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Persistent URL http://purl.org/net/epubs/work/12278301
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Record Id 12278301
Title Image Fields in the Rectangular Vacuum Vessels of the ISIS Synchrotron
Abstract ISIS is the pulsed spallation neutron source based at Rutherford Appleton Laboratory in the UK. Operation is based on a 50 Hz, 800 MeV proton synchrotron, accelerating up to 3E13 protons per pulse, which provides beam to two target stations. Space charge effects contribute significantly to beam loss. Fields from the intense beam interact strongly with their environment. At ISIS the vacuum vessel is rectangular and profiled to follow the shape of the design beam envelope. Past studies have suggested that closed orbit induced image fields may contribute to beam loss under certain conditions. Image fields for parallel plate and rectangular geometries are reviewed, in particular their expansion as power series is determined. A simulation tool has been developed for particle tracking with space charge. The code contains both Fast Fourier Transform and Finite Element Analysis based field solvers, which have been used here to test the range of validity for the power series expansions for centred and off-centred beams. These expansions are then used to determine driving terms for the transverse beam motion. Of particular interest for ISIS is the resonant behaviour of beams with a harmonic closed orbit, which can be compared with the output of beam tracking simulations.
Organisation ISIS , ISIS-ACCEL , STFC
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Language English (EN)
Type Details URI(s) Local file(s) Year
Paper In Conference Proceedings In 54th ICFA Advanced Beam Dynamics Workshop on High-Intensity, High Brightness and High Power Hadron Beams (HB2014), East Lansing, Michigan, USA, 10-14 Nov 2014, (2015): 118-122. http://accelconf.…4/papers/mopab39.pdf 2015
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