Phenomena in gases and plasmas with negative ions

The spectroscopic and probe methods are used to measure the microscopic parameters of plasma of pulsed and stationary transverse discharges in a supersonic air jet flowing into a submerged space. The measurements are performed for the Mach number of flow M = 2, submerged space pressure p = 5 to 30 kPa, degree of the jet being off-design n ≈ 2, and discharge current I = 1 to 10 A. The discharge current dependences of the average values of gas temperature, charged particle concentration, and reduced electric field are measured for a discharge mode close to that of current generator. The measured values of gas temperature lie in the range of 1 to 3 kK, those of charged particles concentration -of 10 13 to 10 14 cm -3 , and of reduced electric field -of 40 to 20 Td. The axial distribution of temperature is characterized by high values of temperature even at short distances from the electrodes and by a slow decrease along the flow.

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“…The coefficient of ion-ion recombination at a pressure of ~100 torr is of the order of 10 -6 cm 3 /s [10,18]. The coefficient of ion-ion recombination at a pressure of ~100 torr is of the order of 10 -6 cm 3 /s [10,18].…”

Section: Probe Measurementsmentioning

confidence: 99%

Heat capacity of liquid hafnium from the melting point to the boiling point at atmospheric pressure

Korobenko¹,

Polyakova

²

,

Savvatimskii

³

2005

High Temp

2

0

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The spectroscopic and probe methods are used to measure the microscopic parameters of plasma of pulsed and stationary transverse discharges in a supersonic air jet flowing into a submerged space. The measurements are performed for the Mach number of flow M = 2, submerged space pressure p = 5 to 30 kPa, degree of the jet being off-design n ≈ 2, and discharge current I = 1 to 10 A. The discharge current dependences of the average values of gas temperature, charged particle concentration, and reduced electric field are measured for a discharge mode close to that of current generator. The measured values of gas temperature lie in the range of 1 to 3 kK, those of charged particles concentration -of 10 13 to 10 14 cm -3 , and of reduced electric field -of 40 to 20 Td. The axial distribution of temperature is characterized by high values of temperature even at short distances from the electrodes and by a slow decrease along the flow.

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“…Formula ( 14) has been derived earlier (Aints et al 1995) and in the limit ω → 0 it reduces to that in the steady electric field E = E a / √ 2 (Gatland 1974, Aleksandrov and Napartovich 1986, Iinuma and Takebe 1992.…”

Section: The Pseudo Diffusion Coefficient: Particular Casesmentioning

confidence: 99%

“…It should be noted that similar pseudo diffusion has been considered for a few systems in a steady electric field. These are: electrons (or holes) transiting between energy valleys with different effective electron masses in a solid state plasma (Shockley et al 1966, Ohmi and Hasuo 1969, Matulionis and Starikov 1981; electrons moving through a gas and captured by molecules to form unstable negative ions (Aleksandrov and Napartovich 1986), and stable ions (Aleksandrov and Okhrimovskii 1995); and the transport of ions in a gas with fast forward-backward ion-molecule reactions (Gatland 1974, Iinuma and Takebe 1992, Iinuma et al 1994.…”

Section: Introductionmentioning

confidence: 99%

High-frequency electrical breakdown in electronegative gases with fast electron attachment and detachment processes

Aleksandrov¹,

Napartovich²,

Okhrimovskyy³

1997

J. Phys. D: Appl. Phys.

1

0

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Department of Physical Mechanics, Moscow Institute of Physics and Technology, 141700, Dolgoprudny, Russia Troitsk Institute for Innovation and Fusion Research, 142092 Troitsk, Moscow Region, Russia Received 1 April 1996 Abstract: Breakdown in a high-frequency uniform electric field in electronegative gases with fast electron attachment and detachment processes is theoretically studied. A process of electron pseudo diffusion introduced earlier by Aints et al is analysed, and a breakdown criterion is regularly derived using the great difference in rate scales for collisional processes. The criterion is generalized to account for an arbitrary number of negative ion species including those which are not involved in electron detachment reactions. The importance of the electron pseudo diffusion is illustrated for specified gases (air, , etc). It is argued that the application of the concept of pseudo diffusion to the breakdown in air under the conditions of the experiment conducted previously by Aints et al is invalid.

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Phenomena in gases and plasmas with negative ions

Cited by 15 publications

References 48 publications

Transverse electric discharges in supersonic air flows: microscopic characteristics of discharge

Transverse electric discharges in supersonic air flows: microscopic characteristics of discharge

Heat capacity of liquid hafnium from the melting point to the boiling point at atmospheric pressure

High-frequency electrical breakdown in electronegative gases with fast electron attachment and detachment processes

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