title: High-power electrostatic free-electron maser as a future source for fusion plasma heating: experiments in the short-pulse regime.
abstract: A high-power, frequency-tunable electrostatic free-electron maser, being developed at the FOM Institute for Plasma Physics "Rijnhuizen," shows lasing at various frequencies. An output power of 730 kW at 206 GHz is generated by a 7.2-A, 1.77-MeV electron beam, and 380 kW at 165 GHz is generated by a 7.4-A, 1.65-MeV electron beam. In the present experimental setup, without recovery of the spent electron beam power, the pulse length is limited to 12 micros. Nevertheless, the main issues, such as the possibility of high-power, single-mode operation and frequency tuning, have been confirmed. The experimental results and the dynamics of the laser process are well in accordance with simulations.
authors.affiliation: FOM Instituut voor Plasmafysica Rijnhuizen, Association EURATOM-FOM, Postbus 1207, 3430 BE Nieuwegein, The Netherlands. urbanus@rijnh.nl
authors.forename: W H
authors.initials: WH
authors.lastname: Urbanus
authors.forename: W A
authors.initials: WA
authors.lastname: Bongers
authors.forename: C A
authors.initials: CA
authors.lastname: van Der Geer
authors.forename: P
authors.initials: P
authors.lastname: Manintveld
authors.forename: J
authors.initials: J
authors.lastname: Plomp
authors.forename: J
authors.initials: J
authors.lastname: Pluygers
authors.forename: A J
authors.initials: AJ
authors.lastname: Poelman
authors.forename: P H
authors.initials: PH
authors.lastname: Smeets
authors.forename: A G
authors.initials: AG
authors.lastname: Verhoeven
authors.forename: V L
authors.initials: VL
authors.lastname: Bratman
authors.forename: G G
authors.initials: GG
authors.lastname: Denisov
authors.forename: A V
authors.initials: AV
authors.lastname: Savilov
authors.forename: M Y
authors.initials: MY
authors.lastname: Shmelyov
authors.forename: M
authors.initials: M
authors.lastname: Caplan
authors.forename: A A
authors.initials: AA
authors.lastname: Varfolomeev
authors.forename: S V
authors.initials: SV
authors.lastname: Tolmachev
authors.forename: S N
authors.initials: SN
authors.lastname: Ivanchenkov