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

Conference · Sun Jun 01 00:00:00 EDT 1986

OSTI ID:5534900

Gerassimenko, M; Fowler, M C

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
• Resource Relation: Conference: 30. SPIE technical symposium on optics and optoelectronic engineering, San Diego, CA, USA, 17 Aug 1986
• Country of Publication: United States
• Language: English

Related Subjects

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