Ph.D. (Doctor of Philosophy)
Department of Physics
High brightness electron beams are an essential component that drives current and future accelerators and accelerator-based light sources including Free-Electron lasers (FELs), electron cooling experiments, and compact ultrafast electron probe setups (e.g. ultrafast electron diffraction). In FEL, the possible use of a superconducting radiofrequency (SRF) electron gun to support the generation of high-repetition-rate bright-beam can produce copious amounts of radiation over a broad range of the electromagnetic spectrum which can be used in several scientific experiments while in electron probes, the use of SRF gun can enable the generation of high brightness electron beams at high repetition rates, e.g., necessary to obtain diffraction patterns with simplified setups that can be operated in small laboratories.
In this work, we discuss the generation of electron beams with high average current and high brightness electron beams. The former is achieved via the quantum mechanical tunneling of electrons in Field Emission (FE) while the latter is achieved via laser-induced phot-emitted electrons.
We present the design and test of a DC electron gun capable of testing FE cathodes at NIU. We show the design of a footprint accelerator based on SRF technology coupled with state-of-the-art conduction cooling. We present thermal, electromagnetic, and beam-dynamics simulations that support the feasibility of the design. Furthermore, we explore the optimization of the proposed design via FE and photoemission electron sources with possible industrial and scientific applications. We also show the recent result of a proof-of-principle experiment that confirmed some of the expected properties of the design. Finally, we discuss the result of optimizing an SRF photoinjector with a quarter-wave resonator (QWR) cavity to generate high-repetition-rate bunches with superior brightness that can be used in future FELs.
Mohsen, Osama, "Design and Optimization of Superconducting Radio-Frequency Electron Sources" (2021). Graduate Research Theses & Dissertations. 7464.
Northern Illinois University
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