A hot-filament discharge with very low electron temperature

Handley, Ward; Robertson, Scott

doi:10.1063/1.3075935

Cited by 9 publications

(10 citation statements)

References 30 publications

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“…A typical thermionically heated emissive probe emits electrons with a temperature of $0.2 eV, while the plasma electron temperature can be as low as 1 eV or less in some low-temperature laboratory experiments. 27 For these parameters, H ¼ 5 and / w ¼ À0:51T ep =e. Including the effects of the plasma electrons lost to the wall and non-zero emitted electron temperature yields a sheath potential half that predicted by the widely used fluid theory.…”

Section: A Single Component Maxwellian Bulk Plasmamentioning

confidence: 99%

Effects of emitted electron temperature on the plasma sheath

et al. 2014

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It has long been known that electron emission from a surface significantly affects the sheath surrounding that surface. Typical fluid theory of a planar sheath with emitted electrons assumes that the plasma electrons follow the Boltzmann relation and the emitted electrons are emitted with zero energy and predicts a potential drop of 1.03Te/e across the sheath in the floating condition. By considering the modified velocity distribution function caused by plasma electrons lost to the wall and the half-Maxwellian distribution of the emitted electrons, it is shown that ratio of plasma electron temperature to emitted electron temperature significantly affects the sheath potential when the plasma electron temperature is within an order of magnitude of the emitted electron temperature. When the plasma electron temperature equals the emitted electron temperature the emissive sheath potential goes to zero. One dimensional particle-in-cell simulations corroborate the predictions made by this theory. The effects of the addition of a monoenergetic electron beam to the Maxwellian plasma electrons were explored, showing that the emissive sheath potential is close to the beam energy only when the emitted electron flux is less than the beam flux.

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Section: A Single Component Maxwellian Bulk Plasmamentioning

confidence: 99%

Effects of emitted electron temperature on the plasma sheath

et al. 2014

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“…The electric current makes magnetic field around the cathode wire and the magnetic field cause inhomogeneous emission of electrons from the cathode. Very low electron temperatures have been obtained by Handly and Robertson (2009), in a hot-filament discharge device by having a set of conditions designed to minimize heating of the confined electrons. Zhe, Zhigang, Yikang, and Xiaozhang (2010) generated a sheet plasma is by a mesh anode and a single hot-filament cathode with a DC power supply, and its characteristics are experimentally investigated.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hot Cathode and Hollow Anode of Argon Glow Discharge Plasma

Al-Hakary¹,

Dosky²,

Talal³

2014

APR

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Hot cathode and hollow anode argon DC glow discharge plasma at different pressures of (0.04, 0.05, 0.06, 0.07, 0.09, 0.2, 0.4, and 0.8 mbar) has been investigated. The experiments were carried out under the influence of pressure and filament cathode current on voltage-current characteristics of glow discharge and its breakdown voltage. Plasma parameters have been measured and obtained using single probe method at fixed discharge current (I d =1.88 mA) and hollow anode diameter. A computer MATLAB program is performed for this purpose. It was shown that the discharge voltage-current characteristics curve has a positive resistance and represents an abnormal glow region at pressure (0.04 and 0.06) mbar for different filament current. The breakdown voltage increases as the filament current is increased. In different pressure, electron temperature shows different behavior with increasing filament current. Electron density varies nearly inversely with the filament current, but it is increase due to increase of pressure from (1 to 3 mbar), then tends to decrease for the higher pressure. There are two groups of electrons according to the two peaks of (EEDFs), and the peaks amplitude decrease, with the increases of both filament current and gas pressure.

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“…The electric current makes magnetic field around the cathode wire and the magnetic field cause inhomogeneous emission of electrons from the cathode. Very low electron temperatures have been obtained by [3]. A thermionic emission electron has been got by heating a wire filament, accelerating the electrons by high voltage, and ionizing the analyzed molecules [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pressure and Hot Filament Cathode on Some Plasma Parameters of Hollow Anode Argon Glow Discharge Plasma

Al-Hakary¹

2016

AJMP

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The present study represents a review article and a complementary study to a published paper of direct current hot cathode and hollow anode argon glow discharge plasma at different pressures in the range 0.05-0.8 mbar. The glow discharge usually obtained by applying a high voltage between the electrodes sufficient to occurring breakdown of argon gas and sustaining the discharge. Additional estimation of some plasma parameters, ion temperature, degree of ionization and electron energy distribution function as well as some characteristics of glow discharge under the influence of pressure and filament current has been done. Plasma parameters have been calculated using single probe method at fixed discharge current I d =1.88mA and diameter of hollow anode. Furthermore a computer MATLAB program is applied for this purpose. Results show that the average discharge voltage increases while its average discharge current decreases according to the increasing of the filament current. On the Contrary the average discharge voltage decrease nearly exponentially whiles its average discharge current increases according to increasing of the gas pressure. Degree of ionization starts to increase from low pressure to medium and then tends to decrease toward high pressure investigated. However it starts to increase to maximum value at filament current 0.9A then tends to decrease at higher current and low pressure. While for high pressures there is no significance change. Ion temperature increases slowly with filament current up to 0.9A and then sharply increases to maximum value at 1.5A. But it decreases for pressures in the range 0.05-0.09 mbar and then increases with gas pressure. Electron energy distribution function (EEDFs) decrease according to increases filament current, however, it starts to increase from low pressure to maximum value at medium pressure then tends to increase according to further increases of pressure.

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A hot-filament discharge with very low electron temperature

Cited by 9 publications

References 30 publications

Effects of emitted electron temperature on the plasma sheath

Effects of emitted electron temperature on the plasma sheath

Investigation of Hot Cathode and Hollow Anode of Argon Glow Discharge Plasma

Effect of Pressure and Hot Filament Cathode on Some Plasma Parameters of Hollow Anode Argon Glow Discharge Plasma

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