PEBS - P ositron E lectron B alloon S pectrometer Detector Concept CERN, January 2009
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PEBS - Positron Electron Balloon SpectrometerDetector Concept
CERN, January 2009
Stefan SchaelI. Physikalisches Institut BRWTH Aachen
PEBS-ECAL
TRD 1
TRD 2
1.2 m
1.0 m
0.86 m
2.0 m
Physic-Programm:• Positron – Spectrum 1 GeV - 700 GeV• Electron – Spectrum 1 GeV – 1000 GeV
B-Field: 0.7 TeslaSuperconducting magnet, 850 kg
Acceptance: 3000 cm2 sr
6 Si-Inner-Tracker Planes (red),single Point resolution 0.010 mm4 ScFi-Outer Tracker Planes (pink)single Point resolution 0.050 mm
momentum resolution:20% @ 1000 GeV
2 TRD‘s, each with 12 layers,Proton Rejection 104 @ 100 GeVElectron Efficiency 80%
11 X0 ECAL, Weight 650 kg
Weight: 1700 kg
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Inner Si Tracker Upper SciFi TrackerUpper SciFi Tracker
Circle-FitInner Si Tracker: B=0.7 Tesla, L=1m, nLayer=6, σx=0.010 mm
σ P
P=
σ x ⋅P0.3 ⋅B ⋅L2
720
nLayer + 4= 0.0004 ⋅ p
σ PP
=σ x ⋅P
0.3 ⋅B ⋅L2
256
nLayer= 0.0003 ⋅ p
Circle − Fit :σ PP
= 0.00032 ⋅ p
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Inner Si Tracker Upper SciFi TrackerUpper SciFi Tracker
Angle-Point - MeasurementInner Si Tracker: B=0.7 Tesla, Lin =1.0 m, nLayer=4, σin=0.010 mmUpper SciFi-Tracker: Lup=1.2 m, nLayer=4, σup=0.050 mm
σ P
P=
2 ⋅P0.3 ⋅Lin ⋅B
σ up2 Lin
2 + σ in2 (Lin + Lup )
2 + σ in2 Lup
2
Lup2 Lin
2= 0.00024 ⋅P
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Inner Si Tracker Upper SciFi TrackerUpper SciFi Tracker
Angle-Angle - MeasurementInner Si Tracker: B=0.7 Tesla, Lin =1.0 m, nLayer=4, σin =0.010 mmUpper SciFi-Tracker: Lup =1.2 m, nLayer=4, σout=0.050 mmLower SciFi-Tracker: Ldown=1.2 m, nLayer=4, σout=0.050 mm
σ P
P=
P
0.3 ⋅Lin ⋅B
(σ out2 + σ in
2 )(Lup2 + Ldown
2 )
Lup2 Ldown
2= 0.00014 ⋅P
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No correlation visible for Circle-Fit and Angle-Point measurement=> take the weighted mean
PEBS: σ P
P=0.00020 ⋅P
AMS-2:σ P
P=0.00045 ⋅P
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Z=2.2m
L=1m
σ P
P=
σ 2
Z
Z − L⊕σ 3 ⊕σ 1
L
Z − L
0.3 BL232 + BL12 ⋅L − BL12
2 L
Z − L
⋅P = 0.00023⋅P
BL232 = B(z ')dz '
z2
z
∫⎡
⎣⎢⎢
⎤
⎦⎥⎥dz
z2
z3
∫ BL122 = B(z ')dz '
z1
z
∫⎡
⎣⎢⎢
⎤
⎦⎥⎥dz
z1
z2
∫ BL12 = B(z)dzz1
z2
∫
z [m]
z1z2z3
PEBS - RICH
Physic-Programm:• Positron/Electron – Spectrum up to 200 GeV• He3/He4 for 1 GeV/n <= E/n <= 100 GeV/n• Be10/Be9 for 1 GeV/n <= E/n <= 100 GeV/n
Weight Budget for RICH 600 kgTRD 1
TRD 2
GasRICH
AerogelRICH
TRD 1
TRD 2
U-TRD
SRDPEBS - SRD
Physic-Programm:• Positron – Spectrum 1 GeV - 1500 GeV• Electron – Spectrum 1 GeV – 3000 GeV
U-TRD: 12 Layer upper TRDProton Rejection 36 Layer TRD5 104 @ 500 GeV Electron Efficiency 70%Weight 50 kg
Weight Budget for SRD (green) 400 kgSRD Acceptance 100,000 cm2 sr
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