Abstract
The Pseudospark Transient Hollow Cathode Discharge (THCD) is a high‐voltage low‐pressure discharge, which is characterized by an axial hollow cathode electrode. This work presents optical and electric experimental diagnostics in the final stage of THCD in Hydrogen gas at working pressure between 100 mTorr and 250 mTorr. The characteristic signals of the electron and ion beam emission, growing plasma diagnosed by means of the Hα light emission at 656 nm from a point behind the cathode aperture, and the arrival to the cathode of the moving virtual anode are temporal and spatial correlated with the ICCD image of the growing plasma in the Hollow Cathode Region (HCR), and compared with our previous results. A performed statistical method lead us to suggest a sequence of ionization growth events which is analyzed to understand the mechanisms involved in the final stages just before breakdown.
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