Spatially resolved characterization of electrostatic fluctuations in the scrape-off layer of the CASTOR tokamak
The poloidal distribution of turbulence in the scrape-off layer (SOL) of the CASTOR tokamak is studied by means of a ring of 32 electric probes covering the whole perimeter of the poloidal cross section. Analysis of floating potential fluctuations in a SOL created in the top part of the machine by shifting the plasma downwards reveals a dominant periodic structure that propagates poloidally in the direction of the E(r) x B drift. Its poloidal mode number is found to be equal to the local safety factor q. Correlation and pulse propagation analyses show that this high m mode is a signature of a single long flute-like structure that is aligned with the magnetic field and snakes around the torus several times before terminating on the limiter.
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion 47 (2005), pp. 269-280
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1088/0741-3335/47/2/005
Record Number: 200719073 / Last updated on: 2007-04-11
Original language: en
Available languages: en