On frequency and time domain models of traveling wave tubes
  We discuss the envelope modulation assumption of frequency-domain models of traveling wave tubes (TWTs) and test its consistency with the Maxwell equations. We compare the predictions of usual frequency-domain models with those of a new time domain model of the TWT. 
St\'ephane Th\'eveny (PIIM), Fr\'ed\'eric Andr\'e, Yves Elskens (PIIM)
physics.plasm-ph physics.acc-ph physics.class-ph