11/05/06GDR-Neutrino à Orsay (LAL)1 GDR-Neutrino (10-11 mai 2006) L. Mosca (CEA-Saclay) The MEMPHYS project (Laboratory excavation) MEgaton Mass PHYSics.

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Presentation transcript:

11/05/06GDR-Neutrino à Orsay (LAL)1 GDR-Neutrino (10-11 mai 2006) L. Mosca (CEA-Saclay) The MEMPHYS project (Laboratory excavation) MEgaton Mass PHYSics in a Large International Underground Laboratory in the Fr é jus tunnel -proton decay -supernovae explosion -solar and atmosph é ric neutrinos -neutrino super-beam and beta-beam from CERN

11/05/06GDR-Neutrino à Orsay (LAL)2 Physics Motivations Nucleon Decay Super Novae Neutrinos: burst & relic Solar & Atmospheric Neutrinos Neutrinos from Accelerators Super Beam, Beta Beam –And also: –Dark Matter (WIMP) indirect detection, High energy neutrinos,…

11/05/06GDR-Neutrino à Orsay (LAL)3 The MEMPHYS Project 65m Fréjus CERN 130km 4800mwe Excavation engineering pre-study has been done for 5 shafts Water Cerenkov modules at Fréjus CERN to Fréjus Neutrino Super-beam and Beta-beam

11/05/06GDR-Neutrino à Orsay (LAL)4

11/05/06GDR-Neutrino à Orsay (LAL)5 « Convergence » measurements along the Fréjus road tunnel

11/05/06GDR-Neutrino à Orsay (LAL)6 A Very Large Laboratory In the middle of the Fréjus tunnel at a depth of4800 m.w.e a preliminary investigation shows the feasibility to excavate up to five shafts of about 250,000 m 3 each

11/05/06GDR-Neutrino à Orsay (LAL)7 Main results of the Preliminary Study 1) the best site (rock quality) is found in the middle of the mountain, at a depth of 4800 mwe : a really good chance ! 2) of the two considered shapes : “tunnel” and “shaft”, the “shaft (= well) shape” is strongly preferred 3) Cylindrical shafts are feasible up to : a diameter  = 65 m and a full height h = 80 m (≈ m 3 ) 4) with “egg shape” or “intermediate shape” the volume of the shafts could be still increased 5) The estimated cost is ≈ 80 M€ X Nb of shafts

11/05/06GDR-Neutrino à Orsay (LAL)8 Exemple of “egg shape” simulation, constrained by the rock parameter measurements made during the present tunnel and laboratory excavation. The main feasibility criterium is that the significantly perturbated region around the cavity should not exceed a thickness of about 10 m

11/05/06GDR-Neutrino à Orsay (LAL)9

11/05/06GDR-Neutrino à Orsay (LAL)10 Two examples of scenario for Water Cerenkov detectors a) 3 shafts of m 3 each, with a fiducial mass of 450 Ktons (“UNO-like” scenario) b) 4 shafts of m 3 each, with a fiducial mass of 600 Ktons _____________________________________________________ -> In both scenarios one additional shaft would be necessary for a Liquid Argon detector of about 100 ktons total mass

11/05/06GDR-Neutrino à Orsay (LAL)11 A MegaTon scale Detector 3 to 4 Water Cerenkov modules ( = 20 x Super K ≈ 500kT fiducial mass) equipped with a large number of Photodetectors (eg. 250,000 PMTs 12”) a very well proved and robust technique which provided already remarkable physical results mainly in Nucleon Decay and Neutrino Physics and Astrophysics

11/05/06GDR-Neutrino à Orsay (LAL)12 Very intense 300÷400 MeV Neutrino Beams from CERN Super Beam based on a 4MW Proton Driver (eg. SPL) :   and   from pion decay Beta Beam (possibly in connection with the EURISOL project) : e  and  e from heavy ions decay

11/05/06GDR-Neutrino à Orsay (LAL)13 SUPERBEAM BETABEAM  → e e →   Superbeam + beta beam together 2 ways of testing CP, T and CPT : redundancy and check of systematics 2 beams 1 detector 2yrs 8yrs 5yrs pure4 flavours + K    

11/05/06GDR-Neutrino à Orsay (LAL)14 A possible schedule for a European Lab. at Frejus Year Safety tunnel Excavation Lab cavity Excavation P.S Study detector PM R&DPMT production Det.preparation InstallationOutside lab. Non-acc.physics P-decay, SN Superbeam Construction Superbeam betabeam Beta beam Construction decision for cavity digging decision for SPL construction decision for EURISOL site

11/05/06GDR-Neutrino à Orsay (LAL)15 La “saga” du tunnel routier de sécurité du Fréjus : diamètre du tunnel date partie Française partie Italienne mars (zero) m 9.50 m décembre m juin m 2 juillet 2004 : création d’un groupe de travail à ce sujet par les deux ministres de l’équipement/transports : Français (Gilles de Robien) e Italien (Pietro Lunardi). Cette Commission devait rendre son rapport pour le 31 Octobre 2004 septembre m 8.30 m mars m (Comité de Sécurité Franco-Italien) 21 avril mètres “utiles” (Commission Inter-Gouvernementale Franco-Italienne)