2007.5.9 FJPPL Suekane 1 Nu_2-WP2: R&D of detectors for future high statistics, h igh precision experiment (R&D for reactor anti-neutrino experiments) F.Suekane, Tohoku Univ. D. Motta, CEA 2007.5.9 FJPPL Workshop @ KEK Presenters In short: R&D for Reactor 13 experiments
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2007.5.9FJPPL Suekane1 Nu_2-WP2: R&D of detectors for future high statistics, high precision experiment (R&D for reactor anti-neutrino experiments) F.Suekane,
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2007.5.9 FJPPL Suekane 1
Nu_2-WP2:R&D of detectors for future high statistics, high precision experiment
Purpose: To find out the 3rd oscillation by Reactor
2007.5.9 FJPPL Suekane 8
Reactor Neutrino Oscillation
0
0.2
0.4
0.6
0.8
1
1.2
0.1 1 10 100 1000
L(km)
P(_e -->
_e )
13 Measurement by Reactor
sin2213=0.1
Normal Hierarchy
Inverted Hierarchy
KamLAND
€
P ν e → ν e( ) =1− sin2 2θ13sin2 Δm132 L
4E
E=4MeV
Measure 13 at distance 1~2km from reactors
2007.5.9 FJPPL Suekane 9
Reactor 13 Experiment
Reactors
Near Detector(L<500m)
Far Detector(L~1km)
~1.5km
• Measure Disappearance at a distance 1~2km• Small Oscillation Amplitude => Precise measurement is necessary => 2 detectors to cancel systematics => Underground to reduce cosmic-ray backgrounds
2007.5.9 FJPPL Suekane 10
KASKA & DoubleChooz
Kashiwazaki-Kariwa Nuclear Power Station
Chooz Power Station
Early 2006
2007.5.9 FJPPL Suekane 11
R&Ds were going in parallel
Mass Measurement
KASKA DoubleChooz
2007.5.9 FJPPL Suekane 12
2006.9 KASKA Merged to DCHOOZ
KASKA R&D
Double Chooz R&D
Double Chooz Construction
Japan side France side
The FJPPL fund was used for mutual visits to discuss how to unify the two projects.
Merge 2006.9
2007.5.9 FJPPL Suekane 13
2007.5.9 FJPPL Suekane 14
Far detector only
Far & Near detectorstogether
08/2008 2009
sys=2.5%
sys=0.6%
Current limit
20122009 201220112010 2013 2014
2007.5.9 FJPPL Suekane 15
R&D in Japan before the Merge
KASKA Prototype
0.9m3
Gd-LS
0.05% Gd Liquid Scintillator (900L)
Lead Shields
Cosmic-ray anti-counters
Light shield
Paraffin Blocks
N2
to study Gd signalto study BKGto observe reactor
2007.5.9 FJPPL Suekane 16
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Fast Reactor Pth=140MWFrequent ON/OFFL~25m~150 pen reaction/day
25m
KASKA Prototype@Joyo research reactor
KASKA prototype
Currently taking data
2007.5.9 FJPPL Suekane 17
PMT
TTS=2.5ns
Low BKG Glass
Hamamatsu 10"PMT
It is possible to make10"PMT glass as low BKG.
~400/detector13% coverage
1pe signals
2007.5.9 FJPPL Suekane 18
Gd-LS long term stability tests
(preliminary)
BC521 : Pseudocumen(PC) : Tetradecane(TD)
= A ‥ 20% : 20% : 60% B ‥ 30% : 10% : 60% C ‥ 20% : 10% : 70%
T=20deg
T=30deg
T=40deg
No aging at room temp. for 240days
KASKAcandidate
2007.5.9 FJPPL Suekane 19
Calibration:Wire manipulation
Mechanical Test Test at prototype (planning)
weight
hook hook
Source
(between PMTs)
2007.5.9 FJPPL Suekane 20
Designing WorkWith KEK Engineering Div.
2007.5.9 FJPPL Suekane 21
1/2 scale inner acrylic dorm.=90cm, t=1cm)
-> manufacturing method.-> Test of achievable precision