PART 2: Initial Beam Dynamics Results of an Integrated and Compact 1.3 GHZ Superconducting Radio Frequency (SRF) Electron Source

Abstract

This paper is the continuation of a technical paper which is called "Detailed Electromagnetic Design of an Integrated and Compact 1.3 GHz Superconducting Radio Frequency (SRF) Electron Source" [1]. In the previous paper, we examined if a promising RF electromagnetic design of the gun and cathode region could be achieved. Further, we examined if this gun region could be fully integrated, in terms of the electromagnetic RF design, with the rest of the accelerator, keeping in mind the overall goal of compactness and reduction of duplicative infrastructure commonly associated with separated function electron guns and structures. While we convinced ourselves thus far that the RF electromagnetic design of our concept is feasible, we also needed to perform particle tracking to assess the beam properties through the entire system, understand and remediate any beam loss. For this step, we examined the cathode region and analyzed the gating process of the thermionic cathode, as losses would most likely be attributed to releasing electrons into the accelerating structure during an unfavorable phase window.

Part 1: Detailed Electromagnetic Design of an Integrated and Compact 1.3 GHZ Superconducting Radio Frequency (SRF) Electron

“…We have used the SUPERFISH (also COMSOL Multiphysics codes and the 3D CST MWS) during design process. The detailed beam dynamics studies of this integrated system are presented in another technical report [15]. In Table 3, we summarize and compare the results obtained from the three different simulation codes for these two different first cell lengths.…”

“…Strong agreement was found in all three cases. We will present in the primary text only the SUPERFISH results since these results have been used as the input for the beam dynamics simulation part [15].…”