title: A Thomson scattering diagnostic on the Pegasus Toroidal experiment.
abstract: By exploiting advances in high-energy pulsed lasers, volume phase holographic diffraction gratings, and image intensified CCD cameras, a new Thomson scattering system has been designed to operate from 532 - 592 nm on the Pegasus Toroidal Experiment. The system uses a frequency-doubled, Q-switched Nd:YAG laser operating with an energy of 2 J at 532 nm and a pulse duration of 7 ns FWHM. The beam path is < 7m, the beam diameter remains ≤ 3 mm throughout the plasma, and the beam dump and optical baffling is located in vacuum but can be removed for maintenance by closing a gate valve. A custom lens system collects scattered photons from 15 cm < R(maj) < 85 cm at ~F∕6 with 14 mm radial resolution. Initial measurements will be made at 12 spatial locations with 12 simultaneous background measurements at corresponding locations. The estimated signal at the machine-side collection optics is ~3.5 × 10(4) photons for plasma densities of 10(19) m(-3). Typical plasmas measured will range from densities of mid-10(18) to mid-10(19) m(-3) with electron temperatures from 10 to 1000 eV.
authors.affiliation: Department of Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706, USA. schlossberg@wisc.edu
authors.forename: D J
authors.initials: DJ
authors.lastname: Schlossberg
authors.forename: N L
authors.initials: NL
authors.lastname: Schoenbeck
authors.forename: A S
authors.initials: AS
authors.lastname: Dowd
authors.forename: R J
authors.initials: RJ
authors.lastname: Fonck
authors.forename: J I
authors.initials: JI
authors.lastname: Moritz
authors.forename: K E
authors.initials: KE
authors.lastname: Thome
authors.forename: G R
authors.initials: GR
authors.lastname: Winz