Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility

被引：7

作者：

Parker, C. E. ^{[1
]}

Frenje, J. A. ^{[1
]}

Johnson, M. Gatu ^{[1
]}

Schlossberg, D. J. ^{[2
]}

Reynolds, H. G. ^{[3
]}

Hopkins, L. Berzak ^{[2
]}

Bionta, R. ^{[2
]}

Casey, D. T. ^{[2
]}

Felker, S. J. ^{[2
]}

Hilsabeck, T. J. ^{[3
]}

Kilkenny, J. D. ^{[3
]}

Li, C. K. ^{[1
]}

Mackinnon, A. J. ^{[2
]}

Robey, H. ^{[2
]}

Schoff, M. E. ^{[3
]}

Seguin, F. H. ^{[1
]}

Wink, C. W. ^{[1
]}

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

机构：

[1] MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[2] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[3] Gen Atom, San Diego, CA 92186 USA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2018年 / 89卷 / 11期

关键词：

Deuterium - Explosions - Ignition - Neutron spectrometers;

D O I：

10.1063/1.5052184

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The next-generation Magnetic Recoil Spectrometer, called MRSt, will provide time-resolved measurements of the deuterium-tritium-neutron spectrum from inertial confinement fusion implosions at the National Ignition Facility. These measurements will provide critical information about the time evolution of the fuel assembly, hot-spot formation, and nuclear burn. The absolute neutron spectrum in the energy range of 12-16 MeV will be measured with high accuracy (similar to 5%), unprecedented energy resolution (similar to 100 keV) and, for the first time ever, time resolution (similar to 20 ps). Crucial to the design of the system is a CD conversion foil for the production of recoil deuterons positioned as close to the implosion as possible. The foil-on-hohlraum technique has been demonstrated by placing a 1-mm-diameter, 40-mu m-thick CD foil on the hohlraum diagnostic band along the line-of-sight of the current time-integrated MRS system, which measured the recoil deuterons. In addition to providing validation of the foil-on-hohlraum technique for the MRSt design, substantial improvement of the MRS energy resolution has been demonstrated. Published by AIP Publishing.

引用

页数：6

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