5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P2.041 Modeling and mitigation of the magnetic field errors in RFX-mod Upgrade

6 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 41
Poster C. Plasma Engineering and Control P2 Poster session

Speaker

Luca Grando (Consorzio RFX)

Description

RFX [1] was originally designed with a load assembly consisting of a vacuum vessel (VV) and a thick aluminum stabilizing shell, with two poloidal and two equatorial cuts (i.e. gaps). After several years of experimental campaigns, a major modification of the RFX load assembly has been introduced [2], consisting in the substitution of the aluminum shell with a thin Copper Shell (CS) and the installation of a stainless steel Toroidal Supporting Structure (TSS). At the same time, the machine has been equipped with an innovative active control system of MHD modes [3]. After a relatively long period of successful operations, further modifications of the magnetic front-end of RFX-mod have been recently considered. In particular, the VV will be removed with the aim of improving passive MHD control (plasma-shell proximity increase) and plasma rotation (preventing the braking torque caused by the VV itself). In this paper, a detailed analysis of the new magnetic front-end is presented, with particular emphasis on modeling of the magnetic field errors generated at the poloidal gaps (butt-joint configuration) during the transient phases of the discharge. A non linear equilibrium code, MAXFEA [4], has been used to simulate a reference scenario and provide the time evolution of PF coils and plasma currents as input of the 3D FEM analyses. A set of gap correction coils, previously installed in RFX [5], have also been included in the model to assess its capacity to minimize the error field at plasma edge, complementing the work presented in [6]. [1] Topical issue on RFX-experiment, FED 25 (1995)[2] P. Sonato, FED 66-68 (2003) 161-168 [3] G. Marchiori, FED 82 (2007) 1015–1022[4] P. Bettini, NF 43 (2003) 119–129[5] F. Bellina, FT 1 (1997) 771–775[6] P. Bettini, FED 96-97 (2015) 649-653

Co-authors

Claudio Finotti (Consorzio RFX, Corso Stati Uniti 4, 35127, Padova, Italy) Giuseppe Marchiori (Consorzio RFX, Corso Stati Uniti 4, 35127, Padova, Italy) Luca Grando (Consorzio RFX, Corso Stati Uniti 4, 35127, Padova, Italy) Paolo Bettini (Consorzio RFX, Corso Stati Uniti 4, 35127, Padova, Italy;DII, Università di Padova, Via Gradenigo 6/A, 35131, Padova, Italy) Ruben Specogna (DIEGM, Università di Udine, Via delle Scienze 206, Udine, Italy)

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