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Proceedings Paper

The Technique Of Point Projection Spectroscopy And Its Application To The Planar Foil Mix Experiment At The AWE HELEN Laser
Author(s): P. A. Rosen; P. Fieldhouse; J. C. V. Hansom; K. Oades; T. J. Goldsack; R. E. Powell; J. Read
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Paper Abstract

Point Projection Spectroscopy (PPSY is now well established as the principal diagnostic of the Planar Foil Mix Experiment on the HELEN laser at AWE. In this experiment measurements of hydrodynamic mix are made on a radiatively driven package comprising an ablator,foil and tamper. A separate laser beam is used to produce a point source of X-rays to backlight the package a few nanoseconds after the main drive pulse. The X-rays are diffracted from a suitable Bragg crystal onto a piece of film which is subsequently developed, digitised and the data processed using a computer analysis code. Results of this single-frame technique are presented. A recent development has been to split the backlighter beam into two separately focussable halves enabling two frames of information to be obtained along orthogonal lines-of-sight on each shot. The frames can be separated in time to give the temporal evolution of the package, or taken in coincidence to give two measurements simultaneously.

Paper Details

Date Published: 27 November 1989
PDF: 12 pages
Proc. SPIE 1140, X-Ray Instrumentation in Medicine and Biology, Plasma Physics, Astrophysics, and Synchrotron Radiation, (27 November 1989); doi: 10.1117/12.961840
Show Author Affiliations
P. A. Rosen, Atomic Weapons Establishment (United Kingdom)
P. Fieldhouse, Atomic Weapons Establishment (United Kingdom)
J. C. V. Hansom, Atomic Weapons Establishment (United Kingdom)
K. Oades, Atomic Weapons Establishment (United Kingdom)
T. J. Goldsack, Atomic Weapons Establishment (United Kingdom)
R. E. Powell, Atomic Weapons Establishment (United Kingdom)
J. Read, Atomic Weapons Establishment (United Kingdom)

Published in SPIE Proceedings Vol. 1140:
X-Ray Instrumentation in Medicine and Biology, Plasma Physics, Astrophysics, and Synchrotron Radiation

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