| Paper |
Title |
Page |
| TUPKF020 |
Numerical Investigation on the ELETTRA 500 MHz Power Coupler
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1006 |
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- C. Pasotti, P. Craievich, A. Fabris, G. Penco, M. Svandrlik
ELETTRA, Basovizza, Trieste
- B. B. Baricevic
DEEI, Trieste
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Due to the high input power required to feed a resonant cavity, the RF input coupler is a critical component for the reliability of an RF system. The 500 MHz RF input coupler for the ELETTRA cavities was specified for 150 kW input power. It is important to investigate the performance limits of the coupler in view of increasing RF power requirements. The coupler's maximum peak field and dissipation versus the input power have been studied by means of the numerical simulator HFSS. Possible improvements to the existing design have been investigated. The optimization has to take into consideration the following requirements: convenient power transmission efficiency, RF matching, suitable coupling coefficient, negligible perturbation on cavity voltage, moderate operating temperature and stress.
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| TUPKF021 |
First Year of Operation of SUPER-3HC at ELETTRA
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1009 |
| |
- G. Penco, P. Craievich, A. Fabris, C. Pasotti, M. Svandrlik
ELETTRA, Basovizza, Trieste
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Since July 2003 a superconducting third harmonic cavity has been in routine operation at ELETTRA. When the cavity is activated the stored electron bunches are lengthened by about a factor of three. The related longitudinal Landau damping has allowed first time operation at 320 mA, 2.0 GeV with a beam completely free of longitudinal coupled bunch instabilities. With the cavity active the lifetime at 320 mA, 2.0 GeV is three times the theoretical value for nominal bunch length. The increase in beam stability and lifetime contributed significantly to enhance the brightness and the integrated flux of the source. We will further discuss the operating experience with the superconducting cavity and the cryogenic system, analyzing the impact of the new system on machine operation and uptime. Finally we will also report on the characterization of the cavity performance for different filling patterns of the storage ring and relate the results to preliminary beam-cavity interaction studies.
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