Active control of the ion resonance instability by ion removing fields

Journal Article · Wed Nov 15 00:00:00 EST 2006 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2363175· OSTI ID:20860351

Bettega, G; Cavaliere, F; Cavenago, M; De Luca, F; Illiberi, A; Pozzoli, R; Rome, M ^[1]

---

1. I.N.F.N. Sezione di Milano and Dipartimento di Fisica, Universita degli Studi di Milano, Via Celoria 16, I-20133 Milan (Italy)

The off-axis bulk rotation (l=1 diocotron mode) of an electron plasma column confined in a Malmberg-Penning trap is strongly destabilized by a small population of positive ions formed by energetic electron-neutral collisions. The instability, known as ion resonance instability, drives the plasma against the wall, destroying the confinement. A new experimental technique based on the static or time dependent application of low voltages to the inner conductors of the trap is shown to be effective in controlling the instability. The efficiency of the control technique is experimentally investigated by a systematic variation of the amplitudes, time duration, and periodicity of the additional potentials.

• OSTI ID: 20860351
• Journal Information: Physics of Plasmas, Vol. 13, Issue 11; Other Information: DOI: 10.1063/1.2363175; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AMPLITUDES
BEAM-PLASMA SYSTEMS
CATIONS
CONTROL
EFFICIENCY
ELECTRIC POTENTIAL
ELECTRON COLLISIONS
ION BEAMS
PERIODICITY
PLASMA
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
RESONANCE
ROTATION
TAIL ELECTRONS
TIME DEPENDENCE
TRAPS
WALL EFFECTS