The RHIC Tune Measurement System
نویسندگان
چکیده
Each of the four fractional betatron tunes of RHIC (two planes, two rings) is measured with a transverse beam kicker and dedicated beam position monitor (BPM). A 15kV pulse is generated by a fast FET switch, passed through a stripline kicker, attenuated, and returned to the instrumentation control room (ICR) for monitoring. When pulsed at 3kV, the four-meter long kicker gives a gold beam at injection (γ=12.6) an angular kick of 11μrad resulting in a betatron amplitude of 0.8mm at the BPM (σbeam=4.3mm). A single bunch is kicked a few times and then measured for several hundred turns. A fast Fourier transform (FFT) of the position data gives the tune.
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