Evaluation of a multilayer mirror spectrometer in the 230--304 A wavelength range

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Review of Scientific Instruments; (USA)

DOI:https://doi.org/10.1063/1.1141832· OSTI ID:6147587

Regan, S P; Zwicker, A P; Finkenthal, M; Moos, H W ^[1]; Barbee, Jr, T W ^[2]

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1. Johns Hopkins University, Baltimore, MD (USA)
2. Lawrence Livermore National Laboratory, Livermore, CA (USA)

The reflective properties of a flat Mo/Si multilayer mirror (MLM) optimized for the 230 A{lt}{lambda}{lt}304 A range (2{ital d}=373.2 A, {ital N}=25, 25 A{lt}{Delta}{lambda}{lt}50 A) have been measured. A near-normal incidence spectrometer using the MLM as the dispersive element, a beryllium foil as a light blocking filter, and a channel electron multiplier as the photodetector has been built. The interest in such a device is related to its possible application as a monitor of alpha particles by imaging the whole plasma using the Lyman series of He II. In the laboratory experiment described here, the Lyman series of He II, emitted from a Penning ionization discharge, were scanned with a {theta}-2{theta} goniometer. In parallel, high-resolution ({Delta}{lambda}{approx}1 A) spectra were also recorded using a 1 m grazing incidence (GI) spectrometer. Comparisons are made between the high-resolution (GI) spectrum modeled to the bandpass of the MLM and the low-resolution (MLM) spectrum in the range of interest.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6147587
• Journal Information: Review of Scientific Instruments; (USA), Journal Name: Review of Scientific Instruments; (USA) Vol. 61:10; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

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700102 -- Fusion Energy-- Plasma Research-- Diagnostics
ALPHA SPECTROMETERS
DESIGN
ELECTRIC DISCHARGES
MEASURING INSTRUMENTS
MIRRORS
PENNING DISCHARGES
PLASMA DIAGNOSTICS
RESOLUTION
SPECTROMETERS
ULTRAVIOLET SPECTROMETERS