
Professor
Chu,KwoRay




Office：88635742525(PHYS R713)
Laboratory： High Frequency Electrodynamics Laboratory
Lab Tel：88635742560(PHYS
R120)
Fax：88635723052
Email：krchu@phys.nthu.edu.tw 


Education 
 19681972 Ph.D. in Applied Physics, Cornell University Physics
 19661968 M.S. in Physics, University of Massachusetts, U.S.A.
 19611965 B.S. in Physics, National Taiwan University, R.O.C.


Professional Experience 
Current
position：
 1983present, Professor, Dept. of Physics, National Tsing Hua University, R.O.C.
Experience：
 19731978, Research Scientist, Science Applications International Corporation, Virginia, U.S.A.
 19781980, Research Physicist, U.S. Naval Research Laboratory
 19801983, Supervisory Research Physicist, U.S. Naval Research Laboratory


Honors and Awards 
 1986, Outstanding Research Award in Physics, National Science Council, Taiwan, R.O.C.
 1988, Outstanding Research Award in Physics, National Science Council, Taiwan, R.O.C.
 1990, Outstanding Research Award in Physics, National Science Council, Taiwan, R.O.C.
 1992, Outstanding Research Award in Physics, National Science Council, Taiwan, R.O.C.
 1994, Outstanding Research Award in Physics, National Science Council, Taiwan, R.O.C.
 1996, Award for Outstanding Principal Investigators, National Science Council
 1997, National Chair Professorship , Ministry of Education, Taiwan, R.O.C.
 2001, Research Achievement Award, Ministry of Education
 2002, Academician, Academia Sinica
 2003, Presidential Science Prize
 2004, Outstanding in Science and Technology Award, Government Information Office
 2006, Outstanding Contribution Award,The Phi Tau Phi Honor Society
 Fellow of The Physical Society of Republic of China
 Tsing Hua Professor of Natural Sciences
 Plasma Physics Award of IEEE
 Button Prize of Institute of Physics, UK


Research Fields 
 Plasma phycics
 coherent radiation sources
 applied electordynamics


Research Interests and achievement 
Updated on September 3, 2006
Kwo Ray Chu specializes in plasma physics and, in
particular, the generation of coherent electromagnetic
waves via the electron cyclotron maser (ECM) interaction.
The ECM is based on a stimulated cyclotron emission
process involving energetic electrons in gyrational
motion. It constitutes a cornerstone of relativistic
electronics, a discipline that has emerged from our
understanding and utilization of relativistic effects
for the generation of coherent radiation from free
electrons. Over a span of four decades, the ECM has
undergone a remarkably successful evolution from basic
research to
device implementation while continuously being enriched
by new physical insights. By delivering unprecedented
power levels, ECMbased devices have occupied a unique
position in the millimeter and submillimeter regions
of the electromagnetic spectrum, and find use in numerous
applications such as fusion plasma heating, advanced
radars, industrial processing, materials characterization,
particle acceleration, and tracking of space objects.
His academic activities include (1) indepth mathematical
formulation and physics studies of the ECM in the framework
of relativistic kinetic equations, which led to the
discovery of a competitive relationship between the
fastwave ECM and the slowwave Weibel instabilities
and provided a definitive identification of the physical
mechanism responsible for the cyclotron emission observed
in early experiments; (2) development of a fully relativistic
theory which led to the design and subsequent demonstration
(at the University of Maryland) of a 10 GHz gyroklystron
at a power level (30 MW) two orders of magnitude beyond
the stateoftheart, a scheme currently explored
at CERN for component tests of nextgeneration accelerators;
(3) invention, fundamental studies, and demonstration
of a novel Kaband gyrotron traveling wave amplifier
with record performance in bandwidth, power, gain,
and efficiency, which is under further development
in the US for the upgrade of space radars; and (4)
participation in national scientific programs, in particular,
the synchrotron light source project, defense electronics
system research, and the establishment of Taiwan's
microwave tube industry.
He is a winner of the NSC
Outstanding Research Award, the MOE National Chair,
the MOE Academic Award, the Presidential Science
Prize, the Executive Yuan Science and Technology Award,
the IEEE Plasma Science and Application Award, the British
Institute of Physics K J Button Medal and Prize.
He is Fellow of the ROC Physical Society, American
Physical Society, and IEEE, and Academician of Academia Sinica.


Selected
Publications 
 [2005] K. F. Pao, T. H. Chang, C. T. Fan, S. H. Chen, C. F. Yu, and K. R. Chu, “Dynamics of Mode Competition in the Gyrotron BackwardWave Oscillator,” Phys. Rev. Lett. 95, 185101 (2005).
 [2004] K. R. Chu, “The Electron Cyclotron Maser,” Rev. of Modern Phys. 76, 489 (2004).
 [2002] S. H. Chen, T. H. Chang, K. F. Pao, and K. R. Chu, " Study of Axial Modes in Gyrotron BackwardWave Oscillators," Phys. Rev. Lett. 89, 268303 (2002).
 [2001] T. H. Chang, S. H. Chen, L. R. Barnett, and K. R. Chu, "Characterization of Stationary and Nonstationary Behavior of Gyrotron Backward Wave Oscillator," Phys. Rev. Lett. 87, 064802 (2001).
 [2000] S. H. Chen, K. R. Chu, and T. H. Chang, "Saturated Behavior of Gyrotron BackwardWave Oscillator," Phys. Rev. Lett. 85, 2633 (2000).
 [1998] K. R. Chu, H. Y. Chen, C. L. Hung, T. H. Chang, L. R. Barnett, S. H. Chen, and T. T. Yang, “An Ultra High Gain Gyrotron Traveling Wave Amplifier,” Phys. Rev. Lett. 81, 4760 (1998).
 [1997] K. R. Chu, H. Guo, and V. L. Granatstein, “Theory of the Harmonic Multiplying Gyrotron Traveling Wave Amplifier,” Phys. Rev. Lett. 78, 4661 (1997).
 [1995] K. R. Chu, L. R. Barnett, H. Y. Chen, S. H. Chen, Ch. Wang, Y. S. Yeh, Y. C. Tsai, T. T. Yang, and T. Y. Dawn, "Stabilization of Absolute Instabilities in the Gyrotron Travelling Wave Amplifier," Phys. Rev. Lett. 74, 1103 (1995).
 [1993] C. S. Kou, S. H. Chen, L. R. Barnett, H.Y. Chen, and K. R. Chu, "Experiments Study of an Injection Locked Gyrotron Backwave Wave Oscillator," Phys. Rev. Lett. 70, 924 (1993).
 [1991] K. R. Chu and A. T. Lin, "Harmonic Gyroresonance of Electrons in Combined Helical Wiggler and Axial Guide Magnetic Fields," Phys. Rev. Lett. 67, 3235 (1991).
 [1989] L. R. Barnett, L. H. Chang, H. Y. Chen, K. R. Chu, W. K. Lau and C. C. Tu, "Absolute Instability Competition and Suppression in a MillimeterWave Gyrotron TravelingWave Amplifier," Phys. Rev. Lett. 63, 1062 (1989).
 [1985] K. R. Chu, V. L. Granatstein, P. E. Latham, W. Lawson, and C. D. Striffier, "A 30 MW Gyroklystron Amplifier Design for High Energy Linear Accelerators," IEEE Trans. Plasma Science PS13, 424 (1985).


 All
Publications (Expansible)
A. Refereed Papers:
 K.R. Chu, N. Rostoker, "Relativistic Electron Beam Neutralization in a Dense Magnetized Plasma," Phys. of Fluids 16, 1472 (1973).
 K.R. Chu, N. Rostoker, "Interaction of a Rotational Relativistic Electron Beam with a Magnetized Plasma," Phys. of Fluids 17, 813 (1974).
 C.A. Kapetanakos, W.M. Black, and K.R. Chu, "Plasma Heating by a Rotating Relativistic Electron Beam," Phys. Rev. Letter. 34, 1156 (1975).
 K.R. Chu, R.W. Clark, M. Lampe, P.C. Liewer and W.M. Manheimer, "Ion Heating by Expansion of BeamHeated Plasma," Phys. Rev. Lett. 35, 94 (1975).
 C.A. Kapetanakos, R.K. Parker, and K.R. Chu, "Formation of FieldReversing Ion Rings Using Microsecond Ion Pulses," Applied Phys. Lett. 26, 284 (1975).
 K.R. Chu, C.A. Kapetanakos and R.W. Clark, "Energy Deposition into Dense Collisionless Plasmas by Rotating Beams," Applied Phys. Lett. 27, 185 (1975).
 K.R. Chu, C.A. Kapetanakos, "Steady State Thermonuclear Power Generation in a TwoEnergy Component Astron Device," Nuclear Fusion 15, 947 (1975).
 W.M. Manheimer, K.R. Chu, E. Ott and J.P. Boris, "Marginal Stability Calculation of Electron Temperature Profiles in Tokamaks," Phys. Rev. Lett. 37, 286 (1975).
 W.M. Manheimer, M. Lampe, R.W. Clark and P.C. Liewer, and K.R. Chu, "A Test for the Viability of Fluid Codes in the Collisionless Regime," Phys. of Fluids 19, 1788 (1976).
 W.M. Manheimer, E. Ott, K.R. Chu, J.P. Boris and J.D. Callen, "Mode Coupling Stabilization of the Dissipative Trapped Electron Instability," Nuclear Fusion 16, 203 (1976).
 K.R. Chu and R.W. Clark, "Dynamical Model for Magnetic Signal Interpretation in Relativistic Electron Beam Heated Plasmas," Phys. Rev. Lett. 38, 704 (1977).
 C.A. Kapetanakos, J. Golden, and K.R. Chu, "Rigid Rotor Equilibrium of a Strong Ion Layer, Plasma Physics 19, 387 (1977).
 K.R. Chu and W.M. Manheimer, "Numerical Study of the the Dissipative TrappedElectron Instability in Tokamaks," Nuclear Fusion 18, 29 (1978).
 K.R. Chu and J.L. Hirshfield, "Comparative Study of the Azimuthal and Axial Bunching Mechanisms in Electromagnetic Cyclotron Instabilities," Phys. of Fluids 21, 461 (1978).
 K.R. Chu, E. Ott and W.M. Manheimer, "Effects of Crosssectional Elongation on Trapped Electron Modes," Phys. of Fluids 21, 664 (1978).
 K.R. Chu, "Theory of Electron Cyclotron Maser Interaction in a Cavity at the Harmonic Frequencies," Phys. of Fluids 21, 2354 (1978).
 J.L. Hirshfield, K.R. Chu, and S. Kainer, "Frequency Upshift for Cyclotron Wave Instability on a Relativistic Electron Beam," Applied Phys. Lett. 33, 847 (1978).
 H. Uhm, R.C. Davidson, and K.R. Chu, "Self Consistent Theory of Cyclotron Maser Instability for Intense Hollow Electron Beams," Phys. of Fluids 21, 1866 (1978).
 H. Uhm, R.C. Davidson, and K.R. Chu, "Cyclotron Maser Instability for General Magnetic Hatmonic Number," Phys. of Fluids 21, 1877 (1978).
 A.K. Ganguly and K.R. Chu, "Theory of Solid State Cyclotron Maser," Physical Rev. B 18, 6880 (1978).
 K.R. Chu, A.T. Drobot, V.L. Granatstein and J.L. Seftor, "Characteristics and Optimum Operating Parameters of a Gyrotron Traveling Wave Amplifier," IEEE Trans. Microwave Theory and Techniques, MTT27, 178 (1979).
 J.L. Seftor, A.T. Drobot, and K.R. Chu, "An Investigation of a Magnetron Injection Gun Suitable for Use in Cyclotron Resonance Masers," IEEE Trans. Electron Devices, ED26, 1609 (1979).
 J.L. Seftor, V.L. Granatstein, K.R. Chu, P. Sprangle and M.E. Read, "The Electron Cyclotron Maser as a High Power Traveling Wave Amplifier of Millimeter Waves," IEEE J. Quantum Electronics Vol. QE15, 848 (1979).
 L.R. Barnett, K.R. Chu, J.M. Baird, V.L. Granatstein and A.T. Drobot, "Gain, Saturation, and Bandwidth Measurements of the NRL Gyrotron Traveling Wave Amplifier," IEDM Tech. Dig. 164 (1979).
 K.R. Chu, A.T. Drobot, H.H. Szu and P. Sprangle, "Theory and Simulation of the Gyrotron Traveling Wave Amplifier Operating at Cyclotron Harmonics," IEEE Trans. Microwave Theory and Techniques, MTT28, 313 (1980).
 K.R. Chu, M.E. Read and A.K. Ganguly, "Methods of Efficiency Enhancement and Scaling for the Gyrotron Oscillator," IEEE Trans. Microwave Theory and Techniques, MTT28, 318 (1980).
 E. Ott, B. Hui, and K.R. Chu, "Theory of Electron Cyclotron Resonance Heating of Tokamak Plasmas," Phys. Fluids 23, 1031 (1980).
 B. Hui, K.R. Chu, E. Ott and T. Antonsen, "Theory of Second Harmonic Electron Cyclotron Resonance Heating of Tokamak Plasma," Phys. Fluids 23, 822 (1980).
 R.M. Gilgenbach et al. (15 authors), "Heating at the Electron Cyclotron Frequency in the SXB Tokamak," Phys. Rev. Lett. 44, 647 (1980).
 J.D. Silverstein, M.E. Read, K.R. Chu, and A.T. Drobot, "Practical Considerations in the Design of a High Power 240 GHz Gyromonotron," IEEE Trans. Microwave Theory and Techniques, MTT28, 962 (1980).
 M.E. Read, R.M. Gilgenbach, R.F. Lucey, K.R. Chu, A.T. Drobot, and V.L. Granatstein, "Spatial and Temporal Coherence of a 35 GHz Gyromonotron Using the TE01 Circular Mode," IEEE Trans. Microwave Theory and Techniques, MTT28, 875 (1980).
 L.R. Barnett, J.M. Baird, Y.Y. Lau, K.R. Chu, and V.L. Granatstein, "A High Gain Single Stage Gyrotron Traveling Wave Amplifier," IEEEIEDM Tech. Dig. 314 (1980).
 K.R. Chu, A.K. Ganguly, V.L. Granatstein, J.L. Hirshifield, S.Y. Park, and J.M. Baird, "Theory of a Slow Wave Cyclotron Amplifier," Int. J. Electronics 51, 493 (1981).
 Y.Y. Lau, K.R. Chu, L.R. Barnett, V.L. Granatstein, "Analysis of Osciliations in the Gyrotron Traveling Wave Amplifier," Int. J. Infrared and Millimeter Waves 2, 373 (1981).
 Y.Y. Lau, K.R. Chu, L.R. Barnett, and V.L. Granatstein, "Effects of Veiocity Spread and Wall Resistivity on the Gain and Bandwidth of the Gyrotron TravelingWave Amplifier," Int. J. Infrared and Millimeter Waves 2, 395 (1981).
 Y.Y. Lau and K.R. Chu, "Gyrotron Traveling Wave AmplifierA Proposed Wideband Fast Wave Amplifier," Int. J. Infrared and Millimeter Waves 2, 415 (1981).
 K.R. Chu, "Analysis of a Basic Electron Cyclotron Maser Model," J. of Chinese Institute of Engineers 4, 85 (1981).
 K.R. Chu, Y.Y. Lau, L.R. Barnett, and V.L. Granatstein, "Theory of a Wideband Distributed Gyrotron Traveling Wave Amplifier," IEEE Tran. Electron Devices, ED28, 866 (1981).
 L.R. Barnett, Y.Y. Lau, K.R. Chu, V.L. Granatstein, "An Experimental Wideband Gyrotron Travelling Wave Amplifier," IEEE Trans. Electron Devices, ED28, 872 (1981).
 K.J. Kim, M.E. Read, J.M. Baird, K.R. Chu, A.T. Drobot, J. Vomvoridis, A.K. Ganguly, D. Dialetis, and V.L. Granatstein, "Design Consideration of a MW CW Gyrotron", Int. J. Electronics 51, 427 (1981).
 A.K. Ganguly and K.R. Chu, "Analysis of TwoCauity Gyroklystron", Int. J. Electronics 51, 503 (1981).
 M.E. Read, K.R. Chu, and K.J. Kim, "Power Limits in Cylindrical Gyromonotrons Using TEon modes," Int. J. Infrared and MM Waves 2, 159 (1981).
 Y.Y. Lau, J.M. Baird, L.R. Barnett, K.R. Chu, and V.L. Granatstein, "Cyclotron Maser Instability as a Resonant Limit of Space Charge Wave," Int. J. Electronics 51, 331 (1981).
 Y. Carmel, A.K. Ganguly, D. Dialetis, R. Seeley, M. Read, K.R. Chu, J.S. Levine and V.L. Granatstein, "A High Power Complex Cauity Gyrotron for Fusion Research Devices", IEDM Tech. Digest, 372 (1982).
 M.E. Read, K.R. Chu, and A.J. Dudas, "Experimental Examination of the Enhancement of Gyrotron Efficiency by Use of Profiled Magnetic Fields", IEEE Trans. Microwave Theory and Techniques, MTT30, 42 (1982).
 Q.F. Li, and K.R. Chu, ""Analysis of Open Resonators," Int. J. Infrared and MM Waves 3, 705 (1982).
 B. Arfin, K.R. Chu, D. Dialetis, and M.E. Read, "A High Power Gyrotron Operating in the TEo41 Mode," IEEE Trans. Electron Devices, ED29, 1911 (1982).
 Y. Carmel, K.R. Chu, M.E. Read, K.J. Kim, B. Arfin, D. Dialetis and A. Fliflet, "Mode Competition, Suppression, and Efficiency Enhancement in Overmoded Gyrotron Oscillators," Int. J. Infrared and MM Waves 3, 645 (1982).
 T.M. Antonsen and K.R. Chu, "RF Current Generation by Waves in Toroidal Geometry, Phys. Fiulds 25, 1295 (1982).
 A.K. Ganguly, B.Hui, and K.R. Chu, "Nonlinear Analysis of the Solid State Gyrotron Oscillator by the Monte Carlo Method," IEEE Trans. Electron Devices, ED29, 1197 (1982).
 M. Caplan, A.T. Lin, and K.R. Chu, "A Study of the Saturated Output of a TEo1 Gyrotron Using an Electromagnetic Finite Size Particle Code," Int. J. Electronics 53, 659 (1982).
 H. Guo, L. Chen, H. Keren, J.L. Hirshfield, S.Y. Park, and K.R. Chu, "Measurement of Gain for Slow Cyclotron Waves on an Annular Electron Beam," Phys. Rev. Lett. 49, 730 (1982).
 A.W. Filflet, M.E. Read, K.R. Chu and R. Seeley, "A SelfConsistent Field Theory for Gyrotron Oscillators," Int. J. Electronics 53, 505 (1982).
 L.R. Barnett, D. Dialetis, Y.Y. Lau, and K.R. Chu, "Tapered Interaction GyroTWA Experiments," IEDM Tech. Digest, 280 (1983).
 Y.Y. Lau and K.R. Chu, "Electron Cyclotron Maser Instability Driven by Loss Cone Distribution, Phys. Rev. Lett. 50, 243 (1983).
 Y. Carmel, K.R. Chu, M. Read, A.K. Ganguly, D. Dialetis, R. Seeley, J.S. Levine and V.L. Granatstein, "Realization of a Stable and Highly Efficient Gyrotron for Controlled Fusion Research,'' Phys. Rev. Lett. 50, 112 (1983).
 K.R. Chu and B. Hui, "Analysis of Electron Cyclotron Resonance Heating in a Weakly Relativistic Plasma," Phys. Fiulds 26, 69 (1983).
 V.L. Granatstein and K.R. Chu, "Electron Cyclotron Resonance Heating of A Spheromak Plasma," IEEETrans Plasma Science, P512, 144 (1984).
 A.T. Lin, W.W. Chang, and K.R. Chu, "Nonlinear Efficienty and Bandwidth of a Slow Wave Cyclotron Amplifier," Int. J. Infrared and Millimeter Waves. 5, 427 (1984).
 Y. Carmel, K.R. Chu, M.E. Read, V.L. Granatstein, G. FailIon, P. Boulanger, E. Kammercr and G. Mourier, "A Technique to Identify Electromagnetic Modes in Ouersized Waveguides, IEEE Trans. Microwave Theory and Techniques, MTT32, 1493 (1984).
 K.R. Chu and D. Dialetis, "Theory of Harmonic Gyrotron Oscillator with Slotted Resonant Structure," Int. J. Infrared and Millimeter Waves 5, 37 (1984).,
 A.K. Ganguly and K.R. Chu, "Limiting Current in Gyrotrons," Int. J. Infrared and Millimeter Waves 5, 103 (1984).
 V.L. Granatstein, P. Vitello, K.R. Chu, K. Ko, P.E. Latham, W. Lawson, C.D. Striffier and A. Drobot, "Design of Gyrotron Amplifiers for Driving 1 TeV ee+ Linear Colliders," IEEE Trans. Nucl. Sci. NS32, 2957 (1985).
 K.R. Chu, V.L. Granatstein, P.E. Latham, W. Lawson, and C.D. Striffier, "A 30 MW Gyroklystron Amplifier Design for High Energy Linear Accelerators," IEEE Trans. Plasma Science PS13, 424 (1985).
 K.R. Chu, D.S. Furuno, N.C. Luhmann, D.B. McDermott, and P. Vitello, "Theory, Design and Operation of Large Orbit HighHarmonic Gyroklystron Amplifier," IEEE Trans. Plasma Science, PS13, 435 (1985).
 K.R. Chen and K.R. Chu, "Study of a Noise Amplification Mechanism in Gyrotrons," IEEE Trans. Microwave Theory and Techniques, MTT34, 72 (1986).
 K.R. Chu and L.H. Lyu, "Simuiation of Electrostatic Noise Amplification in Gyrotrons," IEEE Trans. Microwave Theory and Techniques, MTT34, 690 (1986).
 A.T. Lin, K.R. Chu, and A. Bromborsky, "Stability and Tunability of a CARM Amplifier ", IEEE Trans. Electron Devices, ED34, 2621 (1987).
 K.R. Chu, P.E. Latham, and V.L. Granatstein, "Penultimate Cavity Tuning of the Gyroklystron Amplifier," Int. J. Electronics, 65, 419 (1988).
 A.T. Lin, C.C. Lin, Z.H. Yang, K.R. Chu, A.W. Fliflet, and S. Gold, "Simulation of Transient Behavior in a Pulse Line Driven Gyrotron Oscillator," IEEE Tran. Plasma. Science", PS16, 135 (1988).
 A.T. Lin, Z.H. Yang, and K.R. Chu, "Particle Simulation of a High Power Gyrotron Oscillator", IEEE Trans. Plasma Science, PS16, 129 (1988).
 K.R. Chu and A.T. Lin, "Gain and Bandwidth of the GyroTWT and CARM Amplifier," IEEE Trans. Plasma Science PS16, 90 (1988).
 F.S. Kuo, and K.R. Chu "Simulation of the Electrostatic Cyclotron Instability in 1D Cylindrical Geometry", Chinese J. Phys. 26, 130 (1988).
 A.T. Lin, C.C. Lin, and K.R. Chu, "Stability of a High Order Mode CARM Amplifier", IEEE Trans. Electron Devices 36, 785 (1989).
 L.R. Barnett, L.H. Chang, H.Y. Chen, K.R. Chu, W.K. Lau and C.C. Tu, "Absolute Instability Competition and Suppression in a MillimeterWave Gyrotron TravelingWave Amplifier", Phys. Rev. Lett. 63, 1062 (1989).
 C.S. Kuo, D.B. McDermott, N.C. Luhmann, and K.R. Chu, "Prebunched High Harmonic Gyrotron", IEEE Tran. Plasma Science, PS18, 343 (1990).
 K.R. Chu, L.R.Barnett, W.L. Lau, L.H. Chang, and H.Y. Chen, "A WideBand MillimeterWavc Gyrotron TravelingWave Amplifier Experiment", IEEE Trans. Electron Devices, ED37, 1557 (1990).
 F.S. Kuo, K.R. Chu, and J.J. Su, "Simulation of the Electrostatic Cyclotron Instability in An Annular Electron Beam", Chinese J. Phys. 28, 327 (1990).
 K.R. Chu, L.R. Barnett, W.K. Lau, L.H. Chang, and C.S. Kou, "Recent Development in Millimeter Wave GyroTWT Research at NTHU", IEEEIEDM Tech. Dig., 699 (1990).
 Q.S. Wang, D.B. McDermott, A.T. Lin, N.C. Luhmann, K.R. Chu, A. Salop, and M. Caplan,"CARM Amplifier Designs for High Power", Int. J. Infrared Millimeter Waves 12, 297 (1991).
 K.R. Chu, L.R. Barnett, W.K. Lau, L.H. Chang, A.T. Lin, and C.C. Lin, "Nonlinear Dynamics of the Gyrotron Traveling Wave Amplifier", Phys. Fluids B3, 2403 (1991).
 K.R. Chu and A.T. Lin, "Harmonic Gyroresonance of Electrons in Combined Helical Wiggler and Axial Guide Magnetic Fields", Phys. Rev. Lett. 67, 3235 (1991).
 A.T. Lin, C.C. Lin, and K.R. Chu, "Effects of Superradiant Modes on the Performance of Free Electron Laser Amplifiers", Applied Phys. Lett. 60, 292 (1992).
 A.T. Lin, K.R. Chu, C.C. Lin, C.S. Kou, D.B. McDermott, and N.C. Luhmann, Jr., "Marginal Stability Design Criterion for GyroTWT's and Comparison of Fundamental with Second Harmonic Operation", Int. J. Electronics 72, 873 (1992).
 C.S. Kou, Q.S. Wang, D.B. McDermott, A.T. Lin, K.R. Chu, and N.C. Luhmann, Jr., "High Power Harmonic GyroTWT's: I. Linear Theory and Oscillation Study, IEEE Trans. Plasma Science 20, 155 (1992).
 Q.S. Wang, D.B. McDermott, C.S. Kou, A.T. Lin, K.R. Chu, and N.C. Luhmann, Jr., "High Power Harnomic GyroTWT's: II. Nonlinear Theory and Design", IEEE Trans. Plasma Science 20, 163 (1992).
 K.R. Chu, C.S. Kou, J.M. Chen, Y.C. Tsai, C. Cheng, S.S. Bor, and L.H. Chang, "Spectral Domain Analysis of Open Cavities", Int. J. Infrared and Millimeter Waves 13, 1571 (1992).
 C.S. Kou, S.H. Chen, L.R. Barnett, H.Y. Chen, and K.R. Chu, "Experiments Study of an Injection Locked Gyrotron Backwave Wave Oscillator", Phys. Rev. Lett. 70, 924 (1993).
 A.T. Lin and K.R. Chu, "A Harmonic FEL Based on the Second Harmonic Gyroresonance", Nuc. Instru. and Methods in Phys. Res. A331, 541 (1993).
 Q. S. Wang, D. B. McDermott, C. K. Chong, C. S. Kou, K. R. Chu, and N. C. Luhmann, Jr., "Stable 1MW Third Harmonic GyroTWT Amplifier", IEEE Trans. Plasma Science 22, 608 (1994).
 D. B. McDermott, C. K. Chong, N. C. Luhmann, Jr., and K. R. Chu, "High Harmonic Slotted Gyroklystron Amplifier: Linear Theory and Nonlinear Simulation", IEEE Trans. Plasma Science 22, 920 (1994).
 F. V. Hartemann, S. N. Fochs, J. D. McNally, S. Burns, N. C. Luhmann, Jr., M. D. Perry, and K. R. Chu, "Coherent Photoelectron Bunch Generation and Quantum Efficiency Enhancement in a Photocathode Optical Resonator", Appl. Phys. Lett. 65, 2404 (1994).
 K. R. Chu, L. R. Barnett, H. Y. Chen, S. H. Chen, Ch. Wang, Y. S. Yeh, Y. C. Tsai, T. T. Yang, and T. Y. Dawn, "Stabilization of Absolute Instabilities in the Gyrotron Travelling Wave Amplifier", Phys. Rev. Lett. 74, 1103 (1995).
 C. S. Kou, K. R. Chu, D. B. McDermott, and N. C. Luhmann, Jr., "Effective Bandwidth and the Kompfner Dip for Cyclotron Autoresonance Maser Amplifiers", Phys. Rev. E51, 642 (1995).
 P. Schonfeld, E. Wiehreter, Y. C. Tsai, and K. R Chu, “Layout of a Broadband Circular Waveguide to Coaxial Transition”, in Proceedings of 5th European Particle Accelerator Conf. (Barcelona, June, 1996).
 Ch. Wang, Y. S. Yeh, T. T. Yang, H. Y. Chen, S. H. Chen, Y. C. Tsai, L. R. Barnett, and K. R. Chu, “A Mechanically Tunable Magnetron Injection Gun”, Rev. Sci. Instru. 68, 3031 (1997).
 K. R. Chu, H. Guo, and V. L. Granatstein, “Theory of the Harmonic Multiplying Gyrotron Traveling Wave Amplifier”, Phys. Rev. Lett. 78, 4661 (1997).
 C.L. Hung, Y.C. Tsai, and K.R. Chu, “A Study of Open Cavities by the Field Energy Method”, IEEE Trans. Plasma Science 26, 931 (1998).
 K.R. Chu, H.Y. Chen, C.L. Hung, T.H. Chang, L.R. Barnett, S.H. Chen, and T.T. Yang, “An Ultra High Gain Gyrotron Traveling Wave Amplifier”, Phys. Rev. Lett. 81, 4760 (1998).
 T. H. Chang, L. R. Barnett, K. R. Chu, F. Tai, and C. L. Hsu, “Dualfunction Circular Polarization Converter for Microwave / Plasma Processing Systems”, Rev. Sci. Instru. 70, 1530 (1999).
 K. R. Chu, H. Y. Chen, C. L. Hung, T. H. Chang, L. R. Barnett, S. H. Chen, T. T. Yang, and D. Dialetis, “Theory and Experiment of Ultrahigh Gain Gyrotron Traveling Wave Amplifier”, invited paper, IEEE Trans. Plasma. Sci. 27, 391 (1999).
 L. Chen, H. Guo, H. Y. Chen, M. H. Tsao, T. T. Yang, Y. C. Tsai, and K. R. Chu, “An Extended Interaction Oscillator Based on a Complex Resonator Structure”, , IEEE Tran. Plasma Sci. (June, 2000).
B. Book Chapters:
 D. Dialetis and K.R, Chu, "Mode Competition and Stability Analysis of the Gyrotron Oscillator, In "Infrared and Millimeter Waves", Vol. 7, (Edited by K.J. Button, Academic Press), Ch. 10 (1983).
 K.R. Chu and D. Dialetis, "Kinetic Theory of Harmonic Gyrotron Oscillator with Slotted Resonant Structure, In Infrared and Millimeter Waves, Vol. 13, (Edited by K.J. Button, Academic Press), Ch.3. (1985).
 K.R. Chu, "Theory of Electron Cyclotron Resonance Heating," In Wave Heating and Current Drive In Plasmas (Edited by V.L. Granatstein and P.L. Colestock, Gordon and Breach Science Publishers, Inc.), Ch. 7. (1985).
C. Patents:
 V.L. Granatstein, P.S. Sprangle, A.T. Drobot, K.R. Chu, and J.L. Seftor, "Gyrotron Travelling Wave Amplifier," U.S. Patent No. 4224576 (1980).
 K.R. Chu, P.A. Sprangle and V.L. Granatstein, "Slow Wave Wideband Cyclotron Amplifier," U.S. Patent No. 4362968 (1982).
 P.A. Sprangle, R.A. Smith, K.R. Chu, and M.E. Read, "High Efficiency Gyrotron Oscillator and Amplifier," U.S. Patent No. 4370621 (1983).
 A.K. Ganguly, K. Davis, and K.R. Chu, "Solid State Cyclotron Maser," U.S. Patent No. 4376917 (1983).
 Y.Y. Lau, K.R. Chu, V.L. Granatstein and L.R. Barnett, "Wideband Gyrotron Traveling Wave Amplifier," U.S. Patent No. 4553875 (1985).
 M.E. Read, Y. Carmel, K.R. Chu, and A.K. Ganguly, "Complex Cavity Gyrotron," U.S. Patent No. 4554484 (1985).
 L.R. Barnett, Y.Y. Lau, K.R. Chu, and V.L. Granatstein, "Wideband Distributed rf Coupler, U.S. Patent No. 4567401 (1986).
 K. R. Chu, L. R. Barnett, C. Wang, Y. S. Yeh, T. T. Yang, H. Y. Chen, S. H. Chen, Y. C. Tsai, and T. Y. Dawn, “Mechanically Tunable Magnetron Injection Gun”, U. S. Patent No. 5814939 (1998).
 王兆恩，葉義生，楊滋德，陳漢穎，陳仕宏，蔡頤錦，董傳義，朱國瑞，柏賴德，”機械可調式磁控電子鎗”，中華民國專刊，新型第139906號(1999).
 陳麗明，郭和忠，陳漢穎，楊滋德，蔡穎錦，朱國瑞，”複合分佈作用諧振腔及複合分佈作用振盪器”，中華民國專利（申請中）。
 L. Chen, H. Guo, H. Y. Chen, M. H. Tsao, T. T. Yang, Y. C. Tsai, and K. R. Chu, “A Complex Extended Interaction Oscillator with a Builtin Coaxial Coupling and Bunching Section”, U.S. Patent.（申請中）
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