| Paper |
Title |
Page |
| MOPKF055 |
A Study of CSR Induced Microbunching Using Numerical Simulations
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434 |
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- M.A. Bowler, H.L. Owen
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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Microbunching due to Coherent Synchrotron Radiation (CSR) has been predicted for high density bunches and has been 'observed' using numerical simulations by the code ELEGANT of M. Borland, which includes a 1D model of CSR. However, there is currently a debate as to whether this micro-bunching is a real physical effect or is a numerical artefact, possibly introduced by having to use macro-particles to model the electrons. In particular, the amplitude of the micro-bunching diminishes as the number of macroparticles increases, but the question remains open as to whether the amplitude converges to zero or a finite value. The micro-bunching produced by ELEGANT is being studied as a function of the numerical parameters of the code and also as a function of the range of bunch parameters and bending magnet strengths of relevance to the 180 degree bending arcs required for the proposed 4GLS at Daresbury Laboratory. Calculations with up to 2 million macroparticles have been carried out on a Linux workstation using gaussian bunches of FWHM of 2psec and charge of 1 nC, and show the existence of microbunching at the end of a 180 degree arc containing 5 TBA cells with magnet strengths of 0.5T. Further investigation of this problem is required.
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| MOPKF061 |
Optics Layout for the ERL Prototype at Daresbury Laboratory
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449 |
| |
- B.D. Muratori, H.L. Owen, J.A. Varley
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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The overall optics for the Energy Recovery Linac Prototype (ERLP) at Daresbury Laboratory is summarised. This includes the layout of the injector line, all chicanes used, as well as details of both the outward and return TBA arcs. The tunability in several sections of the machine is examined under different operational modes and starting parameters from the end of the booster to the dump.
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| MOPKF062 |
Choice of Arc Design for the ERL Prototype at Daresbury Laboratory
|
452 |
| |
- H.L. Owen, B.D. Muratori
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
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The choice of arc design for the Energy Recovery Linac Prototype (ERLP) to be built at Daresbury Laboratory is investigated. Both the overall merits and disadvantages of a TBA arc and Bates bend are considered, and space restrictions particular to Daresbury Laboratory given. Some magnet parameters are given together with a summary of the layout of the ERLP.
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