V.F. Shevchenko Y.F. Baranov T. Bigelow J.B. Caughman S. Diem C. Dukes P. Finburg J. Hawes C. Gurl J.Griffiths J. Mailloux M. Peng A.N. Saveliev Y. TakaHe H. Tanaka G. Taylor
Start-up technique reported here relies on a double mode conversion (MC) for electron Bernstein wave (EBW) excitation. It consists of MC of the ordinary (0) mode, entering the plasma from the low field side of the tokamak, into the extraordinary (X) mode at a mirror-polarizer located at the high field side. The X mode propagates back to the plasma,…
Preprint PublishedK. K. Kirov A. Ekedahl J. Bernardo M. Goniche J. Mailloux
In this report key aspects of Lower Hybrid Current Drive (LHCD) operation at JET are presented. Amplitude and broadening of the Radio Frequency (RF) spectrum at about 3.7GHz and the frequency shift of the lower sideband were analyzed by means of new diagnostic utilizing RF spectra measurements. Dependencies on plasma density, LH power and the toroi…
Preprint PublishedJ. Figueiredo J. Mailloux K. Kirov D. Kinna M. Stamp S. Devaux G. Arnoux J. S. Edwards A. V. Stephen P. Mccullen C. Hogben JET EFDA Contributors
Arcs are the potentially most dangerous events related to Lower Hybrid (LH) antenna operation. If left uncontrolled they can produce damage and cause plasma disruption by impurity influx. To address this issue an arc real time control and protection imaging system for the Joint European Torus (JET) LH antenna has been implemented. The LH system is …
PublishedM-L. Mayoral V. Bobkov A. Czarnecka I. Day A. Ekedahl P. Jacquet M. Goniche R. King K. Kirov E. Lerche J. Mailloux D. Van Eester O. Asunta C. Challis D. Ciric J.W. Coenen L. Colas C. Giroud M. Graham I. Jenkins E. Joffrin T. Jones D.
The major aspects linked to the use of the JET auxiliary heating systems: NBI, ICRF and LHCD, in the new JET ITER-like wall (JET-ILW) are presented. We show that although there were issues related to the operation of each system, efficient and safe plasma heating was obtained with room for higher power. For the NBI up to 25.7MW was safely injected;…
PublishedK. K. Kirov Yu. Baranov E. Barbato M. Brix G. Corrigan A. Ekedahl M. Goniche J. Mailloux V. Petrzilka F. Rimini M. Stamp JET EFDA Contributors
An overview of the recent results of Lower Hybrid (LH) experiments at JET with the ITER-like wall (ILW) is presented. Topics relevant to LH wave coupling are addressed as well as issues related to ILW and LH system protections. LH wave coupling was studied in conditions determined by ILW recycling and operational constraints. It was concluded that …
PublishedK.K. Kirov J. Mailloux A. Ekedahl V. Petrzilka G. Arnoux Yu. Baranov M. Brix M. Goniche S. Jachmich M.-L. Mayoral J. Ongena F. Rimini M. Stamp JET EFDA Contributors
In this paper important aspects of Lower Hybrid (LH) operation with the ITER Like Wall (ILW) [1] at JET are reported. Impurity release during LH operation was investigated and it was found that there is no significant Be increase with LH power. Concentration of W was analysed in more detail and it was concluded that LH contributes negligibly to its…
PublishedM. Goniche J. Mailloux Y. Baranov T. M. Biewer I. Coffey et al.
During high power commissioning of the JET LH launcher, the radiation and impurity release has been analyzed from various diagnostics: VUV and visible spectroscopy, bolometry. These two last diagnostics have lines-of-sight viewing the launcher and can provide information about the electron and/or impurity source localisation. Using a database of 80…
PublishedJ.-M. Noterdaeme L.-G. Eriksson M. Mantsinen M.-L. Mayoral D. Van Eester J. Mailloux C. Gormezano T. T. C. Jones
The physics studies of the three “heating” systems that are installed on JET are reviewed. Results from the beginning of JET up to now are presented with some emphasis on the more recent ones. The systems were used not only for heating, where JET has laid the groundwork to qualify them for heating the next generation of machines to ignition, bu…
PublishedA S Kaye H Altmann R Albanese D Ciric P Coad D Brennan F Durodie T Edlington D C Edwards R Felton T T C Jones A Lioure P Lomas J Mailloux I Monakhov M Nightingale J Pamela R Pearce V Riccardo J Rapp A Rolfe E Surrey S Rosanvallon T Todd, A Walden
JET supports ITER both in development of technology and in torus operations. The latter include the study of ITER-like scenarios, operation in tritium (a trace tritium campaign has recently been completed), mitigation of ELMs and disruptions, investigation of tritium retention, real time control of plasma parameters, and control of extreme plasma s…
Published