Abstract
The NSLS booster is a 7 to 750 MeV synchrotron with a 0.7 Hz repetition rate. The betatron tunes can change during acceleration by as much as 0.1 units, causing beam loss as they cross resonance lines. Precise measurements with a conventional swept spectrum analyzer have always been difficult because of the rapid variation of tune as the magnets are ramped. We are now using a system based on a Tektronix 3052 Digital Signal Processing System that can obtain an effectively continuous measurement of both the horizontal and vertical tunes during a single acceleration cycle. Betatron oscillations are stimulated for the measurements by applying broadband noise to the beam through stripline electrodes. We will describe the instrumentation, our measurements of tune as a function of time during the acceleration cycle, and the resulting improvements to the booster operation.
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