Investigation of non-rectangular RF pulse influence in emitted electron beam of the thermionic rf-gun at the linac-based THZ facilty in Thailand

• Main Authors: Damminsek K., Rimjaem S.
• Format: Conference or Workshop Item
• Published: 2015
• Online Access: http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84884394745&origin=inward; http://cmuir.cmu.ac.th/handle/6653943832/38702
• Institution: Chiang Mai University

An electron gun of a linac-based THz radiation source at the Plasma and Beam Physics (PBP) Research Facility at Chiang Mai University (CMU) in Thailand is a 1-1/2 cell S-band standing wave RF cavity with an Os/Ru coating tungsten dispenser cathode. The electron current density of a few A/cm2 can be achieved from zero-field thermionic emission using this cathode type at a desired operating temperature. However, non-rectangular RF pulse shape has a significant influence on the acceleration of electrons inside the RF cavity, which leads to the properties of the output electron beam from a thermionic RF-gun. Numerical and experimental studies on the contribution of the effect have been carried out. Results of the investigations are presented and discussed in this contribution. Copyright © 2012 by the respective authors.