Low-noise, high-speed detector development for optical turbulence fluctuation measurements for NSTX

N. L. Schoenbeck; S. D. Ellington; R. J. Fonck; K. Jaehnig; G. R. McKee; D. Smith; I. U. Uzun-Kaymak; G. Winz

doi:10.1063/1.3483196

Low-noise, high-speed detector development for optical turbulence fluctuation measurements for NSTX

N. L. Schoenbeck, S. D. Ellington, R. J. Fonck, K. Jaehnig, G. R. McKee, D. Smith, I. U. Uzun-Kaymak, G. Winz

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

14 Scopus citations

Abstract

A new beam emission spectroscopy (BES) diagnostic is under development. Photon-noise limited measurements of neutral beam emissions are achieved using photoconductive photodiodes with a novel frequency-compensated broadband preamplifier. The new BES system includes a next-generation preamplifier and upgraded optical coupling system. Notable features of the design are surface-mount components, minimized stray capacitance, a wide angular acceptance photodiode, a differential output line driver, reduced input capacitance, doubling of the frequency range, net reduced electronic noise, and elimination of the need for a cryogenic cooling system. The irreducible photon noise dominates the noise up to 800 kHz for a typical input power of 60 nW. This new assembly is being integrated into an upgraded multichannel optical detector assembly for a new BES system on the NSTX experiment.

Original language	English (US)
Article number	10D718
Journal	Review of Scientific Instruments
Volume	81
Issue number	10
DOIs	https://doi.org/10.1063/1.3483196
State	Published - Oct 2010
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.3483196

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title = "Low-noise, high-speed detector development for optical turbulence fluctuation measurements for NSTX",

abstract = "A new beam emission spectroscopy (BES) diagnostic is under development. Photon-noise limited measurements of neutral beam emissions are achieved using photoconductive photodiodes with a novel frequency-compensated broadband preamplifier. The new BES system includes a next-generation preamplifier and upgraded optical coupling system. Notable features of the design are surface-mount components, minimized stray capacitance, a wide angular acceptance photodiode, a differential output line driver, reduced input capacitance, doubling of the frequency range, net reduced electronic noise, and elimination of the need for a cryogenic cooling system. The irreducible photon noise dominates the noise up to 800 kHz for a typical input power of 60 nW. This new assembly is being integrated into an upgraded multichannel optical detector assembly for a new BES system on the NSTX experiment.",

author = "Schoenbeck, \{N. L.\} and Ellington, \{S. D.\} and Fonck, \{R. J.\} and K. Jaehnig and McKee, \{G. R.\} and D. Smith and Uzun-Kaymak, \{I. U.\} and G. Winz",

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doi = "10.1063/1.3483196",

language = "English (US)",

volume = "81",

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T1 - Low-noise, high-speed detector development for optical turbulence fluctuation measurements for NSTX

AU - Schoenbeck, N. L.

AU - Ellington, S. D.

AU - Fonck, R. J.

AU - Jaehnig, K.

AU - McKee, G. R.

AU - Smith, D.

AU - Uzun-Kaymak, I. U.

AU - Winz, G.

PY - 2010/10

Y1 - 2010/10

N2 - A new beam emission spectroscopy (BES) diagnostic is under development. Photon-noise limited measurements of neutral beam emissions are achieved using photoconductive photodiodes with a novel frequency-compensated broadband preamplifier. The new BES system includes a next-generation preamplifier and upgraded optical coupling system. Notable features of the design are surface-mount components, minimized stray capacitance, a wide angular acceptance photodiode, a differential output line driver, reduced input capacitance, doubling of the frequency range, net reduced electronic noise, and elimination of the need for a cryogenic cooling system. The irreducible photon noise dominates the noise up to 800 kHz for a typical input power of 60 nW. This new assembly is being integrated into an upgraded multichannel optical detector assembly for a new BES system on the NSTX experiment.

AB - A new beam emission spectroscopy (BES) diagnostic is under development. Photon-noise limited measurements of neutral beam emissions are achieved using photoconductive photodiodes with a novel frequency-compensated broadband preamplifier. The new BES system includes a next-generation preamplifier and upgraded optical coupling system. Notable features of the design are surface-mount components, minimized stray capacitance, a wide angular acceptance photodiode, a differential output line driver, reduced input capacitance, doubling of the frequency range, net reduced electronic noise, and elimination of the need for a cryogenic cooling system. The irreducible photon noise dominates the noise up to 800 kHz for a typical input power of 60 nW. This new assembly is being integrated into an upgraded multichannel optical detector assembly for a new BES system on the NSTX experiment.

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ER -

Low-noise, high-speed detector development for optical turbulence fluctuation measurements for NSTX

Abstract

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