Electric field in APTD in nitrogen determined by EFISH, FNS/SPS ratio, α-fitting and electrical equivalent circuit model

0573460 - ÚFP 2024 RIV GB eng J - Článek v odborném periodiku
Mrkvičková, M. - Kuthanová, L. - Bílek, Petr - Obrusník, A. - Navrátil, Z. - Dvořák, P. - Adamovich, I. - Šimek, Milan - Hoder, T.
Electric field in APTD in nitrogen determined by EFISH, FNS/SPS ratio, α-fitting and electrical equivalent circuit model.
Plasma Sources Science & Technology. Roč. 32, č. 6 (2023), č. článku 065009. ISSN 0963-0252. E-ISSN 1361-6595
Grant CEP: GA ČR(CZ) GA15-04023S
Grant ostatní: AV ČR(CZ) StrategieAV21/3
Program: StrategieAV
Institucionální podpora: RVO:61389021
Klíčová slova: aptd * barrier discharge * efish * electric field * intensity ratio * nitrogen
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 3.8, rok: 2022
Způsob publikování: Omezený přístup
https://iopscience.iop.org/article/10.1088/1361-6595/acd6de

We investigate the electric field development in weak microseconds-lasting atmospheric pressure Townsend discharge operated in a barrier discharge arrangement in pure nitrogen. The electric field is determined using four different methods: laser-aided electric field induced second harmonics (EFISH), optical emission-based first negative/second positive systems (FNS/SPSs of molecular nitrogen) intensity ratio, electrical equivalent circuit approach and via determination of the Townsend first coefficient α(E/N) from the spatial optical emission profile. The resulting values of the electric field obtained by these respective methods, regardless of the differences in absolute values, lie within a reasonable range. The limitations and advantages of all methods are discussed in detail for the investigated discharge. The EFISH measurements are supported by re-computation of the effective interaction-path of the laser using an electrostatic model. The FNS/SPS method provides systematically higher values compared to other methods. We discuss in detail the potential origin of this discrepancy, as this method is at the limit of its applicability due to the low E/N values and we also consider the impossibility of full verification of the underlying assumptions. The focused discussion addresses best-practice issues and identifies possible future steps to improve each of the four methods under given conditions.
Trvalý link: https://hdl.handle.net/11104/0343896