Description
Adiabatic capture of a coasting beam can be used to minimise the emittance of the resulting bunched beam – for example to capture the injected beam at the start of the acceleration cycle. In some cases, the voltage follows the so-called iso-adiabatic voltage law in order maintain the same adiabaticity throughout capture. Here we show that a linear evolution can result in a smaller final emittance than an iso-adiabatic scheme. This is shown by tracking a distribution through various capture schemes, taking as our example capture at injection in the FETS-FFA proton ring. We include preliminary results on the effects of longitudinal space charge which can be significant in this ring.
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Primary author
Dr
David Kelliher
(Science and Technology Facilities Council)
Co-authors
Alan Letchford
(Science and Technology Facilities Council)
Carl Jolly
(Science and Technology Facilities Council)
Dr
Chris Rogers
(STFC/ISIS)
Christopher Prior
(Science and Technology Facilities Council)
Jean-Baptiste Lagrange
(Science and Technology Facilities Council)
Dr
Shinji Machida
(Science and Technology Facilities Council)
