Interaction of Heavy Ion Beams with Plasma Electrons: Role of Many-Electron Ionization Processes

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Abstract

Processes of multiple electron-impact ionization of ions in a plasma and a beam passing through the plasma have been considered. Using experimental data and theoretical calculations of the cross sections for n-electron ionization 
, the contribution from many-electron ionization rates 
 to the total ionization rate has been determined as a function of the electron temperature of the plasma T. It has been shown that the total contribution of many-electron ionization rates to the total ionization rate in ion beams passing through the plasma is determined by the relation between the velocity of an ion beam 
 and the thermal velocity of electrons in the plasma 
. Many-electron ionization rates 
 have been numerically calculated for W+ ions for electron temperatures of the plasma from 1 eV to 10 keV and velocities of the ion beam 
 = 0–30 a.u., where 1 a.u. ≈ 2.2 × 108 cm/s is the atomic unit of velocity.

About the authors

G. I Andreev

Department of Physical Electronics, Faculty of Physics, Moscow State University

Email: shevelkovp@lebedev.ru
119991, Moscow, Russia

V. L Bychkov

Department of Physical Electronics, Faculty of Physics, Moscow State University

Email: shevelkovp@lebedev.ru
119991, Moscow, Russia

V. P Shevel'ko

Lebedev Physical Institute, Russian Academy of Sciences

Author for correspondence.
Email: shevelkovp@lebedev.ru
119991, Moscow, Russia

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