Enhanced sensitivity beam emission spectroscopy system for nonlinear turbulence measurements

Deepak K. Gupta; Raymond J. Fonck; George R. McKee; David J. Schlossberg; Morgan W. Shafer

doi:10.1063/1.1787951

Enhanced sensitivity beam emission spectroscopy system for nonlinear turbulence measurements

Deepak K. Gupta, Raymond J. Fonck, George R. McKee, David J. Schlossberg, Morgan W. Shafer

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

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Abstract

An upgraded beam emission spectroscopy (BES) system has been deployed to access low amplitude turbulence regions near internal transport barriers on the DIII-D tokamak. Sixteen high sensitivity channels are being installed. A significant increase in total signal to noise is achieved by: (1) Increased spatial volume sampling tailored to known turbulence characteristics; (2) An increased throughput spectrometer assembly to isolate the local beam fluorescence, coupled to new large area photoconductive photodiodes; (3) A new sharp edge interference filter designed to optimize detection of the beam emission plus a significant fraction of the thermal deuterium charge exchange. A new data acquisition system has been installed, providing an eight times increase in integration time or an increased sample rate. Preliminary results from the upgraded system show a signal enhancement of greater than an order of magnitude. A clear broadband density fluctuation signal is observed in H-mode discharges with the upgraded BES system, demonstrating the significant performance enhancement.

Original language	English
Pages (from-to)	3493-3495
Number of pages	3
Journal	Review of Scientific Instruments
Volume	75
Issue number	10 II
DOIs	https://doi.org/10.1063/1.1787951
State	Published - Oct 2004
Externally published	Yes

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10.1063/1.1787951

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title = "Enhanced sensitivity beam emission spectroscopy system for nonlinear turbulence measurements",

abstract = "An upgraded beam emission spectroscopy (BES) system has been deployed to access low amplitude turbulence regions near internal transport barriers on the DIII-D tokamak. Sixteen high sensitivity channels are being installed. A significant increase in total signal to noise is achieved by: (1) Increased spatial volume sampling tailored to known turbulence characteristics; (2) An increased throughput spectrometer assembly to isolate the local beam fluorescence, coupled to new large area photoconductive photodiodes; (3) A new sharp edge interference filter designed to optimize detection of the beam emission plus a significant fraction of the thermal deuterium charge exchange. A new data acquisition system has been installed, providing an eight times increase in integration time or an increased sample rate. Preliminary results from the upgraded system show a signal enhancement of greater than an order of magnitude. A clear broadband density fluctuation signal is observed in H-mode discharges with the upgraded BES system, demonstrating the significant performance enhancement.",

author = "Gupta, {Deepak K.} and Fonck, {Raymond J.} and McKee, {George R.} and Schlossberg, {David J.} and Shafer, {Morgan W.}",

year = "2004",

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doi = "10.1063/1.1787951",

language = "English",

volume = "75",

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journal = "Review of Scientific Instruments",

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T1 - Enhanced sensitivity beam emission spectroscopy system for nonlinear turbulence measurements

AU - Gupta, Deepak K.

AU - Fonck, Raymond J.

AU - McKee, George R.

AU - Schlossberg, David J.

AU - Shafer, Morgan W.

PY - 2004/10

Y1 - 2004/10

N2 - An upgraded beam emission spectroscopy (BES) system has been deployed to access low amplitude turbulence regions near internal transport barriers on the DIII-D tokamak. Sixteen high sensitivity channels are being installed. A significant increase in total signal to noise is achieved by: (1) Increased spatial volume sampling tailored to known turbulence characteristics; (2) An increased throughput spectrometer assembly to isolate the local beam fluorescence, coupled to new large area photoconductive photodiodes; (3) A new sharp edge interference filter designed to optimize detection of the beam emission plus a significant fraction of the thermal deuterium charge exchange. A new data acquisition system has been installed, providing an eight times increase in integration time or an increased sample rate. Preliminary results from the upgraded system show a signal enhancement of greater than an order of magnitude. A clear broadband density fluctuation signal is observed in H-mode discharges with the upgraded BES system, demonstrating the significant performance enhancement.

AB - An upgraded beam emission spectroscopy (BES) system has been deployed to access low amplitude turbulence regions near internal transport barriers on the DIII-D tokamak. Sixteen high sensitivity channels are being installed. A significant increase in total signal to noise is achieved by: (1) Increased spatial volume sampling tailored to known turbulence characteristics; (2) An increased throughput spectrometer assembly to isolate the local beam fluorescence, coupled to new large area photoconductive photodiodes; (3) A new sharp edge interference filter designed to optimize detection of the beam emission plus a significant fraction of the thermal deuterium charge exchange. A new data acquisition system has been installed, providing an eight times increase in integration time or an increased sample rate. Preliminary results from the upgraded system show a signal enhancement of greater than an order of magnitude. A clear broadband density fluctuation signal is observed in H-mode discharges with the upgraded BES system, demonstrating the significant performance enhancement.

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DO - 10.1063/1.1787951

M3 - Article

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JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 10 II

ER -

Enhanced sensitivity beam emission spectroscopy system for nonlinear turbulence measurements

Abstract

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