Phased plan for the implementation of the time-resolving magnetic recoil spectrometer on the National Ignition Facility (NIF)

被引：0

作者：

Kunimune, J. H. ^{[1
]}

Johnson, M. Gatu ^{[1
]}

Moore, A. S. ^{[2
]}

Trosseille, C. A. ^{[2
]}

Johnson, T. M. ^{[1
]}

Berg, G. P. A. ^{[3
]}

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

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

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

机构：

[1] MIT, PSFC, Cambridge, MA 02139 USA

[2] LLNL, Livermore, CA 94550 USA

[3] Dept Phys & Astron, Notre Dame, IN 46556 USA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2023年 / 93卷 / 08期

关键词：

D O I：

暂无

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The time-resolving magnetic recoil spectrometer (MRSt) is a transformative diagnostic that will be used to measure the time-resolved neutron spectrum from an inertial confinement fusion implosion at the National Ignition Facility (NIF). It uses a CD foil on the outside of the hohlraum to convert fusion neutrons to recoil deuterons. An ion-optical system positioned outside the NIF target chamber energy-disperses and focuses forward-scattered deuterons. A pulse-dilation drift tube (PDDT) subsequently dilates, un-skews, and detects the signal. While the foil and ion-optical system have been designed, the PDDT requires more development before it can be implemented. Therefore, a phased plan is presented that first uses the foil and ion-optical systems with detectors that can be implemented immediately-namely CR-39 and hDISC streak cameras. These detectors will allow the MRSt to be commissioned in an intermediate stage and begin collecting data on a reduced timescale, while the PDDT is developed in parallel. A CR-39 detector will be used in phase 1 for the measurement of the time-integrated neutron spectra with excellent energy-resolution, necessary for the energy calibration of the system. Streak cameras will be used in phase 2 for measurement of the time-resolved spectrum with limited spectral coverage, which is sufficient to diagnose the time-resolved ion temperature. Simulations are presented that predict the performance of the streak camera detector, indicating that it will achieve excellent burn history measurements at current yields, and good time-resolved ion-temperature measurements at yields above 3 x 10(17). The PDDT will be used for optimal efficiency and resolution in phase 3. (c) 2022 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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