A phase contrast imaging–interferometer system for detection of multiscale electron density fluctuations on DIII-D

Davis, E. M.; Rost, J. C.; Porkolab, M.; Marinoni, A.; Van Zeeland, M. A.

doi:10.1063/1.4960727

A phase contrast imaging–interferometer system for detection of multiscale electron density fluctuations on DIII-D

Journal Article · Mon Aug 15 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4960727· OSTI ID:1371887

^[1]; ^[2]; Porkolab, M. ^[2]; Marinoni, A. ^[2]; Van Zeeland, M. A. ^[3]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; General Atomics
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
General Atomics, San Diego, CA (United States)

Heterodyne interferometry and phase contrast imaging (PCI) are robust, mature techniques for measuring low-k and high-k electron density fluctuations, respectively. Here, we describe the first-ever implementation of a combined PCI-interferometer. The combined system uses a single 10:6 μm probe beam, two interference schemes, and two detectors to measure electron density uctuations at large spatiotemporal bandwidth (10 kHz < f < 5MHz and 0 cm^-1 ≤ k ≤ 20 cm^-1), allowing simultaneous measurement of ion- and electron-scale instabilities. Further, correlating our interferometer's measurements with those from DIII-D's pre-existing, toroidally separated interferometer allows core-localized, low-n MHD studies that may otherwise be inaccessible via external magnetic measurements. In the combined diagnostic's small port requirements and minimal access restrictions make it well-suited to the harsh neutron environments and limited port space expected in next-step devices.

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: FC02-04ER54698; FC02-99ER54512; FG02-94ER54235

OSTI ID:: 1371887

Alternate ID(s):: OSTI ID: 22596498

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 87; ISSN 0034-6748; ISSN RSINAK

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

References (9)

Principles of Plasma Diagnostics Hutchinson, I. H. https://doi.org/10.1017/CBO9780511613630	book	January 2009
CO ₂ laser scintillation interferometer for the measurement of density fluctuations in plasma confinement devices Nazikian, R.; Sharp, L. E. Review of Scientific Instruments, Vol. 58, Issue 11 https://doi.org/10.1063/1.1139468	journal	November 1987
Real‐time, vibration‐compensated CO ₂ interferometer operation on the DIII‐D tokamak Carlstrom, T. N.; Ahlgren, D. R.; Crosbie, J. Review of Scientific Instruments, Vol. 59, Issue 7 https://doi.org/10.1063/1.1139726	journal	July 1988
Effects of limited spatial resolution on fluctuation measurements (invited) Bravenec, R. V.; Wootton, A. J. Review of Scientific Instruments, Vol. 66, Issue 1 https://doi.org/10.1063/1.1146226	journal	January 1995
Phase error correction method for a vibration compensated interferometer Van Zeeland, M. A.; Carlstrom, T. N. Review of Scientific Instruments, Vol. 75, Issue 10 https://doi.org/10.1063/1.1786641	journal	October 2004
Localized measurement of short wavelength plasma fluctuations with the DIII-D phase contrast imaging diagnostic Dorris, J. R.; Rost, J. C.; Porkolab, M. Review of Scientific Instruments, Vol. 80, Issue 2 https://doi.org/10.1063/1.3065094	journal	February 2009
Correction to the Updated Edlén Equation for the Refractive Index of Air Birch, K. P.; Downs, M. J. Metrologia, Vol. 31, Issue 4 https://doi.org/10.1088/0026-1394/31/4/006	journal	January 1994
Alfvén eigenmode observations on DIII-D via two-colour CO ₂ interferometry Zeeland, M. A. Van; Kramer, G. J.; Nazikian, R. Plasma Physics and Controlled Fusion, Vol. 47, Issue 9 https://doi.org/10.1088/0741-3335/47/9/L01	journal	August 2005
Phase contrast imaging of waves and instabilities in high temperature magnetized fusion plasmas Porkolab, M.; Rost, J. C.; Basse, N. IEEE Transactions on Plasma Science, Vol. 34, Issue 2 https://doi.org/10.1109/TPS.2006.872181	journal	April 2006

Cited By (1)

A combined phase contrast imaging and heterodyne interferometer system for multiscale fluctuation measurements (invited) Davis, E. M.; Rost, J. C.; Porkolab, M. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5035413	journal	October 2018

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