RT Journal Article
T1 Measured cathode fall characteristics depending on the diameter of a hydrogen hollow cathode discharge
A1 González Fernández, Verónica
A1 Grützmacher, Klaus
A1 Steiger, Andreas
A1 Pérez, Concha
A1 de la Rosa, Mª Inmaculada
AB In this work, Doppler-free two photon optogalvanic spectroscopy is used to measure the electric field strength in the cathode fall region of a hollow cathode discharge, operated in pure hydrogen, via the Stark splitting of the 2S level of atomic hydrogen. The cathode fall characteristics are analysed for various pressures and in a wide range of discharge currents. Tungsten is used as the cathode material, because it allows for reliable measurements in a fairly wide range of discharge conditions and because of its minimal sputtering. Two cathode diameters (10 mm and 15 mm) are used to study the dependence of the cathode fall on discharge geometry. The measurements reveal that the cathode fall characteristics are quite independent on the cathode diameter for equal cathode current density; hence the measurements can be used to test one dimensional modelling of the cathode fall region for low pressure hydrogen discharges using e.g. plane parallel electrodes.
PB IOP
SN 0963-0252
YR 2017
FD 2017
LK https://hdl.handle.net/20.500.14352/99210
UL https://hdl.handle.net/20.500.14352/99210
LA eng
NO Gonzalez-Fernandez et al 2017 Plasma Sources Sci. Technol. 26 105004
NO Received 5 April 2017, revised 20 August 2017; Accepted for publication 29 August 2017; Published 19 September 2017.
NO Ministerio de Economía y Competitividad (España)
DS Docta Complutense
RD 8 abr 2025