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Title: Simulation of Optical and Synthetic Imaging using Microwave Reflectometry

Abstract

Two-dimensional full-wave time-dependent simulations in full plasma geometry are presented which show that conventional reflectometry (without a lens) can be used to synthetically image density fluctuations in fusion plasmas under conditions where the parallel correlation length greatly exceeds the poloidal correlation length of the turbulence. The advantage of synthetic imaging is that the image can be produced without the need for a large lens of high optical quality, and each frequency that is launched can be independently imaged. A particularly simple arrangement, consisting of a single receiver located at the midpoint of a microwave beam propagating along the plasma midplane is shown to suffice for imaging purposes. However, as the ratio of the parallel to poloidal correlation length decreases, a poloidal array of receivers needs to be used to synthesize the image with high accuracy. Simulations using DIII-D relevant parameters show the similarity of synthetic and optical imaging in present-day experiments.

Authors:
; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
821514
Report Number(s):
PPPL-3914
TRN: US0400813
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 16 Jan 2004
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCURACY; DOUBLET-3 DEVICE; FLUCTUATIONS; GEOMETRY; PLASMA; SIMULATION; TURBULENCE; COMPUTER SIMULATION; MICROWAVES

Citation Formats

Kramer, G J, Nazikian, R, and Valeo, E. Simulation of Optical and Synthetic Imaging using Microwave Reflectometry. United States: N. p., 2004. Web. doi:10.2172/821514.
Kramer, G J, Nazikian, R, & Valeo, E. Simulation of Optical and Synthetic Imaging using Microwave Reflectometry. United States. https://doi.org/10.2172/821514
Kramer, G J, Nazikian, R, and Valeo, E. 2004. "Simulation of Optical and Synthetic Imaging using Microwave Reflectometry". United States. https://doi.org/10.2172/821514. https://www.osti.gov/servlets/purl/821514.
@article{osti_821514,
title = {Simulation of Optical and Synthetic Imaging using Microwave Reflectometry},
author = {Kramer, G J and Nazikian, R and Valeo, E},
abstractNote = {Two-dimensional full-wave time-dependent simulations in full plasma geometry are presented which show that conventional reflectometry (without a lens) can be used to synthetically image density fluctuations in fusion plasmas under conditions where the parallel correlation length greatly exceeds the poloidal correlation length of the turbulence. The advantage of synthetic imaging is that the image can be produced without the need for a large lens of high optical quality, and each frequency that is launched can be independently imaged. A particularly simple arrangement, consisting of a single receiver located at the midpoint of a microwave beam propagating along the plasma midplane is shown to suffice for imaging purposes. However, as the ratio of the parallel to poloidal correlation length decreases, a poloidal array of receivers needs to be used to synthesize the image with high accuracy. Simulations using DIII-D relevant parameters show the similarity of synthetic and optical imaging in present-day experiments.},
doi = {10.2172/821514},
url = {https://www.osti.gov/biblio/821514}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 16 00:00:00 EST 2004},
month = {Fri Jan 16 00:00:00 EST 2004}
}