Dark Matter Detection with XENON 100 Accomplishments Challenges

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Dark Matter Detection with XENON 100 Accomplishments, Challenges and the Future http: //xenon. astro.

Dark Matter Detection with XENON 100 Accomplishments, Challenges and the Future http: //xenon. astro. columbia. edu Kaixuan Ni Columbia University Te. V Particle Astrophysics IHEP, Beijing, Sep. 24 -28, 2008

The Challenges for Direct DM Detection WIMP Scattering Rates ➡ large 18 evts/100 -kg/year

The Challenges for Direct DM Detection WIMP Scattering Rates ➡ large 18 evts/100 -kg/year (Eth=5 ke. Vr) mass (ton scale) ➡ low energy threshold (a few ke. V) 8 evts/100 -kg/year (Eth=15 ke. Vr) ➡ background 4 suppression ➡ deep underground ➡ passive shield ➡ low intrinsic radioactivity ➡ gamma background discrimination

World Wide Dark Matter Searches Yangyang KIMS SNOLAB DEAP/CLEA N PICASSO Homestake LUX ?

World Wide Dark Matter Searches Yangyang KIMS SNOLAB DEAP/CLEA N PICASSO Homestake LUX ? Kamioka XMASS Soudan CDMS 5 Frejus/Moda ne EDELWEISS Boulby ZEPLIN DRIFT Gran Sasso CRESST DAMA/LIBR A WARP XENON

The Noble Liquid Revolution • • • Noble liquids (LAr, LXe) are relatively inexpensive,

The Noble Liquid Revolution • • • Noble liquids (LAr, LXe) are relatively inexpensive, easy to scale up Self-shielding reduce external background Excellent gamma background rejection (pulse-shape, or ionization/scintillation) XMASS 800 -kg WARP Single Phase Two Phase (XMASS, CLEAN/DEAP) (XENON, ZEPLIN II/III, WARP, Ar. DM, etc. ) 7

Two-phase Xenon Detectors for Dark Matter Detection WIMPs/Neutrons Top PMT Array nuclear recoil Gammas

Two-phase Xenon Detectors for Dark Matter Detection WIMPs/Neutrons Top PMT Array nuclear recoil Gammas electron recoil 8

Signals from XENON 10 S 1 S 2 9

Signals from XENON 10 S 1 S 2 9

XENON 10 WIMP Search Data 136 kg-days Exposure= 58. 6 live days x 5.

XENON 10 WIMP Search Data 136 kg-days Exposure= 58. 6 live days x 5. 4 kg x 0. 86 (ε ) x 0. 50 (50% NR) (data collected between Oct. 2006 and Feb. 2007) ~1800 events Statistical leakage from electron recoil band Anomalous events due to non-active Xe 4. 5 – 27 ke. Vr noise event WIMP Search Window 11

XENON 10 WIMP-Nucleon Cross-Section Upper Limits Spin-independent Spin-dependent, pure neutron coupling Phys. Rev. Lett.

XENON 10 WIMP-Nucleon Cross-Section Upper Limits Spin-independent Spin-dependent, pure neutron coupling Phys. Rev. Lett. 100, 021303 (2008) Phys. Rev. Lett. 101, 091301 (2008) I I S M D C N O N 10 S M D C XE II N I PL ZE 0 1 N O XEN (NO BKG SUBTRACTION) Constrained Minimal (NO BKG SUBTRACTION) -44 2 8. 8 x 10 cm at 100 Ge. V Supersymmetric Model -39 cm 2 at 30 Ge. V 6 x 10 4. 5 x 10 -44 cm 2 at 30 Ge. V 12

the phased XENON dark matter search program the past (2006 - 2007) XENON 10

the phased XENON dark matter search program the past (2006 - 2007) XENON 10 the current (2007 -2009) the future (2009 -2013) XENON 100 XENON 1 T 13

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Laboratori Nazionali del Gran Sasso, Italy LNGS 1400 m Rock (3100 w. m. e)

Laboratori Nazionali del Gran Sasso, Italy LNGS 1400 m Rock (3100 w. m. e) XENON 100 LVD ICARUS OPERA

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Status of XENON 100: the TPC Assembly 17

Status of XENON 100: the TPC Assembly 17

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XENON 100 Material Screening 19

XENON 100 Material Screening 19

XENON 100 Current Status data MC edge events with poor light collection, will be

XENON 100 Current Status data MC edge events with poor light collection, will be removed by radial position cut all single/multiple scattering events single scatter only with ~46 kg fiducial mass cut Detector has been fully filled with liquid xenon. First Measured background Spectrum in good agreement with MC prediction! 21

XE 100: First Light & Charge Signals (Cs 137) Cs 137 zero field 2.

XE 100: First Light & Charge Signals (Cs 137) Cs 137 zero field 2. 6 pe/ke. V Current effort: Liquid Xenon is continuously purified to achieve better purity 24

Kr removal process was finished on Sep. 24. Currently we are taking data to

Kr removal process was finished on Sep. 24. Currently we are taking data to verify the Kr concentration in Xe. Less than 50 ppt Kr/Xe expected. ~7 ppb before Kr removal process 25

Z [mm] XENON 100 Background Prediction from Simulation r [mm] • • • different

Z [mm] XENON 100 Background Prediction from Simulation r [mm] • • • different fiducial volume cuts (spherical vs cylindrical) to achieve the best bkg rate vs fiducial mass ~6 mdru for a fiducial mass of 40 kg (no gamma background for 3 months) ~2 mdru for a fiducial mass of 20 kg (no gamma background for 1. 5 year) 26

XE 100 sensitivity projection Current Best Limit signal discovery 30 kg x 7 month

XE 100 sensitivity projection Current Best Limit signal discovery 30 kg x 7 month (zero bkg) ~Aug 2009 sensitivity • XENON 100 experiment can probe down to 10 -45 cm 2, but also has great discovery potential! 27

XENON 1 T - the ultimate dark matter detector • • • Explore the

XENON 1 T - the ultimate dark matter detector • • • Explore the full region in CMSSM space New design with full coverage of ultra -low background photodetectors and cryostat Need a deeper underground lab (or efficient muon veto) and larger space Larger International Collaboration To be proposed for 2009 -2013 Total project cost: estimate ~$20 M 28

The Road to Direct DM detection: from XENON 100 to XENON 1 T XENON

The Road to Direct DM detection: from XENON 100 to XENON 1 T XENON 10 (2007) XENON 100 2009 • • • 2010 CDMS (2008) XENON 100 Projected (2009) Super. CDMS Projected (2012) XENON 1 T 2011 2012 XENON 1 T Projected (2012) “Two-Phase Xenon” is currently the most promising technology for DM detection XENON 100 is currently the largest “two-phase xenon” detector under operation Let’s hope we will see WIMPs in 2009! 29

100 100 100 100 100 100 100 100100 100 100 100 100 100 100 100
Dark Matter Search XENON 100 Xiangyu Xie 1152022Dark Matter Search XENON 100 Xiangyu Xie 1152022
Dark Matter Search XENON 100 Xiangyu Xie 1172022Dark Matter Search XENON 100 Xiangyu Xie 1172022
MATTER MATTER Matter MATTER What is matter MatterMATTER MATTER Matter MATTER What is matter Matter
Liquid Xenon Detector and Related Topics Liquid XenonLiquid Xenon Detector and Related Topics Liquid Xenon
Xenon Detector Hardware Liquid Xenon Group Outline DetectorXenon Detector Hardware Liquid Xenon Group Outline Detector
Xenon Detector Status Liquid Xenon Group Outline CryostatXenon Detector Status Liquid Xenon Group Outline Cryostat
DRD6 Liquid xenon detector technology First Xenon LiquefactionDRD6 Liquid xenon detector technology First Xenon Liquefaction
Xenon Detector Status Liquid Xenon Group Outline DetectorXenon Detector Status Liquid Xenon Group Outline Detector
DETECTORS AND DETECTOR ARRAYS Xenon Detectors l XenonDETECTORS AND DETECTOR ARRAYS Xenon Detectors l Xenon
The XENON Project A 1 tonne Liquid XenonThe XENON Project A 1 tonne Liquid Xenon
Xenon Detector Status Report Xenon Detector Group ContentsXenon Detector Status Report Xenon Detector Group Contents
Xenon Element name Xenon Symbol Xe Description ItXenon Element name Xenon Symbol Xe Description It
100 100 100 95 100 96 96 100100 100 100 95 100 96 96 100
100 100 100 25 5010050 25 100 100100 100 100 25 5010050 25 100 100
Large Underground Xenon Dark Matter Search Matthew SzydagisLarge Underground Xenon Dark Matter Search Matthew Szydagis
LUX A Liquid Xenon Dark Matter Detector MasahiroLUX A Liquid Xenon Dark Matter Detector Masahiro
XENON Dark Matter Project Alexandre grandchamp Antoine baillodXENON Dark Matter Project Alexandre grandchamp Antoine baillod
The XENON 10 dark matter search T ShuttThe XENON 10 dark matter search T Shutt
XENON Dark Matter Project Alexandre grandchamp Antoine baillodXENON Dark Matter Project Alexandre grandchamp Antoine baillod
RD of Liquid Xenon TPCs for Dark MatterRD of Liquid Xenon TPCs for Dark Matter