JET-C(98)22

Routes to Ignition on ITER by means of Neutral Beams

The aim of this work is to assess the effect of Neutral Beams on ITER, principally in terms of the ability to ignite the plasma using Neutral Beam Injection (NBI). Previous work on Neutral Beams for ITER [1] modelled ITER using Rebut-Lallia-Watkins (RLW) transport [2] without taking the effect of an H-mode threshold power (PLÆH) into account. The present work does use the LÆH transition, models the ELMs explicitly and uses the JET transport model by Erba et al [3]. In this JET model, transport is split between a GyroBohm term (which is purely local) and a Bohm term which depends on the edge temperature. The model is implemented in the JET version of the 1_-D predictive PRETOR code [1,4] which is used to explore the route to ignition on ITER by NBI. Various beam energies are considered and the plasma rotation resulting from the momentum input of the beams is described. A complete description of this work is in [5].
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JETC98022 59.61 Kb