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 amplit...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 coherent oscillation amplitude 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 is observed that tune spread and natural chromaticity in EMMA drove transverse decoherence which is sped up by longitudinal decoherence from synchrotron motion. Amplitude growth from integer tune crossing can be observed, but detailed multi-particle simulations are needed to correctly interpret the observed behaviour.Read More
Publication Year: 2014
Publication Date: 2014-07-01
Language: en
Type: article
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