Formation of tight plasma pinches and generation of high-power soft x-ray radiation pulses in fast Z-pinch implosions

Effects of a Preembedded Axial Magnetic Field on the Current Distribution in a Z -Pinch Implosion

“…(ii) A very small B z0 = 0.28 T relative to the B θ generated by the discharge current, practically eliminates the x-ray yield in the experiment on the 2.5-MA GIT-12 generator [11].…”

“…Recently, this subject has gained particular interest due to the advances in producing plasmas of high temperature and density for fusion purposes, based on the approach of magnetized plasma compression [3,6]. These advances follow three decades of experimental [7][8][9][10][11][12][13][14][15] and theoretical [16,17] research. Some of the magnetized-plasma implosion experiments [7,8,11,[18][19][20][21] reveal new and unpredicted phenomena, yet to be fully understood, which dramatically differ from those observed in implosion experiments without preembedded axial magnetic field.…”

“…Some of the magnetized-plasma implosion experiments [7,8,11,[18][19][20][21] reveal new and unpredicted phenomena, yet to be fully understood, which dramatically differ from those observed in implosion experiments without preembedded axial magnetic field. These include significant changes in the plasma dynamics and radiation emission properties, specifically, (i) the formation of helical structures [18,19], (ii) larger than predicted implosion time and plasma radius at stagnation [19][20][21] accompanied by strong mitigation of instabilities [11,19], and (iii) reduction of the continuum [7,8] and K-shell emission [11]. In order to advance the concept of magnetized plasma compression, it is essential to understand the governing mechanisms of these phenomena.…”

Stable and unstable supersonic stagnation of an axisymmetric rotating magnetized plasma

“…In many cases, an external axial magnetic field is applied to stabilize the implosion or provide the 'magneto-thermo-insulation' (Lindemuth & Kirkpatrick 1983) of the stagnated plasma, which is the critical issue for all approaches to magnetized target fusion and magneto-inertial fusion (Turchi 2008;Garanin 2013;Wurden et al 2016;Lindemuth 2017), including the MagLIF. The axial magnetic field, in turn, can affect the implosion dynamics in various ways, not all of which are fully understood; see Felber et al (1988), Shishlov et al (2006), Rousskikh et al (2017), Mikitchuk et al (2019), Conti et al (2020), Seyler (2020) and references therein. Recent experiments with gas-puff Z-pinch implosions in an external magnetic field (Cvejić et al 2022) demonstrated a self-generated rotation of the imploding axisymmetric plasma.…”

Application of one-dimensional stagnation solutions to three-dimensional simulation of compact wire array in absence of radiation

“…Although this work focuses on 3D stagnation of wire arrays, our results may be relevant to gas puffs [43][44][45][46][47][48][49] and metallic liners, 50,51 which also develop 3D structures during the implosion phase. Furthermore, recent simulations 52 highlight the important role that 3D hydrodynamics may play during stagnation of inertial confinement fusion capsules.…”