Laserbeam propagation in a long solenoid
Abstract
An analysis of the propagation of a laser beam in a cylindrical magnetically confined plasma with parabolic density profile is presented. The normal modes which are selftrapped are given. It is found that the largest mode that can be trapped by the plasma is given by (1/2)(Rsquared/wsquared1) where R is the radius of the plasma column and w is the fundamental mode width. It is found that all the trapped modes in a finite plasma can easily propagate distances of the order of one kilometer. An exact solution for the amplitude of the electric field for an incident Gaussian beam has been obtained. The solution exhibits alternate focusing and defocusing of the beam. The effect of this on the plasma heating is discussed.
 Publication:

Nuclear Fusion
 Pub Date:
 June 1975
 Bibcode:
 1975NucFu..15..371M
 Keywords:

 Laser Beams;
 Laser Heating;
 Light Transmission;
 Magnetic Control;
 Plasma Heating;
 Propagation Modes;
 Solenoids;
 Coherent Light;
 Defocusing;
 Focusing;
 Plasma Control;
 Plasma Cylinders;
 PlasmaElectromagnetic Interaction;
 Plasmaguides;
 Lasers and Masers