A hydrogen-induced infrared absorption band located around 1835.4 cm-' is observed in protonimplanted GaAs single crystal at 4.2 K and identified as a hydrogen localized vibrational mode (LVM). The dependence of absorption intensity, linewidth, and frequency of the hydrogen LVM on temperature is presented for the first time. Both, the linewidth and frequency shift due to temperature variation are much larger than those of the hydrogen-
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.
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