06.06F.Suekane, KASKA1 Status of KASKA F.Suekane RC S, Tohoku Univ. Japan [email protected] @...

06.06 F.Suekane, KASKA 1

Status of KASKA

F.SuekaneRCS, Tohoku Univ. [email protected]

@ Double CHOOZ collaboration meeting

2006.06.06-08

(Kashiwazaki-Kariwa Nuclear Power Station)


Outline

Brief introduction of KASKA experimentR&D status

Fund requesting statusSummary


Niigata University: N.Tamura, M.Tanimoto, H.Miyata, H.Nakano T.Kawasaki, M.Katsumata, T.Iwabuchi, M.Aoki, N.Nakajima, K.SakaiTohoku University: F.Suekane, Y.Sakamoto, S.Tsuchiya, H.TabataTokyo Metropolitan University: T.Sumiyoshi, H.Minakata, O.Yasuda , K.SakumaTokyo Institute of Technology: M.Kuze, K.Nitta, H.Furuta, J.Maeda, Y.FunakiKobe University: T.HaraKEK: N.Ishihara, H.SugiyamaMiyagi University of Education: Y.Fukuda, AkiyamaHiroshima Institute of Technology: Y.NagasakaOsaka University: Nomachi

KASKA Members

~30people


Kashiwazaki-Kariwa NPS

7 powerful reactors(5BWR+2ABWR)

cluster into two groups

0 5 10 15 20 25

P(GWth)

RENO (Korea)

Angra (Brazil)

Daya Bay (China)

Braidwood(USA)

CHOOZ(France)

Kashiwazaki Kariwa (Japan)

Reactor Power

>2010

World's Highest PowerP=24.3GWth

=Strongest luminosity


KASKA-13 Geometry

Reactor and Detector Locations

-200

300

800

1300

1800

2300

-500 0 500 1000 1500 2000

Relative Position (m)

Relative Position (m)NEAR-A Detector

NEAR-B Detector

Reactor-#1#2

#3

#4

#5

#6

#7

FAR Detector

~0.4km70m

~1.6km

150m

~0.35km24.3GW

6ton x 2

~50m

2x6ton

L=1.6kmCan returnto L=1.3km


Detector & Shaft Hole


Structure of KASKA Detector

is similar to DCHOOZ's


Errorefficiency related

+ flux + BKG

Statistic error = 0.4% with 3years run


Expected Sensitivity

(rate only analysis)

SK m2

10x better sensitivity than current CHOOZ limit


R&D

* Boring study at near-B site * Prototype detector * Low BKG PMT * Electronics development * LS developments * Detector and Shaft hole design study * Calibration system * Cosmic-ray tracking system * Design and tests of acrylic vessels


Prototype Detect

or* Test of -catcher.

* Am/Be e like signal.* Cosmic-ray spallation BKG.

e detection at research reactor.

*Magnetic shield test* MC development

Gd-LS

Gd-LS

Am/Be Sources(4.4MeV+n)

0.9m3


Data Simulation

60cm thick spherical buffer layer

preliminary

preliminary

Need to tune the simulation.

Gd 8MeV peak

d 2.2MeV peak

Ed


Prototype @ a research reactor

Joyo Research Reactor,140MW Fast ReactorFrequent ON/OFF~150 reaction/day( flux ~KASKA near)

data taken withvery poor shieldsno cosmic-ray veto

Window(BKG~50/day)

BKG data

after some improvements

Demonstrate detection capability First fast reactor detection (Pu origin)

2006/8~

Ed

Ep

25m


Boring Study @ near-B site (2004.10~11)

Reactor Building #6

scaffold towerfor boring machine

Reactor Building #5

BKG measurementcounting hut

Study of• Geology

• Cosmic-ray BKG • -ray BKG

at real location and depth &

• Real experience to work in the reactor site

Reactor and Detector Locations

-200

300

800

1300

1800

2300

-500 0 500 1000 1500 2000

Relative Position (m)

Relative Position (m)NEAR-A Detector

NEAR-B Detector

Reactor-#1#2

#3

#4

#5

#6

#7

FAR Detector

70m depth


-ray BKG

data

MC

.

E(KeV)

Preliminary

238U/232Th/40K=2.1/6.3/1.5ppm

Preliminary

MC

data

Cosmic-ray BKG

Tuned MC with 20% accuracy


Geology -> shaft hole design


Liquid Scintillators

Region-I(-target): PaloVerde Type BC521:PC:Tetradecane=20:20:60v% Gd=0.1%. Light Output~50% Anthracene

Region-II(-catcher): PC:TD=15:85% + PPO+bis-MSB LO~50% Anthracene

Region-III(Buffer Oil): Paraffin Oil(+PPO LO~5%Anth. optional)


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


PMT

TTS=2.5ns

Low BKG Glass

Hamamatsu 10"PMT

It is possible to make10"PMT glass as low BKG.

~300/detector10% coverage

1pe signals


Issue of Geo-Magnetic Field

(1) 11cm thick iron tank

(2) Compensation Coil

(3) high- metal shield on each PMT

(3) works well for prototype detector

Issue of cosmic-ray saturation ( to measure shower energy)

Install small PMTs to measure cosmir-ray & shower energy


Electronics

* Full digital treatment using FADC & FPGA

* Bank system to kill deadtime

* Quick recovery from saturationTest module


Cosmic-ray tracker

Cosmic-ray tracker

To estimate long-life spallation Backgrounds such as 9Li.

* Liquid Scintillator base* Plastic Scintillator base


Beam test of plastic scintillator


Calibration:Wire manipulation

Mechanical Test Test at prototype (planning)

weight

hook hook

Source

(between PMTs)


Designing WorkWith KEK Engineering Div.


Inner acrylic vessel Outer acrylic vessel


1/2 scale inner acrylic dorm.=90cm, t=1cm)

-> manufacturing method.-> Test of achievable precision


LS compatibility acceleration test (35 deg) of acrylic joint

1day 1week 1month

Before soak

After soakSome incompatibility wasObserved.

Now we think we know how to avoid this effect


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


　LoI will appear in ArXiv soon.

~80 pages


Funding schemes: possible 3 ways * 　 Budget request as University Project * Grant in Aid for Scientific Research　 * Support from KEK

2006

2005

2007

Now

Funding Issue

1st review [End of August] (If it fails, we would like to join to DCHOOZ here) As DCHOOZ request(Sep.-Oct.) We would like prepare the request form from now.

If GASR is approved the fund will be available from here.

JFY(Apr.-Mar.)

If KEK decides to support us, we may be able to start before next JFY starts.


Summary

(1) KASKA uses highest reactor power, optimum baseline and can measure sin2213 with 10 times better sensitivity o

f current limit.(2) R&D has been progressing. (3) Now struggling for funding. We will know in the end of August if our final trial fails. (4) In that case, we would like to join DCHOOZ and do next b

udget request for DCHOOZ. If the request is <$5M, the probablity of approval is high.

(5) In any case we would like to start to plan the next budget request as DCHOOZ.

06.06F.Suekane, KASKA1 Status of KASKA F.Suekane RC S, Tohoku Univ. Japan [email protected] @...

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