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10 - Electron Collectors and Cooling

Published online by Cambridge University Press:  27 April 2018

Richard G. Carter
Richard G. Carter
Affiliation:
Lancaster University
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Summary

A linear electron beam is formed by an electron gun which is a diode in which the electrons pass through an aperture in the anode without interception. The Pierce gun for generating a cylindrical beam is based on a spherical space-charge limited diode. A non-emitting focusing electrode, which is a continuation of the cathode, and the anode nose are so shaped that the electrons flow in a convergent cone. The angle of convergence is reduced by the lens action of the anode aperture and by space-charge forces. The design of Pierce guns is discussed in detail including the effects of thermal velocities and the shaping of the magnetic field as the beam enters a magnetic focusing system. Pierce guns can also be designed for hollow beams and sheet beams. The current in the beam can be controlled by a grid or a modulating anode. In a Kino gun a planar, cut-off, magnetron diode is used for injecting a sheet beam into a crossed-field focusing system. The magnetron injection gun, based on a cut-off magnetron diode in which the cathode is a truncated cone, forms a hollow electron beam in the axial direction for injection into a longitudinal magnetic field.
Type
Chapter
Information
Microwave and RF Vacuum Electronic Power Sources , pp. 352 - 374
Publisher: Cambridge University Press
Print publication year: 2018

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References

Shibata, C. et al., ‘High-power (500 kW) c.w. magnetron for industrial heating’, Electrical Engineering in Japan, vol. 111, pp. 94–100, 1991.CrossRefGoogle Scholar
Bennett, W. P., ‘Large-power-tube design, processing and testing’, in R. S. Burnap, ed., Electron Tube Design. Harrison, NJ: RCA, pp. 763–791, 1962.Google Scholar
Gilmour, A. S., Jr., Klystrons, Traveling Wave Tubes, Magnetrons, Crossed-Field Amplifiers and Gyrotrons. Norwood, MA: Artech House, 2011.Google Scholar
Faillon, G., ‘Technical and industrial overview of RF and microwave tubes for fusion’, Fusion Engineering and Design, vol. 46, pp. 371–381, 1999.CrossRefGoogle Scholar
Sivan, L., Microwave Tube Transmitters. London: Chapman and Hall, 1994.Google Scholar
Varian, Technical Manual: Installation, Operation, Maintenance, Care and Handling Instructions, General: Microwave Tubes, Magnetron Tubes, Electron Tubes, Publication no. T.0.00-25-251, 1 October 1979.Google Scholar
Sterzer, F., ‘Improvement of traveling-wave tube efficiency through collector potential depression’, IRE Transactions on Electron Devices, vol. 5, pp. 300–305, 1958.CrossRefGoogle Scholar
Wolkstein, H. J., ‘Effect of collector potential on the efficiency of traveling-wave tubes’, RCA Review, vol. 19, pp. 259–282, 1958.Google Scholar
Mihran, T. G. and Neugebauer, W., ‘Analytical study of a depressed collector for linear beam microwave amplifiers’, NASA Lewis Research Center, Cleveland, OH, 1970.Google Scholar
Kosmahl, H. G., ‘How to quickly predict the overall TWT and the multistage depressed collector efficiency’, IEEE Transactions on Electron Devices, vol. 27, pp. 526–529, 1980.CrossRefGoogle Scholar
Komm, D. S. et al., ‘Advances in space TWT efficiencies’, IEEE Transactions on Electron Devices, vol. 48, pp. 174–176, 2001.CrossRefGoogle Scholar
Okoshi, T. et al., ‘The tilted electric field soft-landing collector and its application to a traveling-wave tube’, IEEE Transactions on Electron Devices, vol. 19, pp. 104–110, 1972.CrossRefGoogle Scholar
Neugebauer, W. and Mihran, T. G., ‘A ten-stage electrostatic depressed collector for improving klystron efficiency’, IEEE Transactions on Electron Devices, vol. 19, pp. 111–121, 1972.CrossRefGoogle Scholar
Kosmahl, H. G. and Ramins, P., ‘Small-size 81- to 83.5-percent efficient 2- and 4-stage depressed collectors for octave-bandwidth high-performance TWT’s’, IEEE Transactions on Electron Devices, vol. 24, pp. 36–44, 1977.CrossRefGoogle Scholar
Ramins, P. and Fox, T. A., ‘90- to 93-percent efficient collector for operation of a dual-mode traveling-wave tube in the linear region’, IEEE Transactions on Electron Devices, vol. 26, pp. 1662–1664, 1979.CrossRefGoogle Scholar
Faillon, G. et al., ‘Microwave tubes’, in Eichmeier, J. A. and Thumm, M. K., eds, Vacuum Electronics: Components and Devices. Berlin: Springer-Verlag, pp. 1–84, 2008.Google Scholar
Kosmahl, H. G., ‘Modern multistage depressed collectors – a review’, Proceedings of the IEEE, vol. 70, pp. 1325–1334, 1982.CrossRefGoogle Scholar
Kosmahl, H. G., ‘A novel, axisymmetric, electrostatic collector for linear beam microwave tubes’, NASA Lewis Research Center, Cleveland, OH, 1971.Google Scholar
Dayton, J. A., Jr. et al., ‘Experimental verification of a computational procedure for the design of TWT-refocuser-MDC systems’, IEEE Transactions on Electron Devices, vol. 28, pp. 1480–1489, 1981.CrossRefGoogle Scholar
Hechtel, J. R., ‘A novel electrostatic-focusing depressed collector for linear beam tubes’, IEEE Transactions on Electron Devices, vol. 24, pp. 45–52, 1977.CrossRefGoogle Scholar
Kumar, L. et al., ‘3-dimensional simulation of multistage depressed collectors on microcomputers’, IEEE Transactions on Electron Devices, vol. 42, pp. 1663–1673, September 1995.CrossRefGoogle Scholar
Coco, S. et al., ‘Shape optimization of multistage depressed collectors by parallel evolutionary algorithm’, IEEE Transactions on Magnetics, vol. 48, pp. 435–438, 2012.CrossRefGoogle Scholar
Petillo, J. et al., ‘The MICHELLE three-dimensional electron gun and collector modeling tool: theory and design’, IEEE Transactions on Plasma Science, vol. 30, pp. 1238–1264, 2002.CrossRefGoogle Scholar
Petillo, J. J. et al., ‘Recent developments to the MICHELLE 2-D/3-D electron gun and collector modeling code’, IEEE Transactions on Electron Devices, vol. 52, pp. 742–748, 2005.CrossRefGoogle Scholar
Ghosh, T. K. and Carter, R. G., ‘Optimization of multistage depressed collectors’, IEEE Transactions on Electron Devices, vol. 54, pp. 2031–2039, 2007.CrossRefGoogle Scholar
Liang, Z. et al., ‘Numerical optimization of a multistage depressed collector with secondary electron emission for an X-band gyro-BWO’, IEEE Transactions on Plasma Science, vol. 37, pp. 2328–2334, 2009.CrossRefGoogle Scholar
Ghosh, T. K., ‘Three-dimensional modelling and optimization of multistage depressed collectors’, PhD, Engineering Department, Lancaster University, Lancaster, UK, 2002.Google Scholar
Curren, A. N. and Fox, T. A., ‘Traveling-wave tube efficiency improvement with textured pyrolytic graphite multistage depressed collector electrodes’, IEEE Electron Device Letters, vol. 2, pp. 252–254, 1981.CrossRefGoogle Scholar
Ramins, P. et al., ‘Verification of an improved computational design procedure for TWT-dynamic refocuser-MDC systems with secondary electron emission losses’, IEEE Transactions on Electron Devices, vol. 33, pp. 85–90, 1986.CrossRefGoogle Scholar
Curren, A. N., ‘Carbon and carbon-coated electrodes for multistage depressed collectors for electron-beam devices: a technology review’, IEEE Transactions on Electron Devices, vol. 33, pp. 1902–1914, 1986.CrossRefGoogle Scholar
Ebihara, B. T. et al., ‘TWT efficiency improvement by a low-cost technique for deposition of carbon on MDC electrodes’, IEEE Transactions on Electron Devices, vol. 34, pp. 490–493, 1987.CrossRefGoogle Scholar
Ramins, P. and Ebihara, B. T., ‘Isotropic graphite multistage depressed collectors – a progress report’, IEEE Transactions on Electron Devices, vol. ED-36, pp. 817–824, 1989.CrossRefGoogle Scholar
Stankiewicz, N., ‘Analysis of spent beam refocusing to achieve optimum collector efficiency’, IEEE Transactions on Electron Devices, vol. 24, pp. 32–36, 1977.CrossRefGoogle Scholar
Dayton, J. A., Jr. et al., ‘Analytical prediction and experimental verification of TWT and depressed collector performance using multidimensional computer programs’, IEEE Transactions on Electron Devices, vol. 26, pp. 1589–1598, 1979.CrossRefGoogle Scholar
Ramins, P. et al., ‘A reexamination of spent beam refocusing for high-efficiency helix TWTs and small MDCs’, IEEE Transactions on Electron Devices, vol. 35, pp. 539–548, 1988.CrossRefGoogle Scholar
EIMAC, Care and Feeding of Power Grid Tubes, 5th ed. San Carlos, CA: CPI Inc. Eimac Division, 2003.Google Scholar
Smith, M. J. and Phillips, G., Power Klystrons Today. Taunton, UK: Research Studies Press, 1995.Google Scholar
Gerlach, P. and Kalfon, C., ‘New technologies in power-grid tubes and their impact in high-power UHF-TV operation’, Proceedings of the IEEE, vol. 70, pp. 1335–1345, 1982.CrossRefGoogle Scholar
EEV, ‘Preamble – Tetrodes’, ed. Chelmsford, UK: Teledyne e2v, 1976.Google Scholar

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