Plasma and Fusion Research

Volume 18, 1406029 (2023)

Regular Articles

Low Electric Field Drift Tube Ion Mobility Analysis for Atmospheric Pressure Plasma
Keith Nealson M. PENADO, Allen Vincent B. CATAPANG and Motoi WADA
Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
(Received 18 February 2023 / Accepted 14 March 2023 / Published 27 April 2023)

Abstract

A low voltage compact ion mobility spectrometer type charged particle analyzer is being investigated to test the performance for diagnostics of ion/electron transport in an atmospheric pressure environment. The 44 mm diameter, 53 mm long device consists of a mesh gated shutter, a 35 mm long drift region, and an end-plate detector. By applying a cyclic positive bias followed by a negative bias to the shutter region, subsequent attraction and expulsion of charged species is observed with the applied voltage less than 100 V. Mesh size dependence of the shutter gated current at the detector shows that across 0, 30, 100, and 200 mesh sizes, the 30 mesh size realized the transport of the most number of ions towards the detector. This mesh size also presents a well-defined current-time derivative which allows the measurement of ion mobilities in electric fields with the intensity less than 33.3 V/cm. Analysis of peaks observed after the onset of the positive phase shows the presence of O+ ions in the swarm with a reported experimental mobility of K0 = 2.97 cm2/Vs.

Keywords

ion mobility spectrometry, plasma diagnostics, atmospheric pressure plasma

DOI: 10.1585/pfr.18.1406029

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