Application of TFTR diagnostics to study of limiter H-modes

C. E. Bush; J. Schivell; G. Taylor; N. Bretz; A. Cavallo; E. Fredrickson; A. Janos; D. K. Mansfield; K. McGuire; R. Nazikian; H. Park; A. T. Ramsey; B. Stratton; E. J. Synakowski

doi:10.1063/1.1141564

Application of TFTR diagnostics to study of limiter H-modes

C. E. Bush, J. Schivell, G. Taylor, N. Bretz, A. Cavallo, E. Fredrickson, A. Janos, D. K. Mansfield, K. McGuire, R. Nazikian, H. Park, A. T. Ramsey, B. Stratton, E. J. Synakowski

Department of Physics

Princeton Plasma Physics Laboratory

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

1 Scopus citations

Abstract

Circular limiter H modes with centrally peaked density profiles have been obtained on TFTR. Diagnostics used to study these unique plasmas include arrays of D_α and Cii detectors, bolometers, and Mirnov coils; x-ray imaging, charge exchange recombination spectroscopy, ECE, microwave scattering systems, and a multichannel infrared interferometer. These diagnostics have special features which allow time and space-resolved measurements during the H-mode transition and during ELMs. Microwave scattering during the H phase shows a feature in the scattered spectrum which is consistent with a poloidal rotation in the electron diamagnetic drift direction. Mirnov coil data digitized at 2 MHz show an increase in high-frequency magnetic fluctuations (60-200 kHz) during an ELM, while ECE data show 20-30 μs intense emission spikes in the outer 15-20 cm of the plasma edge.

Original language	English
Pages (from-to)	3532-3535
Number of pages	4
Journal	Review of Scientific Instruments
Volume	61
Issue number	11
DOIs	https://doi.org/10.1063/1.1141564
State	Published - 1990

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title = "Application of TFTR diagnostics to study of limiter H-modes",

abstract = "Circular limiter H modes with centrally peaked density profiles have been obtained on TFTR. Diagnostics used to study these unique plasmas include arrays of Dα and Cii detectors, bolometers, and Mirnov coils; x-ray imaging, charge exchange recombination spectroscopy, ECE, microwave scattering systems, and a multichannel infrared interferometer. These diagnostics have special features which allow time and space-resolved measurements during the H-mode transition and during ELMs. Microwave scattering during the H phase shows a feature in the scattered spectrum which is consistent with a poloidal rotation in the electron diamagnetic drift direction. Mirnov coil data digitized at 2 MHz show an increase in high-frequency magnetic fluctuations (60-200 kHz) during an ELM, while ECE data show 20-30 μs intense emission spikes in the outer 15-20 cm of the plasma edge.",

author = "Bush, \{C. E.\} and J. Schivell and G. Taylor and N. Bretz and A. Cavallo and E. Fredrickson and A. Janos and Mansfield, \{D. K.\} and K. McGuire and R. Nazikian and H. Park and Ramsey, \{A. T.\} and B. Stratton and Synakowski, \{E. J.\}",

year = "1990",

doi = "10.1063/1.1141564",

language = "English",

volume = "61",

pages = "3532--3535",

number = "11",

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TY - JOUR

T1 - Application of TFTR diagnostics to study of limiter H-modes

AU - Bush, C. E.

AU - Schivell, J.

AU - Taylor, G.

AU - Bretz, N.

AU - Cavallo, A.

AU - Fredrickson, E.

AU - Janos, A.

AU - Mansfield, D. K.

AU - McGuire, K.

AU - Nazikian, R.

AU - Park, H.

AU - Ramsey, A. T.

AU - Stratton, B.

AU - Synakowski, E. J.

PY - 1990

Y1 - 1990

N2 - Circular limiter H modes with centrally peaked density profiles have been obtained on TFTR. Diagnostics used to study these unique plasmas include arrays of Dα and Cii detectors, bolometers, and Mirnov coils; x-ray imaging, charge exchange recombination spectroscopy, ECE, microwave scattering systems, and a multichannel infrared interferometer. These diagnostics have special features which allow time and space-resolved measurements during the H-mode transition and during ELMs. Microwave scattering during the H phase shows a feature in the scattered spectrum which is consistent with a poloidal rotation in the electron diamagnetic drift direction. Mirnov coil data digitized at 2 MHz show an increase in high-frequency magnetic fluctuations (60-200 kHz) during an ELM, while ECE data show 20-30 μs intense emission spikes in the outer 15-20 cm of the plasma edge.

AB - Circular limiter H modes with centrally peaked density profiles have been obtained on TFTR. Diagnostics used to study these unique plasmas include arrays of Dα and Cii detectors, bolometers, and Mirnov coils; x-ray imaging, charge exchange recombination spectroscopy, ECE, microwave scattering systems, and a multichannel infrared interferometer. These diagnostics have special features which allow time and space-resolved measurements during the H-mode transition and during ELMs. Microwave scattering during the H phase shows a feature in the scattered spectrum which is consistent with a poloidal rotation in the electron diamagnetic drift direction. Mirnov coil data digitized at 2 MHz show an increase in high-frequency magnetic fluctuations (60-200 kHz) during an ELM, while ECE data show 20-30 μs intense emission spikes in the outer 15-20 cm of the plasma edge.

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U2 - 10.1063/1.1141564

DO - 10.1063/1.1141564

M3 - Article

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VL - 61

SP - 3532

EP - 3535

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 11

ER -

Application of TFTR diagnostics to study of limiter H-modes

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