Inductively coupled 30 T magnetic field platform for magnetized high-energy-density plasma studies

Abstract

A pulsed high magnetic field device based on the inductively coupled coil concept [D. H. Barnak , Rev. Sci. Instrum., 033501 (2018)] is described. The device can be used for studying magnetized high-energy-density plasma and is capable of producing a pulsed magnetic field of 30 T inside a single-turn coil with an inner diameter of 6.5 mm and a length of 6.3 mm. The magnetic field is created by discharging a high-voltage capacitor through a multi-turn solenoid, which is inductively coupled to a small single-turn coil. The solenoid electric current pulse of tens of kA and a duration of several s is inductively transformed to hundreds of kA in the single-turn coil, thus enabling a high magnetic field. Unlike directly driven single-turn systems that require a high-current and low-inductive power supply, the inductively coupled system operates using a relatively low-current power supply with very relaxed requirements for its inductance. This arrangement significantly simplifies the design of the power supply and also makes it possible to place the power supply at a significant distance from the coil. In addition, the device is designed to contain possible wire debris, which makes it attractive for debris-sensitive applications.

Enhanced X-ray emission arising from laser-plasma confinement by a strong transverse magnetic field

“…The investigation of the dynamics of strongly magnetized high-energy-density (HED) plasmas is a topic that has been recently the subject of significant effort by many groups. Permitted by the advent of new experimental facilities capable of developing strong magnetic fields [1][2][3], such investigations have led to major progress in diverse fields such as laboratory astrophysics [4][5][6][7][8][9][10][11] or inertial confinement fusion (ICF). In ICF, it has been realized that, by constraining the ion trajectories in the compressed core, and thus increasing their collision rate, magnetization increases the fuel ion temperature [12].…”

Confinement of relativistic electrons in a magnetic mirror en route to a magnetized relativistic pair plasma

“…22 While initially trapped particles exhibiting non-adiabaticity can move into the loss cone and escape, they can remain trapped for several bounce periods. The magneto-inertial fusion discharge system (MIFEDS) [31][32][33][34] at the Omega EP short pulse laser facility can store $500 J. This is enough to produce a 13 T magnetic field at the center of two 10 mm coils spaced 14 mm apart with a 28 kA current pulse lasting ls.…”

A new frontier in laboratory physics: magnetized electron–positron plasmas

“…In addition, utilizing such laser-driven coils would necessitate using two short-pulse lasers, one for positron generation and one for the coil, introducing complexities in aligning the pulses and potential laser crosstalk. Recently developed, inductively coupled, pulsed-power driven coils can generate up to 30 T for microseconds (Barnak et al 2018;Fiksel et al 2018;Shapovalov et al 2019). Although these pulsed-power driven coils have an order of magnitude weaker magnetic fields, the physics of pulsed power circuits is well understood and the fields are steady-state over the targeted plasma lifetime.…”