Plasma density control in real-time on the COMPASS tokamak

0453775 - ÚFP 2016 RIV CH eng J - Journal Article
Janky, Filip - Hron, Martin - Havlíček, Josef - Varavin, Mykyta - Žáček, František - Seidl, Jakub - Pánek, Radomír
Plasma density control in real-time on the COMPASS tokamak.
Fusion Engineering and Design. 96-97, October (2015), s. 637-640. ISSN 0920-3796. E-ISSN 1873-7196.
[Symposium on Fusion Technology 2014(SOFT-28)/28./. San Sebastián, 29.09.2014-03.10.2014]
R&D Projects: GA MŠMT(CZ) LM2011021
EU Projects: European Commission(XE) 633053
Institutional support: RVO:61389021
Keywords : COMPASS tokamak * Real-time control * Density control * MARTe * Interferometer * Stickiness of the valve
OECD category: Nuclear related engineering
Impact factor: 1.301, year: 2015
http://www.sciencedirect.com/science/article/pii/S092037961500294X

The electron density on COMPASS is measured using 2 mm microwave interferometer. Interferometer signal is used as an input for the feedback control loop, running under the MARTe real-time framework. Two different threads are used to calculate (fast 50 μs thread) and to control (slow 500 μs thread) the electron density. The interferometer measures a line averaged density along a measurement chord. This paper describes an approach to control the line-averaged electron density in a real-time loop, using a correction to the real plasma shape, the plasma position, and non-linear effects of the electron density measurement at high densities. Newly developed real-time electron density control give COMPASS the chance to control the electron density more accurately which is essential for parametric scans for diagnosticians, for physics experiments and also for achieving plasma scenarios with H-mode
Permanent Link: http://hdl.handle.net/11104/0254486