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Contribution Poster

Budker INP - 2nd and 3rd floors

Properties of quarter wavelength coaxial cavity for triode-type thermionic RF gun


  • Mr. Konstantin TORGASIN

Primary authors



Some infrared FEL facilities apply thermionic RF guns due to their advantage of compactness and cost effectiveness as compared to RF photocathode electron guns. Other remarkable advantages are the long lifetime and low vacuum condition requirements. On the other hand thermionic RF guns are suffering from back-bombardment phenomena, which limits the bunch charge and macro-pulse duration. In order to overcome this disadvantage a novel configuration named as triode-type thermionic RF gun, which has an additional small pre-bunching cavity around the cathode, was developed at Institute of Advanced Energy (IAE), Kyoto University. The triode concept has already been proved by numerical simulation. For a proof of principle experiment, a quarter wave pre-bunching cavity was fabricated. The cold test of the quarter wave pre-bunching cavity at high and low RF power has been completed. In this work we report results of hot test of the cavity.