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New probe array for edge radial transport measurement in the Collisionless Terrella Experiment

Author: Aaron M. Senter
Requested Type: Poster Only
Submitted: 2009-12-04 14:54:17

Co-authors: M.W. Worstell, M.E. Mauel

Contact Info:
Columbia University
500 W. 120th St.
New York, NY   10027
USA

Abstract Text:
The Collisionless Terella Experiment (CTX) is a mechanically supported dipole confinement experiment aimed to understand the physics of strong interchange transport. Theoretical investigations predict the formation of large scale convective vortices driven by E x B motion [1], and these structures have been observed experimentally [2]. To directly measure the temporal and spatial characteristics of the transport, we are constructing a 47-probe array. This array will add edge potential and density fluctuation measurements to our existing measurements of global plasma dynamics measured with our polar imaging diagnostic and high-speed camera. The new array will span 90 degrees of the azimuthal angle. 24 floating potential probes will be evenly spaced along the arc and between each pair of probes will be an ion saturation probe. The floating potential probe measurements will give the electric field, while the ion saturation probes will give the density. Combining these measurements with the magnetic field we will be able to directly measure edge radial transport and correlate this transport with global plasma dynamics.

[1] V. Pastukhov and N. Chudin, Plasma Physics Reports 27, 907 (2001).
[2] Grierson et al., Phys Plasmas, 16, 055902 (2009).

Characterization: A5,E4

Comments:
Please place with other Dipole Experimental Posters: Sorting order is 1) Garnier, 2) Kesner, 3) Davis, 4) Woskov, 5) Kardon, 6) Worstell, 7) Senter