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Ignition and Fueling Scenario Calculations for Neutral-Beam-Heated Tokamak Reactors Based on Pellet Injection

Lajos L. Lengyel

Fusion Science and Technology / Volume 10 / Number 3P1 / Pages 354-363

November 1986


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Results of ignition and continuous fueling scenario calculations are presented that were obtained in the framework of an assessment performed f or the Next European Torus based on International Tokamak Reactor (INTOR) parameters. The results obtained with pellet injection are compared with results corresponding to gas puffing. Pellet injection transports fresh fuel to the reaction zone on a time scale that is much shorter than the diffusion time characterizing the gas puffing method, thus making the method flexible and readily adaptable to different situations. In the case of ignition by pellet injection, it may become possible to have deep neutral beam penetration and maintain favorable heat deposition profiles up to the moment of density ramp-up, thus substantially relaxing beam output requirements. Three beam energies (D0particles) have been considered: 120, 100, and 80 keV. The importance of a proper match between beam characteristics and pellet parameters, specific for the transport scaling assumed (Alcator-INTOR), is shown. In the case of continuous fueling o f an already ignited discharge, the alpha power production notably increases if repetitive pellet injection, instead of gas puffing, is applied. The advantages of pellet injection are substantial, even at moderate pellet velocities.

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