ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
The reflective properties of a flat Mo/Si multilayer mirror (MLM) optimized for the 230 A(ring)〈λ〈304 A(ring) range (2d=373.2 A(ring), N=25, 25 A(ring)〈Δλ〈50 A(ring)) 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 θ-2θ goniometer. In parallel, high-resolution (Δλ≈1 A(ring)) 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1141832
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