CNR ExploRA

Articolo in rivista, 2013, ENG, 10.1016/j.fusengdes.2013.02.170

A first approach to runaway electron control in FTU

L. Boncagni; D. Carnevale; C. Cianfarani; B. Esposito; G. Granucci; G. Maddaluno; D. Marocco; J.R. Martin-Solis; G. Pucella; C. Sozzi; G. Varano; V. Vitale; L. Zaccarian

a Dipartimento Ing. Civile ed Ing. Informatica Universita? di Roma, Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy b Associazione Euratom/ENEA sulla Fusione, Centro Ricerche Frascati, CP 65, 00044 Frascati, Roma, Italy c Associazione Euratom-CNR sulla Fusione, IFP-CNR, Via R. Cozzi 53, 20125 Milano, Italy d CNRS, LAAS, 7 av. du colonel Roche, F-31400 Toulouse, France e Univ. de Toulouse, LAAS, F-31400 Toulouse, France f Universidad Carlos III de Madrid, Avda. de la Universidad 30, 28911 Leganes-Madrid, Spain

Abstract The Plasma Control System (PCS) of the Frascati Tokamak Upgrade (FTU) is not equipped with any runaway electron (RE) beam control or suppression tool. In this paper we propose an upgraded {PCS} including an architecture for the control of disruption-generated {REs} that, making use of filtering techniques to estimate the onsets of the current quench (CQ) and of the {RE} beam current plateau, provides a controlled plasma current shut-down and a simultaneous {RE} position control. The control strategy is based on a nonlinear technique, called Input Allocation, that allows to re-configure the current in the poloidal field (PF) coils and improve the {PCS} responsiveness needed for {RE} position control. Preliminary results on the implementation of the Input Allocation and an experimental proposal to test the control scheme architecture are discussed.

Fusion engineering and design 88 (6-8), pp. 1109–1112