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Feedback control of the sawtooth period through real time control of the ion cyclotron resonance frequency (Articolo in rivista)

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Feedback control of the sawtooth period through real time control of the ion cyclotron resonance frequency (Articolo in rivista) (literal)

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Lennholm, M [ 1,2,3 ] ; Blackman, T [ 4 ] ; Chapman, IT [ 4 ] ; Eriksson, LG [ 2,3 ] ; Graves, JP [ 5 ] ; Howell, DF [ 4 ] ; de Baar, M [ 6 ] ; Calabro, G [ 7 ] ; Dumont, R [ 2 ] ; Graham, M [ 4 ] ; Jachmich, S [ 4,8 ] ; Mayoral, ML [ 4 ] ; Sozzi, C [ 9 ] ; Stamp, M [ 4 ] ; Tsalas, M [ 1,6,10 ] ; de Vries, P [ 4,6 ]; and JET-EFDA contributors (2011)
Feedback control of the sawtooth period through real time control of the ion cyclotron resonance frequency
in Nuclear fusion; IOP Publishing Ltd., Bristol BS1 6BE (Regno Unito)
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Lennholm, M [ 1,2,3 ] ; Blackman, T [ 4 ] ; Chapman, IT [ 4 ] ; Eriksson, LG [ 2,3 ] ; Graves, JP [ 5 ] ; Howell, DF [ 4 ] ; de Baar, M [ 6 ] ; Calabro, G [ 7 ] ; Dumont, R [ 2 ] ; Graham, M [ 4 ] ; Jachmich, S [ 4,8 ] ; Mayoral, ML [ 4 ] ; Sozzi, C [ 9 ] ; Stamp, M [ 4 ] ; Tsalas, M [ 1,6,10 ] ; de Vries, P [ 4,6 ]; and JET-EFDA contributors (literal)

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[ 1 ] Culham Sci Ctr, EFDA Close Support Unit, Abingdon OX14 3DB, Oxon, England [ 2 ] CEA, IRFM, F-13108 St Paul Les Durance, France [ 3 ] Commiss European Communities, B-1049 Brussels, Belgium [ 4 ] Culham Sci Ctr, EURATOM CCFE Fus Assoc, Abingdon OX14 3DB, Oxon, England [ 5 ] Ecole Polytech Fed Lausanne, Assoc EURATOM Confederat Suisse, CRPP, CH-1015 Lausanne, Switzerland [ 6 ] EURATOM, FOM Inst Plasma Phys Rijnhuizen, Trilateral Euregio Clust, Netherlands [ 7 ] CR Frascati, Assoc EURATOM ENEA Fus, Rome, Italy [ 8 ] EURATOM, Max Planck IPP, D-17491 Greifswald, Germany [ 9 ] EURATOM, Ist Fis Plasma CNR, I-20125 Milan, Italy [ 10 ] Natl Tech Univ Athens, Assoc EURATOM Hellen Republ, GR-15773 Athens, Greece [ 11 ] Culham Sci Ctr, JET EFDA, Abingdon OX14 3DB, Oxon, England (literal)

Titolo

Feedback control of the sawtooth period through real time control of the ion cyclotron resonance frequency (literal)

Abstract

Modification of the sawtooth period through ion cyclotron resonance frequency (ICRF) heating and current drive has been demonstrated in a number of experiments. The effect has been seen to depend critically on the location of the ICRF absorption region with respect to the q = 1 flux surface. Consequently, for ICRF to be a viable tool for sawtooth control, one must be able to control the ICRF absorption location in real time so as to follow variations in the location of the q = 1 surface. To achieve this, the JET ICRF system has been modified to allow the JET real time central controller to control the frequency of the ICRF generators. An algorithm for real time determination of the sawtooth period has been developed and a closed loop controller, which modifies the frequency of the ICRF generators to bring the measured sawtooth period to the desired reference value, has been implemented. This paper shows the first experimental demonstration of closed loop sawtooth period control by real time variation of the ICRF wave frequency. (literal)

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