Development of high-average power FEL amplifiers using sheet electron beams and short-period wigglers

D. J. Radack, S. W. Bidwell, T. M. Antonsen, J. H. Booske, Y. Carmel, W. W. Destler, H. P. Freund, V. L. Granatstein, P. E. Latham, B. Levush, W. P. Marable, I. D. Mayergoyz, J. Rodgers, Z. X. Zhang