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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10.1063/1.1141564

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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",

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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.

UR - https://www.scopus.com/pages/publications/5844257039

UR - https://www.scopus.com/pages/publications/5844257039#tab=citedBy

U2 - 10.1063/1.1141564

DO - 10.1063/1.1141564

M3 - Article

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SN - 0034-6748

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

Abstract

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