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Overview of transport, fast particle and heating and current drive physics using tritium in JET plasmas
- Stork, D. (author)
- Baranov, Y. (author)
- Belo, P. (author)
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- Bertalot, L. (author)
- Borba, D. (author)
- Challis, C. D. (author)
- Ciric, D. (author)
- Conroy, S. (author)
- de Baar, M. (author)
- de Vries, P. (author)
- Dumortier, P. (author)
- Garzotti, L. (author)
- Hawkes, N. C. (author)
- Hender, T. C. (author)
- Joffrin, E. (author)
- Jones, T. T. C. (author)
- Kiptily, V. (author)
- Lamalle, P. (author)
- Mailloux, J. (author)
- Mantsinen, M. (author)
- McDonald, D. C. (author)
- Nave, M. F. F. (author)
- Neu, R. (author)
- O'Mullane, M. (author)
- Ongena, J. (author)
- Pearce, R. J. (author)
- Popovichev, S. (author)
- Sharapov, S. E. (author)
- Stamp, M. (author)
- Stober, J. (author)
- Surrey, E. (author)
- Valovic, M. (author)
- Voitsekhovitch, I. (author)
- Weisen, H. (author)
- Whiteford, A. D. (author)
- Worth, L. (author)
- Yavorskij, V. (author)
- Zastrow, K. D. (author)
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- (creator_code:org_t)
- 2005
- 2005
- English.
- In: Nuclear Fusion. - 0029-5515 .- 1741-4326. ; 45:10, s. S181-S194
- Journal article (peer-reviewed)
Abstract
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- Results are presented from the JET Trace Tritium Experimental (TTE) campaign using minority tritium (T) plasmas (n(T)/n(D) < 3%). Thermal tritium particle transport coefficients (D-T, nu(T)) are found to exceed neo-classical values in all regimes, except in ELMy H-modes at high densities and in the region of internal transport barriers (ITBs) in reversed shear plasmas. In ELMy H-mode dimensionless parameter scans, at q(95) 2.8 and triangularity delta = 0.2, the T particle transport scales in a gyro-Bohm manner in the inner plasma (r/a < 0.4), whilst the outer plasma particle transport scaling is more Bohm-like. Dimensionless parameter scans show contrasting behaviour for the trace particle confinement (increases with collisionality, nu* and beta) and bulk energy confinement (decreases with nu* and is independent of beta). In an extended ELMy H-mode data set, with rho*, nu*, and q varied but with neo-classical tearing modes (NTMs) either absent or limited to weak, benign core modes (4/3 or above), the multiparameter fit to the normalized diffusion coefficient in the outer plasma (0.65 < r/a < 0.8) gives D-T/B-phi similar to rho*(2.46) nu*(-0.23) beta(-1.01) q(2.03). In hybrid scenarios (q(min) similar to 1, low positive shear, no sawteeth), the T particle confinement is found to scale with increasing triangularity and plasma current. Comparing regimes (ELMy H-mode, ITB plasma and hybrid scenarios) in the outer plasma region, a correlation of high values of D-T with high values Of nu(T) is seen. The normalized diffusion coefficients for the hybrid and ITB scenarios do not fit the scaling derived for ELMy H-modes. The normalized tritium diffusion scales with normalized poloidal Larmor radius (rho(theta)* = q rho*) in a manner close to gyro-Bohm (similar to rho(sigma)*(3)), with an added inverse P dependence. The effects of ELMs, sawteeth and NTMs on the T particle transport are described. Fast-ion confinement in current-hole (CH) plasmas was tested in TTE by tritium neutral beam injection into JET CH plasmas. gamma-rays from the reactions of fusion alpha and beryllium impurities (Be-9(alpha, n gamma)C-12) characterized the fast fusion-alpha population evolution. The gamma-decay times are consistent with classical alpha plus parent fast triton slowing down times (tau(Ts) + tau(alpha s)) for high plasma currents (I-p > 2 MA) and monotonic q-profiles. In CH discharges the gamma-ray emission decay times are much lower than classical (tau(Ts) + tau(alpha s)), indicating alpha confinement degradation, due to the orbit losses and particle orbit drift predicted by a 3-D Fokker-Planck numerical code and modelled using TRANSP.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- diii-d tokamak
- iter
- confinement
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Stork, D.
- Baranov, Y.
- Belo, P.
- Bertalot, L.
- Borba, D.
- Brzozowski, Jerz ...
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- Challis, C. D.
- Ciric, D.
- Conroy, S.
- de Baar, M.
- de Vries, P.
- Dumortier, P.
- Garzotti, L.
- Hawkes, N. C.
- Hender, T. C.
- Joffrin, E.
- Jones, T. T. C.
- Kiptily, V.
- Lamalle, P.
- Mailloux, J.
- Mantsinen, M.
- McDonald, D. C.
- Nave, M. F. F.
- Neu, R.
- O'Mullane, M.
- Ongena, J.
- Pearce, R. J.
- Popovichev, S.
- Sharapov, S. E.
- Stamp, M.
- Stober, J.
- Surrey, E.
- Valovic, M.
- Voitsekhovitch, ...
- Weisen, H.
- Whiteford, A. D.
- Worth, L.
- Yavorskij, V.
- Zastrow, K. D.
- show less...
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- NATURAL SCIENCES
- NATURAL SCIENCES
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- Nuclear Fusion
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- Royal Institute of Technology
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