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Title: Hard x-ray detectors for OMEGA and NIF

Abstract

Laser--plasma instabilities that produce an unacceptably high level of hot electrons are potentially dangerous for both direct-drive and indirect-drive inertial confinement laser fusion. The hot electrons preheat the fuel and prevent compression of the capsule to the requisite conditions for ignition. Fast electron generation and preheat can be inferred from the hard x-ray radiation generated by the interaction of the hot electrons with the target. On the University of Rochesters OMEGA laser system, time-resolved hard x-ray detectors have been operating in an energy range from 10 to 500 keV. In this article we will present initial results for the yield and spectrum of the hard x-ray radiation. The concept used on OMEGA can be easily extended to infer the amount of laser energy coupled to suprathermal electrons and to the target for both direct- and indirect-drive implosions on the upcoming National Ignition Facility, as well as to measure the conversion efficiency in high-x-ray-yield experiments.

Authors:
; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
(US)
OSTI Identifier:
40204789
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 72; Journal Issue: 1; Other Information: Othernumber: RSINAK000072000001001197000001; 668101CON; PBD: Jan 2001; Journal ID: ISSN 0034-6748
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPRESSION; EFFICIENCY; ELECTRONS; ENERGY RANGE; IGNITION; IMPLOSIONS; INERTIAL CONFINEMENT; LASERS; PHYSICS; RADIATIONS; TARGETS; US NATIONAL IGNITION FACILITY

Citation Formats

Stoeckl, C, Glebov, V Yu, Meyerhofer, D D, Seka, W, Yaakobi, B, Town, R P. J., and Zuegel, J D. Hard x-ray detectors for OMEGA and NIF. United States: N. p., 2001. Web. doi:10.1063/1.1322621.
Stoeckl, C, Glebov, V Yu, Meyerhofer, D D, Seka, W, Yaakobi, B, Town, R P. J., & Zuegel, J D. Hard x-ray detectors for OMEGA and NIF. United States. doi:10.1063/1.1322621.
Stoeckl, C, Glebov, V Yu, Meyerhofer, D D, Seka, W, Yaakobi, B, Town, R P. J., and Zuegel, J D. Mon . "Hard x-ray detectors for OMEGA and NIF". United States. doi:10.1063/1.1322621.
@article{osti_40204789,
title = {Hard x-ray detectors for OMEGA and NIF},
author = {Stoeckl, C and Glebov, V Yu and Meyerhofer, D D and Seka, W and Yaakobi, B and Town, R P. J. and Zuegel, J D},
abstractNote = {Laser--plasma instabilities that produce an unacceptably high level of hot electrons are potentially dangerous for both direct-drive and indirect-drive inertial confinement laser fusion. The hot electrons preheat the fuel and prevent compression of the capsule to the requisite conditions for ignition. Fast electron generation and preheat can be inferred from the hard x-ray radiation generated by the interaction of the hot electrons with the target. On the University of Rochesters OMEGA laser system, time-resolved hard x-ray detectors have been operating in an energy range from 10 to 500 keV. In this article we will present initial results for the yield and spectrum of the hard x-ray radiation. The concept used on OMEGA can be easily extended to infer the amount of laser energy coupled to suprathermal electrons and to the target for both direct- and indirect-drive implosions on the upcoming National Ignition Facility, as well as to measure the conversion efficiency in high-x-ray-yield experiments.},
doi = {10.1063/1.1322621},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 1,
volume = 72,
place = {United States},
year = {2001},
month = {1}
}