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Title: Radiochemistry diagnostics for the National Ignition Facility

Abstract

Radiochemistry-based techniques will be an important complement to x-ray implosion diagnostics. Simulations demonstrate the value of alpha-induced or deuteron-induced reactions as a direct measurement of static mix contamination in DT-filled ignition capsules. In this proceedings we examine to what extent neutron-induced reactions might be highly correlated with the energetically down-scattered neutron fraction which is, in turn, related to the critical quantity of fuel areal density, {rho}R. Although alpha and deuteron reactions are highly suppressed in HT/D-filled capsules, neutron-induced reactions produce robust abundances and 2% measurements of the relevant radiological ratios is achievable. We conclude that radiochemical data are strongly correlated with the down-scattered fraction and fuel areal density. Unknown physics, primarily uncertainties in the direct T-T fusion neutron cross section and, to a lesser extent, various radiochemical production cross sections are important but calibration shots can be used to reduce these errors. The primary advantage of radiochemistry remains - it is the only technique that samples down-scattered neutrons from the entire capsule during the burn. In particular radiochemistry correlated with other diagnostics can be used to minimize experimental uncertainties and thus maximize gain.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
976936
Report Number(s):
LLNL-PROC-426088
TRN: US1002744
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Nuclear Explosives Design Physics Conference, livermore, CA, United States, Oct 26 - Oct 30, 2009
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS; 42 ENGINEERING; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 70 PLASMA PHYSICS AND FUSION; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; CALIBRATION; CONTAMINATION; CROSS SECTIONS; DESIGN; DEUTERON REACTIONS; IGNITION; IMPLOSIONS; NEUTRONS; NUCLEAR EXPLOSIVES; PHYSICS; PRODUCTION; RADIOCHEMISTRY; US NATIONAL IGNITION FACILITY

Citation Formats

Hoffman, R D, Cerjan, C J, Shaughnessy, D A, Moody, K J, Nelson, S L, Bernstein, L A, Stoyer, M A, Fortner, R J, and Schneider, D H. Radiochemistry diagnostics for the National Ignition Facility. United States: N. p., 2010. Web.
Hoffman, R D, Cerjan, C J, Shaughnessy, D A, Moody, K J, Nelson, S L, Bernstein, L A, Stoyer, M A, Fortner, R J, & Schneider, D H. Radiochemistry diagnostics for the National Ignition Facility. United States.
Hoffman, R D, Cerjan, C J, Shaughnessy, D A, Moody, K J, Nelson, S L, Bernstein, L A, Stoyer, M A, Fortner, R J, and Schneider, D H. 2010. "Radiochemistry diagnostics for the National Ignition Facility". United States. https://www.osti.gov/servlets/purl/976936.
@article{osti_976936,
title = {Radiochemistry diagnostics for the National Ignition Facility},
author = {Hoffman, R D and Cerjan, C J and Shaughnessy, D A and Moody, K J and Nelson, S L and Bernstein, L A and Stoyer, M A and Fortner, R J and Schneider, D H},
abstractNote = {Radiochemistry-based techniques will be an important complement to x-ray implosion diagnostics. Simulations demonstrate the value of alpha-induced or deuteron-induced reactions as a direct measurement of static mix contamination in DT-filled ignition capsules. In this proceedings we examine to what extent neutron-induced reactions might be highly correlated with the energetically down-scattered neutron fraction which is, in turn, related to the critical quantity of fuel areal density, {rho}R. Although alpha and deuteron reactions are highly suppressed in HT/D-filled capsules, neutron-induced reactions produce robust abundances and 2% measurements of the relevant radiological ratios is achievable. We conclude that radiochemical data are strongly correlated with the down-scattered fraction and fuel areal density. Unknown physics, primarily uncertainties in the direct T-T fusion neutron cross section and, to a lesser extent, various radiochemical production cross sections are important but calibration shots can be used to reduce these errors. The primary advantage of radiochemistry remains - it is the only technique that samples down-scattered neutrons from the entire capsule during the burn. In particular radiochemistry correlated with other diagnostics can be used to minimize experimental uncertainties and thus maximize gain.},
doi = {},
url = {https://www.osti.gov/biblio/976936}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Feb 22 00:00:00 EST 2010},
month = {Mon Feb 22 00:00:00 EST 2010}
}

Conference:
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