A. R. Field J. Mccone N. J. Conway M. Dunstan S. Newton M. Wisse
Neo-classical tokamak plasma theory predicts poloidal rotation driven by the temperature gradient of order ~ few km/s. In conventional aspect ratio tokamak plasmas, e.g. on JET and DIII-D, poloidal velocities considerably in excess of the neo-classical values have been measured, particularly in the presence of internal transport barriers (ITBs), by…
PublishedM. F. M. De Bock N. J. Conway M. J. Walsh P. G. Carolan N. C. Hawkes
A multichord motional Stark effect MSE system has recently been built on the MAST tokamak. In MAST the π and σ lines of the MSE spectrum overlap due to the low magnetic field typical for present day spherical tokamaks. Also, the field curvature results in a large change in the pitch angle over the observation volume. The measured polarization ang…
PublishedR. Lässer A. Antipenkov N. Bekris L.V. Boccaccini C.J. Caldwell-Nichols I. Cristescu Ch. Day M. Gasparotto M. Glugla G. Dell’Orco F. Gabriel O. Gastaldi Ch. Grisolia S. Knipe A. J. Magielsen A. Möslang D. Murdoch R. Pearce A. Perevezents
Tritium as one of the two fuel components for fusion power plays a special role in any fusion device. Due to its volatile character, radioactivity and easy incorporation as HTO it needs to be controlled with special care and due to its scarcity on earth it has to be produced in-situ in future fusion power plants. The paper discusses the present tri…
PublishedRJ.E. Jaspers M.G. Von Hellermann E. Delabie J.E. Boom Aj.H. Donne W. Biel N.C. Hawkes O. Neubauer M. Di Maio S. Sadakov F. Klinkhamer B. Snijders A. Hogenbirk
Charge eXchange Recombination Spectroscopy (CXRS) will play a crucial role in the diagnosing of burning plasmas: items like helium ash, transport barriers, impurity content or fuel ratio can all be assessed with CXRS. In fact this is the only direct method to obtain information about the light impurity ions, such as temperature, concentrations and …
PublishedI.T. Chapman S. Saarelma T.C. Hender S.E. Sharapov G.T.A. Huysmans A.B. Mikhailovskii H. Meyer A. Kirk H.R. Wilson
Present day tokamaks are capable of generating toroidal flows approaching the ion sound speed. Such toroidal rotation is known to have a stabilising effect on resistive wall modes[1]. Here the effects of plasma rotation and diamagnetic drifts on the n = 1 internal kink mode and high n ballooning modes are presented with specific comparison to exper…
PublishedChr. Day D. Brennan P. Camp H.S. Jensen G. Jones A. Mack A. Miller
A cryosorption panel test arrangement was installed in the Cryogenic Forevacuum (CF) Subsystem of the Active Gas Handling System (AGHS) at JET. The pump panels were of ITER relevant design in terms of geometry and dimension, coating and sorbent material. The central objective of this investigation was to study, for the first time in such an in-dept…
PublishedM. R. Siegrist N. Hawkes H. Weisen
This paper presents a feasibility study for a motional Stark effect ( MSE ) [ F. M. Levinton et al. , Phys. Rev. Lett. 63 , 2060 ( 1989 )] diagnostic on the TCV tokamak. A numerical simulation code has been used to identify the optimal port arrangement and geometrical layout. It predicts the expected measurement accuracy for a range of typical plas…
PublishedR. J. Hastie J. J. Ramos F. Porcelli
The linear stability of high-toroidal-number drift-ballooning modes in tokamaks is investigated with a model that includes resistive and viscous dissipation, and assumes the mode frequency to be comparable to both the sound and diamagnetic frequencies. The coupled effect of ion drift waves and electron drift-acoustic waves is shown to be important,…
PublishedF. Durodié P. Lamalle G. Agarici G. Amarante W. Baity et al.
Whereas the essential components for power generation and transmission on an ITERsized ICRF plant are readily available, or only require modest extrapolation of present day ICRF systems, the 1C launching structure itself is regarded as needing development, validation and convincing demonstration. During the ITER-EDA, the design requirements of the …
PublishedD. Chenna Reddy T. Edlington
Electron cyclotron emission (ECE) is a standard diagnostic in present day tokamak devices for temperature measurement. When the plasma density is high enough the emission at some frequencies is cut off. Of these cutoff frequencies, the first frequency to cut off depends on the shape of the density profile. If the density profile can be described by…
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