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LAGUNA @ Pyhäsalmi (site review) W. H. Trzaska on behalf of the Finnish LAGUNA team
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125 km 2 of the lake (Pyhä-järvi = Holy-lake) 6000 inhabitants around the shores 60 % in Pyhäsalmi and Ruotanen 60 % in Pyhäsalmi and Ruotanen The deepest mine in Europe The deepest mine in Europe In 1993, after administrative decision, Pyhäjärvi became the 5 th largest town in Finland (by area)! Located close to the geometrical center of Finland; Half way between Jyväskylä and Oulu
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Productivity of the Pyhäsalmi mine
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EMMA Experiment with MultiMuon Array - a cosmic ray experiment located in the mine
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50 m 1-layer 3-layer Parking etc. 10 m EMMA (at the depth of 75 m) 50 m
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CUPP Surfrace Lab
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CUPP Surface Lab
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What is required of a LAGUNA site? Quality of the rock Ready infrastructure Low background from nuclear power plants (essential for geo- and supernova diffusion neutrinos) Seismic stability Presence of scientific activity on site Experienced industrial partner
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Bedrock zones on Earth: Red: very old bedrock, hard crystalline rock usually very good usually very good Green: mobile belts (mountains, etc.), hard rock fair / variable fair / variable White: sedimentary covers (soft rock) often bad often bad
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Seismic levels
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Pyhäsalmi mine
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This tunnel would be extended 500 m to the proposed LENA site
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Dry, room temperature conditions at the 1400m level (below the ground)
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Samples drilled from the LENA tunnel
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All 3 LAGUNA detectors could be placed in Pyhäsalmi
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All caverns are within mine territory! MEMPHYS GLACIER
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Nuclear power plants in Europe (2008)
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Reactor neutrinos Fuel composition: 235 U, 238 U, 239 Pu, 241 Pu Reactor: -Produces electron antineutrinos -Production rate: ~2e20 GW -1 s -1 -prop. to thermal power Propagation through the Earth -Neutrino oscillation -Matter effects negligible Detection: -via inverse -decay (E thr ≈ 1.8 MeV) Background for geo- and supernova diffusion neutrinos
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Neutrino Background from Power Plants based on 2008 data Measured spectra of reactor neutrinos for U-235,Pu-239 and Pu-241 were used. For U-238 calculated spectra were used. Event rates were calculated for a KamLand-type scintillator det.
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Olkiluoto 3 (to open in 2012) EPR (European Pressurized water Reactor) 4.3 GW Thermal 1.6 GW Electrical
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Geo- luminosity of the Earth U-238: Total: 6.65 Above E thr : 0.43 Th-232: Total: 5.30 Above E thr : 0.206 Luminosities [x 10 24 1/s ]
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Effect of reactor neutrinos on Geo-neutrino background Geo -window U + Th: 1.806 - 2.254 MeV U only: 2.254 - 3.27 MeV
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Rockplan Ltd – Finnish industrial partner Underground coal storage for Helsingin Energia, 520.000 m3 District cooling station for Helsingin Energia, 30.000 m3 SALMISAARI underground coal storage
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The underground silos are each 65 m-high x 40 m-diameter with circular plan cross-section. The volumetric capacity of each silo is 81.000 m3. The Salmisaari coal transport tunnel will be re-equipped to charge the silos and a newly-mined conveyor retrieval tunnel will be used to discharge the coal. SALMISAARI underground coal storage
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Summary: Phyäsalmi fulfills all LAGUNA requirements Quality of the rock (the best) Low reactor background (the lowest) Low seismic activity (the lowest) Ready infrastructure (all in place) Clear legal status (signed MoU; all excavation within the mine area) All LAGUNA detectors can be located in Pyhäsalmi (the only site with this distinction?) Experienced industrial partner (Rockplan Ltd.) Competitive excavation & operation costs (yes!) Local support (enthusiastic!)
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Thank you for your attention! ν
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Backup
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Reactor background vs. calculated Geo-neutrino flux [events/a/kton] (1.8 – 3.3 MeV)
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What can be deduced from muons registered underground? 50 GeV cutoff Energy of the initial CR particle Muon density at the core Muon density at the core Approximate Z (but not on the event-by-event basis) Lateral distribution Lateral distribution
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Example of muon distribution induced by a 4 PeV proton
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Simulated change of p / Fe ratio from 80/20 to 20/80 reconstructed by EMMA after 12 months running
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