A fiber optic array for continuous energy coverage in a gamma ray spectrometer

Conference · Wed Jul 01 04:00:00 EDT 1992

OSTI ID:10153681

Cochran, C W; Kammeraad, J E; Sale, K E; Lown, J G; Robson, J D ^[1]; Marroquin, J P; Sanchez, A Jr ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. EG and G Energy Measurements, Inc., Las Vegas, NV (United States)

Optical fibers are being used to obtain full coverage over a range of energies in a multi-channel, time-resolved gamma ray spectrometer. Gamma rays are incident upon a beryllium foil 60cm from the entrance port of a Sm-Co magnet. Compton electrons from the foil are focussed according to their energy onto quartz optical fibers arrayed in close-packed configuration behind a low-Z vacuum window at the focal plane. Cerenkov radiation produced inside each of the fibers propagates down the fiber which is brought out of the magnet. Fibers are grouped into preselected energy bins corresponding to streak record channel assignments. The light from the fibers in an energy bin are combined into one signal and then transmitted to a streak camera with a specified number of channels. This unique optical fiber array serves both as the detector and as a means to define energy bins of our choosing for a streak camera recording system.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10153681
• Report Number(s): UCRL-JC--107306; CONF-920792--54; ON: DE93012489
• Country of Publication: United States
• Language: English

Related Subjects

440103
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BEAM OPTICS
BERYLLIUM
CHERENKOV RADIATION
COMPTON SPECTROMETERS
DESIGN
FIBER OPTICS
GAMMA DETECTION
NUCLEAR SPECTROSCOPIC INSTRUMENTATION
OPTICAL FIBERS
STREAK CAMERAS
TARGETS