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

Santhosh T.A. Kumar, Boyd D. Blackwell, Jeffrey H. Harris

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

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 δ∼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.

Original languageEnglish
Article number013501
JournalReview of Scientific Instruments
Volume78
Issue number1
DOIs
StatePublished - 2007

Funding

The authors would like to thank John Wach for his technical help in fabricating the electron gun and for H-1 operation. They also thank Mark Gwynneth for developing the motor drive and LABVIEW control and data acquisition code for the standard and fast mapping system. This work was performed on the H-1NF National Plasma Fusion Research Facility established by the Australian Government, and operated by the Australian National University, with support from the Australian Research Council Grant No. DP0344361.

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