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Title: Plasma heating via adiabatic magnetic compression-expansion cycle

Abstract

Heating of collisionless plasmas in closed adiabatic magnetic cycle comprising of a quasi static compression followed by a non quasi static constrained expansion against a constant external pressure is proposed. Thermodynamic constraints are derived to show that the plasma always gains heat in cycles having at least one non quasi static process. The turbulent relaxation of the plasma to the equilibrium state at the end of the non quasi static expansion is discussed and verified via 1D Particle in Cell (PIC) simulations. Applications of this scheme to heating plasmas in open configurations (mirror machines) and closed configurations (tokamak, reverse field pinche) are discussed.

Authors:
 [1]; ;  [2]
  1. Department of Physics and Astrophysics, University of Delhi, Delhi 110007 (India)
  2. Institute for Plasma Research Bhat, Gandhinagar, Gujrat 382428 (India)
Publication Date:
OSTI Identifier:
22600122
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CLOSED CONFIGURATIONS; COLLISIONLESS PLASMA; COMPUTERIZED SIMULATION; EQUILIBRIUM; EXPANSION; HEAT; LIMITING VALUES; MAGNETIC COMPRESSION; MIRRORS; OPEN CONFIGURATIONS; PLASMA HEATING; RELAXATION; REVERSE-FIELD PINCH; THERMODYNAMIC PROPERTIES; TOKAMAK DEVICES

Citation Formats

Avinash, K., Sengupta, M., and Ganesh, R. Plasma heating via adiabatic magnetic compression-expansion cycle. United States: N. p., 2016. Web. doi:10.1063/1.4954305.
Avinash, K., Sengupta, M., & Ganesh, R. Plasma heating via adiabatic magnetic compression-expansion cycle. United States. doi:10.1063/1.4954305.
Avinash, K., Sengupta, M., and Ganesh, R. 2016. "Plasma heating via adiabatic magnetic compression-expansion cycle". United States. doi:10.1063/1.4954305.
@article{osti_22600122,
title = {Plasma heating via adiabatic magnetic compression-expansion cycle},
author = {Avinash, K. and Sengupta, M. and Ganesh, R.},
abstractNote = {Heating of collisionless plasmas in closed adiabatic magnetic cycle comprising of a quasi static compression followed by a non quasi static constrained expansion against a constant external pressure is proposed. Thermodynamic constraints are derived to show that the plasma always gains heat in cycles having at least one non quasi static process. The turbulent relaxation of the plasma to the equilibrium state at the end of the non quasi static expansion is discussed and verified via 1D Particle in Cell (PIC) simulations. Applications of this scheme to heating plasmas in open configurations (mirror machines) and closed configurations (tokamak, reverse field pinche) are discussed.},
doi = {10.1063/1.4954305},
journal = {Physics of Plasmas},
number = 6,
volume = 23,
place = {United States},
year = 2016,
month = 6
}
  • The production of nonthermal particles during the adiabatic magnetic compression of a fully ionized plasma is analyzed. Simple solutions of the kinetic equation are derived. These solutions agree with the results of numerical calculations. Some general relations regarding the behavior of the distribution function and its integral characteristics in the course of magnetic compression are derived.
  • Adiabatic plasma compression was effected in a tokamak-type installation by rapidly increasing the toroidal field. The energy lifetime in the compressed plasma is four times longer than in ohmic heating. The compression is accompanied by an abrupt attenuation of the oscillations in the plasma. (AIP)
  • The magnetic field produced by positive and negative pairs of straight line currents placed in a cylindrical configuration creates a magnetic bottle. After a pure plasma is produced inside the magnetic field configuration the current in the coils is increased to adiabatically compress the plasma by the magnetic barrier produced. A pure, highly compressed plasma is obtained with no trapped magnetic field inside. To avoid end losses the current carrying conductors creating the multipolar field must be brought together at the tube end in a configuration similar to the lines of force in a mirror machine. This cylindrical multipolar cuspmore » magnetic field should be useful in ion cyclotron plasma heating experiments to keep the hot plasma away from the wall and thus reduce the impurity levels. (C.E.S.)« less