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Low-power radio-frequency excitation as a plasma source in a Penning–Malmberg trap: a systematic study

Part of: Complex Plasma Phenomena

Published online by Cambridge University Press:  13 July 2015

G. Maero ,
S. Chen ,
R. Pozzoli  and
M. Romé
G. Maero*
Affiliation:
Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy INFN Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
S. Chen
Affiliation:
INFN Sezione di Milano, Via Celoria 16, 20133 Milano, Italy Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China
R. Pozzoli
Affiliation:
Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy INFN Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
M. Romé
Affiliation:
Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy INFN Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
*
†Email address for correspondence: giancarlo.maero@unimi.it
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Abstract

A novel method was experimentally demonstrated to produce a low-density electron plasma in a Penning–Malmberg trap, exploiting the static electric and magnetic confinement fields together with a periodic excitation with amplitudes as low as 0.5–5 V and frequencies in the MHz range. This unusual technique proved to be applicable as a replacement for conventional electron sources in Penning devices and presents interesting aspects both in terms of basic science and technological applications. Nevertheless, the experimental observations demonstrate the high sensitivity of plasma features of interest (charge, mean density and density distribution) to the experimental conditions, namely trap configuration and excitation parameters, and as a consequence clear trends have not been identified so far. We present an experimental campaign of measurements where several parameters were systematically changed leading to a better assessment of the plasma production mechanism and to the identification of common trends.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 5 , October 2015 , 495810503
Copyright
© Cambridge University Press 2015 

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