ELECTRON BEAM FOCUSING WITH PERIODIC MAGNET STRUCTURES

【摘要】 <正> Ⅰ. INTRODUCTION The problem of focusing electron beams by periodic magnetic fields has been studied by many authors, e.g., Brewer, Clogston and Heffner, and Mendel, Quate and Yocum. In their studies, it has been assumed that the electron beams are emerging from cathodes completely shielded from the magnetic field. Chang and Mendel have extended these studies to cover the更多还原