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Heeger theta13, May 8 2003 A Neutrino Project at Diablo Canyon
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Heeger theta13, May 8 2003 Underground Neutrino Detectors and Locations Solar (SNO) Reactor (KamLAND) Accelerator (LSND) Atmospheric (Super-K) at national laboratories in an old mine in Japan in a nickel mine in Canada
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Heeger theta13, May 8 2003 Sudbury Neutrino Observatory 1,000 t ultrapure heavy water in clean room environment 6800 ft underground 9500 photomultipliers
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Heeger theta13, May 8 2003 KamLAND Balloon Steel Sphere Calibration Deck 1,000 t of liquid scintillator Flammable and toxic
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Heeger theta13, May 8 2003 Diablo Canyon Site
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Heeger theta13, May 8 2003 Location Diablo Canyon powerplant in San Luis Obispo county
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Heeger theta13, May 8 2003 Diablo Canyon From South East From North East
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Heeger theta13, May 8 2003 Diablo Canyon From South East
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Heeger theta13, May 8 2003 Powerful: Two reactors (3.1+3.1 GW E th ) on the California coast Overburden: Horizontal tunnel could give 800 mwe shielding! Infrastructure: Roads built for heavy machinery. Controlled access. Scientific Collaborations: existing collaborations between PG&E and marine scientists, biologists, and geologists with site access. Diablo Canyon Site 1500 ft 600 ft
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Heeger theta13, May 8 2003 Possible Locations for Near Detector Space constrained by hills and infrastructure Best overburden to the North East of the powerplant Distances of near detector: > 0.4 km
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Heeger theta13, May 8 2003 Possible Locations for Near Detector Space constrained by hills and infrastructure Best overburden to the North East of the powerplant Distances of near detector: > 0.4 km
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Heeger theta13, May 8 2003 Far Detector Possible location Crowbar Canyon Parallel to Diablo Canyon Existing road access Possibility for good overburden Tunnels in radial direction from reactor
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Heeger theta13, May 8 2003 ~ 600-800 mwe FAR II: distance 2-2.5 km FAR I: distance 1.5-2 km NEAR: distance~ 0.5 km tunnels ~ 400 mwe A Reactor Neutrino Oscillation Experiment with Fixed Detectors or Variable Baseline Excavation required
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Heeger theta13, May 8 2003 Possible Movable Detector for Diablo Canyon Modular, movable liquid scintillator detector active muon veto V fiducial ~ 80-100 t
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Heeger theta13, May 8 2003 Diablo Canyon Project Some Detector Issues Excavation required Hazardous materials Some Site Issues Environmental impact (statepark and conservation area nearby) Indian burial grounds on PG&E site Status Negotiations with PG&E are underway What are the issues? What is unique to Diablo Canyon? What is the process for environmental impact studies?
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Heeger theta13, May 8 2003
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Heeger theta13, May 8 2003 Sensitivity and Complementarity of 13 Experiments Reactor 13 experiment No matter effect Correlations are small, no degeneracies Independent of solar osc. parameters 12, m 21 2 sin 2 2 13 sensitivity limit m 2 13 dependence True value of m 2 31 (eV 2 ) Sensitivity to sin 2 2 13 10 -1 10 -3 10 -2 Ref: Huber et al., hep-ph/0303232 13 sensitivity of reactor experiments comparable to JHF-SK
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Heeger theta13, May 8 2003 Reactor Neutrino Measurement of 13 Detector 1 Detector 2 Searching for Subdominant Oscillations in e , to measure the last yet undetermined neutrino mixing angle, 13 13 oscillation signature
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Heeger theta13, May 8 2003 13 and CP Violation ? Neutrino Mixing Matrix 13 is key parameter for oscillation phenomenology since 12 and 23 are both large 13 determines whether CP violation is accessible CP proportional to 13 13 is key parameter for oscillation phenomenology since 12 and 23 are both large 13 determines whether CP violation is accessible CP proportional to 13 atmospheric present solar present reactor and accelerator future 0 experiments future
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Heeger theta13, May 8 2003 Movable detectors? Does a site like this exist? Site Requirements 1. A reactor, or multiple-reactor complex 2. Sites for 2-3 detectors at distances of 1-5 km from reactor 3. Detector overburden for reduction of cosmic ray background Man-made overburden or Underground site in a mine (good overburden) Underground site in tunnels (movable detectors) A 13 Reactor Experiment in the US ?
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