Pinch modes produced in the SPEED2 plasma focus

Abstract

Deuterium discharges in the SPEED2 plasma focus doped with heavy gases (e.g. neon, argon) produce two pinch modes, the micropinch mode (MPM) or the stable column mode (SCM), with a transition regime where the initial SCM is followed by the MPM. Micropinches are local radiative collapses initiated by instabilities (m = 0 type) of low-energy-density pinch plasmas. These instabilities and the successive micropinches can be suppressed by kinetic deuterons produced during dynamical compression of high-energy-density deuterium plasma sheaths. Depending on the relaxation of this fast deuteron component the pinch column can be stabilized for several tens of nanoseconds. The SCM optimized with respect to the compression ratio is a powerful linear radiation source of high density (up to 10 27 m −3 ) and temperature (up to 1 keV).

Structural, compositional and hardness properties of hydrogenated amorphous carbon nitride thin films synthesized by dense plasma focus device

“…The micro instabilities such as sausage instabilities ( m = 0) starts to grow in this pinched plasma column during the final focus phase results in the induced electric field enhanced locally. Hence, the pinched plasma column breaks and the ions and electrons beams are produced that are accelerated in the opposite directions . Bhuyan et al .…”

Synthesis of composite TiN/Ni3N/a-Si3N4thin films using the plasma focus device

“…The plasma temperature becomes high enough to cause the complete ionization of the filling gas species. This is the instance where Sausage instabilities (m = 0) are seen to set in the focused plasma column which enhances induced electric field locally (22). This enhanced electric field, coupled with magnetic field, breaks the focused plasma column by accelerating nitrogen ions to very high energy (∼2 Mev) toward the top of the chamber and electrons of relativistic energies (100 Kev or above) toward the positively charged anode (23).…”

Structural, Morphological and Mechanical Characterisation of Molybdenum Nitride Thin Films Deposited by a Plasma Focus Device

“…Creation of a pinched plasma column is subsequently followed by sausage instability (m = 0) in the cylindrical plasma column, which increases the induced electric field locally, which couples with the magnetic field, leading to the disruption of the plasma column. 44 The plasma disruption leads to the acceleration of very high-energy ions towards the top of the chamber and relativistic electrons towards the central electrode. These relativistic electrons cause plasma ablation from the central electrode that has the molybdenum ions required for MoN formation.…”