| Paper | Title | Page |
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| MOPPH004 | Effect of Energy Spread on Start Current of Smith-Purcell BWO | 13 |
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| We perform a linear analysis of Maxwell-Vlasov equations for Smith-Purcell Backward Wave Oscillator, including the energy spread of the initial beam distribution. The expression for start current as a function of energy spread is obtained and its dependence on energy spread is discussed. The effect of beam emittance is also included through equivalent energy spread. Results of linear analysis are compared with full nonlinear numerical simulations. | ||
| MOPPH037 | Smith-Purcell BWO with Electron Beam Focussing | 67 |
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We have recently studied the electron beam requirement for successful operation of Smith-Purcell Backward Wave Oscillator and found that one requires a flat electron beam*. Without focussing, the rquirement leads to a very stringent condition on vertical emittance. In this paper, we discuss another way to produce flat beam by focussing the electron beam and show that the method leads to an improved performance of Smith-Purcell FEL.
* K.-J. Kim and V. Kumar, Phys. Rev. ST Accel. Beams 10, 080702 (2007). |