Modane underground laboratory (Fréjus)

Transcription

1 Modane underground laboratory (Fréjus) Present and Future IDM 2006, Rhodes F. Piquemal (CENBG, CNRS-IN2P3, U. Bordeaux I) Presented by G. Gerbier (CEA-Dapnia Saclay)

2 Modane Underground Laboratory (Fréjus) FRANCE France Fréjus (2934 m) Italy ITALY 0 km 6.5 km Fréjus highway tunnel 12.9 km 1750 m rock thickness 4800 mwe 4 muons/m 2 /jour fast neutrons/cm 2 /s from rock/concrete radioactivity Rn concentration 5-10 Bq/m 3

3 Physics in LSM today -Dark matter search (EDELWEISS) - Neutrino physics: Neutrinoless double beta decay search (NEMO 3, TGV) - Super Heavy elements search (SHIN) - Gamma Spectroscopie with a park of 13 Ge detectors (radiopure material selection, environmental measurement, applications) - Developpement of ultra low background Ge detectors

4 Laboratory overview Car parking «Anti-radon» factory Lab entrance Ge room EDELWEISS II NEMO 3

5 Radon free air purification system Radon-free SuperKamiokande-like Air Factory kg -50 o C A( 222 Rn) in the LSM ~ 5-10 Bq/m 3 Fresh air (taken at 3000 m) Lab volume renewed 2 times/h Production of radon free air: 150 m 3 /h A( 222 Rn) ~ 0.1 Bq/m 3 Radon free air send around NEMO 3, EDELWEISS and some of the Ge detectors

6 NEMO 3: Neutrinoless Double beta decay search (A,Z) (A,Z+2) + 2 e - nature of neutrino dirac (ν ν) or Majorana (ν=ν) Mass scale of the neutrinos Detector is running since 2003 β 7 kg 100 Mo β Tracko-calo detector T 1/2 (ββ0ν) > y (90% CL) Expected sensitivity in 2009: T 1/2 (ββ0ν) > y (90% CL)

7 Edelweiss II Dark matter search Validation stage with 9 detectors in Progress Installation of 28 detector in October 2006 Final stage 100 detectors Expected sensitivity: picobarn

8 Germanium Detectors 2 rooms dedicated to the Gamma spectroscopie: 13 detectors -Materials selection - Environmental measurements - Applications: water control wine datation Age of lobster.. New low background planar detector founded by ILIAS, developed by LSM, CENBG and Canberra in 2007

9 Futur of the LSM (1) 13 km ( m) Safety gallery New lab Roadway Tunnel 70mx 70m x 250 m France LSM Italy Megaton 2 projects Future Lab. -New lab 30,000 50,000 m 3 for Double beta decay and dark matter searches (SuperNEMO, EURECA) Present road Tunnel at Fréjus (grey) And future Tunnel (black) for safety with 34 bypasses (shelters) connecting the two Tunnels -Excavation for Megaton detector (MEMPHYS) Proton decay search, Neutrino physics, supernovae

10 Future of the laboratory (1) Project of extension 30,000-50,000 m 3 Safety gallery is an opportunity to dig a new cavity New lab? Pre-studies are in progress Safety gallery LSM New lab? Roadway tunnel Cavity would be large enough for next generation of double beta decay (SuperNEMO) or dark matter experiment (EURECA)

11 The MEMPHYS Project CERN 130km Fréjus Water Cerenkov modules at Fréjus CERN to Fréjus Neutrino Super-beam and Beta-beam 4800mwe Excavation engineering pre-study has been done for 5 shafts L. Mosca BENE meeting Nov 2005

12 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,

13 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

14 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

15 Very intense MeV Neutrino Beams from CERN 6 He 18 Ne Super Beam based on a 4MW Proton Driver (eg. SPL) : ν μ and ν μ from pion decay Beta Beam (possibly in connection with the EURISOL project) ν e and ν e from heavy ions decay (Focused ν beam, energy very well Known, pure flavor composition) Neutrino flux of β-beam (γ=100) And CERN-SPL, Super-beam, 3.5 GeV at 130 km) (HEP-ph/ v1)

16 Main Physics potential non accelerator-based physics Nucleon decay - up to ~10 35 yrs (p e + π 0 ) - few yrs (p ν K + ) with a detection threshold below 6MeV Neutrino bursts from Super-Novae explosion 150,000 events from SN at 10kpc 50 events from Andromeda Relic Neutrinos from past Super-Novae explosions 250 events/10y/0.5mt (with pure water) 2500 events/10y/0.5mt (with Gd loaded water)

17 Superbeam + beta beam together 2yrs SUPERBEAM 4 ν flavours + K ν μ ν e 2 beams 1 detector BETABEAM ν e ν μ pure 5yrs π + /π 8yrs ν μ ν e ν e ν μ 5yrs 2 ways of testing CP, T and CPT : redundancy and check of systematics

18 Main Physics potential (continued) accelerator-based physics (HEP-ph/ v1) θ 13 sensitivity as a function of δ cp (Δm 13 = ) δ cp dicovery potential at 3 σ

19 A possible schedule for a European Lab. at Frejus Year Safety tunnel Excavation Lab cavity P.S Study Excavation detector PM R&D PMT production Det.preparation Non-acc.physics Outside lab. Installation P-decay, SN Superbeam Construction Superbeam betabeam Construction Beta beam decision for cavity digging decision for SPL construction decision for EURISOL site

20 Outlook - Fréjus has various avantages: right distance from CERN, easy access by train and car, horizontal access, possibility to dig large cavities,. - LSM participate to the ILIAS network of underground Lab - (with Gran Sasso, Canfranc, Boulby, Pyhasalmi) -Cooperation agreement with JINR Dubna -Activities in Dark matter, neutrino physics, Gamma spectroscopy and applications -2 projects in the futur: - 50,000 m 3 extension (dark matter, double beta) - Huge cavern for Megaton detector (proton decay, neutrino) Studies in progress (cavity shape, cost, ) Project of new office in Modane in 2008