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Title: Diagnosing ignition with DT reaction history

Abstract

A full range DT reaction history of an ignition capsule, from 10{sup 9} to 10{sup 20} neutrons/ns, offers the opportunity to diagnose fuel conditions hundreds of picoseconds before and during burn. The burn history begins with a sharp rise when the first shock reaches the center of the capsule. The level of this jump reflects the combined shock strength and the adiabat of DT fuel. Changes to the four laser pulses driving the capsule implosion which are large enough to degrade the yield make measurable changes to the reaction history. Low mode asymmetries grow during convergence but change the reaction history during the final {approx}100 ps. High mode asymmetry or turbulence mixing affects only the reaction history within {approx}50 ps of peak burn rate. A capsule with a tritium fuel layer containing a small amount of deuterium ({approx}1%) creates a reaction history similar to the ignition capsule, but without the final ignition burn. A combination of gas Cerenkov detectors and the neutron temporal diagnostic could be capable of diagnosing the full history of ignition and tritium rich capsules.

Authors:
; ;  [1]; ; ; ;  [2];  [3]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
  3. L.L.E., University of Rochester, Rochester, New York 14623 (United States)
Publication Date:
OSTI Identifier:
21266514
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 79; Journal Issue: 10; Other Information: DOI: 10.1063/1.2969420; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 36 MATERIALS SCIENCE; ASYMMETRY; CAPSULES; CHERENKOV COUNTERS; DEUTERIUM; LASERS; NEUTRONS; PLASMA; THERMONUCLEAR REACTORS; TRITIUM; TURBULENCE

Citation Formats

Wilson, D C, Bradley, P A, Herrmann, H W, Cerjan, C J, Salmonson, J D, Spears, B K, Hatchet, II, S P, and Glebov, V Yu. Diagnosing ignition with DT reaction history. United States: N. p., 2008. Web. doi:10.1063/1.2969420.
Wilson, D C, Bradley, P A, Herrmann, H W, Cerjan, C J, Salmonson, J D, Spears, B K, Hatchet, II, S P, & Glebov, V Yu. Diagnosing ignition with DT reaction history. United States. doi:10.1063/1.2969420.
Wilson, D C, Bradley, P A, Herrmann, H W, Cerjan, C J, Salmonson, J D, Spears, B K, Hatchet, II, S P, and Glebov, V Yu. Wed . "Diagnosing ignition with DT reaction history". United States. doi:10.1063/1.2969420.
@article{osti_21266514,
title = {Diagnosing ignition with DT reaction history},
author = {Wilson, D C and Bradley, P A and Herrmann, H W and Cerjan, C J and Salmonson, J D and Spears, B K and Hatchet, II, S P and Glebov, V Yu},
abstractNote = {A full range DT reaction history of an ignition capsule, from 10{sup 9} to 10{sup 20} neutrons/ns, offers the opportunity to diagnose fuel conditions hundreds of picoseconds before and during burn. The burn history begins with a sharp rise when the first shock reaches the center of the capsule. The level of this jump reflects the combined shock strength and the adiabat of DT fuel. Changes to the four laser pulses driving the capsule implosion which are large enough to degrade the yield make measurable changes to the reaction history. Low mode asymmetries grow during convergence but change the reaction history during the final {approx}100 ps. High mode asymmetry or turbulence mixing affects only the reaction history within {approx}50 ps of peak burn rate. A capsule with a tritium fuel layer containing a small amount of deuterium ({approx}1%) creates a reaction history similar to the ignition capsule, but without the final ignition burn. A combination of gas Cerenkov detectors and the neutron temporal diagnostic could be capable of diagnosing the full history of ignition and tritium rich capsules.},
doi = {10.1063/1.2969420},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 79,
place = {United States},
year = {2008},
month = {10}
}