title: High-resolution time-resolved extreme ultraviolet spectroscopy on NSTX.
abstract: We report on upgrades to the flat-field grazing-incidence grating spectrometers X-ray and Extreme Ultraviolet Spectrometer (XEUS) and Long-Wavelength Extreme Ultraviolet Spectrometer (LoWEUS), at the National Spherical Torus Experiment (NSTX) at the Princeton Plasma Physics Laboratory. XEUS employs a variable space grating with an average spacing of 2400 lines/mm and covers the 9-64 Å wavelength band, while LoWEUS has an average spacing of 1200 lines/mm and is positioned to monitor the 90-270 Å wavelength band. Both spectrometers have been upgraded with new cameras that achieve 12.5 ms time resolution. We demonstrate the new time resolution capability by showing the time evolution of iron in the NSTX plasma.
authors.affiliation: Space Sciences Laboratory, University of California, Berkeley, California 94720, USA. lepson@ssl.berkeley.edu
authors.forename: J K
authors.initials: JK
authors.lastname: Lepson
authors.forename: P
authors.initials: P
authors.lastname: Beiersdorfer
authors.forename: J
authors.initials: J
authors.lastname: Clementson
authors.forename: M
authors.initials: M
authors.lastname: Bitter
authors.forename: K W
authors.initials: KW
authors.lastname: Hill
authors.forename: R
authors.initials: R
authors.lastname: Kaita
authors.forename: C H
authors.initials: CH
authors.lastname: Skinner
authors.forename: A L
authors.initials: AL
authors.lastname: Roquemore
authors.forename: G
authors.initials: G
authors.lastname: Zimmer
mesh_terms: D004583:Electrons; D010825:Physics / Q000295:instrumentation*; D058626:Plasma Gases / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet / Q000295:instrumentation*; D013997:Time Factors
chemical_list: D058626:Plasma Gases