High-resolution betatron tune measurement in a rapid cycling synchrotron

Harada, Hiroyuki; Hayashi, Naoki

no journal, , 

Transverse beam oscillation frequency (betatron tune) is measured by detecting the beam position with detect time of T and analyzing Fourier transform. The tune accuracy depends on frequency resolution of 1/T. In a rapid cycling synchrotron, a beam is quickly accelerated and then revolution frequency is quickly changed. So, detect time of T is limited for tune measurement and then tune accuracy is not improved. We apply a new analyzing method. As the result, tune accuracy is improved from 0.013 to less than 0.001. So, we can control well tune tracking during acceleration and this result is base for high-intensity beam power. In this presentation, we will report the new method and results.