Rotational instability in a linear theta pinch

1980 ◽  
Vol 23 (9) ◽  
pp. 1832 ◽  
Author(s):  
C. Ekdahl ◽  
R. R. Bartsch ◽  
R. J. Commisso ◽  
R. F. Gribble ◽  
K. F. McKenna ◽  
...  
Keyword(s):  
Rotational Instability ◽  
Theta Pinch

End effects on the n = 2 rotational instability in the reversed-field theta-pinch

1982 ◽  
Vol 22 (6) ◽  
pp. 843-847 ◽  
Author(s):  
Y. Aso ◽  
Ch. Wu ◽  
S. Himeno ◽  
K. Hirano
Keyword(s):  
Rotational Instability ◽  
End Effects ◽  
Theta Pinch ◽  
Reversed Field

Plasma losses through an adiabatic cusp

1974 ◽  
Vol 11 (1) ◽  
pp. 77-91 ◽  
Author(s):  
A. S. Kaye
Keyword(s):  
Angular Momentum ◽  
Energy Loss ◽  
Electric Fields ◽  
Loss Rate ◽  
Particle Energy ◽  
Rotational Instability ◽  
Absolute Value ◽  
Theta Pinch ◽  
Maxwellian Plasma ◽  
Plasma Radius

Previous calculations of β = 1 cusp losses are extended to the case where there exists a third ‘adiabatic’ invariant of the particle motion, related to the magnetic moment, and additional to the particle energy and angular momentum. Simple analytic results are obtained for the particle and energy loss rate from a Maxwellian plasma in both plane and axisymmetric geometry, electric fields being assumed zero everywhere. The results are valid for a plasma radius large relative to the ion gyro-radius, in which case the adiabaticity in the sense used reduces the loss rate by a factor ⅔λ⅔ to give an overall scaling as λ–⅔ with external mirror ratio λ. The absolute value is about a factor two less than the previously accepted result (for λ = 1 only) for an axisymmetric cusp. cusp. The enhanced scaling with A arises from the absence of a certain class of particles in the sheath, which must be everywhere adiabatic; its applicability to a simple theta pinch is queried, however. The end loss rate of angular momentum is also obtained, and is non-zero at a point cusp. This is shown to lead to rapid rotational instability in a collisionless theta pinch.

Rotational Instability in the Theta Pinch

1963 ◽  
Vol 6 (9) ◽  
pp. 1338 ◽  
Author(s):  
H. A. B. Bodin ◽  
A. A. Newton
Keyword(s):  
Rotational Instability ◽  
Theta Pinch

Magnetic probe measurments on a Theta pinch discharge

1962 ◽  
Vol 9 (2) ◽  
pp. 148-166
Author(s):  
Izumi Hayashi ◽  
Yoshibumi Senoo
Keyword(s):  
Magnetic Probe ◽  
Theta Pinch

scholarly journals New Transition and Energy Levels of Three-Times Ionized Krypton (Kr IV)

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 48
Author(s):  
M. Raineri ◽  
M. Gallardo ◽  
J. Reyna Almandos ◽  
A. G. Trigueiros ◽  
C. J. B. Pagan
Keyword(s):  
Transition Probabilities ◽  
Energy Levels ◽  
Pulsed Discharge ◽  
Core Polarization ◽  
Polarization Effects ◽  
Hartree Fock ◽  
Theta Pinch ◽  
New Energy ◽  
First Time

A capillary pulsed-discharge and a theta-pinch were used to record Kr spectra in the region of 330–4800 Å. A set of 168 transitions of these spectra were classified for the first time. We extended the analysis to twenty-five new energy levels belonging to 3s23p24d, 3s23p25d even configurations. We calculated weighted transition probabilities (gA) for all of the experimentally observed lines and lifetimes for new energy levels using a relativistic Hartree–Fock method, including core-polarization effects.

Preliminary Results on Electron Acceleration Mechanism in the Slow Theta Pinch

1964 ◽  
Vol 19 (7) ◽  
pp. 1244-1245 ◽  
Author(s):  
Kazuo Sato ◽  
Haruyuki Ohnishi ◽  
Hisamitsu Yoshimura
Keyword(s):  
Electron Acceleration ◽  
Preliminary Results ◽  
Acceleration Mechanism ◽  
Theta Pinch

scholarly journals Die zeitliche Änderung der radialen Elektronendichteverteilung beim Theta-Pinch

1963 ◽  
Vol 18 (8-9) ◽  
pp. 895-900
Author(s):  
Franz Peter Küpper
Keyword(s):  
Density Distribution ◽  
Electron Density ◽  
Electron Density Distribution ◽  
Electron Distribution ◽  
Radial Symmetry ◽  
Zero Order ◽  
Time Interval ◽  
Interferometric Method ◽  
Density Distributions ◽  
Theta Pinch

In a θ-pinch the radial symmetry of the electron density distribution as a function of time has been measured by a MACH—ZEHNDER interferometer. In a time interval of 400 nsec during a discharge an image converter made three pictures (exposure times of 10 nsec each) . Up to 100 nsec after the first compression, the experimental results show different density distributions for the cases of trapped parallel and antiparallel magnetic fields. Complete radial symmetry of the electron density distribution was not found.Another interferometric method for measuring the radial symmetry of the electron distribution by observing “zero order” fringes is described.

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