Breakdown transient study of plasma distributions in a 2.45 GHz hydrogen discharge

Correlations between density distributions, optical spectra, and ion species in a hydrogen plasma (invited)

“…9,10 The measurements clearly show that Balmer-α emission could be used as a representative signal of proton population in the plasma and the Fulcher band signal as a representative indication of molecular H + 2 and H + 3 ions' production. Moreover, the influence of the plasma distributions on the current species and its ratios is also demonstrated.…”

“…The study was carried out covering the full range of operation parameters where stable plasma distributions (Column, Hourglass, Slug, Fullchamber, Ring, Flower, YinYang, and Donut) are created and mainly determined by the magnetic field profile as previously reported. 8,9 Pictures obtained with a regular camera are included in the following figures to facilitate the association with the corresponding plasma distributions. Incoming and reflected microwave powers were also measured to include the coupling characteristics.…”

“…6,7 Several plasma distributions where visible light emission suggests different dynamics of the H + , H + 2 , and H + 3 populations have been reported. 8,9 Thus, visible light spectroscopy has been recently proposed as a non-invasive qualitative diagnostic for monitoring the plasma species fraction during ion source operation in a 2.45 GHz hydrogen plasma discharge. 10 We report herein a study of the H + , H + 2 , and H + 3 current correlated with visible filtered, Balmer-α and Fulcher band emissions, and plasma distributions recently observed.…”

The relationship between visible light emission and species fraction of the hydrogen ion beams extracted from 2.45 GHz microwave discharge

“…9,12,13 The present system allows to measure the ion species current evolutions of H + , H + 2 , and H + 3 and directly to compare them with simultaneous optical measurements. The measurements shown in Figs.…”

“…9,13 In addition, the use of this diagnostics as a simple and direct research tool could permit a rapid and inexpensive way to study and optimize new designs of hydrogen plasma sources for special applications, i.e., where molecular ion production is pursued.…”