Showing 31 - 40 of 260 Conference Paper Results
2022
UKAEA-STEP-CP(23)08
48th EPS Conference on Plasma Physics, Maastricht (Netherlands), June 27 to July 1 2022
Daniel Kennedy Bhavin S Patel Colin M Roach
Microinstabilities often result in turbulence that influences energy confinement in tokamak discharges. One such microinstability, of particular importance to the design of next-generation spherical tokamaks (STs) such as STEP [1], is the microtearing mode (MTM), a tearing-parity mode centred on high-order rational surfaces. MTMs are short-wavel…
Preprint2022
UKAEA-CCFE-CP(23)47
48th EPS Conference on Plasma Physics, Maastricht (Netherlands), June 27 to July 1 2022
L. Howlett I. Cziegler S. Freethy H. Meyer
A comprehensive L-H power threshold study of MAST data is presented, with a detailed categorisation of transition and intermediate behaviour and a comparison of the results to scaling laws. Preliminary studies into the ion and electron heat flux for transitions at different densities are introduced. The first results of an L-H transition study o…
Preprint2022
UKAEA-CCFE-CP(23)49
15th International Reflectometry Workshop for fusion plasma diagnostics,ITER Council Room, 7 - 10 June 2022
R. B. Morales A. Salmi P. Abreu C. H. S. Amador P. Carman J. Fessey J. Flanagan M. Fontana C. Giroud S. Hacquin S. Heuraux L. Meneses R. Sabot A. Silva A. Sirinelli G. Szepesi D. Taylor D. Terranova.
JET’s frequency-modulated continuous-wave (FMCW) reflectometers have been operating well with the current design since 2005 and density profiles are being automatically calculated intershot since then[1]. However, the calculated profiles had long suffered from several shortcomings – poor agreement to other diagnostics; sometimes inappropriat…
Preprint2022
UKAEA-CCFE-CP(23)48
21ST JOINT WORKSHOP ON ELECTRON CYCLOTRON EMISSION (ECE) AND ELECTRON CYCLOTRON RESONANCE HEATING (ECRH), ITER Headquarters, 20-24 June 2022
G. Giruzzi M. Fontana F.P. Orsitto E. de la Luna R. Dumont L. Figini M. Maslov S. Mazzi S. Schmuck L. Senni C. Sozzi C. Challis D. Frigione J. Garcia L. Garzotti J. Hobirk A. Kappatou D. Keeling E. Lerche C. Maggi J. Mailloux F. Rimini D. Van Eester JET contributors
Recent experiments performed in JET at high level of plasma heating, in preparation of, and during the DT campaign have shown significant discrepancies between electron temperature measurements by Thomson Scattering (TS) and Electron Cyclotron Emission (ECE). In order to perform a systematic analysis of this effect, a simple model of bipolar dis…
Preprint2022
UKAEA-CCFE-CP(23)43
48th EPS Conference on Plasma Physics, Maastricht (Netherlands), June 27 to July 1 2022
R. Scannell the MAST Upgrade EUROfusion Tokamak Exploitation Teams
MAST Upgrade (MAST-U) is a new low aspect ratio device (R/a = 0.85/0.65 ~ 1.3) based on the MAST tokamak that started plasma operations in October 2020. It has substantial new capabilities compared with the original MAST device, with 19 new poloidal field coils (14 of which are within the vacuum vessel) and new, closed, up-down symmetric diverto…
Preprint2022
UKAEA-CCFE-CP(23)45
48th EPS Conference on Plasma Physics, Maastricht (Netherlands), June 27 to July 1 2022
M. Kryjak B. Dudson D. Power S. Mijin C. Ridgers
The study of plasma exhaust remains a core focus of current efforts towards viable DEMO-class magnetically confined fusion devices. The scrape-off layer (SOL) features complex physics. This is especially true for detachment, a mechanism where a cloud of neutrals forms at the divertor target and becomes a sink of plasma energy, momentum and part…
Preprint2022
UKAEA-CCFE-CP(23)51
32nd Symposium on Fusion Technology (SOFT), Dubrovnik, Croatia, 18–23 September 2022
Georgina Graham Alexander Pearce James Morris Richard Kembleton
The EU DEMO power plant is the final stage of the EUROfusion Fusion Technology Programme’s route to commercially viable electricity supply [1]. The selection of apposite technologies for DEMO power plant sub-systems is essential. The breeding blanket, responsible for absorption of nuclear energy, tritium fuel production and a substantial proporti…
Preprint2022
UKAEA-CCFE-CP(23)53
32nd Symposium on Fusion Technology (SOFT), Dubrovnik, Croatia, 18–23 September 2022
A. Shepherd B. Pouradier-Duteil T. Patton A. Rigoni Garola A. Pimazzoni
The ITER Heating Neutral Beam (HNB) source prototype SPIDER (Source for the Production of Ions of Deuterium Extracted from a Radio frequency plasma), hosted at the Neutral Beam Test Facility (NBTF) in Padova, Italy, has recently started operating with evaporated caesium in the source. This moves the primary H- production mechanism from volume to…
Preprint2022
UKAEA-CCFE-CP(23)54
24th Topical Conference on Radio-frequency Power in Plasmas, Annapolis, Maryland (USA), 2-5 May 2022
K K Kirov F. Auriemma R. Bilato C. Challis E. De la Luna J. Garcia J. Hobirk P. Jacquet A. Kappatou Y. Kazakov D. Keeling D. King V. Kiptily E. Lerche C. Maggi J. Mailloux P. Mantica M. Mantsinen M. Maslov R. Sharma Z. Stancar D. Van Eester JET-EFDA contributors
Several Ion Cyclotron Resonance Heating (ICRH) schemes in DT plasma have been considered for the ITER reactor [1]. Most of these heating schemes are minority heating at fundamental frequency. In DT plasma, both reactants can also absorb RF power as majorities at fundamental n=1 or harmonic n=2 frequency. Understanding benefits of directly heatin…
Preprint2022
UKAEA-STEP-CP(23)07
48th EPS Conference on Plasma Physics, Maastricht (Netherlands), June 27 to July 1 2022