Understanding Fuel Magnetization and Mix Using Secondary Nuclear Reactions in Magneto-Inertial Fusion

被引：102

作者：

Schmit, P. F. ^{[1
]}

Knapp, P. F. ^{[1
]}

Hansen, S. B. ^{[1
]}

Gomez, M. R. ^{[1
]}

Hahn, K. D. ^{[1
]}

Sinars, D. B. ^{[1
]}

Peterson, K. J. ^{[1
]}

Slutz, S. A. ^{[1
]}

Sefkow, A. B. ^{[1
]}

Awe, T. J. ^{[1
]}

Harding, E. ^{[1
]}

Jennings, C. A. ^{[1
]}

Chandler, G. A. ^{[1
]}

Cooper, G. W. ^{[1
]}

Cuneo, M. E. ^{[1
]}

Geissel, M. ^{[1
]}

Harvey-Thompson, A. J. ^{[1
]}

Herrmann, M. C. ^{[1
]}

Hess, M. H. ^{[1
]}

Johns, O. ^{[1
]}

Lamppa, D. C. ^{[1
]}

Martin, M. R. ^{[1
]}

McBride, R. D. ^{[1
]}

Porter, J. L. ^{[1
]}

Robertson, G. K. ^{[1
]}

Rochau, G. A. ^{[1
]}

Rovang, D. C. ^{[1
]}

Ruiz, C. L. ^{[1
]}

Savage, M. E. ^{[1
]}

Smith, I. C. ^{[1
]}

Stygar, W. A. ^{[1
]}

Vesey, R. A. ^{[1
]}

机构：

[1] Sandia Natl Labs, Albuquerque, NM 87185 USA

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 15期

关键词：

PARTICLE STOPPING POWERS; CONFINEMENT FUSION; CYLINDRICAL GEOMETRY; IGNITION CONDITIONS; TARGET FUSION; AREAL DENSITY; ICF TARGETS; IMPLOSIONS; PLASMAS; DRIVEN;

D O I：

10.1103/PhysRevLett.113.155004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Magnetizing the fuel in inertial confinement fusion relaxes ignition requirements by reducing thermal conductivity and changing the physics of burn product confinement. Diagnosing the level of fuel magnetization during burn is critical to understanding target performance in magneto-inertial fusion (MIF) implosions. In pure deuterium fusion plasma, 1.01 MeV tritons are emitted during deuterium-deuterium fusion and can undergo secondary deuterium-tritium reactions before exiting the fuel. Increasing the fuel magnetization elongates the path lengths through the fuel of some of the tritons, enhancing their probability of reaction. Based on this feature, a method to diagnose fuel magnetization using the ratio of overall deuterium-tritium to deuterium-deuterium neutron yields is developed. Analysis of anisotropies in the secondary neutron energy spectra further constrain the measurement. Secondary reactions also are shown to provide an upper bound for the volumetric fuel-pusher mix in MIF. The analysis is applied to recent MIF experiments [M. R. Gomez et al., Phys. Rev. Lett. 113, 155003 (2014)] on the Z Pulsed Power Facility, indicating that significant magnetic confinement of charged burn products was achieved and suggesting a relatively low-mix environment. Both of these are essential features of future ignition-scale MIF designs.

引用

页数：6

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