Facco A.

Paper	Title	Page
MO404	ALPI QWR and S-RFQ Operating Experience	55
	G. Bisoffi, G. Bassato, S. Canella, D. Carlucci, A. Facco, P. Modanese, A. Pisent, A. M. Porcellato, P. A. Posocco INFN
	The operation of ALPI at INFN-LNL allowed acquiring more than a decade of experience on the operational issues of quarter wave resonators (QWRs), built with the three technologies of Pb/Cu electroplating , Nb/Cu sputtering and full Nb. More recently, with the commissioning of the superconducting injector PIAVE, a 2-year long operational experience with superconducting RFQs was acquired. The paper reports off and on line performances of all INFN-LNL superconducting resonators and the most relevant issues in their setup for reliable accelerator operation. Future perspectives, opened by the experimental campaign with the EU detector AGATA and by the proposed use of ALPI as the radioactive nuclei beam (RNB) accelerator of the SPES facility, are discussed.
	Slides(PDF)
TUP67	Niobium Quarter-Wave Resonator Development for a Heavy Ion Re-accelerator	296
	W. Hartung, J. Bierwagen, S. Bricker, C. Compton, T. Grimm, M. Johnson, F. Marti, J. Popielarski, L. Saxton, R. C. York Michigan State University A. Facco INFN-LNL E. Zaplatin FZ Juelich
	A superconducting linac is being designed for reacceleration of exotic ions produced by the Coupled Cyclotron Facility at Michigan State University (MSU). The re-accelerator beam line will include a cyclotron gas stopper, a charge breeder, a normal conducting radio-frequency quadrupole, and two types of superconducting quarterwave resonators (QWRs) for re-acceleration to energies of up to 3 MeV per nucleon, with the option of additional acceleration to 12 MeV per nucleon as a future upgrade. Both QWR types are based on existing cavities that are presently used at INFN-Legnaro. The second QWR (optimum beta = 0.085, 80.5 MHz) was previously designed and prototyped as a collaborative effort between Legnaro and MSU. The first QWR (optimum beta = 0.041, 80.5 MHz) is very similar to the corresponding QWR in use at Legnaro, but with a larger beam aperture. Separation between the cavity vacuum and the cryostat insulation vacuum is also implemented to reduce the risk of particulate contamination. Structural analysis of the QWRs is being done in collaboration with FZ Juelich. The beta = 0.041 QWR design and prototyping effort is discussed in this paper.
WEP08	Upgrade of the low-beta section of the PIAVE-ALPI linac at LNL	450
	D. Zenere, A. Facco, F. Scarpa INFN-LNL
	The superconducting linac PIAVE-ALPI includes a low-beta section made of 20 bulk niobium quarter wave resonators, working at 80 MHz, with beta=0.047 and 0.055. Originally designed for operation at 3 MV/m with 7 W RF power, their high Q allows significantly higher gradient, limited at present by the existing RF system capabilities. An upgrade program has started at LNL that includes the construction of 4 additional cavities, the adoption of 1 kW RF power amplifiers and modifications of the cryostats that will allow for cooling of the RF couplers. The final goal is to increase the voltage gain in the low-beta section from the present value of ~10 to above 20 MeV/q, allowing efficient acceleration of heavy ions with mass number around 200.