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Slitless, intensified readout, gated spectrometer: wavelength and efficiency calibration, time response characterization

Conference ·
OSTI ID:5534900
;
A spectrometer has been developed specifically for the x-ray laser effort at Lawrence Livermore National Laboratory (LLNL). The instrument takes advantage of the small divergence and size of the lasing source by positioning all three components - the source, a custom-ruled grating, and a microchannel plate (MCP) detector - on the Rowland circle. The sum of incident and diffracted angles is kept constant. Illuminating a pinhole at the source location with a z-pinch produces wavelength calibration at several energy ranges in the 65- to 200-eV interval. The same source used in conjunction with the MCP camera and Kodak 101 film yields the absolute detector efficiency. Ion bombardment of a beryllium target at the source location produces the X-rays necessary to determine the absolute efficiency of the grating-detector combination at 107 eV. Grating efficiency is then deduced from the MCP efficiency at that energy. Three 25-..cap omega.. stripline structures on the MCP allow sub-nanosecond gating of the spectrometer, which improves the signal-to-background ratio. The rise time response of the entire MCP detector-cable assembly is about 200 ps. We also measured the transmission of the filters that are used in suppressing ultraviolet backgrounds.
Research Organization:
Lawrence Livermore National Lab., CA (USA)
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
5534900
Report Number(s):
UCRL-94098; CONF-860880-10; ON: DE86012349
Country of Publication:
United States
Language:
English

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Related Subjects

440103* -- Radiation Instrumentation-- Nuclear Spectroscopic Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CALIBRATION
DESIGN
EFFICIENCY
ELECTRON MULTIPLIERS
ELECTRON TUBES
ENERGY RESOLUTION
FILTERS
GRATINGS
MEASURING INSTRUMENTS
MICROCHANNEL ELECTRON MULTIPLIERS
RESOLUTION
SPECTROMETERS
TIMING PROPERTIES
X-RAY SPECTROMETERS