On the axial heating of magnetically confined plasma with CO2 lasers

1977 ◽  
Vol 55 (21) ◽  
pp. 1868-1870
Author(s):  
C. S. Lai ◽  
M. P. Madan
Keyword(s):  
Magnetic Field ◽  
Plasma Column ◽  
Laser Intensity ◽  
Confinement Time ◽  
Co2 Lasers ◽  
Ion Heating ◽  
Magnetically Confined ◽  
Laser Heated

The equations governing the electron–ion heating in a CO2 laser heated plasma column confined by a solenoidal magnetic field are solved for a laser intensity law I = I0t2/3. It is shown that in addition to a set of solutions obtained by Offenberger, one more set of solutions exists, which is of considerable interest if shorter confinement time is desirable.

Axial heating of magnetically confined plasma with CO2 lasers

1977 ◽  
Vol 55 (5) ◽  
pp. 412-418 ◽  
Author(s):  
A. A. Offenberger
Keyword(s):  
Wave Propagation ◽  
Laser Intensity ◽  
Laser Energy ◽  
Ion Heating ◽  
Intensity Parameter ◽  
Order Unity ◽  
Ion Energy ◽  
Magnetically Confined ◽  
Laser Heated ◽  
Heating Wave

The coupled electron–ion heating equations, neglecting losses, in a CO2 laser heated solenoid are solved for a laser intensity varying with time as I = I0t2/3. An analytical solution, without restriction on the ratio of electron-to-ion temperatures Te/Ti is found, showing Te,i ~ t2/3.The heating wave which propagates along the solenoid is found to be supersonic having a velocity independent of time and varying as I03/5. Low intensity heating is found to maximize Ti/Te and minimize plasma length and laser energy requirements. The heating wave propagation is found to be consistent with an optical thickness of order unity in the heated plasma column. Considerations of electron–ion energy transfer, supersonic heating wave propagation, and laser beam trapping lead to an optimum laser intensity parameter [Formula: see text].

Stimulated Raman Backscatter from a Magnetically Confined Plasma Column

1982 ◽  
Vol 49 (6) ◽  
pp. 371-375 ◽  
Author(s):  
A. A. Offenberger ◽  
R. Fedosejevs ◽  
W. Tighe ◽  
W. Rozmus
Keyword(s):  
Plasma Column ◽  
Magnetically Confined ◽  
Raman Backscatter ◽  
Stimulated Raman

Untersuchung des Druckaufbaus einer stationären, magnetfeldstabilisierten Helium-Entladung mit Hilfe magnetischer Messungen

1967 ◽  
Vol 22 (10) ◽  
pp. 1599-1612 ◽  
Author(s):  
Otto Klüber
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Plasma Column ◽  
Ambipolar Diffusion ◽  
Nernst Effect ◽  
Thermomagnetic Effect ◽  
Field Coil ◽  
Neutral Gas ◽  
Ring Currents ◽  
The Magnetic Field

A stationary discharge is produced bya current flowing parallel to the magnetic field ofa cylindrical coil. In the region where the field is homogeneous the pressure in the plasma column is much higher than that in the surrounding neutral gas. This is mainly caused by diamagnetic ring currents, as is shown by measuring the magnetic flux due to these currents. Two effects are primarily responsible for the ring currents in this region: The already known effect of the ambipolar diffusion across the magnetic field anda thermomagnetic effect, called NERNST effect, whose influence on the pressure build-up ofa plasma has not been investigated hitherto. Other phenomena causing ring currents occur in the plasma near the coil ends and outside the field coil.

scholarly journals Current Systems in Radio Jets

1985 ◽  
Vol 107 ◽  
pp. 433-437
Author(s):  
Jean A. Eilek
Keyword(s):  
Magnetic Field ◽  
Surface Brightness ◽  
Field Structure ◽  
Free Expansion ◽  
Radio Jets ◽  
Recent Interest ◽  
Magnetically Confined ◽  
Show Evidence ◽  
Current Systems ◽  
The Magnetic Field

The structure of the magnetic field in radio jets is a topic of recent interest, especially due to the possibility that some high pressure jets are confined by a magnetic pinch. Several such jets have been found which cannot be confined by external cluster gas pressure, on which there are observational limits; nor can they be in free expansion, since they do not show evidence of adiabatic expansion losses. Recent radio interferometer observations of surface brightness and polarization allow the possibility of determining the magnetic field structure. In this paper I present some basic considerations of the current and field structure required if the observed jets are to be magnetically confined.

scholarly journals Laser intensity scaling of the magnetic field from a laser-driven coil target

2020 ◽  
Vol 127 (8) ◽  
pp. 083302
Author(s):  
G. J. Williams ◽  
S. Patankar ◽  
D. A. Mariscal ◽  
V. T. Tikhonchuk ◽  
J. D. Bude ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Laser Intensity ◽  
The Magnetic Field ◽  
Intensity Scaling

Ion beam excitation of ion-cyclotron waves and ion heating in plasmas with drifting ions

1978 ◽  
Vol 19 (2) ◽  
pp. 237-252 ◽  
Author(s):  
J. P. Hauck ◽  
H. Böhmer ◽  
N. Rynn ◽  
Gregory Benford
Keyword(s):  
Magnetic Field ◽  
Ion Beam ◽  
Ion Beams ◽  
Ion Heating ◽  
Ion Cyclotron Waves ◽  
Diffusion Effects ◽  
Ion Cyclotron ◽  
Cyclotron Mode ◽  
The Magnetic Field ◽  
Beam Excitation

Ion-cyclotron waves are excited by cesium and potassium ion beams in cesium and potassium Q-machine plasmas. The ion beams are injected along the magnetic field with care to avoid beam transverse velocities. The observed ion-cyclotron mode frequencies are below those driven by electron currents. These resonant instabilities are convective in character with small spatial growth rates ki/kr ≃ 0.05. Plasma ion heating is observed and is consistent with a model in which mode amplitudes are saturated by diffusion effects.

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