| Paper |
Title |
Page |
| TUP071 |
Beam-Loading Effects on Phase Scan for the Superconducting Cavities
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418 |
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- D.-O. Jeon, S. Henderson, S.-H. Kim, Y. Zhang
ORNL, Oak Ridge, Tennessee
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When the beam is passing through superconducting cavities, it excites beam induced field in cavities. A systematic study was performed to study the beam loading effects by the nonrelativistic beam for β = 0.81 superconducting cavities of the SNS linac. The analysis indicates that the induced field level is quite close to the estimation and its effect on the phase scan is consistent with the model.
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| TUP083 |
Development of High-Power RF Vector Modulator Employing TEM Ferrite Phase Shifters
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451 |
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- Y. W. Kang, M. S. Champion, S.-H. Kim, M. P. McCarthy, A. V. Vassioutchenko, J. L. Wilson
ORNL, Oak Ridge, Tennessee
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Construction and installation of cavity RF power distribution system in a high power superconducting RF accelerator can have cost savings if a fan-out configuration that feeds many cavities with a single high power klystron is realized. The configuration however requires independent control of RF amplitudes and phases to the cavities to perform properly. A prototype high power RF vector modulator for the control is built and tested. The vector modulator employs a quadrature hybrid and two fast ferrite phase shifters in square coaxial TEM transmission lines. The square coaxial format can provide the power handling capability and thermal stability. RF properties of the design and result of high power system testing of the design are presented.
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| THP081 |
Study on Fault Scenarios of Coaxial Type HOM Couplers in SRF Cavities
|
770 |
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- S.-H. Kim, I. E. Campisi, F. Casagrande, M. S. Champion, M. T. Crofford, D.-O. Jeon, Y. W. Kang, M. P. McCarthy, D. Stout
ORNL, Oak Ridge, Tennessee
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Coaxial type couplers are adopted in many superconducting radio-frequency (SRF) cavities to suppress higher order modes for beam dynamics and cryogenic loads issues. HERA (Hadron-Electron Ring Accelerator) and TTF (Tesla Test Facility) are equipped with this type coupler and showed successful performances. It is, however, under suspicion that a limitation or a fault could be initiated from this type of coupler at certain combinations between cavity operating conditions and engineering designs of the coupler. Some possible scenarios are summarized and also some observations in the SNS (Spallation Neutron Source) SRF cavities are also reported.
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