K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy Direction-Sensitive Dark Matter Search --NEWAGE-- Kentaro Miuchi (Kyoto University) (New generation WIMP search with an advanced gaseous tracker experiment) with H. Nishimura, T. Tanimori, H. Kubo, K. Hattori, C. Ida, S. Iwaki, S. Kabuki, A. Takada, K. Ueno A. Takeda, H. Sekiya

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy OUTLINE Motivation Methods Surface measurement Latest activities Summary

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy Motivation

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy １. Motivation “WIMP-wind” detection The WIMP-wind WIMP V 0 =230 km/s SOLAR SYSTEM 220 km/s PLB 578 (2004) 241 low pressure gas forward recoils short tracks

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy WHY “Direction-sensitive” ? Large mass for exclusion （ and indication ） BUT Annual modulation is not enough… Direction-sensitive for a concrete evidence and further study of halo dark matter WIMP WIND γ F F Annual modulation direction

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy Expected Sensitivities Goal: Detect the WIMP-wind low pressure ( CF bar ) ・ large volume （ 1m 3 × N ）・ radio-pure materials CURRENT: pilot run CF bar ・ (0.3m) 3 ・ normal materials 0.3m 3 year 3m 3 year expected sensitivities

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy Methods

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy 2 Methods (3D tracking device) Feb. 20, 2007 APPEAL07 Position Encoder  PIC (×5000) GEM(×10) TPC Particle tracks e Preprints: physics/ K.Miuchi et.al 40cm TPC X readout （ 768ch ） Y readout （ 768ch ） FAGA position encoder （ 1536ch ） NEWAGE-0.3a : 23×28×31cm 3

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy Readout electronics 768 anode cathode Digital (LVDS) signals at ASD (X,Y,T) at the position encoder 31cm gas volume TPC system Gas volume DRIFT length 31cm CF 4 0.2bar gas 100MHz, pipeline 2D imaging device:  -PIC (gas gain 5000) 400mm pitch pixels readout 30cm μPIC (Toshiba)

K. Miuchi CF 4 +C 4 H 10 (9:1) 0.2 atm n -> p forward scattering (emulation of WIMP -> F scatterings) Jan 27, rd MPGD workshop Recoil direction image 252 Cf （ NE45° zenith35° ） 1 0 Cos   n p CF 4 +C 4 H Cf run Proton tracks n 252 Cf Y X -15cm 15cm -15cm 30cm Z(drift) 0cm TPC Performance please note: these performance are still in progress nuclear tracking

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy Other parameters (still in progress) Energy resolution 5~8 MeV Position resolution 800 μ m (rms) angular resolution ~25° (HWHM)

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy surface measuremant

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy Surface run ① 2006 Nov.1 st ~ Nov.27 th exposure 0.15 kg days (=0.0089kg university (N35.03 E ） Energy spectrum （ conventional method ） Energy spectrum K.Miuchi et.al., PLB654 (2007) 58

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy Surface run ② The sky map (by nuclear recoil tracks) flat neutron background is seen North sky view seen by C and F nuclei ( keV) DM direction

K. Miuchi Jan 27, rd MPGD workshop Surface run ③ Cosθ distribution consistent with a flat distribution Cosθ 分布 ( keV) DM limit First step to the NEWAGE WE ARE HERE FIRST Direction-sensitive Results!

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy Recent activities Sensitivity improvement Scaling-up

K. Miuchi Kamioka Kamioka mine 2700m w.e depth stable operation Background Study Kamioka Kyoto SK Lab-B XMASS 100kg

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy underground measurement Jan Mar July Aug Dec DM run 1 DM run 2 ¼ volume DM run exposure [kg∙days] Total 0.61kg ・ days BG rate surface run ×40 ％ （ src: detector components ） Material screening, started Comissioning run DM run3 Comissioning run black: surface blue: underground(preliminary ） full volume

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy Further R&Ds readout pixel-type ASIC “QPIX” (with KEK) Scaling-up NEWAGE-0.3b performance test just started detection volume 31×31×50cm 3 (cf. NEWAGE-0.3a: 23×28×31cm 3 ) low pressure gas current 0.2 bar / design 0.05 bar to lower the threshold (100keV -> 30keV) 60cm

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy SUMMARY NEWAGE: direction-sensitive DM exp. Surface run: First Direction-sensitive results BG-reduction and scaling-up studies are on-going

K. Miuchi K. Miuchi July 10, 2008 Dark Matter and Dark Energy Concluding message I hope NEWAGE becomes “A NEW HOPE” soon… Japanese Enthusiastic Dark matter Investigator former JEDI (2005)

K. Miuchi July 10, 2008 Dark Matter and Dark Energy