A tune measurement system for low current and energy ramping operation of a booster synchrotron

Abstract

A betatron tune measurement system is one of the most important diagnostic tools for any circular accelerator. For the commissioning of a booster synchrotron newly developed for top-off injection into the Duke storage ring, a versatile tune measurement system employing a network analyzer, a short stripline kicker, a space filter and a photomultiplier tube has been developed to allow tune measurements over a wide range of beam energies from 0.24 to 1.2 GeV, and for low current measurements at a few micro-amperes. The signal from the highly sensitive optical detection system is also used for fast tune measurements with a realtime oscilloscope. This technique is being developed for live tune monitoring during booster energy ramping.

A betatron tune measurement system based on bunch-by-bunch transverse feedback at the Duke storage ring

“…The basic approach to measure the betatron tune is to excite the electron beam and measure its response. At the Duke FEL lab, the tune measurement systems developed for both the storage ring and the booster synchrotron employ a network analyzer and an optical detector [4,5]. This kind of optical tune measurement system works in the following way: a network analyzer generates an RF drive signal which is amplified and sent to a diagnostic stripline to excite the electron beam; the beam motion is detected using synchrotron radiation from a dipole magnet; and finally, the detected beam signal is compared with the drive signal to determine the betatron tunes.…”