“cygnus” - 国立大学法人 神戸大学 (kobe...
TRANSCRIPT
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NEWAGE
Kentaro Miuchi
KOBE University
K. Nakamura(2), Y. Yamaguchi(1) , T.Hashimoto(1), R. Yakabe(1), T. Ikeda(1), R.Taishaku(1), M. Nakazawa(1), T.Tanimori(2), K.Kubo(2), A.Takada(2), H.Nishimura(2), J.D.Parker(2), T.Mizumoto(2), Y.Mizumura(2), Y.Matsuoka(2), S.Komura(2), A.Takeda(3), H.Sekiya(3),(1) Kobe university
(2) Kyoto university
(3) ICRR
Contents
Direction-sensitive DM search
NEWAGE
Underground results
Recent R&Ds
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IDM, CYGNUS…
IDM2006IDM2004
“Nessi”
CYGNUS series
2015 LA
2013 Toyama
2011 Aussois
2009 Boston
2007 Boulby
20 Years10 Years
R. Gaitskel
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Direction-Sensitive Dark Matter Search
“CYGNUS”
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Direction-sensitive dark matter search
Clear detection of dark matter
DM precise study after detection
Difficulty: short track ( a few mm > )
cosθ1-1 0
0
20
40
M=80GeVσ=0.1pb
[count/
3m
3/ye
ar/bin
]
Expected cosq distribution
θ
DM
Nucleus
DRIFT
DM-TPC
NEWAGE MIMAC D3
NITEC
Gas TPC
NEWS DCaNT
ZnWO4 RED
Solid/Liquid
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NEWAGE
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DRIFT
DM-TPC
NEWAGE, MIMAC
D3, NITEC,
NEWAGE-QPIXSee directional talks(slides)
Tuesday, Thursday
and theory talks
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NEWAGEμ-PIC(MPGD) based TPC
3-D tracks SKYMAP
CF4 gas for SD search
Proposal PLB 578 (2004) 241
First direction-sensitive limits
PLB654 (2007) 58
Underground results
PLB686 (2010) 11, PTEP (2015) 043F01s
Phase for “low BG detector”
New general WIMP search with an Advanced Gaseous tracker Experiment
020406080100120140160180
galactic longitude
180200220240260280300320340
ga
lac
tic l
ati
tud
e
-80
-60
-40
-20
0
20
40
60
80
SKYMAP (measured DATA)
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NEWAGE detectorNEWAGE-0.3b’
Detection Volume: 31×31×41cm3
Gas: CF4 at 0.1atm (50keVee threshold)
Gas circulation system with cooled charcoal
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NEWAGE-0.3b’ inside view
Detection Volume: 30×30×41cm3
GEM- 31×32 cm2
- 8-segmented- hole pitch : 140mm- hole diameter: 70mm- insulator : LCP 100mm- gain : ~5- made by Scienergy, Japan
m-PIC(Micro-pixel chamber) - 31×31cm2
- pitch : 400mm- gain : ~1000- made by DNP, Japan
Field cageDrift length: 41cm PEEK + copper wires
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NEWAGE-0.3b’ readouts
m-PIC is X-Y readout
General purpose
FPGA-based electronics
since early 2000’s
256ch
connector
256ch
ASD box
FPGAs
NEWAGE-0.3b’
(inside)
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TOT
(tim
e-o
ver-
thre
sho
ld)
NEWAGE-0.3b’ data
TOT of every strip by FPGA (clock 100MHz)
⇒3D tracks, headtails in X,Y
+
Summed waveforms by FADC (100MHz)
⇒energy, headtails in Z
combined⇒ PID, absolute z
“raw track data”
sample
neutron “image” cosq distribution(100-200keV)
Blue:measured
Green:simulation(s=40deg)
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NEWAGE
Kamioka RUN14 results
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• Energy spectrum• Threshold : 100 => 50keV• BG rate : 1/10@100keV
• Skymap, cosq distribution• Set limit by significant difference in 2-binned measured cosq and DM-wind simulated cosq
RUN5 (NEWAGE-0.3a)RUN14 (NEWAGE-0.3b)
Energy spectrum
skymap
cosθ distribution
50-60keV 100-110keV
RUN14• period : 2013/7/20-8/11, 10/19-11/12
• live time : 31.6 days• fiducial volume:28x24x41cm3
• mass : 10.36g• exposure : 0.327 kg・days
NEWAGE underground run
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• Obtained limit : 557pb @200GeV (Best direction-sensitive limit)
• Improved one order of magnitude from previous RUN5
red : gas, with directional analysisblue : gas, without directional analysis green : solid, liquid detector
PTEP (2015) 043F01s
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Recent R&Ds
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RUN14 (31.6days) + 172.08days
gamma-ray cut improvements
increased statistics
Latest underground data
galactic coordinate
color: efficiency
dots: recoil events
preliminarypreliminary
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Directionality helps!
IBG(Identification of BackGround) study
SKYMAP @ detector coordinate color: number of events
radon peaklower energy
BG identified: upgoing events
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Largest BG source: alpha particle from μ-PIC
Development of radio-pure(BG×1/100) μ-PIC:
10×10㎝2 μ-PIC was made and tested
FY2016: development of 30×30㎝2 μ-PIC
FY2017~: underground run
IBG (cntd.)
t"
C
C’
BB
B’
A
10cm
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minority peaks “discovery” by DRIFT group
SF6 study for GEM+μPIC system
wide dynamic-range ASIC development for
Z-fiducialization
minority peaks (DRIFT group) SF6 study
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2007 ~ biannual workshop
2007 Boulby
2009 Boston
2011 Aussois
2013 Toyama
2015 LA
2017
for 10th aniversary
2016 co-working meetings
Jan Boulby
Apr Roma
July Sheffield
CYGNUS-Kamioka
test chamber
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Summary
NEWAGE :
direction sensitive with 3D track detection.
Sensitivity improvements are on-going.
CYGNUS concept to collaboration