Control of particles distribution functions by magnetic field in helicon plasma discharge

2015 ◽  
Author(s):  
T. Huang ◽  
C. Jin ◽  
J. Yu ◽  
L. Zhuge ◽  
X. Wu
Keyword(s):  
Magnetic Field ◽  
Plasma Discharge ◽  
Distribution Functions ◽  
Helicon Plasma

Helicon Plasma Discharge in a Toroidal Magnetic Field of the Tokamak

2011 ◽  
Vol 39 (11) ◽  
pp. 3103-3107 ◽  
Author(s):  
C. G. Jin ◽  
T. Yu ◽  
Y. Zhao ◽  
Y. Bo ◽  
C. Ye ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Plasma Discharge ◽  
Toroidal Magnetic Field ◽  
Helicon Plasma

Low-Pressure Helicon-Plasma Discharge Initiation via Magnetic Field Ramping

2009 ◽  
Vol 37 (11) ◽  
pp. 2110-2115 ◽  
Author(s):  
M. Wiebold ◽  
He Ren ◽  
C.M. Denning ◽  
J.E. Scharer
Keyword(s):  
Magnetic Field ◽  
Low Pressure ◽  
Plasma Discharge ◽  
Helicon Plasma

A GENERALIZED VARIATIONAL PRINCIPLE FOR TRANSPORT PHENOMENA

1958 ◽  
Vol 36 (10) ◽  
pp. 1308-1318 ◽  
Author(s):  
G. E. Tauber
Keyword(s):  
Magnetic Field ◽  
Variational Principle ◽  
Ritz Method ◽  
Transport Coefficients ◽  
Distribution Functions ◽  
Generalized Variational Principle ◽  
Lattice Vibrations ◽  
Arbitrary Direction ◽  
Energy Surfaces ◽  
Thermomagnetic Phenomena

A generalized variational principle has been formulated which takes the phonon distribution functions and the external magnetic field into account, is valid for an arbitrary direction of the electric field and polarization of the lattice vibrations, and does not depend on any special form of the energy surfaces. The various transport coefficients, for both thermoelectric and thermomagnetic phenomena, are obtained by the Ritz method in terms of infinite determinants without requiring an explicit solution of the transport equations.

scholarly journals Diffusion at the Earth magnetopause: enhancement by Kelvin-Helmholtz instability

2007 ◽  
Vol 25 (1) ◽  
pp. 271-282 ◽  
Author(s):  
R. Smets ◽  
G. Belmont ◽  
D. Delcourt ◽  
L. Rezeau
Keyword(s):  
Magnetic Field ◽  
Distribution Functions ◽  
Larmor Radius ◽  
Simple Analytical Model ◽  
Helmholtz Instability ◽  
Field Reversal ◽  
Finite Larmor Radius ◽  
The Earth ◽  
Specific Distribution ◽  
The Magnetic Field

Abstract. Using hybrid simulations, we examine how particles can diffuse across the Earth's magnetopause because of finite Larmor radius effects. We focus on tangential discontinuities and consider a reversal of the magnetic field that closely models the magnetopause under southward interplanetary magnetic field. When the Larmor radius is on the order of the field reversal thickness, we show that particles can cross the discontinuity. We also show that with a realistic initial shear flow, a Kelvin-Helmholtz instability develops that increases the efficiency of the crossing process. We investigate the distribution functions of the transmitted ions and demonstrate that they are structured according to a D-shape. It accordingly appears that magnetic reconnection at the magnetopause is not the only process that leads to such specific distribution functions. A simple analytical model that describes the built-up of these functions is proposed.

Transport of a helicon plasma by a convergent magnetic field for high speed and compact plasma etching

2014 ◽  
Vol 47 (42) ◽  
pp. 425201 ◽  
Author(s):  
Kazunori Takahashi ◽  
Taisei Motomura ◽  
Akira Ando ◽  
Yuji Kasashima ◽  
Kazuya Kikunaga ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Plasma Etching ◽  
High Speed ◽  
Helicon Plasma

Tsallis Distribution Functions in the Solar Wind: Magnetic Field and Velocity Observations

2007 ◽  
Author(s):  
Leonard F. Burlaga ◽  
Adolfo F. Viñas ◽  
Sumiyoshi Abe ◽  
Hans Herrmann ◽  
Piero Quarati ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Distribution Functions ◽  
Solar Wind Magnetic Field ◽  
Tsallis Distribution

scholarly journals Studies of the helicon plasma source with inhomogeneous magnetic field

2016 ◽  
Author(s):  
I. V. Shikhvotsev ◽  
V. I. Davydenko ◽  
A. A. Ivanov ◽  
I. A. Kotelnikov ◽  
E. I. Kuzmin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Plasma Source ◽  
Inhomogeneous Magnetic Field ◽  
Helicon Plasma

Formation of non-thermal electron velocity distribution functions in kinetic magnetic reconnection

2021 ◽  
Author(s):  
Xin Yao ◽  
Patricio A. Muñoz ◽  
Jörg Büchner
Keyword(s):  
Magnetic Field ◽  
Free Energy ◽  
Field Strength ◽  
Magnetic Reconnection ◽  
Electron Beams ◽  
Distribution Functions ◽  
Electron Velocity ◽  
Diffusion Region ◽  
Electron Velocity Distribution ◽  
Velocity Distribution Functions

<div> <div>Magnetic reconnection can convert magnetic energy into non-thermal particle energy in the form of electron beams. Those accelerated electrons can, in turn, cause radio emission in environments such as solar flares. The actual properties of those electron velocity distribution functions (EVDFs) generated by reconnection are still not well understood. In particular the properties that are relevant for the micro-instabilities responsible for radio emission. We aim thus at characterizing the electron distributions functions generated by 3D magnetic reconnection by means of fully kinetic particle-in-cell (PIC) code simulations. Our goal is to characterize the possible sources of free energy of the generated EVDFs in dependence on an external (guide) magnetic field strength. We find that: (1) electron beams with positive gradients in their parallel (to the local magnetic field direction) distribution functions are observed in both diffusion region (parallel crescent-shaped EVDFs) and separatrices (bump-on-tail EVDFs). These non-thermal EVDFs cause counterstreaming and bump-on-tail instabilities. These electrons are adiabatic and preferentially accelerated by a parallel electric field in regions where the magnetic moment is conserved. (2) electron beams with positive gradients in their perpendicular distribution functions are observed in regions with weak magnetic field strength near the current sheet midplane. The characteristic crescent-shaped EVDFs (in perpendicular velocity space) are observed in the diffusion region. These non-thermal EVDFs can cause electron cyclotron maser instabilities. These non-thermal electrons in perpendicular velocity space are mainly non-adiabatic. Their EVDFs are attributed to electrons experiencing an E×B drift and meandering motion. (3) As the guide field strength increases, the number of locations in the current sheet with distributions functions featuring a perpendicular source of free energy significantly decreases.</div> </div>

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