Observation of Edge Plasma Fluctuations with a Fast Camera in Heliotron J
Abstract
A fast video camera is verified to be a powerful tool for observation of filaments/blobs near the last closed flux surface (LCFS). In order to extract the fluctuation component from the raw data of the fast camera, a pre-processing technique, sliding time window averaging subtraction (STWAS) has been developed to remove the background of slowly varying emission from the bulk plasma. By using this pre-processing technique, the fast camera data are analyzed. A method to identify the filaments in the pre-processed image is also discussed.
- Publication:
-
Plasma Science and Technology
- Pub Date:
- March 2013
- DOI:
- 10.1088/1009-0630/15/3/04
- Bibcode:
- 2013PlST...15..213Z