Stabilizing effect of a nonresonant radio frequency drive on the m=1 diocotron instability
- INFN, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy and Dipartimento di Fisica, Universita degli Studi di Milano, Via Celoria 16, 20133 Milano (Italy)
It has been experimentally shown that the rotation radius of a non-neutral plasma column around the longitudinal axis of a Malmberg-Penning trap experiences a growth in amplitude (m=1 diocotron instability), leading to the loss of the plasma on the surface of the confining electrodes. A new stabilization mechanism has been investigated with the help of systematic experiments in the ELTRAP (ELectron TRAP) device where a high-frequency, low-amplitude drive has been applied on an azimuthally sectored electrode. An effective confining force is created, which reduces the offset of the column from the center. This interpretation and its theoretical analysis show a qualitative agreement with the experimental findings, where a net confinement effect is present for a wide range of drive amplitudes and frequencies.
- OSTI ID:
- 21537261
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 18; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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