skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Localized measurement of short wavelength plasma fluctuations with the DIII-D phase contrast imaging diagnostic

Abstract

A novel rotating mask system has been designed and implemented on the DIII-D phase contrast imaging (PCI) diagnostic to produce the first spatially localized PCI measurements of a tokamak plasma. The localization technique makes use of the variation in the magnetic field component perpendicular to the viewing chord as a function of chord height. This new capability provides measurements in the range of 2<k<30 cm{sup -1}, 10 kHz<f<10 MHz, and 0.7<r/a<1. This technique provides a spatial resolution of 10 cm at k=15 cm{sup -1} and can realistically provide measurements at a rate of 10 profiles/s. Calibration measurements show accurate characterization of the system transfer function making feasible a time dependent analysis that results in improved localization. Initial measurements show turbulence to peak near the plasma edge. This upgrade is part of a broader program to operate the DIII-D PCI at wave numbers up to 40 cm{sup -1} to probe electron scale turbulence in the plasma core.

Authors:
; ;  [1]
  1. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
21266755
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 80; Journal Issue: 2; Other Information: DOI: 10.1063/1.3065094; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BOUNDARY LAYERS; CALIBRATION; DOUBLET-3 DEVICE; ELECTRONS; FLUCTUATIONS; HEIGHT; MAGNETIC FIELDS; PLASMA; PLASMA DIAGNOSTICS; SPATIAL RESOLUTION; TIME DEPENDENCE; TRANSFER FUNCTIONS; TURBULENCE; WAVELENGTHS

Citation Formats

Dorris, J R, Rost, J C, and Porkolab, M. Localized measurement of short wavelength plasma fluctuations with the DIII-D phase contrast imaging diagnostic. United States: N. p., 2009. Web. doi:10.1063/1.3065094.
Dorris, J R, Rost, J C, & Porkolab, M. Localized measurement of short wavelength plasma fluctuations with the DIII-D phase contrast imaging diagnostic. United States. https://doi.org/10.1063/1.3065094
Dorris, J R, Rost, J C, and Porkolab, M. 2009. "Localized measurement of short wavelength plasma fluctuations with the DIII-D phase contrast imaging diagnostic". United States. https://doi.org/10.1063/1.3065094.
@article{osti_21266755,
title = {Localized measurement of short wavelength plasma fluctuations with the DIII-D phase contrast imaging diagnostic},
author = {Dorris, J R and Rost, J C and Porkolab, M},
abstractNote = {A novel rotating mask system has been designed and implemented on the DIII-D phase contrast imaging (PCI) diagnostic to produce the first spatially localized PCI measurements of a tokamak plasma. The localization technique makes use of the variation in the magnetic field component perpendicular to the viewing chord as a function of chord height. This new capability provides measurements in the range of 2<k<30 cm{sup -1}, 10 kHz<f<10 MHz, and 0.7<r/a<1. This technique provides a spatial resolution of 10 cm at k=15 cm{sup -1} and can realistically provide measurements at a rate of 10 profiles/s. Calibration measurements show accurate characterization of the system transfer function making feasible a time dependent analysis that results in improved localization. Initial measurements show turbulence to peak near the plasma edge. This upgrade is part of a broader program to operate the DIII-D PCI at wave numbers up to 40 cm{sup -1} to probe electron scale turbulence in the plasma core.},
doi = {10.1063/1.3065094},
url = {https://www.osti.gov/biblio/21266755}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 2,
volume = 80,
place = {United States},
year = {2009},
month = {2}
}