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Proceedings Paper

Time-Resolved Spectral Measurements Above 80 A
Author(s): R. L. Kauffman; N. Ceglio; H. Medecki
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Paper Abstract

We have made time-resolved spectral measurements above 80 Å from laser-produced plasmas. These are made using a transmission grating spectrograph whose primary components are a cylindrically-curved x-ray mirror for light collection, a transmission grating for spectral dispersion, and an x-ray streak camera for temporal resolution. A description of the instrument and an example of the data are given. We have built a spectrograph to time resolve the spectrum above 80 A from laser-produced plasmas. Several possible schemes using high-powered lasers have been identified that produce x-ray lasing lines in the 80 Å to 300 Å range.1 This spectrograph has been built to measure the output from these targets. The principal components of the spectrograph are a cylindrically-curved x-ray mirror for light collection, a transmission grating for wavelength dispersion, and a soft x-ray streak camera for x ray detection. These have been combined to produce an instrument having high spectral resolution, E/tL > 200, continuous wavelength coverage from 80 A to 300 A, good time resolution, 1,20 psec, and high sensitivity, 1,10 photons/sec-sr. In addition, because an application is to measure x-ray lasing output, we have devised an optical alignment system which can accurately point the instrument to the target with an accuracy of less than one milliradian. A schematic of the instrument design is shown in Fig. 1. X rays from the target are collected and focused at the detection plane by a cylindrically-curved grazing incidence x-ray mirror. The mirror acts like one element of a Kirkpatrick-Baez x-ray microscope producing a line focus perpendicular to the plane of dispersion. 2 The mirror has an eight meter radius of curvature and operates at an angle of incidence of 4°. It is 68 cm from the target midway between the target and detection circle. This produces a magnification of unity. Spherical aberrations for these conditions are estimated to be less than 10 μm, which is much less than target sizes.

Paper Details

Date Published: 9 January 1984
PDF: 3 pages
Proc. SPIE 0427, High Speed Photography, Videography, and Photonics I, (9 January 1984); doi: 10.1117/12.936265
Show Author Affiliations
R. L. Kauffman, University of California (United States)
N. Ceglio, University of California (United States)
H. Medecki, University of California (United States)


Published in SPIE Proceedings Vol. 0427:
High Speed Photography, Videography, and Photonics I
Dennis L. Paisley, Editor(s)

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