Related Experiment Video
Updated: May 17, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
High-resolution time-resolved extreme ultraviolet spectroscopy on NSTX
J K Lepson1, P Beiersdorfer, J Clementson
1Space Sciences Laboratory, University of California, Berkeley, California 94720, USA. lepson@ssl.berkeley.edu
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.
Related Concept Videos
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
Atomic Emission Spectroscopy: Instrumentation
UV–Vis Spectroscopy: Molecular Electronic Transitions
UV–Vis Spectrometers
Atomic Emission Spectroscopy: Lab
Atomic Emission Spectroscopy: Overview

