Fast Imaging of Blob Motion in TORPEX Plasmas

Author

Iraji, Davoud ; Furno, Ivo ; Fasoli, Ambrogio

Author_Institution

Centre de Rech. en Phys. des Plasmas, Ecole Polytech. Fed. de Lausanne, Lausanne, Switzerland

Volume

39

Issue

11

fYear

2011

Firstpage

3010

Lastpage

3011

Abstract

To complement electrostatic probe measurements of plasma turbulence and study plasma structures with high spatial resolution, a nonperturbative direct imaging system has been developed on TORPEX. This system includes a fast framing Photron-APX-RS camera and a fast gated image intensifier unit. Fast camera movies are acquired at a 150 thousand frames/s frame rate and 2 μs of exposure time. The plasma emissivity profile is tomographically reconstructed from the tangentially viewed image. Conditional average sampling is then applied to visualize and measure the size of structures associated with interchange modes as well as blobs in TORPEX plasmas.

Keywords

plasma diagnostics; plasma transport processes; plasma turbulence; TORPEX plasma; blob motion imaging; electrostatic probe measurement; fast framing photron-APX-RS camera; image intensifler unit; nonperturbative direct imaging system; plasma emissivity profile; plasma structure; plasma turbulence; spatial resolution; tangentially-viewed image; Cameras; Image reconstruction; Magnetic recording; Magnetic resonance imaging; Plasmas; Toroidal magnetic fields; Blob; TORPEX; fast visible imaging; tomographic reconstruction;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2011.2159025

Filename

5934602