Numerical simulation of the bremsstrahlung emission from ECR source in afterglow mode

The effectiveness of highly charged ion production and X-ray bremsstrahlung in an electron-cyclotron resonance (ECR) ion source is determined by the energy distribution function of electrons in the source plasma. Three components of electrons are introduced to describe the electron energy distribution in ECR plasma. The new model and equations were used in a new version of computer codes for numerical simulation of highly charged ion production and bremsstrahlung emission in the afterglow mode of ECR source operation. The multicomponent consideration of electrons in the ECR plasma is applied to explain physically and to simulate numerically the effect of long bremsstrahlung (100-300 ms) in the afterglow regime that was discovered recently in the ECR source at RIKEN. (orig.)