A combined phase contrast imaging and heterodyne interferometer system for multiscale fluctuation measurements (invited)

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

doi:10.1063/1.5035413

A combined phase contrast imaging and heterodyne interferometer system for multiscale fluctuation measurements (invited)

Journal Article · Thu Jul 26 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5035413· OSTI ID:1609192

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

MIT Plasma Science and Fusion Center, Cambridge, MA (United States); DOE/OSTI
MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
General Atomics, San Diego, CA (United States)

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 < |k_R| ≤ 25 cm^-1) fluctuations with sensitivity 3×10¹³ m^-2/$$\sqrt{kHz}$$, while the interferometer simultaneously measures low-k (|k_R| < 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 T_e ~ T_i regime. Lastly, via correlation with the primary DIII-D interferometer, the toroidal mode numbers of core-localized MHD can be measured.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (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:: 1609192

Alternate ID(s):: OSTI ID: 1461728

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 89; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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