Soft X-ray computer tomography of sawtooth collapse associated with m=2 and m=3 modes with five detector arrays on the WT-3 Tokamak

Author

Yoshimura, Satoru ; Sukegawa, Mitsunari ; Maekawa, Takashi ; Terumichi, Yasushi

Author_Institution

Sci. & Technol. Center for Atoms, Osaka Univ., Japan

Volume

33

Issue

2

fYear

2005

fDate

4/1/2005 12:00:00 AM

Firstpage

444

Lastpage

445

Abstract

Another kind of sawtooth collapse is observed in a lower hybrid current drive plasma on the WT-3 tokamak. The internal structure of the plasma is investigated using computer tomography with five soft X-ray detector arrays after the application of the singular value decomposition to the soft X-ray detector signals. It is found that the precursor and postcursor oscillations of this collapse are the m=3 mode and the m=2 mode, respectively.

Keywords

Tokamak devices; plasma diagnostics; plasma oscillations; plasma toroidal confinement; plasma transport processes; sawtooth instability; WT-3 tokamak; lower hybrid current drive plasma; plasma internal structure; plasma modes; postcursor oscillation; precursor oscillation; sawtooth collapse; singular value decomposition; soft X-ray computer tomography; soft X-ray detector arrays; Application software; Plasma applications; Plasma x-ray sources; Sensor arrays; Signal detection; Singular value decomposition; Tokamaks; Tomography; X-ray detection; X-ray detectors; Computer tomography; sawtooth collapse; singular value decomposition; tokamak;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2005.845134

Filename

1420518