrad]• 1000 events
e+ make HKS dirty
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?
–・・・・ KDC1
KDC2
Summary
• e- , e+ background make HKS dirty.– High rate– High multiplicity→ Tracking が大変
END
Target Hypernucleus Thickness[mg/cm2]
Beam Typical rateHES/HKS/COIN
[kHz]Current [μA] Total charge[C]
7Li 7He 184.0 32.0 4.84 2000 / 7 / 0.9
9Be 9Li 188.1 38.3 5.33 2400 / 9 / 1.6
10B 10Be 56.1 38.7 6.25 1300 / 1 / 0.1
12C 12B 112.5 26.8 5.90 1200 / 5 / 1.0
52Cr 52V 134.0154.0
7.6 0.835.53
2000 / 17 / 1.8
Data summary
22nd Indian-summer school (SNP2010)
Λ
Λ
Λ
Λ
Λ
E05-115 ( 2009 Aug – Nov )
Target Hypernucleus Thickness[mg/cm2]
Beam
Current[μA] Total charge[C]
CH2 Λ , Σ0 450.8 2.0 0.28
H2O Λ , Σ0 ~500.0 2.7 0.20
Physics Data
Calibration Data
(@36μA)
KDC1 residual for 52Cr
σ ≈ 350 [μm]
Strangeness 2010 at KEK
Tracking for high multiplicity
CH2 target
particleCH2 target
mean ~ 2 hit
52Cr target
mean ~ 6 hit
52Cr target
particle KDC1 trackingBlue : selected wiresBlack: hit wires
Multiplicity of typical layer
Multiplicity
Trac
king
eff.
52CrCH2
Developing new code
Traditional JLab Hall-C tracking code cannot handle with high multiplicity data.
HKS detectors
Strangeness 2010 at KEK
K+
p, π+
Drift chambers-KDC1,KDC2-TOF walls -2X,1Y,1X-
(Plastic scintillators)
Cherenkov detectors -AC,WC-• Aerogel (n=1.05)• Water (n=1.33)
1 [m] June 2009 in JLab Hall-C
HKS trigger• CP = 1X ×1Y × 2X • K = WC × AC
CP × K
~18 [kHz](8 [μA] on 52Cr)
−π+
K+
p
σ ≈ 250 [μm]TOF σ ≈ 170 [ps]
Strangeness 2010 at KEK
HES DetectorsDrift chambers- EDC1 , EDC2 -
TOF walls - EH1 , EH2 - (Plastic scintillators)
HES D magnet
HES triggerEH1 × EH2
~2 [MHz](8 [μA] on 52Cr)e
Time Of Flight
σ ~ 300 [ps]
Target Hypernucleus Thickness[mg/cm2]
Beam Typical rateHES/HKS/COIN
[kHz]Current [μA] Total charge[C]
7Li 7He 184.0 32.0 4.84 2000 / 7 / 0.9
9Be 9Li 188.1 38.3 5.33 2400 / 9 / 1.6
10B 10Be 56.1 38.7 6.25 1300 / 1 / 0.1
12C 12B 112.5 26.8 5.90 1200 / 5 / 1.0
52Cr 52V 134.0154.0
7.6 0.835.53
2000 / 17 / 1.8
Data summary
22nd Indian-summer school (SNP2010)
Λ
Λ
Λ
Λ
Λ
E05-115 ( 2009 Aug – Nov )
Target Hypernucleus Thickness[mg/cm2]
Beam
Current[μA] Total charge[C]
CH2 Λ , Σ0 450.8 2.0 0.28
H2O Λ , Σ0 ~500.0 2.7 0.20
Physics Data
Calibration Data
(@36μA)
