| Paper |
Title |
Page |
| MOP039 |
The SPL (II) at CERN, a Superconducting 3.5-GeV H- Linac
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127 |
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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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| MOP048 |
Installation of the French High-Intensity Proton Injector at Saclay
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153 |
| |
- P.-Y. Beauvais, R. Duperrier, R. Gobin
CEA, Gif-sur-Yvette
- P. Ausset
IPN, Orsay
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The installation of the French high intensity injector “IPHI” is in progress on the Saclay site. The proton source, RF power system, cooling plant, diagnostics line as well as shielding are now in place. The first sections of the RFQ cavity are installed on their supports. Commissioning is planned during the first half of 2007. At the beginning of 2008, a beam chopper, developed at Cern, will be inserted between the RFQ and the diagnostics line and tested with a proton beam. At the end of 2008, part of IPHI will be moved from Saclay to Cern. New tests, intended for the LINAC4 project, will be carried out using a negative hydrogen beam. This paper describes the fabrication and assembly operations. The future of IPHI at Cern is evoked.
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| TUP081 |
Impact of a RF Frequency Change on the Longitudinal Beam Dynamics
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447 |
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- R. Duperrier, N. Pichoff, D. Uriot
CEA, Gif-sur-Yvette
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A frequency jump in a high-intensity linac could have some impact on the longitudinal beam dynamics and could therefore introduce some filamentation and even some beam loss if the transition is not done properly. This point is especially important when comparisons of cavity performances are performed. We show in this paper two techniques in order to render transparent for the beam such frequency jump. A few examples which show the efficiency of the two techniques are given.
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| TUP086 |
Linac Code Benchmarking for the UNILAC Experiment
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460 |
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- F. Franchi, W. B. Bayer, G. Franchetti, L. Groening, I. Hofmann, A. Orzhekhovskaya, S. Yaramyshev, X. Yin
GSI, Darmstadt
- G. Bellodi, F. Gerigk, A. M. Lombardi, T. Mütze
CERN, Geneva
- G. Clemente, A. C. Sauer, R. Tiede
IAP, Frankfurt-am-Main
- R. Duperrier, D. Uriot
CEA, Gif-sur-Yvette
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In the framework of the European network HIPPI (High Intensity Pulsed Proton Injectors) a linac code comparison and benchmarking program have been promoted. An intermediate goal is to compare different space charge solvers and lattice modelling implemented in each code in preparation of experimental validations from future measurements to be carried out at the UNILAC of GSI. In the last two years a series of different tests and comparisons among several codes (DYNAMION, HALODYN, IMPACT, LORASAR, PARMILA, PATRAN, PATH and TOUTATIS) have been undertaken. The quality of Poisson solvers has been evaluated and a number of code adjustments has been carried out to obtain the best agreement in terms of RMS moments. In this paper we report on the status of this program.
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