A combined Phase Contrast Imaging and heterodyne interferometer for multiscale fluctuation measurements in tokamak plasmas

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

doi:10.1088/1748-0221/14/12/c12023

A combined Phase Contrast Imaging and heterodyne interferometer for multiscale fluctuation measurements in tokamak plasmas

Journal Article · Tue Dec 24 00:00:00 EST 2019 · Journal of Instrumentation

DOI:https://doi.org/10.1088/1748-0221/14/12/c12023· OSTI ID:1602276

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

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

An upgrade to the Phase Contrast Imaging (PCI) diagnostic on the DIII-D tokamak has successfully combined PCI with density interferometry to provide electron density fluctuation measurements across an unprecedented range in wavenumber. The combined diagnostic uses a single laser and a single beam path through the tokamak, minimizing machine resources in anticipation of future reactor-scale devices where port access will be at a premium. The PCI multichannel detector provides low-noise, wavenumber-resolved detection of moderate-wavenumber turbulence, while the interferometer channel is sensitive to long-wavelength turbulence, including the peak of ion-scale turbulence and MHD. The overlap in wavenumber range between the two schemes allows for an in situ absolute calibration of the PCI.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: FC02-04ER54698; FC02-99ER54512; FG02-94ER54235; SC0016154

OSTI ID:: 1602276

Alternate ID(s):: OSTI ID: 22891474

Journal Information:: Journal of Instrumentation, Journal Name: Journal of Instrumentation Journal Issue: 12 Vol. 14; ISSN 1748-0221

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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