AMS02: Anti Coincidence Counter ACC

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AMS-02 Anti Coincidence Counter ACC

• The ACC detects unwanted
• particle tracks running
• through the tracker volume
• outside the main acceptance
• mimicking anti-nuclei.
• Requirements
• High detection efficiency
• operational in high field
• fast response for trigger

Th. Kirn
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ACC System
Panel Bicron BC414 (826.5 x 230 x 8 mm³) WLS
Kuraray Y-11(200)M CLF Bicron BCF-98 / Toray
PJU-FB1000 PMT Hamamatsu R5946
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AMS-01 ACC, ETH Zürich, July 1997
Panel Bicron BC414 WLS-Fibers Kuraray
Y-11(200)M Vibration tests and TVT tests
performed for AMS-01 (STS-91)
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ACC Scintillation panel
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ACC Scintillaton Panel machining
machining (grooves) all (164) done
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ACC Scintillation Panel Production
Machining of panel
Curing of glue
WLS ? Panel
Wrapping Optical Coupling
Fiber Bending Protection Viton Tube UV-LED
Final Scintillation Panel
All (164) done
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ACC Scintillaton Panel WLS Fibers Attenuation
Length
? Core
? Cladding
?39833 cm
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ACC Optical Couplings WLS Fiber ? Clear Fiber ?
PMT
Clear Fiber Cable
WLS ? Clear Fiber
Clear Fiber ? PMT
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ACC Clear Fibers Bicron BCF-98 or Toray
PJU-FB1000
LED (?375 nm)
PMT
PMT
Coupling WLS Fibre ? Clear Fibre
Bicron BCF-98 Toray PJU-FB1000
Configuration Light
Output WLS PMT
100 WLS Bicron BCF-98 PMT
43 WLS Toray PJU-FB1000 PMT 71
Coupling 51 (2.95 db), ? 6.6 m (0.75 dB)
Coupling 73 (1.35 db), ? 33 m (0.15 dB)
?Toray PJU-FB1000 better aperture matching, less
damping
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ACC WLS Fibers - Clear Fibers Farfield
Measurements (POFAC FH Nürnberg)
WLS
Toray PJU-FB1000
Bicron BCF 98
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ACC PMT Hamamatsu R5946
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ACC PMT 4 Hamamatsu R5946 in Box
Vibration Testing and Thermal Vacuum Testing are
ongoing