| Paper |
Title |
Page |
| TUPKF022 |
Constructionand Testing of the Beta=0.31, 352 MHz Superconducting Half-wave Resonator for the SPES Project
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1012 |
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- A. Facco, W. Lu, F. Scarpa
INFN/LNL, Legnaro, Padova
- E. Chiaveri, R. Losito
CERN, Geneva
- V. Zviagintsev
TRIUMF, Vancouver
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The interest in low- and medium- beta superconducting cavities is presently focused to future high intensity proton, deuteron and heavy ion linacs. A particular application is acceleration of cw and pulsed beams of variable q/A, which requires cavities with a small number of gaps and excellent mechanical stability. We have designed and constructed a 2 gap, 352 MHz SC half wave cavity aiming to similar characteristics and fitting the requirements of the intermediate-beta section of the LNL-SPES driver. The status of the project and the first test results will be presented.
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| TUPKF023 |
Construction of a 161 MHz, beta=0.16 Superconducting QWR with Steering Correction for RIA
|
1015 |
| |
- A. Facco, W. Lu, F. Scarpa
INFN/LNL, Legnaro, Padova
- E. Chiaveri, R. Losito
CERN, Geneva
- T.L. Grimm, W. Hartung, F. Marti, R.C. York
NSCL, East Lansing, Michigan
- V. Zviagintsev
TRIUMF, Vancouver
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We have built a 161 MHz, b=0.16 superconducting Quarter Wave Resonator with steering correction for the low beta section of RIA. This bulk niobium, double wall cavity, compatible with both separate vacuum between beam line and cryostats or unified one, was designed in collaboration between MSU-NSCL and LNL. The design is suitable for extension to other frequencies, e.g. to obtain the 80 MHz, beta=0.085 cavity required in RIA. The shaped drift tube allows correction of the residual QWR steering that can cause emittance growth especially in light ions; this could make this resonator a good alternative to Half-Wave resonators in high intensity proton-deuteron linacs, like the SPES injector project at LNL. First test results will be presented.
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| WEPLT101 |
On-line Mechanical Instabilities Measurements and Tuner Development in SC Low-beta Resonators
|
2083 |
| |
- A. Facco, E. Bissiato, S. Canella, D. Carlucci, M. Lollo, F. Scarpa, D. Zenere
INFN/LNL, Legnaro, Padova
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The use of high-Q and small rf bandwidth superconducting quarter wave resonators made of bulk niobium put severe requirements to the helium bath pressure stability to avoid cavity detuning. This is not always possible, and cavity detuning caused by slow pressure changes must be precisely followed by the cavity tuner. The LNL philosophy is based on mechanical damping of cavity vibrations and mechanical tuning in feedback for slow frequency compensation. The old-fashioned tuners installed in the ALPI linac had significant performance limitations. To replace them, we have designed, constructed and tested a new tuner which integrates the LNL system and control with the TRIUMF, backlash-free tuner leverage design. The new tuner is designed to compensate pressure changes up to 100 mbar/minute with a precision of 0.5 Hz, and it will be installed in the ALPI resonators. An upgraded prototype for future applications includes a piezoelectric actuator for fast tuning. Tuner characteristics and first test results will be presented. This system is extendable to other low-beta cavity types like superconducting rfqs.
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