title: MHD marking using the MSE polarimeter optics in ILW JET plasmas.
abstract: In this communication we propose a novel diagnostic technique, which uses the collection optics of the JET Motional Stark Effect (MSE) diagnostic, to perform polarimetry marking of observed MHD in high temperature plasma regimes. To introduce the technique, first we will present measurements of the coherence between MSE polarimeter, electron cyclotron emission, and Mirnov coil signals aiming to show the feasibility of the method. The next step consists of measuring the amplitude fluctuation of the raw MSE polarimeter signals, for each MSE channel, following carefully the MHD frequency on Mirnov coil data spectrograms. A variety of experimental examples in JET ITER-Like Wall (ILW) plasmas are presented, providing an adequate picture and interpretation for the MSE optics polarimeter technique.
authors.affiliation: IPFN, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal.
authors.forename: S
authors.initials: S
authors.lastname: Reyes Cortes
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: B
authors.initials: B
authors.lastname: Alper
authors.affiliation: European Organization for Nuclear Research, CERN, F-01631CERN Cedex, France.
authors.forename: D
authors.initials: D
authors.lastname: Alves
authors.affiliation: Conzorsio RFX, Corso Stati Uniti 4, 35127 Padova, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Baruzzo
authors.affiliation: IPFN, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal.
authors.forename: J
authors.initials: J
authors.lastname: Bernardo
authors.affiliation: ENEA C. R. Frascati, Via E. Fermi 45, Frascati, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Buratti
authors.affiliation: IPFN, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal.
authors.forename: R
authors.initials: R
authors.lastname: Coelho
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: C
authors.initials: C
authors.lastname: Challis
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: I
authors.initials: I
authors.lastname: Chapman
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: N
authors.initials: N
authors.lastname: Hawkes
authors.affiliation: CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.
authors.forename: T C
authors.initials: TC
authors.lastname: Hender
authors.affiliation: Max-Planck-Institute fur Plasmaphysik, Euratom Association, 85748 Garching bei Munchen, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Hobirk
authors.affiliation: IRFM-CEA, Centre de Cadarache, 13108 Saint-Paul-lez-Durance, France.
authors.forename: E
authors.initials: E
authors.lastname: Joffrin
authors.affiliation: EUROfusion Consortium, JET, Culham Science Centre, Abingdon OX14 3DB, United KingdomIPFN, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, PortugalCCFE, Culham Science Centre, Abingdon OX14 3DB, United KingdomEuropean Organization for Nuclear Research, CERN, F-01631CERN Cedex, FranceConzorsio RFX, Corso Stati Uniti 4, 35127 Padova, ItalyENEA C. R. Frascati, Via E. Fermi 45, Frascati, ItalyMax-Planck-Institute fur Plasmaphysik, Euratom Association, 85748 Garching bei Munchen, GermanyIRFM-CEA, Centre de Cadarache, 13108 Saint-Paul-lez-Durance, France.