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Status of KASKA. ( Kas hiwazaki- Ka riwa Nuclear Power Station). F.Suekane RC n S, Tohoku Univ. Japan [email protected]. @ Double CHOOZ collaboration meeting 2006.06.06-08. Outline. Brief introduction of KASKA experiment R&D status Fund requesting status Summary. KASKA Members. - PowerPoint PPT Presentation
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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)
06.06 F.Suekane, KASKA 2
Outline
Brief introduction of KASKA experimentR&D status
Fund requesting statusSummary
06.06 F.Suekane, KASKA 3
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
06.06 F.Suekane, KASKA 4
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
06.06 F.Suekane, KASKA 5
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
06.06 F.Suekane, KASKA 6
Detector & Shaft Hole
06.06 F.Suekane, KASKA 7
Structure of KASKA Detector
is similar to DCHOOZ's
06.06 F.Suekane, KASKA 8
Errorefficiency related
+ flux + BKG
Statistic error = 0.4% with 3years run
06.06 F.Suekane, KASKA 9
Expected Sensitivity
(rate only analysis)
SK m2
10x better sensitivity than current CHOOZ limit
06.06 F.Suekane, KASKA 10
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
06.06 F.Suekane, KASKA 11
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
06.06 F.Suekane, KASKA 12
Data Simulation
60cm thick spherical buffer layer
preliminary
preliminary
Need to tune the simulation.
Gd 8MeV peak
d 2.2MeV peak
Ed
06.06 F.Suekane, KASKA 13
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
06.06 F.Suekane, KASKA 14
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
06.06 F.Suekane, KASKA 15
-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
06.06 F.Suekane, KASKA 16
Geology -> shaft hole design
06.06 F.Suekane, KASKA 17
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)
06.06 F.Suekane, KASKA 18
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
06.06 F.Suekane, KASKA 19
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
06.06 F.Suekane, KASKA 20
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
06.06 F.Suekane, KASKA 21
Electronics
* Full digital treatment using FADC & FPGA
* Bank system to kill deadtime
* Quick recovery from saturationTest module
06.06 F.Suekane, KASKA 22
Cosmic-ray tracker
Cosmic-ray tracker
To estimate long-life spallation Backgrounds such as 9Li.
* Liquid Scintillator base* Plastic Scintillator base
06.06 F.Suekane, KASKA 23
Beam test of plastic scintillator
06.06 F.Suekane, KASKA 24
Calibration:Wire manipulation
Mechanical Test Test at prototype (planning)
weight
hook hook
Source
(between PMTs)
06.06 F.Suekane, KASKA 25
Designing WorkWith KEK Engineering Div.
06.06 F.Suekane, KASKA 26
Inner acrylic vessel Outer acrylic vessel
06.06 F.Suekane, KASKA 27
1/2 scale inner acrylic dorm.=90cm, t=1cm)
-> manufacturing method.-> Test of achievable precision
06.06 F.Suekane, KASKA 28
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
06.06 F.Suekane, KASKA 29
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
06.06 F.Suekane, KASKA 30
LoI will appear in ArXiv soon.
~80 pages
06.06 F.Suekane, KASKA 31
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.
06.06 F.Suekane, KASKA 32
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.