The conceptual design of 1-ps time resolution neutron detector for fusion reaction history measurement at OMEGA and the National Ignition Facility.
The conceptual design of 1-ps time resolution neutron detector for fusion reaction history measurement at OMEGA and the National Ignition Facility.
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用于 OMEGA 和国家点火装置聚变反应历史测量的 1-ps 时间分辨率中子探测器的概念设计。
DOI：
10.1063/1.5143657
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
R. Petrasso
中科院分区：
文献类型：
--
作者：
Y. Arikawa;M. Ota;M. Nakajima;Tomoki Shimizu;S. Segawa;Thanh Nhat Khoa Phan;Y. Sakawa;Y. Abe;A. Morace;S. R. Mirfayzi;A. Yogo;S. Fujioka;M. Nakai;H. Shiraga;H. Azechi;R. Kodama;K. Kan;J. Frenje;M. Gatu Johnson;A. Bose;N. Kabadi;G. Sutcliffe;P. Adrian;Chikang Li;F. Séguin;R. Petrasso
核燃烧历史提供了关于惯性约束聚变(ICF)内爆热点形成和高密度燃料壳组件的动力学的关键信息，以及关于α加热的影响的信息，以及多种内爆失效机制的信息。掌握这些信息对于评估能量限制时间τE和内爆的性能至关重要。由于ICF内爆的约束时间为几十皮秒，因此精确测量核燃烧历史所需的时间分辨率不到10ps。在这项研究中，我们提出了一种新的基于Pockels效应的1-ps时间分辨率检测方案。特别是，国家点火设施和欧米茄实验的概念设计在这里进行了详细阐述。一个小的有机普克尔斯晶体“DAST”被设计成放置在距离ICF内爆5 mm的地方，由飞秒激光通过偏振保持光纤传输产生的啁啾脉冲进行扫描。当普克尔斯晶体受到中子照射时，将原来的线偏振激光器转变为椭圆偏振激光器，并对偏振的调制进行了分析。我们对35 MeV电子的研究表明，系统的冲激响应为0.6ps。该系统的响应时间比目前的系统短几个数量级。通过以前所未有的时间分辨率测量核燃烧历史，该系统将有助于更好地了解热点形成、高密度燃料壳组件的动力学以及热核燃烧波的传播物理。
The nuclear burn history provides critical information about the dynamics of the hot-spot formation and high-density fuel-shell assembly of an Inertial Confinement Fusion (ICF) implosion, as well as information on the impact of alpha heating, and a multitude of implosion failure mechanisms. Having this information is critical for assessing the energy-confinement time τE and performance of an implosion. As the confinement time of an ICF implosion is a few tens of picoseconds, less than 10-ps time resolution is required for an accurate measurement of the nuclear burn history. In this study, we propose a novel 1-ps time-resolution detection scheme based on the Pockels effect. In particular, a conceptual design for the experiment on the National Ignition Facility and OMEGA are elaborated upon herein. A small organic Pockels crystal "DAST" is designed to be positioned ∼5 mm from the ICF implosion, which is scanned by a chirped pulse generated by a femto-second laser transmitted through a polarization-maintained optical fiber. The originally linearly polarized laser is changed to an elliptically polarized laser by the Pockels crystal when exposed to neutrons, and the modulation of the polarization will be analyzed. Our study using 35-MeV electrons showed that the system impulse response is 0.6 ps. The response time is orders of magnitude shorter than current systems. Through measurements of the nuclear burn history with unprecedented time resolution, this system will help for a better understanding of the dynamics of the hot-spot formation, high-density fuel-shell assembly, and the physics of thermonuclear burn wave propagation.
FIRE-X 快速响应中子闪烁探测器
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
Y. Arikawa;M. Nakai;T. Watari;H. Hosoda;K. Takeda;T. Fujiwara;Y. Furukawa;T. Norimatsu;H. Shiraga;N. Sarukura and H. Azechi
通讯作者：
N. Sarukura and H. Azechi
影响因子：
3.8
作者：
Nakajima, M.;Namai, A.;Suemoto, T.
通讯作者：
Suemoto, T.