Ultrafast spectroscopy diagnostic to measure localized ion temperature and toroidal velocity fluctuations

I. U. Uzun-Kaymak; R. J. Fonck; G. R. McKee; N. Schoenbeck; D. Smith; G. Winz; Z. Yan

doi:10.1063/1.3479114

Ultrafast spectroscopy diagnostic to measure localized ion temperature and toroidal velocity fluctuations

I. U. Uzun-Kaymak, R. J. Fonck, G. R. McKee, N. Schoenbeck, D. Smith, G. Winz, Z. Yan

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

A dual-channel high-efficiency, high-throughput custom spectroscopic system has been designed and implemented at DIII-D to measure localized ion thermal fluctuations associated with drift wave turbulence. A large-area prism-coupled transmission grating and high-throughput collection optics are employed to observe C VI emission centered near λ=529 nm. The diagnostic achieves 0.25 nm resolution over a 2.0 nm spectral band via eight discrete spectral channels. A turbulence-relevant time resolution of 1 μs is achieved using cooled high-speed avalanche photodiodes and ultralow-noise preamplifiers. The system sensitivity is designed to provide measurements of normalized ion temperature fluctuations on the order of δ T_i/T_i 1%.

Original language	English (US)
Article number	10D714
Journal	Review of Scientific Instruments
Volume	81
Issue number	10
DOIs	https://doi.org/10.1063/1.3479114
State	Published - Oct 2010
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.3479114

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title = "Ultrafast spectroscopy diagnostic to measure localized ion temperature and toroidal velocity fluctuations",

abstract = "A dual-channel high-efficiency, high-throughput custom spectroscopic system has been designed and implemented at DIII-D to measure localized ion thermal fluctuations associated with drift wave turbulence. A large-area prism-coupled transmission grating and high-throughput collection optics are employed to observe C VI emission centered near λ=529 nm. The diagnostic achieves 0.25 nm resolution over a 2.0 nm spectral band via eight discrete spectral channels. A turbulence-relevant time resolution of 1 μs is achieved using cooled high-speed avalanche photodiodes and ultralow-noise preamplifiers. The system sensitivity is designed to provide measurements of normalized ion temperature fluctuations on the order of δ Ti/Ti 1\%.",

author = "Uzun-Kaymak, \{I. U.\} and Fonck, \{R. J.\} and McKee, \{G. R.\} and N. Schoenbeck and D. Smith and G. Winz and Z. Yan",

year = "2010",

month = oct,

doi = "10.1063/1.3479114",

language = "English (US)",

volume = "81",

journal = "Review of Scientific Instruments",

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publisher = "American Institute of Physics",

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T1 - Ultrafast spectroscopy diagnostic to measure localized ion temperature and toroidal velocity fluctuations

AU - Uzun-Kaymak, I. U.

AU - Fonck, R. J.

AU - McKee, G. R.

AU - Schoenbeck, N.

AU - Smith, D.

AU - Winz, G.

AU - Yan, Z.

PY - 2010/10

Y1 - 2010/10

N2 - A dual-channel high-efficiency, high-throughput custom spectroscopic system has been designed and implemented at DIII-D to measure localized ion thermal fluctuations associated with drift wave turbulence. A large-area prism-coupled transmission grating and high-throughput collection optics are employed to observe C VI emission centered near λ=529 nm. The diagnostic achieves 0.25 nm resolution over a 2.0 nm spectral band via eight discrete spectral channels. A turbulence-relevant time resolution of 1 μs is achieved using cooled high-speed avalanche photodiodes and ultralow-noise preamplifiers. The system sensitivity is designed to provide measurements of normalized ion temperature fluctuations on the order of δ Ti/Ti 1%.

AB - A dual-channel high-efficiency, high-throughput custom spectroscopic system has been designed and implemented at DIII-D to measure localized ion thermal fluctuations associated with drift wave turbulence. A large-area prism-coupled transmission grating and high-throughput collection optics are employed to observe C VI emission centered near λ=529 nm. The diagnostic achieves 0.25 nm resolution over a 2.0 nm spectral band via eight discrete spectral channels. A turbulence-relevant time resolution of 1 μs is achieved using cooled high-speed avalanche photodiodes and ultralow-noise preamplifiers. The system sensitivity is designed to provide measurements of normalized ion temperature fluctuations on the order of δ Ti/Ti 1%.

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DO - 10.1063/1.3479114

M3 - Article

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VL - 81

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 10

M1 - 10D714

ER -

Ultrafast spectroscopy diagnostic to measure localized ion temperature and toroidal velocity fluctuations

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