Generalizing the moments method for primary neutron spectra

IF 1.6 3区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS High Energy Density Physics Pub Date : 2024-07-23 DOI:10.1016/j.hedp.2024.101128
B.D. Appelbe, A.J. Crilly, C. Pimpirev
{"title":"Generalizing the moments method for primary neutron spectra","authors":"B.D. Appelbe,&nbsp;A.J. Crilly,&nbsp;C. Pimpirev","doi":"10.1016/j.hedp.2024.101128","DOIUrl":null,"url":null,"abstract":"<div><p>Motivated by recent experimental results Hartouni et al. (2023); Mannion et al. (2023) which identified the presence of non-Maxwellian ion velocity distributions in ICF plasmas, we revisit the moments method for analysing the shapes of primary neutron spectra emitted by plasmas undergoing thermonuclear burn. We assume that the ion distribution functions are of an arbitrary form and develop a set of “generalized” moments, that are ordered in terms of increasing powers of centre of mass velocity, but for which the effects of shifts of centre of mass velocity (equivalent to fluid velocity in the case of Maxwellian ion distributions) are suppressed. This set of generalized moments provides the most sensitive measure of relative velocity contributions to the shape of the neutron spectrum (an effect that has been colloquially referred to as “viso”). We also demonstrate that pairs of antipodal neutron spectral detectors are most suitable for measuring these contributions.</p></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"52 ","pages":"Article 101128"},"PeriodicalIF":1.6000,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1574181824000533/pdfft?md5=bc17dc808877ae1942eefac836a5b077&pid=1-s2.0-S1574181824000533-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"High Energy Density Physics","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1574181824000533","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, FLUIDS & PLASMAS","Score":null,"Total":0}
引用次数: 0

Abstract

Motivated by recent experimental results Hartouni et al. (2023); Mannion et al. (2023) which identified the presence of non-Maxwellian ion velocity distributions in ICF plasmas, we revisit the moments method for analysing the shapes of primary neutron spectra emitted by plasmas undergoing thermonuclear burn. We assume that the ion distribution functions are of an arbitrary form and develop a set of “generalized” moments, that are ordered in terms of increasing powers of centre of mass velocity, but for which the effects of shifts of centre of mass velocity (equivalent to fluid velocity in the case of Maxwellian ion distributions) are suppressed. This set of generalized moments provides the most sensitive measure of relative velocity contributions to the shape of the neutron spectrum (an effect that has been colloquially referred to as “viso”). We also demonstrate that pairs of antipodal neutron spectral detectors are most suitable for measuring these contributions.

查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
原生中子谱矩法的推广
最近的实验结果 Hartouni 等人(2023 年)和 Mannion 等人(2023 年)发现 ICF 等离子体中存在非麦克斯韦离子速度分布,受此启发,我们重新审视了矩方法,用于分析发生热核燃烧的等离子体发射的主中子谱形状。我们假定离子分布函数的形式是任意的,并开发了一组 "广义 "矩,这些矩按质量中心速度的增大幂排序,但质量中心速度(在麦克斯韦离子分布情况下相当于流体速度)偏移的影响被抑制了。这组广义矩提供了对中子谱形状的相对速度贡献(俗称 "viso "效应)的最灵敏测量。我们还证明,对偶中子光谱探测器最适合测量这些贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
High Energy Density Physics
High Energy Density Physics PHYSICS, FLUIDS & PLASMAS-
CiteScore
4.20
自引率
6.20%
发文量
13
审稿时长
6-12 weeks
期刊介绍: High Energy Density Physics is an international journal covering original experimental and related theoretical work studying the physics of matter and radiation under extreme conditions. ''High energy density'' is understood to be an energy density exceeding about 1011 J/m3. The editors and the publisher are committed to provide this fast-growing community with a dedicated high quality channel to distribute their original findings. Papers suitable for publication in this journal cover topics in both the warm and hot dense matter regimes, such as laboratory studies relevant to non-LTE kinetics at extreme conditions, planetary interiors, astrophysical phenomena, inertial fusion and includes studies of, for example, material properties and both stable and unstable hydrodynamics. Developments in associated theoretical areas, for example the modelling of strongly coupled, partially degenerate and relativistic plasmas, are also covered.
期刊最新文献
Overview of oxygen opacity experiments at the national ignition facility and investigation of potential systematic errors Editorial Board Fast electron collimation by self-generated magnetic fields at resistivity gradient in imploded plasma A new approach to include electron interaction effects in super transition array opacity theory On the number of atomic configurations in hot plasmas
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1