000204582 001__ 204582
000204582 005__ 20190228220034.0
000204582 0247_ $$2doi$$a10.1016/j.fusengdes.2014.09.019
000204582 022__ $$a0920-3796
000204582 02470 $$2ISI$$a000350078500001
000204582 037__ $$aARTICLE
000204582 245__ $$aTokamak equilibrium reconstruction code LIUQE and its real time implementation
000204582 269__ $$a2015
000204582 260__ $$aLausanne$$bElsevier$$c2015
000204582 300__ $$a15
000204582 336__ $$aJournal Articles
000204582 520__ $$aEquilibrium reconstruction consists in identifying, from experimental measurements, a distribution of the plasma current density that satisfies the pressure balance constraint. The LIUQE code adopts a computationally efficient method to solve this problem, based on an iterative solution of the Poisson equation coupled with a linear parametrisation of the plasma current density. This algorithm is unstable against vertical gross motion of the plasma column for elongated shapes and its application to highly shaped plasmas on TCV requires a particular treatment of this instability. TCV's continuous vacuum vessel has a low resistance designed to enhance passive stabilisation of the vertical position. The eddy currents in the vacuum vessel have a sizeable influence on the equilibrium reconstruction and must be taken into account. A real time version of LIUQE has been implemented on TCV's distributed digital control system with a cycle time shorter than 200 μs for a full spatial grid of 28 by 65, using all 133 experimental measurements and including the flux surface average of quantities necessary for the real time solution of 1.5 D transport equations. This performance was achieved through a thoughtful choice of numerical methods and code optimisation techniques at every step of the algorithm, and was coded in Matlab and Simulink for the off-line and real time version respectively.
000204582 6531_ $$aTokamak
000204582 6531_ $$aMHD
000204582 6531_ $$aEquilibrium
000204582 6531_ $$aReconstruction
000204582 6531_ $$aReal-time
000204582 700__ $$aMoret, J-M
000204582 700__ $$aDuval, B P
000204582 700__ $$aLe, H B
000204582 700__ $$aCoda, S
000204582 700__ $$aFelici, F
000204582 700__ $$aReimerdes, H
000204582 773__ $$j91$$q1-15$$tFusion Engineering and Design
000204582 8564_ $$uhttp://www.sciencedirect.com/science/journal/09203796$$zURL
000204582 8564_ $$uhttps://crpplocal.epfl.ch/pinboard/jpapers/1401510.pdf$$zURL
000204582 8564_ $$s411474$$uhttps://infoscience.epfl.ch/record/204582/files/LIUQEpaperCompact.pdf$$yn/a$$zn/a
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000204582 937__ $$aEPFL-ARTICLE-204582
000204582 970__ $$a14015/CRPP
000204582 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000204582 980__ $$aARTICLE