newage hironobu nishimura ( kyoto university) k. miuchi t. tanimori, h. kubo, s. kabuki, a....
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NEWAGE
Hironobu Nishimura
( Kyoto University)K. Miuchi
T. Tanimori, H. Kubo,
S. Kabuki, A. Takada,
K. Hattori, K. Ueno, S. Kurosawa,
T.Ida, S.Iwaki
A. Takeda (ICRR), H. Sekiya (ICRR)
(New generation WIMP search with an advanced gaseous tracker experiment)
Direction sensitive dark matter search
TAUP2007, SendaiSep.12 2007
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OUTLINE
Direction sensitive DM search
3 D-Track Detector (Micro-TPC)
Surface run result
NEWAGE first run @Kamioka mine
SUMMARY
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1 . Direction sensitive DM search “ WIMP-wind” detection
220km/s
-1 0 1cos γ cos γ
WIMPWIMP WIND WIND γ γ
FFWIMP
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Our Plan of direction sensitive DM serch Gas target + 3D tracking device (next section)
• Tracking recoil nucleus• Gamma rejection by dE/dx
Goal: Detect the WIMP-wind ( 2010~ )• underground ・ low pressure ( CF4 0.05 bar )
• large volume ( 1m3 × N )
CURRENT: • CF4 0.2 bar
• 23×27×30 cm3
Sensitivity
(Spin Dependent)
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2 Detector micro-TPC (micro time projection chamber)
Feb. 20, 2007 APPEAL07
Position Encoder
PIC (×5000)
GEM(×10)
TPC
Particle tracks
e
NIM A 576 (2007) 43 K.Miuchi et.al
40cmTPC
X readout
(768ch) Y readout
(768ch)
FAGA position encoder
(1536ch)
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Gas amplify and read out
Drift Field ~200V/cm
Gas volume• DRIFT length 31cm• CF4 0.2bar gas, sealed
23×28×31cm3
e- cloud
31cm
140μmφ70μm
GEM: Gas gain 2
30cm μPIC
μ-PIC : Gas gain 2000400μm pitch 589,824 pixels
400μm
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•ExampleGas CF4 0.2barAlpha-Particle EventNhit=18Energy=6.5MeVLength=10.2cm
X-Z
X-Y
Z-Y Analog waveform
TPC performance tracking
3D spatial resolution ~ 800μmcf. F(100keV) run 800μm
•Track2D + time = 3D•EnergyAnalog waveform
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Jan 27, 2007 3rd MPGD workshopRecoil direction image
252Cf( NE45° zenith35° )
10
Cos
n
p
CF4+C4H10
252Cf run
Proton tracks
n252Cf
YX-15cm
15cm
15cm
-15cm
30cm
Z(drift)
0cm
CF4+C4H10 (9:1) 0.2bar
Protons have longer tracksn -> p forward scattering are seen (this is what we want to do with WIMP -> F scatterings)
TPC performance direction
Horizon
γ
γ
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TPC performance gamma-ray rejection
gamma-rays from 137Cs
• gamma efficiency < 2e-4 ( statistics limited ) >100keV
137Cs
neutron ( BG )
With 137Cs
Without ( BG run )
Spectrum
subtracted
0 100 200 300 400keV 0
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3 Surface Run
K.Miuchi et. al. To appear in PLB Preprint arXiv:0708.2529
2006 Nov.1st ~ Nov.27th
exposure 0.15 kg days
@Kyoto university (N35.03 E135.783 )
BG spectrum E>100keV L<1cm
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3 Surface Run
SKYMAP
Direction ofWIMP wind
Cosγ distributiondru
0 1
101 102 103
GeV/c2
|Cosγ|
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KAMIOKA LAB-B2006/12/12
KAMIOKA Lab-B 2007/1/19
4 Underground run @Kamioka•In Kamioka mine•2700m w.e depth•10-3 neutron (v.s surface) •No shield•Stable Operation•Background Study
TOKYOKamioka
KYOTO
Super Kamiokande
Sendai
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First operation report @Kamioka
2007 Jan. Feb. Mar. Apr. May Jun. Jul. Aug.
cal
Install
Comissioning run BG run 1 BG run 2
GEM trouble. lost Effective Area
Gasreplace Gas
replace
calcal cal cal
Replace GEM
0.08 0.15BG run exposure [kg∙days]
calcalcal
BG run
2007 Mar 6th ~Aug 6th
0.23 kg∙days8 calibrations run with 252Cf.2 replaces of gasFiducial mass 1.9g
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Spectrum (preliminary)
BGrun1 + BGrun2
0.23kg∙days
Length<1cm, E>100keV
BG decrease
40% of surface
@100keV
blue : Surface Runred : Kamioka first (preliminary)102
101
cts/
kg/k
ev/d
ays
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Background Origin
alpha or heavy particle (Inside Chamber) 222Rn in U chain:
U , Th in drift plane and GEM
DAY
α (5.5, 6.0, 7.6 MeV)
BG spectrum ( fiducial cut only 0~10MeV)
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SUMMARY μTPC (3D imaging device)
• Gas: CF4: 0.2 bar sub mm
Result of Surface run K.Miuchi et. al. to appear in PLB Preprint arXiv:0708.2529
underground run started• Total exposure 0.23 kgday up to Aug.2007• Event rate is 40% of surface run of @100keV
• Now background study
Future work
Reduce Rn, U, Th in detector
Larger Detector , low pressure
Low background run
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Thank you !!
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TPC performanceCF4 0.2atm 24×27×30cm3
Energy resolution
50%(FWHM) @ 5~8 MeV ~70%@100keV
Position resolution
800μm (rms)
angular resolution
~15° (HWHM)
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Fiducial cut
X
Y
RejectReject
Cannot reject
reject by x-y projection
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Energy calibration10B ( thickness 0.6μm )
• 10B(n,a) 7Li reaction (Q=2.70MeV 1.8MeV for )
XY image
keV
spectrum
Energy vs length
keV
Li
2000
spectrum(GEANT4 )
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222Rn emanation and alpha from drift plane
U
232Rn232Rn
232Rn
232Rn
αα
Drift PlaneFiducial area
Increase of peak @ 6MeV With decay constant of Rn (3.8days)
U
Chamber
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Stability(BGrun2)Gas gain
&DAQ rate:
Slow decrease 10%~20% / month
→correct by analysis
→recover
by replacing new gas
5/15 7/1 8/2
HzDAQ rate
Gas gain
1.4
1.0
0.5
0.1
1.4
1.0
0.5
0.1
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Feb. 20, 2007 APPEAL07
Gas gains • operation gain for MIPs ~50,000
Gain curves
Gain map
Gain uniformity • Maximum / minimum = 2.2
TPC performance (with Ar+C2H6 gas)