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| WEOCG01 |
Orbit Feedback Trickery at the NSLS VUV Ring
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1931 |
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- B. Podobedov
BNL, Upton, Long Island, New York
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A couple of NSLS user groups has recently requested an unusual modification to the way the VUV ring orbit is controlled and stabilized. Rather than keeping the orbit as stable as possible they require a large (many transverse beam sizes) periodic orbit oscillation at the source points of their beamlines. During regular machine operations this has to co-exist with stable orbit throughout the rest of the ring. Achieving good orbit stability under these constraints presents an interesting control problem. Making use of control theory tools and Matlab / Simulink modeling we have explored various algorithms to allow for these new requirements. We then extended our digital orbit feedback system to incorporate these algorithms. In this paper we present commissioning results as well as comparison to the simulations.
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Slides
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| WEOCG02 |
Post-mortem Diagnostic for the Taiwan Light Source
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1932 |
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- K. H. Hu, J. Chen, P. C. Chiu, K. T. Hsu, S. Y. Hsu, C. H. Kuo, D. Lee, C.-J. Wang, C. Y. Wu
NSRRC, Hsinchu
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Analyzing the reasons of various trip events is essential to improve reliability of a synchrotron light source. To identify the causes of trip at Taiwan Light Source (TLS), various diagnostics tool were employed. These diagnostic tools can capture beam trip, interlock signals of superconducting RF system, waveform of the injection kickers, quench and interlock signals of the superconducting insertion device, and instability signals of the stored beam for post-mortem analysis. These diagnostics can be routine monitor signal and record beam trip event. Features of trip diagnostic tools are available now. System configuration experiences will be summarized in this report.
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Slides
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| WEOCG03 |
RF Reference Signal Distribution System for FAIR
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1935 |
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- M. Bousonville
GSI, Darmstadt
- P. Meissner
TU Darmstadt, Darmstadt
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For the synchronisation of RF systems in the FAIR (Facility for Antiproton and Ion Research) synchrotrons and storage rings, an RF Reference Signal Distribution System is being developed. The FAIR RF cavities need signals with different phases and frequencies. Furthermore, frequency ramps with RF frequency ratios of up to 7 have to be realized in all rings. To enable this functionality, the distribution system provides two different clock signals to several locations within the facility that will be up to 1 km apart. By means of these clock signals, frequency generators can be synchronised that generate the RF signals needed for the cavities. For the transmission of the clock signals, an optical network based on the DWDM method (Dense Wavelength Division Multiplex) will be used. The delay will permanently be measured and by means of the delay data, a clock regenerator produces a phase synchronous and stable reference signal at the end of each transmission line. A delay measurement accuracy of better than 100 fs has been achieved. The presentation focuses on the design of the system as well as the performance of the prototype.
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Slides
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