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Title |
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| TUPOR023 |
Investigation of Trapped Resonant Modes in Insertion Devices at the Australian Synchrotron |
1710 |
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- R.T. Dowd, M.P. Atkinson, M.J. Boland, G. LeBlanc, Y.E. Tan
SLSA, Clayton, Australia
- D. Teytelman
Dimtel, San Jose, USA
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The Australian Synchrotron light Source has 3 variable gap in-vacuum undulators (IVU) in the storage ring. Since installation, these devices have been the source of strong beam instabilities. These instabilities seem to behave as trapped resonant modes of very high Q and high frequency, although a definite source has not been identified. The presence of these instabilities has necessitated operating at unusually high chromaticity for much of the light source's operations. More recently transverse feedback has been able to control the instabilities and recent developments in diagnostics have allowed some investigation of the frequency and mode response of these resonances. The results of this investigation will be presented in this paper.
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| TUPOW055 |
Coronagraph Measurements on the Australian Synchrotron Storage Ring Optical Diagnostic Beamline |
1895 |
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- M.J. Boland, Y.E. Tan
SLSA, Clayton, Australia
- T.M. Mitsuhashi
KEK, Ibaraki, Japan
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A coronagraph was constructed on the Optical Diagnostic Beamline at the Australian Synchrotron to observe the tails of the stored beam and the injected beam on the first few turns. Some results are presented with special emphasis on the limitation of the dynamic range due to the quality of the synchrotron light extraction mirror.
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