Analytical Study on Beam Steering in Low-β Superconducting Quarter Wave Resonators
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Graphical Abstract
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Abstract
Superconducting(SC) cavities currently used for acceleration of ions in the velocity range from 0.01 c to 0.3 c are based frequently on quarterwave resonators(QWR). Various types of QWR cavities across a frequency extent from 50 to 240 MHz have been constructed or are proposed for numerous applications. A drawback of this kind of cavities is the beam steering caused by transverse magnetic and electric field components, which can creat emittance growth. In this paper, the analytical studies on beam steering in quarter wave resonator of frequency=80.5 and 161 MHz of the SC linac has been done in Institute of Modern Physics, Chinese Academy of Sciences, the calculated results have told us that the correction for beam deflection should be a consideration during the design of the QWR cavity, which generally involves the shaping the inner drift tube.
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