The LZ Program. Bob Jacobsen UCLA Dark Matter 2012 For the LZ Collaboration

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1 The LZ Program Bob Jacobsen UCLA Dark Matter 2012 For the LZ Collaboration 1

2 The LUX Collabora.on Brown Richard Gaitskell Simon Fiorucci Research Associate Monica Pangilinan Jeremy Chapman Carlos Hernandez Faham David Malling James Verbus Case Western Thomas Shutt Dan Akerib Mike Dragowsky Research Associate Professor Carmen Carmona Ken Clark Tom Coffey Karen Gibson Adam Bradley Patrick Phelps Chang Lee Kati Pech Harvard Masahiro Morii Michal Wlasenko John Oliver Electronics Engineer Lawrence Berkeley + UC Berkeley UC Santa Barbara Harry Nelson Dean White Engineer Susanne Kyre Engineer LIP Coimbra Isabel Lopes Jose Pinto da Cunha Assistant Professor Vladimir Solovov Senior Researcher Luiz de Viveiros Alexander Lindote Francisco Neves Claudio Silva SD School of Mines Xinhua Bai, Physics Group Leader Mark Hanardt Texas A&M University of Rochester Frank Wolfs Wojtek Skutski Senior Scientist Eryk Druszkiewicz Mongkol Moongweluwan Bob Jacobsen Professor Bill Edwards Engineer David Taylor Engineer Mia Ihm Adalyn Fyre Undergraduate Student Lawrence Livermore Adam Bernstein PI, Leader of Adv. Detectors Group Dennis Carr Mechanical Technician Kareem Kazkaz Staff Physicist Peter Sorensen University of Maryland Carter Hall Douglas Leonard James White Robert Webb Rachel Mannino Tyana Stiegler Clement Sofka UC Davis Mani Tripathi Robert Svoboda Richard Lander Britt Hollbrook John Thomson Matthew Szydagis Jeremy Mock Melinda Sweany Nick Walsh Michael Woods Sergey Uvarov Professor Professor Professor Senior Engineer Senior Machinist Dongming Mei Wengchang Xiang Chao Zhang Oleg Perevozchikov Daniel McKinsey Peter Parker James Nikkel Sidney Cahn Alexey Lyashenko Ethan Bernard Blair Edwards Louis Kastens Nicole Larsen U. South Dakota Yale Professor Research Scientist Lecturer/Research Scientist 1 2

3 LUX 350kg total LXe 3

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6 What s the next step? More massive target: 5-6T Backgrounds: Stay at <1 evt 6

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8 LUX LN Dewar. Control Panel Five thermosyphons in this conduit 8

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12 ~ 1.2 m 12

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15 PMTs - R11410 MOD PMT 238U [mbq/ PMT] 232 Th [mbq/ PMT] 40 K [mbq/ PMT] 60 Co [mbq/ PMT] R ± ±0.3 66±2 2.6±0.1 R11410 MOD <0.4 <0.3 < ±0.2 15

16 Central Active Xe PTFE Xe Skin Ti Liquid Scintillator (IsoHexane) 16

17 Thermosyphon dewar Scintillator cell 17

18 Central Active Xe PTFE Xe Skin Ti Liquid Scintillator (IsoHexane) 1500keV gammas into 2π Veto Efficiency Comment No Veto 25% (Reflect from PTFE) Liquid Scintillator Only 78% 1 cm Xe skin Add Active Plastic Layer 92% 0.5 cm Xe skin Active Xe Skin 98% 4 cm Xe skin 18

19 Monte-Carlo Efforts LZ Shielding Muon-induced neutrons production, propagation through 12 m diameter water shield NR event rate in LZ 20 tonne detector ~0.3 ndrur in [5 25 kevr], before any cuts Fiducial, single scatter, EM component cuts, allow two more orders of magnitude rejection Effect of 1 m thick liquid scintillator active veto With threshold at 100 kev, rejection of external neutrons >99.3% Effect of Ti and steel vessels thickness à Safe for LZS or LZD by several OoM LUX internals screening and background modeling program Extensive cataloguing of parts/materials Identify hot spots for similar designs Built-in modeling tool/map for quick estimate Cross-check of MC parameters with the international community One LUX/LZ member on advisory panel of Berkeley Cosmogenics workshop, April 2011 S. Fiorucci Brown University 19 19

20 Summary LZ program toward 5-6T scale detector in Davis Cavern Straight-forward route to higher sensitivity Key development efforts toward control of backgrounds. 20

The LUX Experiment - Background Model and Physics Goals. D. Malling April APS, Denver, CO

The LUX Experiment - Background Model and Physics Goals. D. Malling April APS, Denver, CO The X Experiment - Background Model and Physics Goals D. Malling April APS, Denver, CO 2013-04-13 X Background Goals Background goal: