MegaJOuLe Neutron Imaging Radiography (MJOLNIR) Dense Plasma Focus Rebuild and High Current Experiments

被引：1

作者：

Schmidt, A. ^{[1
]}

Anaya, E. ^{[1
]}

Anderson, M. ^{[1
]}

Angus, J. ^{[1
]}

Campbell, P. C. ^{[1
,2
]}

Chapman, S. F. ^{[1
]}

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

Drury, O. B. ^{[1
]}

Frausto, L. ^{[1
]}

Goyon, C. ^{[1
]}

Jiang, S. ^{[1
]}

Jibodu, A. ^{[1
,3
]}

Koh, E. ^{[1
]}

Link, A. ^{[1
,4
]}

Max, D. ^{[5
]}

Park, J. ^{[1
]}

Rocco, S. R. ^{[1
]}

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

Youmans, A. E. ^{[1
]}

机构：

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

[2] Zap Energy, Everett, WA 98203 USA

[3] Stanford Univ, Stanford, CA 94305 USA

[4] Pacific Fusion, Fremont, CA 94538 USA

[5] Natl Nucl Secur Site Livermore Off, Livermore, CA 94550 USA

来源：

IEEE TRANSACTIONS ON PLASMA SCIENCE | 2024年 / 52卷 / 10期

关键词：

Anodes; Neutrons; Plasmas; Insulators; Energy storage; Discharges (electric); Cathodes; Radiography; Fault location; Fasteners; Dense plasma focus (DPFs); neutron sources; neutrons; nuclear imaging; plasma devices; plasma diagnostics; plasma pinches; plasma simulation; pulse power systems; radiography; z-pinch; PULSED-POWER; YIELD; 1ST;

D O I：

10.1109/TPS.2024.3382229

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

A dense plasma focus (DPF) is a co-axial plasma railgun, whose discharge ends in a z-pinch phase. The MegaJOuLe neutron imaging radiography (MJOLNIR) DPF is a Lawrence Livermore National Laboratory (LLNL) experiment to demonstrate feasibility of flash neutron radiography using the DPF as a neutron source and a neutron camera to record an image. The MJOLNIR team is in the process of commissioning the DPF to full stored energy and current, 2 MJ/4.5 MA, with 1.3-MJ stored energy and 3.8-MA peak currents achieved as of October 2023. A recent redesign/rebuild of the MJOLNIR DPF has enabled robust operations, supporting >900 high voltage/plasma shots, 570+ on a single hardware setup, over the course of 11 months. Neutron yields in excess of 1 x 10(12) have been achieved on the highest current shots with deuterium gas fill. Successful high current operation requires interleaving of high current shots with lower current (similar to 2.8-MA peak) shots. Neutron spot sizes have been measured as a function of voltage, pressure, anode implosion radius, and gas dopant levels. We document an overview of the MJOLNIR redesign and highcurrent experimental results.

引用

页码：4906 / 4915

页数：10

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