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- F. Gerigk, G. Bellodi, E. Benedico Mora, Y. Body, F. Caspers, R. Garoby, K. Hanke, C. E. Hill, H. Hori, J. Inigo-Golfin, K. Kahle, T. Kroyer, D. Kuchler, J.-B. Lallement, M. Lindroos, A. M. Lombardi, L. A. Lopez Hernandez, M. Magistris, T. Meinschad, A. Millich, E. Noah, M. M. Paoluzzi, M. Pasini, C. Rossi, J.-P. Royer, M. Sanmarti, E. Zh. Sargsyan, R. Scrivens, M. Silari, T. Steiner, J. Tuckmantel, M. Vretenar
CERN, Geneva
- M. A. Baylac, J.-M. De Conto, E. Froidefond
LPSC, Grenoble
- S. Chel, R. Duperrier, D. Uriot
CEA, Gif-sur-Yvette
- C. Pagani, P. Pierini
INFN/LASA, Segrate (MI)
- V. Palladino
INFN-Napoli, Napoli
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A revision of the physics needs and recent progress in the technology of superconducting (SC) RF cavities have triggered major changes in the design of a SC H- linac at CERN. With 4 - 5 MW beam power, the SPL can be the proton driver for a next generation ISOL-type radio-active beam facility ("EURISOL") and/or supply protons to a neutrino facility (conventional superbeam + beta-beam or neutrino factory). Furthermore the SPL can replace Linac2 and the PS booster, improving significantly the beam performance in terms of brightness, intensity, and reliability for the benefit of all proton users at CERN, including LHC and its luminosity upgrade. Compared with the first conceptual design, the beam energy is almost doubled (3.5 GeV instead of 2.2 GeV) while the length is reduced by 40%. At a repetition rate of 50 Hz, the linac re-uses decommissioned 352.2 MHz RF equipment from LEP in the low-energy part. Beyond 90 MeV the RF frequency is doubled, and from 180 MeV onwards high-gradient SC bulk-niobium cavities accelerate the beam to its final energy of 3.5 GeV. This paper presents the overall design approach, together with the technical progress since the first conceptual design in 2000.
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Linac4 is a new 160 MeV H- linac proposed at CERN to replace the 50 MeV Linac2 as injector to the PS Booster, with the goal of doubling its brightness and intensity. The present design foresees after RFQ and chopping line a sequence of three accelerating structures: a Drift Tube Linac (DTL) from 3 to 40 MeV, a Cell-Coupled DTL (CCDTL) to 90 MeV and a Side Coupled Linac (SCL) up to the final energy. The DTL and CCDTL operate at 352 MHz, while in the SCL the frequency is doubled to 704 MHz. Although the injection in the PS Booster requires only a low duty cycle, the accelerating structures are designed to operate at the high duty cycle required by a possible future extension to a high power linac driver for a neutrino facility. This paper presents the different accelerating structures, underlining the progress in the design of critical resonator elements, like post-couplers in the DTL, coupling slots in the CCDTL and bridge couplers for the SCL. Alternative structures to the SCL are analysed and compared. Prototyping progress for the different structures is reported, including the RF design of a DTL tank prototype and results of low and high power tests on a CCDTL prototype.
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