A preliminary study of the feasibility of using superconducting quarter-wave resonators for accelerating high intensity proton beams

Abstract

The superconducting (SC) cavities currently used for the acceleration of protons at a low velocity range are based on half-wave resonators. Due to the rising demand on high current, the issue of beam loading and space-charge problems has arisen. Qualities of low cost and high accelerating efficiency are required for SC cavities, which are properly fitted by using SC quarter-wave resonators (QWR). We propose a concept of using QWRs with frequency 162.5 MHz to accelerate high current proton beams. The main factor limiting SC QWRs being applied to high current proton beams is vertical beam steering, which is dominantly caused by the magnetic field on axis. In this paper, we intend to analyze steering and eliminate it to verify the qualification of using QWRs to accelerate high intensity proton beams.

Geometry dependent multipacting of a superconducting quarter-wave resonator at PKU

“…A superconducting QWR of frequency=162.5 MHz and β=0.085 to accelerate high current proton beam has been designed [2]. Its electromagnetic (EM) design and optimization have been completed [3].…”

Electromagnetic design and optimization of a superconducting quarter wave resonator

“…However, numerical calculations suggest that the steering of the particular QWR with frequency 162.5 MHz can be greatly reduced at a wide β range by an applicable method. More details are referred to in the study of the feasibility of using SC QWR for accelerating a high intensity proton beam [9]. The following sections will focus on the electromagnetic design and optimization of the QWR.…”