A combined phase contrast imaging and heterodyne interferometer system for multiscale fluctuation measurements on DIII-D
Name
1036985497-MIT.pdf
Description
Full printable version
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9.53 MB
Format
Adobe PDF
Checksum (MD5)
f974c6a5cc8da056532400454816b47d
Author(s)
Davis, Evan Michael
Advisor(s)
Miklos Porkolab.
Date Issued
2018
Publisher
Massachusetts Institute of Technology
Abstract
A novel combined diagnostic capable of measuring multiscale density fluctuations that extend from magnetohydrodynamic (MHD) scales to the lower bound of the electron temperature gradient (ETG) mode has been designed, installed, and operated at the DIII-D tokamak. The combined diagnostic was constructed by adding a heterodyne interferometer to the pre-existing phase contrast imaging (PCI) system, both of which measure line-integrated electron-density fluctuations. The port-space footprint is minimized by using a single 10.6 pm CO2 laser and a single beampath. With temporal bandwidths in excess of 1 MHz, the PCI measures high-k (1.5 cm-1 < k +/
Description
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references.
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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