EXPERIMENTAL-DESIGN OF HIGH-ENERGY ELECTRON-GUN BY MEANS OF SCALING RULES

The possibility of the design of a new family of electron guns by mean s of scaling theory of electron-optical devices (EOD) is presented. Ac cording to the theory, EOD with a relatively big space charge, as in h igh energy Pierce type electron guns used in technological equipment, generally cannot be scaled, because of their nonlinear space charge na ture. Therefore, the scaling rules are applied here only to the anode zone of the gun, where the electron beam perveance is small, and the c athode lens of gun with considerable space charge remains unchanged. T he procedure for scaling a 25 kV and 150 mA gun with cylindrical elect ron beam into a high voltage 75 kV and 150 mA electron system is given . An experimental investigation proved the high technological quality of a high voltage gun constructed according to the above conception. C opyright (C) 1996 Elsevier Science Ltd