A combined phase contrast imaging and heterodyne interferometer system for multiscale fluctuation measurements (invited)
Abstract
In this work, a novel combined diagnostic capable of measuring multiscale density fluctuations that extend from magnetohydrodynamic (MHD) to the lower range of electron temperature gradient turbulence has been designed, installed, and operated at DIII-D. 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 via use of a single 10.6 μm probe beam. With temporal bandwidths in excess of 1 MHz, the PCI measures high-k (1.5 cm-1 < |kR| ≤ 25 cm-1) fluctuations with sensitivity 3×1013 m-2/$$\sqrt{kHz}$$, while the interferometer simultaneously measures low-k (|kR| < 5 cm-1) fluctuations with sensitivity 3×1014 m-2/$$\sqrt{kHz}$$. The intentional mid-k overlap has been empirically verified with sound-wave calibrations and allows quantitative investigation of multiscale effects that are predicted to be significant in the reactor-relevant Te ~ Ti regime. Lastly, via correlation with the primary DIII-D interferometer, the toroidal mode numbers of core-localized MHD can be measured.
- Authors:
-
- MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1609192
- Alternate Identifier(s):
- OSTI ID: 1461728
- Grant/Contract Number:
- FC02-04ER54698; FC02-99ER54512; FG02-94ER54235; NA002135
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Review of Scientific Instruments
- Additional Journal Information:
- Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; instruments & instrumentation; physics; interferometry; signal processing; plasma confinement; noise floor; multiscale methods; lasers; electron density; magnetohydrodynamics; turbulence measurement
Citation Formats
Davis, E. M., Rost, J. C., Porkolab, M., Marinoni, A., and Van Zeeland, M. A. A combined phase contrast imaging and heterodyne interferometer system for multiscale fluctuation measurements (invited). United States: N. p., 2018.
Web. doi:10.1063/1.5035413.
Davis, E. M., Rost, J. C., Porkolab, M., Marinoni, A., & Van Zeeland, M. A. A combined phase contrast imaging and heterodyne interferometer system for multiscale fluctuation measurements (invited). United States. https://doi.org/10.1063/1.5035413
Davis, E. M., Rost, J. C., Porkolab, M., Marinoni, A., and Van Zeeland, M. A. Thu .
"A combined phase contrast imaging and heterodyne interferometer system for multiscale fluctuation measurements (invited)". United States. https://doi.org/10.1063/1.5035413. https://www.osti.gov/servlets/purl/1609192.
@article{osti_1609192,
title = {A combined phase contrast imaging and heterodyne interferometer system for multiscale fluctuation measurements (invited)},
author = {Davis, E. M. and Rost, J. C. and Porkolab, M. and Marinoni, A. and Van Zeeland, M. A.},
abstractNote = {In this work, a novel combined diagnostic capable of measuring multiscale density fluctuations that extend from magnetohydrodynamic (MHD) to the lower range of electron temperature gradient turbulence has been designed, installed, and operated at DIII-D. 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 via use of a single 10.6 μm probe beam. With temporal bandwidths in excess of 1 MHz, the PCI measures high-k (1.5 cm-1 < |kR| ≤ 25 cm-1) fluctuations with sensitivity 3×1013 m-2/$\sqrt{kHz}$, while the interferometer simultaneously measures low-k (|kR| < 5 cm-1) fluctuations with sensitivity 3×1014 m-2/$\sqrt{kHz}$. The intentional mid-k overlap has been empirically verified with sound-wave calibrations and allows quantitative investigation of multiscale effects that are predicted to be significant in the reactor-relevant Te ~ Ti regime. Lastly, via correlation with the primary DIII-D interferometer, the toroidal mode numbers of core-localized MHD can be measured.},
doi = {10.1063/1.5035413},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Thu Jul 26 00:00:00 EDT 2018},
month = {Thu Jul 26 00:00:00 EDT 2018}
}
Web of Science
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