Transport of Fusion Alpha Particles in ITER Scenarios
Abstract
We predict the fusion-born alpha particle density in steady-state and hybrid (reverse shear) ITER scenarios with an integrated 1D transport model. The model combines ``stiff'' critical gradient alpha-driven Alfvén eigenmode (AE) transport with a quasilinear approximation of microturbulent transport. In an ITER baseline case, AE transport is found to redistribute alphas within the core but not propagate to the loss boundary. The remaining microturbulence at the edge causes negligible alpha-channel energy flux there (neglecting ripple loss). We set the AE stiff transport critical gradient threshold at gAE =gITG , below which microturbulence can nonlinearly suppress AE transport, and the more stringent condition gAE = 0 .
Work supported in part by the US DOE under GA-Grant No. DE-FG02-95ER54309 and SciDAC-GSEP Grant No DE-FC02-08ER54977.- Publication:
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APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- October 2014
- Bibcode:
- 2014APS..DPPNP8014B