Abstract
Strongly intermittent turbulence is observed in the shadow of a limiter in the large plasma device at UCLA [W. Gekelman, Rev. Sci. Instrum. 62, 2875 (1991)]. The amplitude probability distribution function of the turbulence is strongly skewed, with density depletion events (or "holes") dominant in the high-density region and density-enhancement events (or "blobs") dominant in the low-density region. Two-dimensional cross-conditional averaging shows that the blobs are detached, outward-propagating filamentary structures with a clear dipolar potential, while the holes appear to be part of a more extended turbulent structure. A statistical study of the blobs reveals a typical size of ten times the ion sound gyroradius and a typical velocity of one-tenth the sound speed.
| Original language | English |
|---|---|
| Article number | 010701 |
| Pages (from-to) | 1-4 |
| Number of pages | 4 |
| Journal | Physics of Plasmas |
| Volume | 13 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 2006 |
| Externally published | Yes |
Funding
The experiments reported in the paper were performed using the UCLA Basic Plasma Science Facility, which is funded by NSF and DOE. This work was supported by a DOE Fusion Energy Sciences postdoctoral fellowship and by DOE Grant No. DE-FG02-02ER54688.
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