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Klimov AS, Bakeev IY, Burachevsky YA, Dagri JE, Oks EM, Zenin AA. Forevacuum plasma-cathode electron source for generation of a ribbon beam over a wide pressure range. Rev Sci Instrum 2023; 94:073505. [PMID: 37493502 DOI: 10.1063/5.0159804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 07/12/2023] [Indexed: 07/27/2023]
Abstract
We describe the results of our investigations of the generation of a ribbon electron beam (10 × 220 mm2) by a two-stage discharge system based on a hollow-cathode glow discharge plasma. The source design enables operation in the pressure range 2 × 10-2 to 10 Pa. At a beam accelerating voltage of 8 kV, the beam current is 450 mA at a pressure of 2 × 10-2 Pa and 150 mA at a pressure of 10 Pa. To achieve a uniform current density distribution of the beam over its cross-sectional area, a special design of emission electrode was employed. This enabled us to reduce non-uniformities of the beam current density distribution to a level of 10%.
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Affiliation(s)
- A S Klimov
- Laboratory of Plasma Electronics, Tomsk State University of Control Systems and Radioelectronics, 634050 Tomsk, Russia
| | - I Yu Bakeev
- Laboratory of Plasma Electronics, Tomsk State University of Control Systems and Radioelectronics, 634050 Tomsk, Russia
| | - Yu A Burachevsky
- Laboratory of Plasma Electronics, Tomsk State University of Control Systems and Radioelectronics, 634050 Tomsk, Russia
| | - J E Dagri
- Laboratory of Plasma Electronics, Tomsk State University of Control Systems and Radioelectronics, 634050 Tomsk, Russia
| | - E M Oks
- Laboratory of Plasma Electronics, Tomsk State University of Control Systems and Radioelectronics, 634050 Tomsk, Russia
- Laboratory of Plasma Sources, Institute of High Current Electronics SB RAS, 634034 Tomsk, Russia
| | - A A Zenin
- Laboratory of Plasma Electronics, Tomsk State University of Control Systems and Radioelectronics, 634050 Tomsk, Russia
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Klimov AS, Bakeev IY, Oks EM, Tran VT, Zenin AA. Plasma electron source for generating a ribbon beam in the forevacuum pressure range. Rev Sci Instrum 2020; 91:043505. [PMID: 32357761 DOI: 10.1063/1.5130954] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 03/20/2020] [Indexed: 06/11/2023]
Abstract
We describe a plasma-cathode electron beam source based on a hollow cathode glow discharge and operating in the forevacuum pressure range that produces a steady-state ribbon beam. The electron beam is generated in the pressure range of 10-30 Pa. A multi-aperture electron extraction and beam formation system is used to provide beam stability and enhanced uniformity of beam current density, allowing the use of this kind of device for beam-plasma surface modification over relatively large areas.
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Affiliation(s)
- A S Klimov
- Physics Department, Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
| | - I Yu Bakeev
- Physics Department, Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
| | - E M Oks
- Physics Department, Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
| | - V T Tran
- Physics Department, Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
| | - A A Zenin
- Physics Department, Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
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Zenin AA, Bakeev IY, Klimov AS, Oks EM, Tran VT. Forevacuum-pressure plasma-cathode high-power continuous electron beam source. Rev Sci Instrum 2020; 91:033303. [PMID: 32259940 DOI: 10.1063/1.5142316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Accepted: 02/12/2020] [Indexed: 06/11/2023]
Abstract
We describe a plasma-cathode electron beam source based on a hollow-cathode discharge that is capable of generating a 9 kW dc electron beam at an accelerating voltage of 20 kV, with helium as a working gas at a pressure of 30 Pa. A test run of ∼50 operational hours did not indicate any significant degradation of the electron source extraction system or other structural components, and we estimate the operational lifetime of the source at about 100-120 h.
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Affiliation(s)
- A A Zenin
- Physics Department, Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
| | - I Yu Bakeev
- Physics Department, Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
| | - A S Klimov
- Physics Department, Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
| | - E M Oks
- Physics Department, Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
| | - Van Tu Tran
- Physics Department, Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
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Filkin SY, Chertova NV, Zenin AA, Lipkin AV, Sichev AA, Bityak DS, Sadykhov EG, Popov VO, Fedorov AN. Expression, purification and biophysical characterization of recombinant Streptomyces violaceoruber phospholipase PLA2 overproduced in Pichia pastoris. Prep Biochem Biotechnol 2020; 50:549-555. [PMID: 31933410 DOI: 10.1080/10826068.2020.1712657] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Aim: The main purpose of this work was to develop new protocols for high yield purification of secretory phospholipase A2 (PLA2) and to investigate its biophysical properties.Materials and methods: We have used a Pichia pastoris expression system for PLA2 expression and two-stage chromatography for its purification. The biophysical properties of PLA2 were investigated by circular dichroism.Results: A scalable method for high yield purification of recombinant Streptomyces violaceruber PLA2 was developed. The PLA2 from S. violaceruber was expressed in the methylotrophic yeast P. pastoris. Functional active phospholipase A2 with specific activity 73 U/mg was purified with a concentration of at least 3 mg/mL. The role of different divalent ions in PLA2 thermostability were evaluated. Ca2+ and Ba2+ ions significantly increased thermostability of the enzyme.
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Affiliation(s)
- S Y Filkin
- A.N. Bach Institute of Biochemistry, Federal State Institution «Federal Research Centre «Fundamentals of Biotechnology» of the Russian Academy of Sciences», Moscow, Russia
| | - N V Chertova
- A.N. Bach Institute of Biochemistry, Federal State Institution «Federal Research Centre «Fundamentals of Biotechnology» of the Russian Academy of Sciences», Moscow, Russia
| | - A A Zenin
- A.N. Bach Institute of Biochemistry, Federal State Institution «Federal Research Centre «Fundamentals of Biotechnology» of the Russian Academy of Sciences», Moscow, Russia
| | - A V Lipkin
- A.N. Bach Institute of Biochemistry, Federal State Institution «Federal Research Centre «Fundamentals of Biotechnology» of the Russian Academy of Sciences», Moscow, Russia
| | - A A Sichev
- Innovation Center «Birutch», Malobikovo, Russia
| | - D S Bityak
- Innovation Center «Birutch», Malobikovo, Russia
| | - E G Sadykhov
- A.N. Bach Institute of Biochemistry, Federal State Institution «Federal Research Centre «Fundamentals of Biotechnology» of the Russian Academy of Sciences», Moscow, Russia
| | - V O Popov
- A.N. Bach Institute of Biochemistry, Federal State Institution «Federal Research Centre «Fundamentals of Biotechnology» of the Russian Academy of Sciences», Moscow, Russia
| | - A N Fedorov
- A.N. Bach Institute of Biochemistry, Federal State Institution «Federal Research Centre «Fundamentals of Biotechnology» of the Russian Academy of Sciences», Moscow, Russia
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Filkin SY, Chertova NV, Zenin AA, Lipkin AV, Sadykhov EG, Fedorov AN. Development of a Scalable Method for the Isolation and Purification of Recombinant Secretory Phospholipase A2 Expressed in Methylotrophic Yeast Pichia pastoris. APPL BIOCHEM MICRO+ 2019. [DOI: 10.1134/s0003683819060085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Bakeev IY, Klimov AS, Oks EM, Zenin AA. Double-coil magnetic focusing of the electron beam generated by a plasma-cathode electron source. Rev Sci Instrum 2019; 90:023302. [PMID: 30831679 DOI: 10.1063/1.5078655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Accepted: 01/18/2019] [Indexed: 06/09/2023]
Abstract
We present the results of our investigations of magnetic focusing of the electron beam generated by a plasma-cathode electron source in the forevacuum pressure range (10-30 Pa). We show that a magnetic double-focusing system employing two separate field coils with the main magnetic coil located close to the beam collector at the focal plane provides effective and efficient focusing of the electron beam. With our e-beam source, this focusing system produces a power density of more than 1 MW/cm2 at the electron beam focus with an accelerating voltage of 30 kV and a beam current up to 60 mA. For comparison, the maximum beam power density provided by plasma-cathode electron sources at pressures of less than 0.1 Pa is at the level of 10 MW/cm2.
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Affiliation(s)
- I Yu Bakeev
- Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
| | - A S Klimov
- Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
| | - E M Oks
- Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
| | - A A Zenin
- Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia
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Zenin AA, Kuznetsov GP, Kolesnikov VI. Combustion of aluminum-magnesium alloy particles under microgravity conditions. Russ J Phys Chem B 2011. [DOI: 10.1134/s1990793111020138] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Zenin AA, Finyakov SV. Modified double-base propellants: Combustion wave parameters and burning rate response functions. Russ J Phys Chem B 2009. [DOI: 10.1134/s1990793109030191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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