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Laboratory of microwave discharge physics and carbon materials synthesis
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Results
| 1. Polycrystalline diamond disks of 0.2-1.5 mm thickness and 50-75 mm in diameter |
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Freestanding polycrystalline diamond disks
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FWHM of diamond peak - 2.5-3.5 cm-1
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| 2. Gyrotron window with cooling system made from polycrystalline diamond disk |
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Dependence of tangent of losses in diamond disk on microwave frequency
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| 3.Single-crystal CVD diamond film of 0.1-0.5 mm thickness, grown on HPHT substrate 3x3x0.5 mm in size |
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Single-crystal CVD diamond layer of 200 μm thickness grown on HPHT diamond substrate
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Raman spectrum of single-crystal CVD diamond, FWHM of diamond peak - 1.8 cm-1
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References:
A. L. Vikharev, A. M. Gorbachev, A. B. Muchnikov and D. B. Radishchev, Study of microwave plasma-assisted chemical vapor deposition of poly-and single-crystalline diamond films, Radiophysics and Quantum Electronics, 50 (2007) ¹ 10-11, 913
A.B.Muchnikov, A.L.Vikharev, A.M.Gorbachev, D.B.Radishev, V.D.Blank, S.A.Terentiev, "Homoepitaxial single crystal diamond growth at different gas pressures and MPACVD reactor configurations", Diamond and Related Materials, 19 (2010) 432
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| 4. Two channel active microwave pulse compressors on frequency 11.4 GHz |
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Scheme of two channel active microwave compressor with plasma switches:
1 - microwave generator, 2 - matched load, 3 - 3dB coupler, 4 - first compressor channel,
5 - second compressor channel, 6 - TE10 to TE01 mode converter, 7 - plasma switch,
8 - storage resonator, 9 - reflector, 10 - phase shifter
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Oscillogramm of incident and compressed microwave pulses
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References:
A. L. Vikharev , A. M. Gorbachev, O. A. Ivanov, V. A. Isaev, S. V. Kuzikov, B. Z. Movshevich, J. L. Hirshfield, S. H. Gold, Active Bragg Compressor of 3-cm Wavelength Microwave Pulses, Radiophysics and Quantum Electronics, 51 (2008) ¹ 7, 539
A.L. Vikharev, A.M. Gorbachev, O.A. Ivanov, V.A. Isaev, V.A. Koldanov, S.V. Kuzikov, J.L. Hirshfield, S.H. Gold, Two-Channel 100-MW Microwave Compressor for the Three-Centimeter Wavelength Range, Radiophysics and Quantum Electronics, 51 (2008) ¹ 8, 597 |
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Scheme of active microwave pulse compressor with plasma switch utilizing mode conversion: 1 - microwave generator, 2 - circulator, TE10 to TE01 Maurer mode converter,
4 - input and output waveguide, 5 - input horn, 6 - storage resonator, 7 - directional coupler,
8 - detector, 9 - digital oscilloscope, 10 - matched load, 11 - plasma switch,
12 - high voltage pulses generator, 13 - pump-out system
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Oscillogramm of incident and compressed microwave pulses
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References:
Vikharev A.L., Gorbachev A.M., Ivanov O.A., Isaev V.A., Kuzikov S.V., Lobaev M.A., Hirshfield J.L., Gold S.H., Kinkead A.K., High power active pulse compressor using plasma switches, Physical Review ST AB, 12 (2009) 062003
A. L. Vikharev, A. M. Gorbachev, O. A. Ivanov , V. A. Isaev, S. V. Kuzikov, M. A. Lobaev, A plasma switch based on TE02 - TE01 round waveguide mode conversion for high-power X-band microwave compressors, Technical Physics Letters, 33 (2007) ¹ 9, 785
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| 5. Investigation of multipactor discharge initiation and suppression on dielectric surfaces |
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Instantaneous distribution of microwave field in resonator
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Distribution of electrostatic field lines inside microwave resonator for quartz disk 6 mm thick
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Dependence of threshold microwave field of multipactor discharge initiation on amplitude of electrostatic field for quartz
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References:
O.A. Ivanov, M.A. Lobaev, V.A. Isaev, A.L. Vikharev, Experimental Study of a Multipactor Discharge on a Dielectrics Surface in a High-Q Microwave Cavity, Plasma Physics Reports, 36 (2010) ¹ 4, 336
M.A. Lobaev, O.A. Ivanov, V.A. Isaev, A.L. Vikharev, Effect of Inhomogeneous Microwave Field on the Threshold of Multipactor Discharge on a Dielectric, Technical Physics Letters, 35 (2009) ¹ 12, 1074
Ivanov O.A., Lobaev M.A., Isaev V.A., Vikharev À.L., Suppressing and Initiation of Multipactor Discharge on a Dielectric by an External DC Bias, Phys. Rev. ST AB, 13 (2010) 022004 |
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