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Persistent URL http://purl.org/net/epubs/work/12167600
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Record Id 12167600
Title Beam dynamics observations of slow integer tune crossing in EMMA
Abstract In the nominal EMMA design, particles are accelerated rapidly in the serpentine channel between RF buckets. Many integer tunes are crossed in less than a turn in this regime without significant amplitude growth. Slower acceleration inside an RF bucket in EMMA allowed the exploration of slower integer tune crossing speeds. The effect on the coher- ent oscillation amplitude A was observed and the charge loss at integer tune crossings indicated betatron amplitude growth to particles in the bunch. Aided by simulations in Zgoubi, it was observed that tune spread and natural chromaticity in EMMA drove transverse decoherence which was sped up by longitudinal decoherence from synchrotron motion; this made transverse betatron amplitude growth difficult to observe using the BPMs in EMMA and meant that A agreed more closely with the standard deviation of the closed orbit distortion.
Organisation ASTeC , ASTeC-AP , ASTeC-IB , CI , STFC
Keywords ASTeC 2014-2015
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Language English (EN)
Type Details URI(s) Local file(s) Year
Paper In Conference Proceedings In 5th International Particle Accelerator Conference (IPAC14), Dresden, Germany, 15-20 Jun 2014, CI Preprints (2014). http://jacow.org/…/papers/thpro084.pdf 2014