TY - JOUR
T1 - Numerical model for the determination of the reduced electric field in a CO2 microwave plasma derived by the principle of impedance matching
JF - Plasma Sources Science and Technology
Y1 - 2019
A1 - Groen, P. W. C.
A1 - Wolf, A. J.
A1 - Righart, T. W. H.
A1 - van de Sanden, M. C. M.
A1 - Peeters, F. J. J.
A1 - Bongers, W. A.
AB - Three dimensional electromagnetic modelling of a free-standing CO2 microwave plasma has been performed, by describing the plasma as a dielectric medium. The relative permittivity and conductivity of the medium are parametrised. The waveguide geometry from experiment, including the tuner, is put into the model, knowing that this corresponds to maximum power transfer of the microwave generator to the plasma under plasma impedance matching conditions. Two CO2 plasma discharge regimes, differing mainly in pressure, input power and temperature, have been studied. The model's validity has been checked through study of materials of known conductivity. From measurements of the neutral gas temperature and the plasma electron density profile, the reduced electric field is determined. From the parametrisation of the dielectric properties, a range for the effective electron-neutral collision frequency for momentum transfer is estimated. The results for the reduced electric field and the range of the electron neutral collision frequency obtained, are consistent as verified by simulations using BOLSIG+. In addition, from this comparison it is possible to narrow down the range of the collision frequencies, and to estimate the electron temperature. The reduced electric field lies between 80 and 180 Td for the relatively low pressure, low input power, the so-called 'diffuse' regime. For the relatively high pressure, high input power ('contracted') regime it lies between 10 and 60 Td. The normalised collision frequency lies between 1.6 and 2.3 for the diffuse regime, while for the contracted regime it lies between 2 and 3. The electron temperature ranges from 2 to 3 eV for the diffuse regime, and from 0.5 to 1 eV for the contracted regime. Related content: 10.1088/1361-6595/ab1ca1
VL - 28
IS - 7
U1 - MaSF
U2 - PSFD
U5 - 563dcc592c1a5834f7f65e6168d00c5e
ER -
TY - JOUR
T1 - Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
JF - Journal of Visualized Experiments
Y1 - 2017
A1 - van den Bekerom, D. C. M.
A1 - den Harder, N.
A1 - Minea, T.
A1 - Gatti, N.
A1 - Palomares-Linares, J. M.
A1 - Bongers, W. A.
A1 - van de Sanden, M. C. M.
A1 - van Rooij, G. J.
AB - This article describes a flowing microwave reactor that is used to drive efficient non-equilibrium chemistry for the application of conversion/activation of stable molecules such as CO2, N2 and CH4. The goal of the procedure described here is to measure the in situ gas temperature and gas conversion.
VL - 2017
UR - https://www.jove.com/video/55066/non-equilibrium-microwave-plasma-for-efficient-high-temperature
IS - 126
U1 - MaSF
U2 - NFC
U3 - FP00
U5 - 99c4e26e071750e0fe65ee1010f747ef
ER -
TY - JOUR
T1 - New millimeter-wave access for JET reflectometry and ECE
JF - Fusion Engineering and Design
Y1 - 2005
A1 - Cupido, L.
A1 - de la Luna, E.
A1 - Antonucci, C.
A1 - Guigon, A.
A1 - van Amerongen, F.
A1 - Bongers, W. A.
A1 - Donne, A. J. H.
A1 - M. F. Graswinckel
A1 - Bruschi, A.
A1 - Cirant, S.
A1 - Simonetto, A.
A1 - Sozzi, C.
A1 - Wagner, D.
A1 - Manso, E.
A1 - Meneses, L.
A1 - Silva, F.
A1 - Varela, P.
A1 - Balshaw, N.
A1 - Chareau, J. M.
A1 - Conway, G.
A1 - Fessey, J.
A1 - Hanks, S.
A1 - Pearce, R.
A1 - Ricardo, V.
A1 - Sands, D.
A1 - Starky, D.
A1 - Tisconia, T.
VL - 74
SN - 0920-3796
UR - ://000233886800107
U1 - Fusion Physics
U2 - Instrumentation development
U5 - 26875bf1d4e498559d0e563fedb8d124
ER -