Improvements to a high-frequency fiber-optic system for plasma diagnostics
Conference
·
OSTI ID:6457170
A system for high-frequency recording of plasma diagnostics has previously been reported. Substantial improvements have been made in the system response, dynamic range, and calibration of the system. Plastic-clad silica fiber is used as a radiation-to-light converter using the Cerenkov process. A spectral equalizer device is used to compensate for the material dispersion in the fiber, increasing the frequency response (approx. = 1 GHz-km) and the dynamic range (a factor of > 20 over a FWHM 1 nm, 50% transmitting interference filter). The calibration system uses a pulsed injection laser diode (< 100 ps FWHM) injected into the fiber at the radiation end of the fiber and detected by a microchannel plate photomultiplier tube on the recording end. The injection laser diode is triggered by a synchronous trigger delay unit, which also triggers a sampling or real time scope after as much as 10 ..mu..s delay with < 50 ps jitter. The system improvements are described in detail and the utility of these components in other plasma diagnostic systems is discussed.
- Research Organization:
- Los Alamos National Lab., NM (USA); EG and G, Inc., Santa Barbara, CA (USA); EG and G, Inc., Las Vegas, NV (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6457170
- Report Number(s):
- LA-UR-81-2136; CONF-810810-18; ON: DE81028741
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
440300 -- Miscellaneous Instruments-- (-1989)
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450200* -- Military Technology
Weaponry
& National Defense-- Nuclear Explosions & Explosives
47 OTHER INSTRUMENTATION
CALIBRATION
CHERENKOV COUNTERS
CHERENKOV RADIATION
DETECTION
ELECTROMAGNETIC RADIATION
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IONIZING RADIATIONS
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MEASURING INSTRUMENTS
NEVADA TEST SITE
NUCLEAR EXPLOSIONS
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RADIATIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450200* -- Military Technology
Weaponry
& National Defense-- Nuclear Explosions & Explosives
47 OTHER INSTRUMENTATION
CALIBRATION
CHERENKOV COUNTERS
CHERENKOV RADIATION
DETECTION
ELECTROMAGNETIC RADIATION
EXPLOSIONS
FIBER OPTICS
GAMMA DETECTION
GAMMA RADIATION
IONIZING RADIATIONS
LASERS
MEASURING INSTRUMENTS
NEVADA TEST SITE
NUCLEAR EXPLOSIONS
PHOTOMULTIPLIERS
PHOTOTUBES
PLASMA DIAGNOSTICS
RADIATION DETECTION
RADIATION DETECTORS
RADIATIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS