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Proceedings Paper

The joint astrophysical plasmadynamic experiment extreme ultraviolet spectrometer: resolving power
Author(s): F. B. Berendse; R. G. Cruddace; M. P. Kowalski; D. J. Yentis; W. R. Hunter; G. G. Fritz; O. Siegmund; K. Heidemann; R. Lenke; A. Seifert; T. W. Barbee Jr.
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Paper Abstract

The Joint astrophysical Plasmadynamic EXperiment (J-PEX) is a high-resolution extreme ultraviolet (EUV) spectrometer (220-245 Å) used for the study of white dwarf atmospheres. Significant improvements have been achieved in both the normal-incidence gratings and the focal-plane detector since its first successful sounding rocket flight in 2001. The spherical laminar gratings have been replaced by paraboloidal gratings. The substrates of the new gratings have measured slope errors less than 0.35 arcsec. The gratings were recorded holographically and the rulings transferred into the silica substrates by ion etching. This procedure was followed by polymer overcoat to reduce the blaze angle of the groove profile. The detector uses microchannel plates with 6 μm pores and a cross-strip anode, providing 17.9 μm resolution in the dispersion direction. The detector employs a KBr photocathode with a projected efficiency of 0.24 at 256 Å. Using ray tracing simulations, we predict the resolving power expected from the spectrometer during upcoming EUV calibrations with a He II discharge source.

Paper Details

Date Published: 20 June 2006
PDF: 11 pages
Proc. SPIE 6266, Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray, 62660V (20 June 2006); doi: 10.1117/12.670064
Show Author Affiliations
F. B. Berendse, Naval Research Lab. (United States)
R. G. Cruddace, Naval Research Lab. (United States)
M. P. Kowalski, Naval Research Lab. (United States)
D. J. Yentis, Naval Research Lab. (United States)
W. R. Hunter, SFA, Inc. (United States)
G. G. Fritz, PRAXIS, Inc. (United States)
O. Siegmund, Sensor Sciences LLC (United States)
K. Heidemann, Carl Zeiss Optronics GmbH (Germany)
R. Lenke, Carl Zeiss Optronics GmbH (Germany)
A. Seifert, Carl Zeiss Optronics GmbH (Germany)
T. W. Barbee Jr., Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 6266:
Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray
Martin J. L. Turner; Günther Hasinger, Editor(s)

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