Abstract
A set of six equations governing plasma parameters (hydrogen ion density, impurity ion density, electron temperature, and ion temperature) within the burial chamber of a bundle divertor and the potential steps in the divertor throat and in front of the divertor plate is presented. Secondary electron emission at the divertor plate, the particle and energy flow reduction due to the mirror, and the backflow of impurities into the scrape-off plasma are taken into account. The modelling is based mainly on the assumption that strong relaxation processes due to the microinstabilities arising because of the mirror and the secondary emission decrease the deviations from a Maxwellian distribution function to a negligible level in both the scrape-off region and the divertor chamber. Particle sink and energy loss terms due to the divertor are derived suited for 1-D transport code calculations. In this way, the plasma parameters in the scrape-off region can be calculated consistently to those of the central core and of the divertor chamber.
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