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Title |
Other Keywords |
Page |
| MOPP026 |
A Longitudinal Kicker Cavity for the BESSY II Booster |
cavity, booster, feedback, simulation |
150 |
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- T. Atkinson, M. Dirsat, A.N. Matveenko, A. Schälicke, B. Schriefer, Y. Tamashevich
HZB, Berlin, Germany
- T. Flisgen
FBH, Berlin, Germany
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As part of the global refurbishment of the injector systems at BESSY II, a new longitudinal kicker cavity and suitable feedback will be installed in the booster. Both a flexible bunch charge and spacing is essential for efficient injection. Such a cavity is needed to mitigate the unwanted couple bunch instabilities associated with these elaborate filling patterns and the HOMs of additional accelerating structures. This paper covers the conceptual design, simulation strategy, manufacture and bench tests of the longitudinal kicker cavity before it is installed in the ring.
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Poster MOPP026 [4.756 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP026
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| About • |
paper received ※ 02 September 2019 paper accepted ※ 07 September 2019 issue date ※ 10 November 2019 |
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| MOPP028 |
Longitudinal Bunch-by-Bunch Feedback Systems for SuperKEKB LER |
feedback, operation, timing, cavity |
159 |
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- M. Tobiyama, J.W. Flanagan, T. Kobayashi, S. Terui
KEK, Ibaraki, Japan
- J.D. Fox
Stanford University, Stanford, California, USA
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Longitudinal bunch-by-bunch feedback systems to suppress coupled bunch instabilities with minimum bunch spacing of 2 ns have been constructed in SuperKEKB LER. Through the grow-damp and excite-damp experiments with several filling patterns and the transient-domain analysis of unstable modes, the behaviors of possible impedance sources have been evaluated. The measured performance of the system, together with the performance of the related systems such as slow phase feedback to the reference RF clock are reported.
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Poster MOPP028 [0.519 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP028
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| About • |
paper received ※ 03 September 2019 paper accepted ※ 08 September 2019 issue date ※ 10 November 2019 |
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| MOPP031 |
Optimisation of the ISIS Proton Synchrotron Experimental Damping System |
damping, synchrotron, feedback, betatron |
167 |
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- A. Pertica, D.W. Posthuma de Boer, R.E. Williamson
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
- J. Komppula
CERN, Meyrin, Switzerland
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The ISIS Neutron and Muon Source, located in the UK, consists of a H− linear accelerator, a rapid cycling proton synchrotron and two extraction lines delivering protons onto heavy metal targets. One of the limiting factors for achieving higher intensities in the accelerator is the head-tail instability present in the synchrotron, around 2ms after injection. In order to mitigate this instability, an experimental damping system is being developed for the ISIS synchrotron. Initial tests using a split electrode BPM as a pickup and a ferrite loaded kicker as a damper showed positive results. This paper describes the different developments made to the damping system and planned improvements to optimize its performance for use in normal operations.
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Poster MOPP031 [1.557 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP031
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| About • |
paper received ※ 04 September 2019 paper accepted ※ 09 September 2019 issue date ※ 10 November 2019 |
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