NEWAGE. Kentaro Miuchi (Kyoto University) (New generation WIMP search with an advanced gaseous tracker experiment)

Transcription

1 Kentaro Miuchi (Kyoto University) with K. Nakamura, H. Nishimura T. Tanimori, H. Kubo, J. Parker, A, Takada, S. Iwaki, T. Sawano, Y. Matsuoka, Y. Sato, S. Komura (Kyoto) A. Takeda, H. Sekiya (Kamioka) NEWAGE (New generation WIMP search with an advanced gaseous tracker experiment) A. Sugiyama, M. Tanaka, T.Fusayasu (QPIX)

2 NEWAGE overview Since CYGNUS 2009 OUTLINE sensitivity improvement : NEWAGE-0.3a(Kamioka) for next step: NEWAGE-0.3b(Kyoto) fundamental studies: NEWAGE-0.1a (Kyoto) R&D for future: QPIX(KEK) Summary

3 NEWAGE:overview μ PIC (developed in Kyoto) ( one of the Micro Patterned Gaseous Detectors) μpic structure NEWGAE History μpic SPECs 30 30cm 2 Gas amplification + readout 400mm pitch readouts with GEM (sub amplifier) 3D tracks CF 4 Proposal PLB 578 (2004) 241 first result PLB 654 (2007) 58 underground result PLB 686 (2010) 11

4 Readout electronics DIGITAL : Tracking 768 anode cathode Digital (LVDS) signals at ASD (X,Y,T) at the position encoder 100MHz pipeline TPC system ANALOG : energy 768 cathode sum--> 4ch ASD DATA size 16k byte /event ~ 20Gbyte ENCODER

5 As of CYGNUS 2009 First underground results The sky map --> cosq distribution --> upper limits (PLB 686 (2010) 11 ) DM direction North sky by C and F nuclei ( keV) Cosθ distribution direction-sensitive upper limits ( keV) 10 GeV 100 GeV 1000 GeV

6 first step BG 10 sensitivity improvement : NEWAGE-0.3a(Kamioka) for next step: NEWAGE-0.3b(Kyoto) fundamental studies: NEWAGE-0.1a (Kyoto) R&D for future: QPIX(KEK)

7 NEWAGE-0.3a (Kamioka) TPC Y readout (768ch) cm 3 152torr CF 4 = 11.48g X readout (768ch) FAGA position encoder (1536ch)

8 Radon: charcoal gas circulation system monitor radon rate (~6MeV) radon rate 1/10 after day10 charcoal filter ~100g (TSURUMICOAL 2GS)) getter pump (SAES GETTER C400-2DSK) circulation (Teflon bellows pump) without charcoal with charcoal NEWAGE0.3a 152 torr CF4 gas cf:1e5counts/kg/days~1bq/m 3

9 gamma: precise gain map old gain map new gain map NEWAGE0.3a 152 torr CF4 gas 20cm γ run γ run 63 events 5 events

10 radon, gamma, alpha: "clean" materials to <1/10 radon emanation level glass-reinforced fluoro-plastic PTFE + copper wire DM run, just started.

11 sensitivity improvement : NEWAGE-0.3a(Kamioka) for next step: NEWAGE-0.3b(Kyoto) fundamental studies: NEWAGE-0.1a (Kyoto) R&D for future: QPIX(KEK)

12 NEWAGE-0.3a by K. Nakamura) cm 3 76 torr CF 4 μ-pic 電圧 :515V GEM -450V/-230V VD:-3.32kV

13 DM detection confidence level Gas pressure energy threshold: limited by track length lower pressure for higher sensitivity optimum: ~30torr NOW working on: torr VECTOR tracking AXIAL tracking Measured detection efficiency angular resolution

14 relative detection efficiency Detection efficiency for nuclear tracks 252 Cf run: fast neutron irradiation threshold 100keV 70keV (expected 50keV) Preliminary NEWAGE0.3b 76/152 torr CF4 gas red:76torr blue:152torr Angular resolution degree with 152torr gas re-measure with higher gas gain

15 sensitivity improvement : NEWAGE-0.3a(Kamioka) for next step: NEWAGE-0.3b(Kyoto) fundamental studies: NEWAGE-0.1a (Kyoto) R&D for future: QPIX(KEK)

16 NEWAGE-0.1a light-read test cm 3 for fundamental and challenging studies 55 Fe source with shutter 10 B coated glass TODAY Samarium source thicker GEM(100μm)

17 gas gain 55Fe calibration 40% NEWAGE0.1a 152 torr CF4 gas gain curve NEWAGE0.1a 152 torr CF4 gas 1e5 this measurement kev 1e3 with 10B alpha 400 anode[v] 600

18 Calibration with 10 B 10 B(n,a) 7 Li reaction (Q=2.70MeV ~1.5MeV a ) 10 B ( 1.5mm thickness ) coated glass irradiate with thermalized neutrons NEWAGE0.3a 152 torr CF4 gas NEWAGE0.3a 152 torr CF4 gas red : DATA ( /per7-9) blue: simulation

19 thermal neutron imaging Aluminum vessel Drift cage Parker+ 3 He(n,p)t reaction Ar-C 2 H 6-3 He(30%) gas 2atm detection efficiency ~30% Time resolution ~1 μs for each neutron interaction. proton neutron position triton Preliminary position resolution <150μm resonance imaging by TOF 身内賢太朗

20 FPGA firmware update wrote from scratch (by A. Takada) Analysis code by Mark Pipe (DRIFT) record all HIT-STRIP with 100MHz ~ charge data by pulse duration 30ns 20ns Before: online reduction for high-rate acquisition 10ns 0ns Head/tail discrimination T Y x red: HIT strip(this work) orange: Before

21 DRIFT[cm] pulse duration[10ns] Y[cm] Y[cm] 55Fe electron track X[cm] DRIFT[cm] X[cm] X[cm] Y[cm]

22 DRIFT[cm] pulse pulse duration[10ns] width[10ns] μ track X[cm] DRIFT[cm] X[cm] X[cm] Y[cm] 22

23 pulse duration[10ns] width[10ns] neutron nuclear track X[cm] DRIFT[cm] X[cm] neutron X[cm] Y[cm] 23

24 pulse duration[10ns] width[10ns] neutron X[cm] DRIFT[cm] X[cm] X[cm] neutron Y[cm] 24

25 sensitivity improvement : NEWAGE-0.3a(Kamioka) for next step: NEWAGE-0.3b(Kyoto) fundamental studies: NEWAGE-0.1a (Kyoto) R&D for future: QPIX(KEK)

26 QPIX PIXEL readout ASIC QPIX-ver1 "ultimate" μtpc ADC test QPIX.v.1 SPECs channel size 200 x 200μm ch/chip TOF: 14 bits TOT: 8 bits ADC: 10 bits, 10Msps 1.5fC~1.5pC TOF test functions: mostly OK

27 Mounting all pixel-type ASIC suffers from gaps (dead area) between chips 2 2 mounted ceramic board gas QPIX bump bonding "whole chain" confirmed to fix details

28 SUMMARY NEWAGE-0.3a: BGs 1/10 DM run just started NEWAGE-0.3b: 76torr test going on NEWAGE-0.1a: 55Fe spectrum, head-tail test QPIX: 20 20test chip, gas less mounting