2007.5.9 FJPPL Suekane 1

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

2007.5.9 FJPPL Workshop

@ KEK

Presenters

In short: R&D for Reactor 13 experiments

2007.5.9 FJPPL Suekane 2

Contents of this report

•General description of the Project

• 2006 Activities in Japan

•2006 Activities in France

by F.Suekane

by D.Motta

2007.5.9 FJPPL Suekane 3

2006 FJPPL Members

5 from France 4 from Japan

2007.5.9 FJPPL Suekane 4

2006 Mission & Budget plan

Travel expense: 2x （ France <--> Japon ）

Exchange Information ofKASKA and Double CHOOZ

2007.5.9 FJPPL Suekane 5

from 2007 Proposal

5 from France 4 from Japan

2007.5.9 FJPPL Suekane 6

2007 Proposal

Travel Expenses

Exchange information to proceed DC R&D

2007.5.9 FJPPL Suekane 7

KamLANDSolar experimens

SuperKamikandeK2K, MINOS

Purpose of the experiments

e

2 out of 3 Oscilltions have been confirmed.

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

2007.5.9 FJPPL Suekane 22

Construction sequence

âFíàê ÉgÉâÉbÉJÅ[ê›íu PMTéxéùëï íuâ∫ïî ê›íu äOïî ÉAÉNÉäÉãóeäÌâ∫ïî ê›íu ì‡ ïî ÉAÉNÉäÉãóeäÌê›íu äOïî ÉAÉNÉäÉãóeäÌëgóß

ì‡ ïî ÉAÉNÉäÉãóeäÌÉ ÉÄÉjÅ[ãyÇ—PMTéÊÇËït ÇØ

äOïî ÉAÉNÉäÉãóeäÌÉ ÉÄÉjÅ[éÊÇËït ÇØ

PMTéÊÇËït ÇØÉ ÉÄÉjÅ[ÇÉXÉeÉìÉåÉXÉ ÉìÉNÇ…å≈íË

ìSÉVÅ[ÉãÉhÅAè„ïî âFíàê¸ÉgÉâÉbÉJÅ[ê›íu

2007.5.9 FJPPL Suekane 23

　 LoI: hep-ex/0607013

~80 pages

2007.5.9 FJPPL Suekane 24

After the Merge to DCHOOZ

７ｍ

HV

DividerMonitor

PMT(~800)

Tefloncable

Electro-nics

Front-EndElectronics

Take responsibility of PMT system

2007.5.9 FJPPL Suekane 25

Completed Low-BG Oil-Proof PMT design

2007.5.9 FJPPL Suekane 26

PMT testing box

2007.5.9 FJPPL Suekane 27

PMT Delivery Box

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ǙDZÇÃÉsÉNÉ`ÉÉÇ å©ÇÈÇΩÇflÇ…ÇÕïKóvÇ≈Ç∑ÅB

Ready to GO.

2007.5.9 FJPPL Suekane 28

2007 and Beyond2007 20092008 2011 2012 2013

1 2 3 4 5 6 7 8 9 O N D 1 2 3 4 5 6 7 8 9 O N D 1 2 3 4 5 6 7 8 9 O N D

FARInstallation

Activity in Japan

Activity in France

Receive, test

FAR data taking start

NEAR

NEAR data taking start

400PMTproduction

400PMTproduction

test test

Installationpreparation

2007.5.9 FJPPL Suekane 29

Next Speaker => Dario talks about

French Activities in 2006

2007.5.9 FJPPL Suekane 30

Summary

* Now Japan and France projects have unified as Double Chooz.

* Full proposal in 2006 (hep-ex/0606025)

* 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.