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The generation of high spectral brilliance radiation with electron beam sources relies heavily on the qualities of the electron beam. Achieving a remarkably high electron beam brightness necessitates a combination of high peak current and low emittance. These characteristics are made possible through the utilization of intense field acceleration in a radio-frequency (RF) photoinjector source. However, despite the current utilization of high fields, certain limitations exist on the achievable peak current for high brightness operation, typically in the range of tens of Amperes.
To overcome this limitation, a hybrid structure combining standing wave and traveling wave components proves to be effective [1]. The standing wave section facilitates high-field acceleration from the photocathode, while the traveling wave portion induces strong velocity bunching. This remarkably compact injector system offers the additional advantage of simplifying the distribution of RF power by eliminating the need for the RF circulator. We explore the application of this device in a compact 4.5 MeV electron source for further acceleration up to 100 MeV, enabling both inverse Compton scattering and free-electron laser radiation sources with distinctive and appealing properties.
Within the scope of this research, we undertake the commissioning of the high-field hybrid photoinjector electron source operating in a C-band frequency. Overview of the Hybrid photoinjector and its design features are revealed in this work. Main electron beam parameters such as energy gain and spread, bunch length, charge yield, and transverse emittance were measured in order to justify the photoinjector’s optimal operational parameters. Reported in this work commissioning results will substantiate the foundation for further harnessing hard X-ray from inverse Compton scattering of the IR laser on the electron beam.
[1] L. Faillace, et. al, “High field hybrid photoinjector electron source for advanced light source applications”, Phys. Rev. Accel. Beams, 25, 063401 (2022)
