A comparative study of PPM and solenoid focusing in multibeam electron gun

Ashok Kumar Nehra1, R K Sharma, and Y Choyal
Microwave Tubes Division, CEERI Pilani / School of Physics, Devi Ahilya University

This paper represents the comparison of periodic permanent magnet (PPM) and solenoid focusing for dual anode multi-beam electron gun using OPERA3D code. The electron gun has been operated at 6 kV having 75 mA beam current with 0.45 mm beam waist radius. The design has an additional feature of cathode protection from ion bombardment with the application of extra ion barrier anode.

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