學術演講‎ > ‎

<專題討論>2017/9/21(四)14:10綜合大樓2樓48218教室演講「Fusion in a Staged Z-Pinch」( Dr. Frank J. Wessel / Magneto-Inertial Fusion Technologies, Inc., Tustin, CA, USA )

張貼者:2017年9月28日 下午11:40Dabby Lu   [ 已更新 2017年10月12日 下午7:04 ]

Abstract.  The Staged Z-pinch is a fusion concept involving the implosion of a high-atomic-number liner onto a pre-magnetized, fusible-target plasma. The concept emerged from liner-driven, flux-compression experiments, wherein a fiber optic, coaxial with the pinch, was used to measure the magnetic-field intensity. Current induced on the fiber’s exterior was observed to couple a pressure impulse that caused the fiber to become birefringent and loose signal [1]. The resulting generalized description for the SZP included azimuthal- and axial-magnetic fields and induction-current amplification, providing a means to confine and adiabatically heat a target in a step-wise manner [2]. Laser Schlieren imaging of the SZP indicates that even though the liner’s outer surface becomes Rayleigh Taylor unstable, the liner-target interface remains stable until peak compression. The interface stability is accounted for as a shock-front piston [3]. We have investigated its formation and energy coupling as a function of liner-atomic mass [4]. High-atomic number is preferred, leading to a high-energy-density target plasma with fusion products confined in a magnetic well [5]. Recent SZP experiments, designed to investigate these effects, were conducted at the University of Nevada, Reno and Cornell University, on 1 MA, 100 ns pulsers. Data indicate that the SZP is more stable when a target is present, leading to the production of primary (DD) and secondary neutron yields (DT), of thermonuclear origin, as seen in previous experiments [6]. Design refinements to the SZP consider the use of tailored mass profiles to increase the interface pressure and target acceleration [7]. This talk provides a comprehensive summary of the SZP experimental, theoretical, and computational results.

ą
海報.jpg
(658k)
Dabby Lu,
2017年9月28日 下午11:40
Comments