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 e nergy distribution function of electrons in the source plasma. Three compon ents of electrons are introduced to describe the electron energy distributi on 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 a nd bremsstrahlung emission in the afterglow mode of ECR source operation. T he multicomponent consideration of electrons Mi the ECR plasma is applied t o explain physically and to simulate numerically the effect of long bremsst rahlung (100-300 ms) in the afterglow regime that was discovered recently i n the ECR source at RIKEN.