Reflection and transmission of an electromagnetic wave by a gaseous plasma

Nicoll, G. R.; Basu, J. K.

doi:10.1049/pi-c.1962.0049

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…For other density profiles, N e (max) > average N e . Reflection, transmission, and absorption of microwave power for different plasma density profiles have been considered [17]. Therefore, if the condition l >> δ (N e ≥ N c ) is not satisfied, the electromagnetic wave is partially reflected and transmitted through the plasma, and the microwave power is absorbed in the plasma column.…”

Section: Fig 3 Dependence Of Density On the Time Of T 1 Start (A) And...mentioning

confidence: 99%

Non-Resonant Microwave Discharge Start-Up in Heliotron J

Kovtun¹,

Nagasaki²,

Kobayashi³

et al. 2023

Problems of Atomic Science and Technology

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The non-resonant microwave discharge in strong magnetic fields was investigated in Heliotron J under the condition, ωce/ωMW > 1 (ωce and ωMW are the angular electron cyclotron frequency and the angular microwave frequency, respectively). Following the production of a non-resonant microwave discharge plasma, it undergoes several phases in sequence: breakdown and formation of pre-ionized plasma, increase in linear and nonlinear phases of plasma density, and quasi-stationary stage. Several modes of non-resonant microwave discharge were investigated. In the power-scanning mode in non-resonant microwave discharge, a higher plasma density than that in the constant-power mode is achieved. The maximum average density achieved in the experiments is substantially greater than the critical density for O-wave (ordinary waves) 7.45 ⸱1016 m -3 and can reach the value of 2.5⸱10 18 m -3. .

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Section: Fig 3 Dependence Of Density On the Time Of T 1 Start (A) And...mentioning

confidence: 99%

Non-Resonant Microwave Discharge Start-Up in Heliotron J

Kovtun¹,

Nagasaki²,

Kobayashi³

et al. 2023

Problems of Atomic Science and Technology

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show abstract

“…The assumption of a step profile of electron density is not justified in these experiments, as the electron density is a maximum at the front and decays to an equilibrium value. Nicoll and Basu (1962) have tabulated values of Rc for various plasmas of rectangular, triangular and half-cosine shaped electron density profiles. The assumption that the plasma is semi-infinite is not justified and the skin depth (the distance travelled by the microwaves in the plasma when the power has dropped to I/e of its incident value) is computed from microwave free-propagation absorption results.…”

Section: Conductivity Measiirement~ By Microwave Reflectionmentioning

confidence: 99%

Ionization measurement in reactive shock and detonation waves using microwave techniques

Edwards¹,

Hooper²,

Collyer³

1971

J. Phys. D: Appl. Phys.

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The use of microwave cavity techniques in the study of ionization in detonation waves and shock waves in reactive gas mixtures is discussed. Absorption measurements were conducted using a cavity oscillating in the TM010 mode at S band frequency and the shift in resonant frequency of a TE011 mode cavity, operating at X band frequency, was obtained by repetitively sweeping the frequency through the cavity resonance and displaying the response by means of a raster scan generator. The results are compared with microwave free-propagation experiments obtained at X and Q band frequencies in which both the microwave power absorbed by the ionized medium and the power transmitted through and reflected from the medium are monitored. Some results obtained by dc probes are also included for comparison.Equilibrium conductivities measured for the oxyhydrogen and oxyacetylene detonation waves are in reasonable accord with theoretical values. For the reactive shocks, however, the results obtained from the microwave reflection techniques yield far higher values of electron density than those obtained by the absorption methods; this is attributed to the inhomogeneous nature of the ionized medium.

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Reflection and transmission of an electromagnetic wave by a gaseous plasma

Cited by 2 publications

References 5 publications

Non-Resonant Microwave Discharge Start-Up in Heliotron J

Non-Resonant Microwave Discharge Start-Up in Heliotron J

Ionization measurement in reactive shock and detonation waves using microwave techniques

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