Studies of plasma production in a linear device with plane LaB6 cathode and hollow anode

Akhmetov, T. D.; Давыденко, В. И.; Ivanov, A. A.; Shulzhenko, G. I.; Kreter, A.; Unterberg, B.

doi:10.1063/1.4964227

Cited by 3 publications

(4 citation statements)

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“…Its ability to emit electrons has been widely exploited in last 60 years since the pioneering work of Lafferty on sintered hexaboride ceramics 6 . It has been used to build hot cathodes for a large variety of applications, including electron guns in cathode tubes 7 , cathodes for plasma production 8 , 9 and electron microscopes 10 , 11 . While at present, mainly single crystalline emitters are used, sintered ceramics show thermionic properties as well, and historically they have been the first to be studied 6 , 7 , 12 .…”

Section: Introductionmentioning

confidence: 99%

Lanthanum hexaboride for solar energy applications

Sani

Mercatelli

Meucci

et al. 2017

Sci Rep

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We investigate the optical properties of LaB6 – based materials, as possible candidates for solid absorbers in Concentrating Solar Power (CSP) systems. Bulk LaB6 materials were thermally consolidated by hot pressing starting from commercial powders. To assess the solar absorbance and spectral selectivity properties, room-temperature hemispherical reflectance spectra were measured from the ultraviolet to the mid-infrared, considering different compositions, porosities and surface roughnesses. Thermal emittance at around 1100 K has been measured. Experimental results showed that LaB6 can have a solar absorbance comparable to that of the most advanced solar absorber material in actual plants such as Silicon Carbide, with a higher spectral selectivity. Moreover, LaB6 has also the appealing characteristics to be a thermionic material, so that it could act at the same time both as direct high-temperature solar absorber and as electron source, significantly reducing system complexity in future concentrating solar thermionic systems and bringing a real innovation in this field.

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Section: Introductionmentioning

confidence: 99%

Lanthanum hexaboride for solar energy applications

Sani

Mercatelli

Meucci

et al. 2017

Sci Rep

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“…This work continues our studies on plasma production using discharges with flat hot LaB 6 cathodes [3,4]. Previously a plasma source with a segmented cathode and a hollow anode was studied, where the discharge regime was tuned using a separate control magnetic coil [3].…”

Section: Introductionmentioning

confidence: 59%

“…Previously a plasma source with a segmented cathode and a hollow anode was studied, where the discharge regime was tuned using a separate control magnetic coil [3]. Another source design had a single-piece disk cathode and a 20 cm long anode with the bore profile reproducing the shape of the anode of the PSI-2 device [4], with the minimum diameter of 30 mm. However, in the latter discharge geometry the maximum gap across the magnetic field between the cathode edge and the inner surface of the anode was 5 mm, which most likely was insufficient for reliable operation author's e-mail: t.d.akhmetov@inp.nsk.su * ) This article is based on the presentation at the 12th International Conference on Open Magnetic Systems for Plasma Confinement (OS2018).…”

Section: Introductionmentioning

confidence: 99%

“…The second distinct operation mode called cross-field discharge, is characterized by a finite cathode-to-anode gap across the magnetic field. In the majority of the experiments this gap was made equal to 1 cm which provided greater degree of magnetic insulation than in the previous experiments [4]. Two operation modes are characterized by different discharge voltages and plasma density radial distributions.…”

Section: Introductionmentioning

confidence: 99%

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Operation Modes of Hot-Cathode Plasma Source for Linear Devices

Akhmetov

Давыденко

Ivanov

et al. 2019

Plasma and Fusion Research

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Operation of a plasma source with a hot disk cathode and a cylindrical hollow anode in axial magnetic field is sensitive to the cathode-to-anode diameter ratio. When the cathode edge maps along magnetic field lines to the inner anode surface, the discharge voltage is relatively low, and the plasma stream with moderate density occupies the entire cross-section of the anode bore. By contrast, when the cathode projection is fully inside the anode bore with the radial cathode-to-anode gap ∼ 1 cm, the discharge voltage jumps to much higher values exceeding 250 V. The plasma density profile becomes Gaussian-like with the width matching the cathode radius according to magnetic flux surfaces. The plasma density in the high-voltage cross-field discharge reaches 10 13 cm −3 , and the discharge parameters almost do not change with magnetic field up to 1.5 kG in the anode area. This plasma source is suitable for the use in linear devices for plasma-material interaction studies.

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