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Overview of transpo...
Overview of transport, fast particle and heating and current drive physics using tritium in JET plasmas
- Article/chapterEnglish2005
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LIBRIS-ID:oai:DiVA.org:kth-15172
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-15172URI
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https://doi.org/10.1088/0029-5515/45/10/S15DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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QC 20100525 QC 20111012
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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.
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Baranov, Y.
(author)
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Belo, P.
(author)
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Bertalot, L.
(author)
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Borba, D.
(author)
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Brzozowski, Jerzy H. H.KTH,Alfvénlaboratoriet(Swepub:kth)u15w8y5m
(author)
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Challis, C. D.
(author)
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Ciric, D.
(author)
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Conroy, S.
(author)
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de Baar, M.
(author)
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de Vries, P.
(author)
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Dumortier, P.
(author)
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Garzotti, L.
(author)
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Hawkes, N. C.
(author)
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Hender, T. C.
(author)
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Joffrin, E.
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Jones, T. T. C.
(author)
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Kiptily, V.
(author)
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Lamalle, P.
(author)
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Mailloux, J.
(author)
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Mantsinen, M.
(author)
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McDonald, D. C.
(author)
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Nave, M. F. F.
(author)
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Neu, R.
(author)
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O'Mullane, M.
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Ongena, J.
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Pearce, R. J.
(author)
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Popovichev, S.
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Sharapov, S. E.
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Stamp, M.
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Stober, J.
(author)
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Surrey, E.
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Valovic, M.
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Voitsekhovitch, I.
(author)
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Weisen, H.
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Whiteford, A. D.
(author)
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Worth, L.
(author)
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Yavorskij, V.
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Zastrow, K. D.
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KTHAlfvénlaboratoriet
(creator_code:org_t)
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In:Nuclear Fusion45:10, s. S181-S1940029-55151741-4326
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Stork, D.
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Baranov, Y.
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Belo, P.
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Bertalot, L.
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Borba, D.
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Brzozowski, Jerz ...
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Challis, C. D.
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Ciric, D.
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Conroy, S.
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de Baar, M.
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de Vries, P.
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Dumortier, P.
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Garzotti, L.
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Hawkes, N. C.
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Hender, T. C.
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Joffrin, E.
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Jones, T. T. C.
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Kiptily, V.
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Lamalle, P.
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Mailloux, J.
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Mantsinen, M.
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McDonald, D. C.
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Nave, M. F. F.
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Neu, R.
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O'Mullane, M.
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Ongena, J.
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Pearce, R. J.
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Popovichev, S.
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Sharapov, S. E.
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Stamp, M.
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Stober, J.
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Surrey, E.
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Valovic, M.
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Voitsekhovitch, ...
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Weisen, H.
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Whiteford, A. D.
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Worth, L.
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Yavorskij, V.
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Zastrow, K. D.
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Nuclear Fusion
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Royal Institute of Technology