| Paper |
Title |
Page |
| 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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| THP029 |
Development of an RFQ Input Power Coupling System
|
634 |
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- Y. W. Kang, A. V. Aleksandrov, M. M. Champion, M. S. Champion, M. T. Crofford, P. E. Gibson, T. W. Hardek, P. Ladd, M. P. McCarthy, D. Stout, A. V. Vassioutchenko
ORNL, Oak Ridge, Tennessee
- H. L. Haenichen
TU Darmstadt, Darmstadt
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An RF input coupler system is designed, manufactured, and tested for future upgrade of the coupling system of the RFQ in the SNS linac. The design employs two coaxial loops in vacuum side of two coaxial ceramic windows through coaxial transmission lines that are connected to a magic-T waveguide power splitter for 402.5 MHz operation. The couplers will be used with up to total 800 kW peak power at 8% duty cycle. RF properties of the system and fabricated structure along with vacuum and thermal properties are discussed. Two couplers are joined together through an evacuated bridge waveguide for high power RF processing. Result of the high power conditioning that is performed in the RF test facility of the SNS is presented.
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| THP081 |
Study on Fault Scenarios of Coaxial Type HOM Couplers in SRF Cavities
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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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