Author: Porcellato, A.M.
Paper Title Page
PO09 Progress on the RFQ Beam Cooler Design for SPES Project 68
  • M.M. Maggiore, F. Chiurlotto, M. Comunian, A. Dainelli, M. De Lazzari, A. Galatà, A. Minarello, A.M. Porcellato, S. Stark
    INFN/LNL, Legnaro (PD), Italy
  The SPES project is the new Radioactive Ion Beam facility under construction at Laboratori Nazionali of Legnaro, Italy. In this framework in order to improve the beam quality in terms of transversa emittance and energy spread, a study of a new RFQ beam cooler device is in progress. The electromagnetic design of the RFQ section and the electrostatic layout of the injection and extraction regions have been done. The study about the beam dynamic is going on by means of dedicated codes which allow to take into account the interaction of the ions with the buffer gas needed to cool the beams. The preliminary design of the device is carrying on at LNL since 2011 and the feasibility study is funded by V committee of INFN in the framework of REGATA experiment. Both beam dynamics study and the electromagnetic design are presented in this work.  
PO10 Performance of ALPI New Medium Beta Resonators 73
  • A.M. Porcellato, F. Chiurlotto, M. De Lazzari, A. Palmieri, V. Palmieri, S. Stark, F. Stivanello
    INFN/LNL, Legnaro (PD), Italy
  All the Nb sputtered medium beta cavities installed up to the last year in ALPI were produced by upgrading of old previously Pb plated substrates. For the first time this year we had the opportunity to test on line four 160 MHz, β=0.11 QWRs which were designed and built in order to be Nb sputtered. These resonators were sputtered in between 2007 and 2008 and they were tested at low fields (up to 3 MV/m) just after their production when they showed Q-zero values exceeding 1xE9. They were then stored for about three years in plastic bags and installed in ALPI only this year. The on line tests that we performed after installation showed Q-zero values reduced of about a factor five with respect to the ones measured in laboratory. It is the first time we could pick out a Q deterioration caused by storage in air. So far we have not recognized any Q–degradation both when the sputtered cavities were maintained in vacuum for many years and also when they were open to air for a few weeks for cryostat maintenance. In such a case, as it happened in the maintenance of cryostat CR19 housing high beta resonators, we could instead find some improvements in the Q-curves.  
TUA02 A Cost-Effective Energy Upgrade of the ALPI Linac at INFN-Legnaro 106
  • G. Bisoffi, M. Comunian, A. Facco, A. Galatà, P. Modanese, R. Pengo, A. Pisent, A.M. Porcellato, S. Stark
    INFN/LNL, Legnaro (PD), Italy
  • B.B. Chalykh
    ITEP, Moscow, Russia
  The ALPI SC linac at INFN-LNL is being constantly upgraded in terms of maximum beam energy (Ef) and current, made available for experiments. Presently, a liquid-N cooling scheme is being applied to the RF power couplers of the 16 full Nb resonators, to keep them locked at 5 MV/m, vs. present 3 MV/m. A further upgrade of the 44 “medium beta section” cavities, changing the cavity Cu substrates, was prototyped and is reported at this conference: however it is not fully funded yet and is extremely time-consuming. A cost-effective Ef upgrade is proposed here: to move 2 SC buncher cryostats, which house a single working SC QWR but were designed for 4, at the end of ALPI, equipping them with 4 Nb/Cu QWRs each (new bunchers would either be NC QWRs or a single SC cavity cryostat). The contribution of these cryostats to Ef would be extremely effective: e.g. a Ef~10 MeV/A (Ibeam≥ 1 pnA) Pb beam, a very attractive tool for the Nuclear Physics community, is achievable. A being performed upgrade of ALPI cryoplant, expected to increase the refrigeration capability by ~25%, makes this change possible today. Details of this solutions, as well as its limits, will be presented and discussed  
slides icon Slides TUA02 [3.722 MB]