Wire tomography in the H-1NF heliac for investigation of fine structure of magnetic islands

Journal Article · Mon Jan 15 04:00:00 EST 2007 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2424453· OSTI ID:20953236

Kumar, Santhosh T. A.; Blackwell, Boyd D; Harris, Jeffrey H ^[1]

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1. Plasma Research Laboratory, Research School of Physical Sciences and Engineering, The Australian National University, Canberra ACT 0200 (Australia)

Electron beam wire tomography in the H-1NF heliac enables high resolution mapping of vacuum flux surfaces with minimal disruption of the plasma operations schedule. Recent experimental results have proven this technique to be a highly accurate and high resolution method for mapping vacuum magnetic islands. Islands of width as small as {delta}{approx}8 mm have been measured, providing estimates of the internal rotational transform of the island. Point-to-point comparison of the mapping results with computer tracing, in conjunction with an image warping technique, enables systematic exploration of magnetic islands and surfaces of interest. Recent development of a fast mapping technique significantly reduced the mapping time and made this technique suitable for mapping at higher magnetic fields. This article presents recent experimental results and associated techniques.

• OSTI ID: 20953236
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 1 Vol. 78; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM-PLASMA SYSTEMS
COMPARATIVE EVALUATIONS
ELECTRON BEAMS
MAGNETIC FIELDS
MAGNETIC ISLANDS
MAGNETIC SURFACES
MAGNETOHYDRODYNAMICS
MAPPING
PLASMA
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
ROTATIONAL TRANSFORM
STELLARATORS
TOMOGRAPHY