CSIR-CEERI has been working on design and development dispenser cathodes under CSIR Network project. The design of dispenser cathode required for J-band klystron with 3.0 mm button diameter has been completed (Fig. 1). Fabrication procedure has been established with several repetitions. Emission current densities up to 30 A/cm2 achieved in CW diode configuration. Fig. 2 shows emission characteristics of a dispenser cathode developed at CSIR-CEERI.

Fig. 1: Optical photograph of dispenser cathode

Fig. 2: Emission characteristics of dispenser cathode