TASK 12 - Beta-Beam Aspects

Author(s) :A. Bechtold, M. Benedikt, F. Borgnolutti, E. Bouquerel, L. Bozyk, J. Bruer, A. Chancé, P. Delahaye, A. Fabich, S. Hancock, C. Hansen, E. Jensen, A. Källberg, M. Kirk, A. Lachaize, M. Lindroos, M. Magistris, A. Mueller, J. Payet, H. Podlech, P. Puppel, M. Silari, A. Simonsson, P. Spiller, S. Stadlmann, A. Tkatchenko, S. Trovati, V. Vlachoudis, and E. Wildner

The Beta-Beam project is a concept of large scale facility that aims at providing pure electronic neutrino and antrineutrino beams for the measurement of nu_e --> nu_µ oscillations, offering unprecedented sensitivity for detection of the Theta_13 mixing angle and CP violating phase. In the scenario presented in different publications [1-3], a Beta-Beam facility could be advantageously placed at CERN making use of the PS and SPS for accelerating the beta-decaying, neutrino-emitting beams to a Lorentz gamma of 100. Intense beams of 6He and 18Ne would be produced using the so-called “isotope-separation on line” ISOL method in a facility of the scale of EURISOL. The synergy between the two projects was pointed out in [4]. The task 12 of the EURISOL design study aimed at producing a conceptual design report for the accelerator chain of a EURISOL/CERN-baseline Beta-Beam facility. This document summarizes the achievements made during the time of the study and constitutes the final conceptual report of the beta-beam facility. References [1] B. Autin, M. Benedikt, M. Grieser, S. Hancock, H. Haseroth, A. Jansson, U. Köster, M. Lindroos, S. Russenschuck and F. Wenander, "The acceleration and storage of radioactive ions for a neutrino factory", CERN/PS 2002-078 (OP), Nufact Note 121, J. Phys. G 29 (2003) 1785-1796 and long internal CERN version, PS/OP/Note 2002-181. [2] M.Mezzetto, "Physics reach of the beta-beam", J. Phys. G: Nucl. Part. Phys. 29 (2003) 1771–1776 [3] J. Bouchez, M. Lindroos and M. Mezzetto, 5th International Workshop on Neutrino Factories and Superbeams; NuFact 03. AIP Conference Proceedings, Volume 721, pp. 37-47 (2004). [4] Letter of Intent: FP6 Design Study for a beta-beam facility , September, 2003

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Author(s) :A. Bechtold, M. Benedikt, F. Borgnolutti, E. Bouquerel, L. Bozyk, A. Chancé, P. Delahaye, A. Fabich, S. Hancock, C. Hansen, E. Jensen, A. Kaellberg, M. Kirk, A. Lachaize, M. Lindroos, M. Magistris, A. Mueller, J. Payet, P. Puppel, P. Spiller, A. Tkatchenko, S. Trovati, V. Vlachoudis

The Beta-Beam project is a concept of large scale facility that aims at providing pure electronic neutrino and antrineutrino beams for the measurement of nu_e --> nu_µ oscillations, offering unprecedented sensitivity for detection of the Theta_13 mixing angle and CP violating phase. In the scenario presented in different publications [1-3], a Beta-Beam facility could be advantageously placed at CERN making use of the PS and SPS for accelerating the beta-decaying, neutrino-emitting beams to a Lorentz gamma of 100. Intense beams of 6He and 18Ne would be produced using the so-called “isotope-separation on line” ISOL method in a facility of the scale of EURISOL. The synergy between the two projects was pointed out in [4]. The task 12 of the EURISOL design study aimed at producing a conceptual design report for the accelerator chain of a EURISOL/CERN-baseline Beta-Beam facility. This document summarizes the achievements made during the time of the study and constitutes the final conceptual report of the beta-beam facility. References [1] B. Autin, M. Benedikt, M. Grieser, S. Hancock, H. Haseroth, A. Jansson, U. Köster, M. Lindroos, S. Russenschuck and F. Wenander, "The acceleration and storage of radioactive ions for a neutrino factory", CERN/PS 2002-078 (OP), Nufact Note 121, J. Phys. G 29 (2003) 1785-1796 and long internal CERN version, PS/OP/Note 2002-181. [2] M.Mezzetto, "Physics reach of the beta-beam", J. Phys. G: Nucl. Part. Phys. 29 (2003) 1771–1776 [3] J. Bouchez, M. Lindroos and M. Mezzetto, 5th International Workshop on Neutrino Factories and Superbeams; NuFact 03. AIP Conference Proceedings, Volume 721, pp. 37-47 (2004). [4] Letter of Intent: FP6 Design Study for a beta-beam facility , September, 2003

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Author(s) :A. Chancé, E. Bouquerel, S. Hancock, E. Jensen and J. Payet

The study of the neutrino oscillation between its different flavours needs pure and very intense fluxes of high energy, well collimated neutrinos with a well determined energy spectrum. A dedicated machine seems to be necessary nowadays to reach the required flux. A new concept based on the β-decay of radioactive ions which were accelerated in an accelerator chain was then proposed. After ion production, stripping, bunching and acceleration, the unstable ions are then stored in a racetrack-shaped superconducting decay ring. Finally, the ions are accumulated in the decay ring until being lost. The incoming beam is merged to the stored beam by using a specific RF system, which will be presented here. We propose here to study some aspects of the decay ring, such as its optical properties, its RF system or the management of the losses which occur in the ring (mainly by decay or by collimation).

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Author(s) :Antoine LACHAIZE André TKATCHENKO

During the last two years, several upgrades of the initial baseline scenario were studied with the aim of increasing the average intensity of ion beams in the accelerator chain of the Beta Beam complex. This is the reason why the Rapid Cycling Synchrotron (RCS) specifications were reconsidered many times [1], [2], [3]. General considerations on the optical design were presented at the Beta Beam Task Meetings held at CERN and at Saclay in 2005 [4]. More detailed beam optics studies were performed during the next months. Lattices, RF system parameters, multi-turn injection scheme, fast extraction, closed orbit correction and chromaticity correction systems were proposed for different versions of the RCS [5], [6], [7]. Finally, the RCS specifications have stabilized in November 2006 after the fourth Beta Beam Task Meeting when it was decided to fix the maximum magnetic rigidity of ion beams to 14.47 T.m (3.5 GeV equivalent proton energy) and to adopt a ring physical radius of 40 m in order to facilitate injection in the CERN PS. The present report describes this RCS new design which is based on the results of the previous studies and which fulfils all updated requirements.

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Author(s) :M. Benedikt, S. Hancock

Ion acceleration in the PS and SPS is a routine operation since many years. Different ion types from light ions such as sulphur up to heavy ions such as lead have been accelerated. This document summarizes the results of the study realized within FP6 for the acceleration of the Beta-Beam nuclides 6He and 18Ne.

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