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Updated: May 17, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
High resolution ion Doppler spectroscopy at Prairie View Rotamak
Saeid Houshmandyar1, Xiaokang Yang, Richard Magee
1Solar Observatory Department, Prairie View A&M University, Prairie View, Texas 77446, USA. houshmandyar@gmail.com
Abstract:
A fast ion Doppler spectroscopy (IDS) diagnostic system is installed on the Prairie View Rotamak to measure ion temperature and plasma flow. The diagnostic employs a single channel photomultiplier tube and a Jarrell-Ash 50 monochromator with a diffraction grating line density of 1180 lines/mm, which allows for first order spectra of 200-600 nm. The motorized gear of the monochromator allows spectral resolution of 0.01 nm. Equal IDS measurements are observed for various impurity emission lines of which carbon lines exhibit stronger intensities. Furthermore, the diagnostics is examined in an experiment where plasma experiences sudden disruption and quick recovery. In this case, the IDS measurements show ~130% increase in ion temperature. Flow measurements are shown to be consistent with plasma rotation.
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