Difference between revisions of "Specification for pair spectrometer hodoscopes"
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− | The | + | The following paragraphs describe the pair spectrometer hodoscope in Hall B (Primex spectrometer). |
Electrons and positrons produced in a thin converter foil and deflected in the 1.5Tm dipole magnet are momentum analyzed using a symmetric set of 16 scintillators on each side. The scintillators are positioned in two layers of 8 counters each allowing for front-back coincidences. | Electrons and positrons produced in a thin converter foil and deflected in the 1.5Tm dipole magnet are momentum analyzed using a symmetric set of 16 scintillators on each side. The scintillators are positioned in two layers of 8 counters each allowing for front-back coincidences. | ||
+ | * scintillator size: | ||
+ | front: 2.4 cm wide, 7.5 cm long, 0.5 cm thick | ||
+ | back: 3.9 cm wide, 9.3 cm long, 2.0 cm thick | ||
+ | * PMTs: front: Hamamatsu R6427, back: | ||
+ | Hamamatsu R580-17 (with <mu>-metal shielding). | ||
+ | * Scintillator, light guides, and PMT are glued with optical cement. |
Revision as of 19:28, 16 February 2008
The following paragraphs describe the pair spectrometer hodoscope in Hall B (Primex spectrometer). Electrons and positrons produced in a thin converter foil and deflected in the 1.5Tm dipole magnet are momentum analyzed using a symmetric set of 16 scintillators on each side. The scintillators are positioned in two layers of 8 counters each allowing for front-back coincidences.
- scintillator size:
front: 2.4 cm wide, 7.5 cm long, 0.5 cm thick back: 3.9 cm wide, 9.3 cm long, 2.0 cm thick
- PMTs: front: Hamamatsu R6427, back:
Hamamatsu R580-17 (with <mu>-metal shielding).
- Scintillator, light guides, and PMT are glued with optical cement.