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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FJPPL Suekane1 Nu_2-WP2: R&D of detectors for future high statistics, high precision experiment (R&D for reactor anti-neutrino experiments) F.Suekane, Tohoku Univ. D. Motta, CEA FJPPL KEK Presenters In short: R&D for Reactor  13 experiments

FJPPL Suekane2 Contents of this report General description of the Project 2006 Activities in Japan 2006 Activities in France by F.Suekane by D.Motta

FJPPL Suekane FJPPL Members 5 from France4 from Japan

FJPPL Suekane Mission & Budget plan Travel expense: 2x （ France Japon ） Exchange Information of KASKA and Double CHOOZ

FJPPL Suekane5 from 2007 Proposal 5 from France4 from Japan

FJPPL Suekane Proposal Travel Expenses Exchange information to proceed DC R&D

FJPPL Suekane7 KamLAND Solar experimens SuperKamikande K2K, MINOS Purpose of the experiments e   2 out of 3 Oscilltions have been confirmed. Purpose: To find out the 3rd oscillation by Reactor

FJPPL Suekane8  13 Measurement by Reactor sin 2 2  13 =0.1 Normal Hierarchy Inverted Hierarchy KamLAND E=4MeV Measure  13 at distance 1~2km from reactors

FJPPL Suekane9 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

FJPPL Suekane10 KASKA & DoubleChooz Kashiwazaki-Kariwa Nuclear Power Station Chooz Power Station Early 2006

FJPPL Suekane11 R&Ds were going in parallel Mass Measurement KASKA DoubleChooz

FJPPL Suekane KASKA Merged to DCHOOZ KASKA R&D Double Chooz R&D Double Chooz Construction Japan sideFrance side The FJPPL fund was used for mutual visits to discuss how to unify the two projects. Merge

FJPPL Suekane13

FJPPL Suekane14 Far detector only Far & Near detectors together 08/  sys =2.5%  sys =0.6% Current limit

FJPPL Suekane15 R&D in Japan before the Merge KASKA Prototype 0.9m 3 Gd-LS to study Gd signal to study BKG to observe reactor

FJPPL Suekane16 Fast Reactor P th =140MW Frequent ON/OFF L~25m ~150 p  e  n reaction/day 25m KASKA research reactor KASKA prototype Currently taking data

FJPPL Suekane17 PMT TTS=2.5ns Low BKG Glass Hamamatsu 10"PMT It is possible to make10"PMT glass as low BKG. ~400/detector 13% coverage 1pe signals

FJPPL Suekane18 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 KASKA candidate

FJPPL Suekane19 Calibration: Wire manipulation Mechanical Test Test at prototype (planning) weight hook Source (between PMTs)

FJPPL Suekane20 Designing Work With KEK Engineering Div.

FJPPL Suekane21 1/2 scale inner acrylic dorm.  =90cm, t=1cm) -> manufacturing method. -> Test of achievable precision

FJPPL Suekane22 Construction sequence

FJPPL Suekane23 LoI: hep-ex/ ~80 pages

FJPPL Suekane24 After the Merge to DCHOOZ ７ｍ HV Divider Monitor PMT (~800) Teflon cable Electro- nics Front-End Electronics Take responsibility of PMT system

FJPPL Suekane25 Completed Low-BG Oil-Proof PMT design

FJPPL Suekane26 PMT testing box

FJPPL Suekane27 PMT Delivery Box Ready to GO.

FJPPL Suekane and Beyond OND OND OND FAR Installation Activity in Japan Activity in France Receive, test FAR data taking start NEAR NEAR data taking start 400PMT production 400PMT production test Installation preparation

FJPPL Suekane29 Next Speaker => Dario talks about French Activities in 2006

FJPPL Suekane30 Summary * Now Japan and France projects have unified as Double Chooz. * Full proposal in 2006 (hep-ex/ ) * Material procurement underway * 2007/08 is the DCHOOZ (Far det.) construction phase. * The first data taking is expected to start in 2008 and the first result is expected to come out in 2010.