Abstract
The paper represents results of predictive 3D Fokker–Planck modelling of phase space distributions of fusion alpha particles for basic ITER scenarios (Polevoi et al. in J Plasma Fusion Res Ser 5:82, 2002). We simulate the poloidal profiles of alpha induced current as well as of the fusion power deposition to bulk plasma electrons. It is demonstrated that anisotropy of velocity distributions of alphas results in a rather strong alpha driven current that makes up about 10–15 % of the equilibrium plasma current density in the 4th ITER scenario. We investigate the impact of the alpha driven current on the ITER magnetic configuration. In the 4th scenario fusion alphas are shown to result in ~15 % enhancement of the rotational transform and in ~11 % enlargement of the Shafranov shift of magnetic flux surfaces. Also we evaluate the capability of gamma diagnostics of high-energy alphas in ITER and examine the collisional losses of fusion alpha particles.
Highlights
In comparison to the effect of charged fusion products (CFPs) in current tokamaks, CFPs in ITER are expected, due to the significantly enhanced fusion power, to have a stronger impact both on the plasma as well as on the first wall
We evaluate the capability of gamma diagnostics of high-energy alphas in ITER and examine the collisional losses of fusion alpha particles
The simulation carried out is based on the 3D in constantsof-motion space Fokker–Planck approach previously used for modeling CFPs in TFTR [3–6] and JET [7, 8] as well as for NBI ions in JET [9, 10] and ITER [11]
Summary
In comparison to the effect of charged fusion products (CFPs) in current tokamaks, CFPs in ITER are expected, due to the significantly enhanced fusion power, to have a stronger impact both on the plasma as well as on the first wall. It is demonstrated that anisotropy of velocity distributions of alphas results in a rather strong alpha driven current that makes up about 10–15 % of the equilibrium plasma current density in the 4th ITER scenario.
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