THE EFFECT OF AN ACCOMPANYING MAGNETIC FIELD ON ELECTRON COOLING

Abstract

We consider the cooling of a beam of heavy particles in an accompanying electron flux "frozen" by a longitudinal magnetic field.The velocity distribution of electrons is assumed to be sharply flattened in the longitudinal direction (~e II ~~eJJ.Under these conditions in the region ~i < ~e 1 (where ~i is the ion velocity spread) the effective temperature of the electrons is determined by the longitudinal spread of their velocities because of the long-range character of Coulomb forces and because the transverse motion of electrons is magnetized.In this case, the cooling rate increases rapidly compared with the case ~ell '" ~e.L and the ion temperature may be decreased down to the level of the longitudinal temperature of the electrons.It is shown that under certain conditions this effect is reduced by deviations of the magnetic-field force lines from the closed-orbit direction in the cooling region.