A. Huber S. Brezinsek Ph. Mertens B. Schweer G. Sergienko et al.
A new endoscope with optimised divertor view has been developed in order to survey and monitor the emission of specific impurities such as tungsten and the remaining carbon as well as beryllium in the tungsten divertor of JET after the implementation of the ITER-like wall in 2011. The endoscope is a prototype for testing an ITER relevant design con…
PublishedA. Kreter H. G. Esser S. Brezinsek J. P. Coad A. Kirschner W. Fundamenski V. Philipps R. A. Pitts A. Widdowson
The impact of edge localized modes (ELMs) carrying energies of up to 450 kJ on carbon erosion in the JET inner divertor is assessed by means of time resolved measurements using an in situ quartz microbalance diagnostic. The inner target erosion is strongly nonlinearly dependent on the ELM energy: a single 400 kJ ELM produces the same carbon erosion…
PublishedM. Krychowiak Ph. Mertens B. Schweer S. Brezinsek R. Konig O. Schmitz M. Brix T. Klinger U. Samm
Local values of the electron density and temperature in the edge of a fusion plasma can be derived with high space and time resolution by the use of line radiation of atomic helium beams. The accuracy of this method is mainly limited by the uncertainties in the coUisional-radiative model which is needed in order to obtain both plasma parameters fro…
PublishedM. F. F. Nave H. R. Koslowski S. Coda J. Graves M. Brix R. Buttery C. Challis C. Giroud M. Stamp P. De Vries Jet-Feda Contributors
During a recent reversed toroidal field (B T) campaign at the Joint European Torus (JET), experiments were performed to investigate the effect on sawteeth of neutral beam injection (NBI)-driven toroidal plasma rotation counter to the direction of the toroidal plasma current and B T . A power scan at constant density has permitted analytical continu…
PublishedRJH Pearce AC Bell D Brennan H Boyer J Bruce T Budd PR Butcher N Davies T Edlington R Felton J Harling T Hartrampf M Hitchin S Hotchin TTC Jones R King G Lawrence R Lobel P Morgan SR Shaw M Stamp E Surrey D Wilson L Worth K Zastrow
‘Trace Tritium Experiments’ (TTE) were successfully performed on JET in 2003. The Campaign marked the first use of tritium in JET plasmas since the Deuterium- Tritium Experiment (DTE1) Campaign in 1997, and was the first use of tritium in experiments under the EFDA organisation with the UKAEA as JET Operator. The safety and regulatory preparati…
PublishedN. J. Peacock K. D. Lawson R. Barnsley H. Chen
An empirical procedure, ‘‘LINT,’’ for relating emission line intensities of intrinsic impurity ions to their elemental contributions to the total, bolometric, radiation loss and the volume-averaged effective ion charge, Zeff , has been developed and applied to limiter plasmas in the JET tokamak. In this article we discuss extensions to the …
PublishedN. J. Peacock R. Barnsley K. D. Lawson I. M. Melnick M. G. O’Mullane et al.
Crystal and synthetic multilayer diffractors, deployed either as flat Bragg reflectors, or curved, as in the Johann configuration, are used to study the spectrum of COMPASS-D and other tokamaks in the wavelength region of 1–100 A. In this article, we concentrate on the measurement of absolute photon fluxes and the derivation of volume emissivitie…
Published