Fast soft x-ray images of magnetohydrodynamic phenomena in NSTX

Journal Article · Wed Oct 15 00:00:00 EDT 2008 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2968219· OSTI ID:21266588

Bush, C E ^[1]; Stratton, B C; Robinson, J; Zakharov, L E; Fredrickson, E D ^[2]; Stutman, D; Tritz, K ^[3]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
3. Johns Hopkins University, Baltimore, Maryland 21218 (United States)

A variety of magnetohydrodynamic (MHD) phenomena have been observed on NSTX. Many of these affect fast particle losses, which are of major concern for future burning plasma experiments. Usual diagnostics for studying these phenomena are arrays of Mirnov coils for magnetic oscillations and p-i-n diode arrays for soft x-ray emission from the plasma core. Data reported here are from a unique fast soft x-ray imaging camera (FSXIC) with a wide-angle (pinhole) tangential view of the entire plasma minor cross section. The camera provides a 64x64 pixel image, on a charge coupled device chip, of light resulting from conversion of soft x rays incident on a phosphor to the visible. We have acquired plasma images at frame rates of 1-500 kHz (300 frames/shot) and have observed a variety of MHD phenomena: disruptions, sawteeth, fishbones, tearing modes, and edge localized modes (ELMs). New data including modes with frequency >90 kHz are also presented. Data analysis and modeling techniques used to interpret the FSXIC data are described and compared, and FSXIC results are compared to Mirnov and p-i-n diode array results.

• OSTI ID: 21266588
• Journal Information: Review of Scientific Instruments, Vol. 79, Issue 10; Conference: HTPD08: 17. topical conference on high-temperature plasma diagnostics, Albuquerque, NM (United States), 11-15 May 2008; Other Information: DOI: 10.1063/1.2968219; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CAMERAS
CHARGE-COUPLED DEVICES
CROSS SECTIONS
DATA ANALYSIS
EDGE LOCALIZED MODES
IMAGES
KHZ RANGE
MAGNETOHYDRODYNAMICS
NSTX DEVICE
PLASMA
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
SAWTOOTH OSCILLATIONS
SIMULATION
SOFT X RADIATION
TEARING INSTABILITY