DEVELOPMENT OF FIELD EMITTERS FOR SHORT WAVE MICROWAVE DEVICES AND THEIR INVESTIGATION IN SPbPU. THE LAST ACHIEVEMENTS
Cite this article as:
Sominski G. G., Sezonov V. Е., Tumareva T. A., Taradaev Е. P. DEVELOPMENT OF FIELD EMITTERS FOR SHORT WAVE MICROWAVE DEVICES AND THEIR INVESTIGATION IN SPbPU. THE LAST ACHIEVEMENTS. Izvestiya VUZ. Applied Nonlinear Dynamics, 2018, vol. 26, iss. 3, pp. 109-126. DOI: https://doi.org/10.18500/0869-6632-2018-26-3-109-126
Topic and aim. The data on the latest achievements of authors on the development and investigation of field emitters for electron-beam microwave devices of millimeter and submillimeter wavelengths range are presented. Methods. The methods for creating and characteristics of new type cathodes, that are of great practical interest, are described: multi-tip silicon cathodes with two-layer metal-fullerene coatings and multilayer nano-structured cathodes, whose emission is determined by the fields at the contacts of materials with a different work function. Numerical calculations and experimental investigation were carried out to optimize the cathodes and to determine their emission characteristics. The most important features of the experimental setup used are as follows. • The operative change of the pressure from the minimal value 10−9 –10−10 Torr up to 10−6 Torr and back is possible. • It is possible to carry out a number of technological operations directly in the vacuum chamber, including the deposition and treatment of coatings. • It is possible to study the emission characteristics of cathodes in the continuous and pulsed modes over a wide range of voltages (up to 15–25 kV) and currents (up to 0.5 A). Results. A large number of new results have been obtained which particularly include: • fairly simple and reproducible technologies for creating multi-tip and multilayer emitters have been worked out; • the mechanism of functioning of protective fullerene coatings has been defined; • the optimal structure and morphology of the surface of multi-tip cathodes with metal-fullerene coatings have been determined and the possibility of obtaining the field emission currents up to about 100 mA with the current density up to 0.4 A/cm2
has been demonstrated; • the optimal structure of multilayer hafnium-platinum cathodes was determined and the possibility of obtaining the emission currents of about 2 mA at an extremely high current density of about 200 A/cm2 has been demonstrated; • the possibility of a long-term stable operation of the created cathodes at large currents in the conditions of at technical vacuum has been demonstrated. Discussion. Summarizing, it can be said that the created and studied cathodes are promising for use in miniature high-voltage electron-beam microwave devices of the millimeter and submillimeter wavelength range.
DOI: 10.18500/0869-6632-2018-26-3-109-126
References: Sominskii G.G., Sezonov V.E., Tumareva T.A.,Taradaev E.P. Development of field emitters for short wave microwave devices and their investigation in SPBPU . The last achievements. Izvestiya VUZ, Applied Nonlinear Dynamics, 2018, vol. 26, iss. 3, pp. 109-126. DOI: 10.18500/0869-6632-202018-26-3-109-126
1. Glyavin M.Yu., Manuilov V.N., Sominskii G.G., Taradaev E.P., Tumareva T.A. The concept of an electron-optical system with field emitter for a spectroscopic gyrotron // Infrared Physics & Technology. 2016. Vol. 78. Pp. 185–189.
2. Burtsev A.A., Grigor’ev Yu.A., Danilushkin A.V., Navrotskii I.A., Pavlov A.A., Shumikhin K.V. Features of the development of electron-optical systems for pulsed terahertz traveling wave lamps: Review. Tech. Phys., 2018, vol. 63, iss. 3, pp. 452–459.
3. Whaley D.R., Duggal R., Armstrong C.M., Bellew C.L., Holland C.E., Spindt C.A. 100 W operation of a cold cathode TWT // IEEE Transactions on Electron Devices. 2009. Vol. 56, no. 5. Pp. 896–905.
4. Spindt C., Holland C.E., Schwoebel P.R. A reliable improved Spindt cathode design for high currents // Vacuum Electronics Conference 2010 (IVEC–2010). IEEE International. 2010. May. Pp. 201–202.
5. Chen Z., Zhang Q., Lan P., Zhu B., Yu T., Cao G., den Engelsen D. Ultrahigh-current field emission from sandwich-grown well-aligned uniform multi-walled carbon nanotube arrays with high adherence strength // Nanotechnology. 2007. Vol. 18. Pp. 265702.
6. Bushuev N. A., Glukhova O. E., Grigor’ev Yu. A., Ivanov D. V., Kolesnikova A.S., Nikolaev A.A., Shalaev P.D., Shesterkin V.I. Emissivity of a multibeam electron gun with a glassy carbon field-emission cathode. Tech. Phys., 2016, vol. 61, iss. 2, pp. 290–295.
7. Aban’shin N. P., Gorfinkel’ B. I., Morev S. P., Mosiyash D.S., Yakunin A.N. Autoemission structures of nanosized carbon with ionic protection. Studying the prospects of reliable control in forming structures. Tech. Phys. Letters, 2014, vol. 40, iss. 5, pp. 404–407.
8. Tumareva T. A., Sominskii G. G., Efremov A. A., Polyakov A. S. Tip field emitters coated with fullerenes. Tech. Phys., 2002, vol. 47, iss. 2, pp. 244–249.
9. Tumareva T. A., Sominskii G. G., Bondarenko A.K., Veselov A.A., Svetlov I.A. Activation of fullerene coatings on field emitters by potassium atom and ion fluxes. Tech. Phys., 2006, vol. 51, iss. 7, pp. 898–901.
10. Tumareva T.A., Sominskii G. G., Svetlov I. A., Morozov A. N. Fullerene-coated field emitters activated by a potassium ion flux in high electric fields. Tech. Phys., 2008, vol. 53, iss. 11, pp. 1504–1507.
11. Campbell E.E.B., Tellgmann R., Krawez N., Hertel I.V. Production and LDMS characterisation of endohedral alkalifullerene films. Journal of Physics and Chemistry of Solids, 1997, vol. 58, iss. 11, pp. 1763–1769.
12. Givargizov E.I. Crystal whiskers and nano-tips. Nature, 2003, iss. 11, pp. 20–25 (in Russian).
13. Karabutov A.V., Konov V.I., Pimenov S.M., Frolov V.D., Obraztsova E.D., Polyakov V.I., Rossukanyi N.M. Peculiarities of field electron emission from CVD diamond films. J. De Physique IV, 1996, vol. 6, iss. 5, pp. C5113–C5118.
14. Sominskii G.G., Tumareva T.A., Taradaev E.P., Mishin M.V., Stepanova A.N. Multitip semiconductor field emitters with new-type bilayer protecting coatings. Tech. Phys., 2015, vol. 60, iss. 1, pp. 133–141.
15. Sominskii G.G., Sezonov V.E., Taradaev E.P., Tumareva T.A., Zadiranov Y.M., Kornishin S.Y., Stepanova A.N. Innovative field emitters for high-voltage electronic devices. Radiophysics and Quantum Electronics, 2015, vol. 58, iss. 7, pp. 511–519.
16. Sominskii G.G., Taradaev E.P., Tumareva T.A., Mishin M.V., Stepanova A.N. Field emission of multitip silicon structures with protection coatings. Tech. Phys., 2016, vol. 61, iss. 11, pp. 1711–1714.
17. COMSOL Multiphysics. Platform for modeling physical processes [Electronic resource]. https://www.comsol.ru/comsol-multiphysics.
18. Dobretsov L.N., Gomoyunova M.V. Emission Electronics. Moskow: Nauka, 1966, 564 p. (in Russian).
19. Fomenko V.S. Emission Properties of Materials: A Hand book. Kiev: Naukova Dumka, 1981, 339 p. (in Russian).
20. Sominskii G.G., Sezonov V.E., Tumareva T.A., Taradaev E.P. Field Emitter. Patent of the Russian Federation N0 118119 for utility model. Published on 10.07.2012.
BibTeX
author = {G. G. Sominski and V Е. Sezonov and T. A. Tumareva and Е. P. Taradaev },
title = {DEVELOPMENT OF FIELD EMITTERS FOR SHORT WAVE MICROWAVE DEVICES AND THEIR INVESTIGATION IN SPbPU. THE LAST ACHIEVEMENTS},
year = {2018},
journal = {Izvestiya VUZ. Applied Nonlinear Dynamics},
volume = {26},number = {3},
url = {https://old-andjournal.sgu.ru/en/articles/development-of-field-emitters-for-short-wave-microwave-devices-and-their-investigation-in},
address = {Саратов},
language = {russian},
doi = {10.18500/0869-6632-2018-26-3-109-126},pages = {109--126},issn = {0869-6632},
keywords = {field emission,multitip cathodes,multilayer cathodes,technical vacuum,ion bombardment,two-layered metal-fullerene coatings,fields of contact potential difference,short-wave electron-beam microwave devices},
abstract = {Topic and aim. The data on the latest achievements of authors on the development and investigation of field emitters for electron-beam microwave devices of millimeter and submillimeter wavelengths range are presented. Methods. The methods for creating and characteristics of new type cathodes, that are of great practical interest, are described: multi-tip silicon cathodes with two-layer metal-fullerene coatings and multilayer nano-structured cathodes, whose emission is determined by the fields at the contacts of materials with a different work function. Numerical calculations and experimental investigation were carried out to optimize the cathodes and to determine their emission characteristics. The most important features of the experimental setup used are as follows. • The operative change of the pressure from the minimal value 10−9 –10−10 Torr up to 10−6 Torr and back is possible. • It is possible to carry out a number of technological operations directly in the vacuum chamber, including the deposition and treatment of coatings. • It is possible to study the emission characteristics of cathodes in the continuous and pulsed modes over a wide range of voltages (up to 15–25 kV) and currents (up to 0.5 A). Results. A large number of new results have been obtained which particularly include: • fairly simple and reproducible technologies for creating multi-tip and multilayer emitters have been worked out; • the mechanism of functioning of protective fullerene coatings has been defined; • the optimal structure and morphology of the surface of multi-tip cathodes with metal-fullerene coatings have been determined and the possibility of obtaining the field emission currents up to about 100 mA with the current density up to 0.4 A/cm2 has been demonstrated; • the optimal structure of multilayer hafnium-platinum cathodes was determined and the possibility of obtaining the emission currents of about 2 mA at an extremely high current density of about 200 A/cm2 has been demonstrated; • the possibility of a long-term stable operation of the created cathodes at large currents in the conditions of at technical vacuum has been demonstrated. Discussion. Summarizing, it can be said that the created and studied cathodes are promising for use in miniature high-voltage electron-beam microwave devices of the millimeter and submillimeter wavelength range. DOI: 10.18500/0869-6632-2018-26-3-109-126 References: Sominskii G.G., Sezonov V.E., Tumareva T.A.,Taradaev E.P. Development of field emitters for short wave microwave devices and their investigation in SPBPU . The last achievements. Izvestiya VUZ, Applied Nonlinear Dynamics, 2018, vol. 26, iss. 3, pp. 109-126. DOI: 10.18500/0869-6632-202018-26-3-109-126 }}