Next-step-targeted experiments on the Mega-Amp Spherical Tokamak
- 22 April 2003
- journal article
- research article
- Published by AIP Publishing in Physics of Plasmas
- Vol. 10 (5), 1803-1808
- https://doi.org/10.1063/1.1562938
Abstract
Since its first physics campaign, the principal parameters on MAST (Mega-Amp Spherical Tokamak) [A. Sykes et al., Nuclear Fusion 41, 1423 (2001)] have been brought up towards their design values. Considerable advances have been made in a range of physics areas of direct relevance to the International Thermonuclear Experimental Reactor (ITER) [ITER Physics Basis, Nuclear Fusion 39, 2175 (1999)]. In this paper, results on -mode access, global confinement and pedestal studies are presented and compared with conventional aspect ratio tokamak scalings. Physics and engineering requirements relevant to next step spherical tokamak devices are discussed, in particular the plasma formation, current ramp-up and sustainment, and plasma exhaust. Results of first experiments directly targeting these issues are presented: Plasma current up to 0.5 MA has been produced without use of the central solenoid flux, and current ramp-up and sustainment without use of the central solenoid flux has been demonstrated. Experiments on neutral beam heating and current drive (CD) demonstrate up to 50% bootstrap current fraction and good CD efficiency, and divertor power loading has been found to be tolerable and have a favorable outboard asymmetry.
Keywords
This publication has 11 references indexed in Scilit:
- H-mode access and performance in the Mega-Amp Spherical TokamakPhysics of Plasmas, 2002
- Plasma Current Start-up. Ramp-up. and Achievement of Advanced Tokamak Plasmas without the Use of Ohmic Heating Solenoid in JT-60U.Journal of Plasma and Fusion Research, 2002
- Overview of the initial NSTX experimental resultsNuclear Fusion, 2001
- First results from MASTNuclear Fusion, 2001
- A conceptual design of a spherical tokamak power plantFusion Engineering and Design, 2000
- Steady state operation of spherical tokamaksNuclear Fusion, 2000
- Chapter 2: Plasma confinement and transportNuclear Fusion, 1999
- Spherical tokamak volume neutron sourceFusion Engineering and Design, 1999
- The Spherical Tokamak Path to Fusion PowerFusion Technology, 1998
- First results from the START experimentNuclear Fusion, 1992