title: Novel mechanism of anomalous electron heat conductivity and thermal crashes during Alfvénic activity in the Wendelstein 7-AS stellarator.
abstract: Enhanced plasma heat conductivity in the presence of kinetic Alfvén waves (KAW) is predicted theoretically. The enhancement is shown to be strongest when the electron collision frequency exceeds the particle transit frequency in the wave field. Alfvén waves (both KAW and ideal MHD Alfvén eigenmodes generating the KAW) are studied in a shot of the Wendelstein 7-AS stellarator. On the basis of these results, strong thermal crashes observed during bursting Alfvénic activity in the mentioned shot are explained.
authors.affiliation: Institute for Nuclear Research, Prospekt Nauky 47, Kyiv 03680, Ukraine.
authors.forename: Ya I
authors.initials: YI
authors.lastname: Kolesnichenko
authors.forename: Yu V
authors.initials: YV
authors.lastname: Yakovenko
authors.forename: A
authors.initials: A
authors.lastname: Weller
authors.forename: A
authors.initials: A
authors.lastname: Werner
authors.forename: J
authors.initials: J
authors.lastname: Geiger
authors.forename: V V
authors.initials: VV
authors.lastname: Lutsenko
authors.forename: S
authors.initials: S
authors.lastname: Zegenhagen