Absolute instability in a traveling wave tube model
dc.contributor.author | Ang, L. K. | en_US |
dc.contributor.author | Lau, Y. Y. | en_US |
dc.date.accessioned | 2010-05-06T21:59:11Z | |
dc.date.available | 2010-05-06T21:59:11Z | |
dc.date.issued | 1998-12 | en_US |
dc.identifier.citation | Ang, L. K.; Lau, Y. Y. (1998). "Absolute instability in a traveling wave tube model." Physics of Plasmas 5(12): 4408-4410. <http://hdl.handle.net/2027.42/70326> | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/70326 | |
dc.description.abstract | A model is constructed to evaluate absolute instability which may lead to bandedge oscillations in a traveling wave tube. Under the assumptions (a) that all modes have forward group velocities, and (b) that the slow wave structure has a parabolic dispersion relation in the ω-kω-k plane, the threshold coupling constant (Pierce’s parameter CC) is calculated for the onset of absolute instability. The effect of distributed resistive loss in the circuit is included. The axial wave number and the characteristic frequency of the oscillation at the onset are given. © 1998 American Institute of Physics. | en_US |
dc.format.extent | 3102 bytes | |
dc.format.extent | 95256 bytes | |
dc.format.mimetype | text/plain | |
dc.format.mimetype | application/pdf | |
dc.publisher | The American Institute of Physics | en_US |
dc.rights | © The American Institute of Physics | en_US |
dc.title | Absolute instability in a traveling wave tube model | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Physics | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109-2104 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/70326/2/PHPAEN-5-12-4408-1.pdf | |
dc.identifier.doi | 10.1063/1.873178 | en_US |
dc.identifier.source | Physics of Plasmas | en_US |
dc.identifier.citedreference | D. R. Whaley, C. M. Armstrong, B. Gannon, G. Groshart, E. Hurt, J. Hutchins, M. Roscoe, T. M. Antonsen, Jr., and B. Levush, IEEE Trans. Plasma Sci. ITPSBD26, 912 (1998). | en_US |
dc.identifier.citedreference | A. S. Gilmour, Traveling Wave Tubes (Artech, Norwood, MA, 1994); B. Epsztein, in IEEE International Electron Device Meeting, Technical Digest, p. 486 (1984), IEEE Catalogue No. CH2099-0/84 (Institute of Electrical and Electronics Engineers, Piscataway, NJ, 1984). | en_US |
dc.identifier.citedreference | R. J. Briggs, Electron Stream Interaction with Plasma (MIT Press, Cambridge, MA, 1964), Chap. 2; A. Bers, in Plasma Physics—Les Houches 1972, edited by C. DeWitt and J. Peyraud (Gordon and Breach, New York, 1975), p. 113. | en_US |
dc.identifier.citedreference | Y. Y. Lau, K. R. Chu, L. R. Barnett, and V. L. Granastein, Int. J. Infrared Millim. Waves IJIWDO2, 373 (1981). | en_US |
dc.identifier.citedreference | S. M. Miller, T. M. Antonsen, B. Levush, A. Bromborsky, D. K. Abe, and Y. Carmel, Phys. Plasmas PHPAEN1, 730 (1994). | en_US |
dc.identifier.citedreference | L. R. Barnett, L. H. Chang, H. Y. Chen, K. R. Chu, W. K. Lau, and C. C. Tu, Phys. Rev. Lett. PRLTAO63, 1062 (1989). | en_US |
dc.identifier.citedreference | Strictly speaking, for a perfect helix, the circuit mode does not have a zero group velocity at the π-mode wavenumber π/L.π/L. See, e.g., Fig 2.9 of D. A. Watkins, Topics in Electromagnetic Theory (Wiley, New York, 1958). However, any slight imperfection in the helix, which is unavoidable in practice, will make kBE = π/LkBE=π/L a zero group velocity wavenumber. We wish to thank David Chernin for pointing this out to us. Carter Armstrong has also kindly informed us that oscillations at the π-mode are of serious concern in the design of TWT. | en_US |
dc.identifier.citedreference | Y. Y. Lau and D. Chernin, Phys. Fluids B PFBPEI4, 3473 (1992). | en_US |
dc.identifier.citedreference | A. K. Ganguly, Y. Y. Lau, and S. Ahn, Phys. Fluids B PFBPEI4, 3800 (1992). | en_US |
dc.owningcollname | Physics, Department of |
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