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2011•Nuclear TechniquesRequires access

The development of a Φ100mm scandate cathode

Pan Haifeng

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Abstract

For kA thermal emission current of electron beams,we developed a Φ100 mm scandate cathode,and established a 2 MV injector test stand with the large area thermionic cathode.Experiment results showed that under the diode voltage of 1.95 MV,pulse width at 120 ns(FWHM),cathode temperature at 1120°C,the maximum emission current was 1038 A,with an emission current density of about 13 A/cm2.The results also indicates that under these conditions,the cathode is still working in the space-charge limited current state.

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What this paper is about

For kA thermal emission current of electron beams,we developed a Φ100 mm scandate cathode,and established a 2 MV injector test stand with the large area thermionic cathode.Experiment results showed that under the diode voltage of 1.95 MV,pulse width at 120 ns(FWHM),cathode temperature at 1120°C,the maximum emission current was 1038 A,with an emission current density of about 13 A/cm2.The results also indicates that under these conditions,the cathode is still working in the space-charge limited current state.

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Available abstract

For kA thermal emission current of electron beams,we developed a Φ100 mm scandate cathode,and established a 2 MV injector test stand with the large area thermionic cathode.Experiment results showed that under the diode voltage of 1.95 MV,pulse width at 120 ns(FWHM),cathode temperature at 1120°C,the maximum emission current was 1038 A,with an emission current density of about 13 A/cm2.The results also indicates that under these conditions,the cathode is still working in the space-charge limited current state.

Key concepts: Cathode, Thermionic emission, Full width at half maximum, Materials science, Current (fluid), Hot cathode, Diode, Current density

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