Experimental and Theoretical Study of Flow Dynamics of Expanding Hydrogen Plasma from an ECR Plasma Source
Abstract
The flow of moderately dense (n {\approx} 10^{11} cm^{-3}) hydrogen plasma with high electron temperature (T_{e} {\approx} 30 - 35 eV) and plasma potential (V_{p} {\approx} 100 V), expanding towards an expansion chamber (EC) from an ECR plasma source is investigated using Langmuir probes (LPs) and Ion Energy Analysers (IEAs). The LPs reveal presence of a second ionization zone (SIZ) a few centimetres from the ECR zone, indicating very short ionization mean paths, which are confirmed theoretically. The SIZ gives a density boost, produces a double layer, DL (ΔV_{DL} {\approx} 106 - 40 V) and a warm electron population after the DL (n_{w}/n {\approx} 0.04 - 0.10, T_{w} {\approx} 40 - 60 eV). IEA measurements conducted at two sites (z_{1} {\approx} 5 cm, z_{2} {\approx} 10 cm) reveal ions with energies in the range {\approx} 65 - 8 eV at pressures {\approx} 1 - 8 mTorr. DL formation is explained in terms of the SIZ and warm electron generation is analysed in detail.
Related
- Exact Solution of the Direct and Inverse Quasi-stationary Dynamo Problem in the Expanding Plasma Ball
- Influence of pump-probe beam offset and modulation frequency on photothermal deflection spectroscopy signals in liquid sensing: A combined theoretical and experimental study
- Collisionless stationary states of a stratified plasma in an expanding magnetic tube with stochastic heating
- Neutrino Anomalies and Tensions: Experimental Status and Theoretical Interpretations
- Experimental and theoretical investigation on N₂ pressure-induced coefficients of the lowest rotational transitions of HCN
BibTeX
@misc{singh2026experimental,
title = {{Experimental and Theoretical Study of Flow Dynamics of Expanding Hydrogen Plasma from an ECR Plasma Source}},
author = {Priti Singh and Ramesh Narayanan and Ashish Ganguli and Debaprasad Sahu and Subhasish Bag},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.26070},
eprint = {2609.26070},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.26070},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Experimental and Theoretical Study of Flow Dynamics of Expanding Hydrogen Plasma from an ECR Plasma Source
AU - Priti Singh
AU - Ramesh Narayanan
AU - Ashish Ganguli
AU - Debaprasad Sahu
AU - Subhasish Bag
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.26070
UR - https://arxiv.org/abs/2609.26070
AB - The flow of moderately dense (n {\approx} 10^{11} cm^{-3}) hydrogen plasma with high electron temperature (T_{e} {\approx} 30 - 35 eV) and plasma potential (V_{p} {\approx} 100 V), expanding towards an expansion chamber (EC) from an ECR plasma source is investigated using Langmuir probes (LPs) and Ion Energy Analysers (IEAs). The LPs reveal presence of a second ionization zone (SIZ) a few centimetres from the ECR zone, indicating very short ionization mean paths, which are confirmed theoretically. The SIZ gives a density boost, produces a double layer, DL (ΔV_{DL} {\approx} 106 - 40 V) and a warm electron population after the DL (n_{w}/n {\approx} 0.04 - 0.10, T_{w} {\approx} 40 - 60 eV). IEA measurements conducted at two sites (z_{1} {\approx} 5 cm, z_{2} {\approx} 10 cm) reveal ions with energies in the range {\approx} 65 - 8 eV at pressures {\approx} 1 - 8 mTorr. DL formation is explained in terms of the SIZ and warm electron generation is analysed in detail.
ER -