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Neutrino beam line Neutrino beam line at Jat J--PARCPARC
Yoshikazu Yamada (KEK)Yoshikazu Yamada (KEK)Talk at Talk at ““Neutrino Super Beams, Neutrino Super Beams,
Detectors and Proton DecayDetectors and Proton Decay””BNL, March 3, 2004BNL, March 3, 2004
ContentsContents••IntroductionIntroduction••Proton beam lineProton beam line••Target & neutrino beamTarget & neutrino beam••Neutrino DetectorNeutrino Detector••Schedule and budgetSchedule and budget••SummarySummary
T2K projectT2K project
νµ→ νx disappearance
νµ→ νe appearanceNC measurement
Kamioka
~1GeV νµ beam(×100 of K2K)
J-PARC(Tokai)0.75 MW 50 GeV PS
Super-K: 50 ktonWater Cherenkov
sin22θ13 from νe appearance
excludedby CHOOZ
x20
sin22θ13>0.006(90%)
4 MW ?
Hyper-K?
T2K(Tokai To Kamioka) collaboration started2
PV2PQ5
PQ2A
PQ4A
PH3 PQ4BPQ3B
PV1PD21 .9 2 deg. bend
PQ3APQ2B PH1
1.92 deg. bend
PQ1
PD1 PH2
コンプレッサー室
冷凍機室
カードル置場
液体窒素タンク
バッファタンク
電気室
N M 1低温棟
5,800l/min(低温設備) 980l/min(磁石電源)
N M 2
ヤード
~4,500l/m in(磁石汚染)
トンネル空調
TS換気
電気ヤード
機械ヤード
冷却棟
4%slope
保安林伐採エリア
ND1
ND2
μピット1鉄
置場
μピット
測定室
電源ヤード
DQ 2
D D 2
H orn1
D D 1
D Q 1
D D 3
D Q 3 D Q 4
H orn2
電源室
シャッター
電気室
D SV D SH
サブトンネルA
サブトンネルB
サブトン
ネルC
サブトンネルD
輸送道路レベルTP+9.3mへ。
土盛り上面はTP+10.8m保存するため法面発生。
ニュートリノ建屋を輸送道路側へ3m、8間道路から
離れる方向へ5m移動。(020207小林隆)
建屋壁面より5m離れたところまで保安林伐採。
伐採面積計:0.286haSM 1 ST1
SM 2ST2
ST3 ST4
U D 1
U Q 3
U Q 1 U Q 2
U V 1 U V 2
U H 3
U H 2
U Q 4電源棟
UQ 5
U D 2 U H 1
制御室
出入管理
W C
WC
適当な広さ
37.5m
4%slope
放射化
物保管室
2.4 3.63.03.6 2.4
13.5
μピット1
3.0
20.0
6.6
3.0
6.6
30.0
5.65.6
3.0
4.64.6
4.57.0
3. 5
15.0
5.0 5.0 5.0 μピット2
2.50
2.00
8.00
4.00
2.50
1.50
3.00
3.50
1.50 1.50
2.00
3.50
60.0
130.0
25,000
Decay volume
Near detector
TargetStation
Dump &µ-monitor
28
0m
13
0m
Neutrino beam facilityNeutrino beam facility
Primary proton beam linearc section (super-conducting)straight sec. (normal-conducting)
Target/Horn systemDecay volume (130m)Beam dumpMuon monitorsNear neutrino detector (280m)Second near neutrino detector (~2km): not approved yet
Components
Approved in Dec. 2003Approved in Dec. 2003for 5 years constructionfor 5 years construction
3
F H1F
Q1
PD11.92 deg. bend
PC4PQ5 PH3
PC3 PQ3PQ4
PV2PC2 PC1
1.92 deg. bend
PD2PV1
引き出し基準点x=49615028.58, y=69561283.94
ニュートリノ・ビームライン
PQ2A PQ1
PH1PH2
サスペンション型
クレーン(20t x 2)
FV2
FQ4
FV1
FQ3
FH2
FV2
FQ2
Proton beam lineProton beam line
Preparation sectionNormal conducting magnets
Arc Section84.5o, R=105m,Super conductingmagnets
Final Focusing Section
Normal conducting magnets
Specification (50GeV)
Single turn fast extraction
8 bunches/~5µs
3.3x1014protons/spill
Cycle: 3.64 second
ε=6π mm.mr, ∆p/p=0.31%
(ε=7.5π mm.mr,
∆p/p=0.36% @40GeV)4
Beam LossBeam Loss
下げ
F H1F
Q1
PD11.92 deg. bend
PC4PQ5 PH3
PC3 PQ3PQ4
PV2PC2 PC1
1.92 deg. bend
PD2PV1
引き出し基準点x=49615028.58, y=69561283.94
ニュートリノ・ビームライン
PQ2A PQ1
PH1PH2
サスペンション型
クレーン(20t x 2)
FV2
FQ4
FV1
FQ3
FH2
FV2
FQ2
Preparation section0.75kW (0.1%)controlled by collimators
50GeV ring0.5W/m
Final Focusing section0.25kW (0.03%)
Arc Section1W/mto assure hands-on maintenanceand below quench limit
Fast extraction(kicker, septum)1.1kW (0.15%)
5
Assumed by HAND Shielding design based on assumptionSame order as KEK-PS beam line
~102 relative suppression required
Preparation sectionPreparation section•Matching beam from PS to ARC section
Collimators to minimize beam loss& heat load at super-conducting magnets
beam
Top view
beam
Arc section~1cm
Monitorshorizontalvertical
Dipole(H):2Quadrupole:5Steering:55 with MIC
Acceptance: 60π mm.mr
Preparation section
ε=6πmm.mr
collimator
6
Arc sectionArc section
14 cells of “Combined Function”super-conducting magnets
>200π mm.mr acceptance
Two magnets in one cell
Common cryostat design to LHC arc magnets⇒Reduce Cost & Risk
monitors
7
Combined functionCombined function
Dipole OR
Quadrupole Combinedfunction
•Combined function magnets to save space and cost•First application for super-conducting magnet
Dipole Field: 2.587 TQuad. Field: 18.62 T/mInductance: 14mHMagnetic Length: 3.3mCurrent: 7345AStored Energy: 0.38MJ8
R&D for magnetR&D for magnet•Cryogenic Science Center of KEK
Trial Yoke Pack & Plastic Collar
Trial winding of coil at KEK9
Final focusing sectionFinal focusing section
Vertical dipole magnetsto change off-axis angle (2º~3º)
Side view
σr~6mm at target
Arc section6πmm.mr
Monitorshorizontalvertical
•Bending/focusing beam to target
Final focusing section
Dipole(V):2Quadrupole:4Steering:2
10
Beam monitorsBeam monitors
FFTSν-Beam
Arc
PS
I,C,P
C,P
C,P
I,C,P
C,P
C,P
C,P
C,PC,PC,PC,P
PP
P
C,P
C,P
C,P
I,C,PI,P
Target
Beam Monitor•I : Intensity (CT)•C: Center position (LPM)•P: Profile (SSEC/RGBPM)•Loss monitor
11
Off Axis BeamOff Axis Beam
Eπ5
Eν
θ=2.0°
θ=0°
0
1
)cos(2
22
θππ
µπν pE
mmE
−
−= θ=3.0°
θ=1.0°
•WBB is intentionally misaligned from detector axis
•Quasi monochromatic beam
•Off axis angle: 2º~3º tuned for oscillation maximum
Statistics at SK: (OAB 2º,1yr,22.5kt)
• ~3000 νµ CC(~x100 of K2K)• νe ~ 0.2% at νµ peak
νµOA3°OA2°OA1°
Osc. Prob.=sin2(1.27∆m2L/Eν)
∆m2=3x10-3eV2
L=295km
osc
.max.
Eν
θTarget
Horns
Decay volume SK
(ref.: BNL-E889 Proposal)
12
Target stationTarget station33m
Iron shield
Concrete blocks
Target & 1st horn
Beam window
2nd horn 3rd horn
Final focus
Decay volume
Concrete structure
Ground level
Baffle
22m
Iron shield
Helium container
Machine room
Service pit
Storage for radioactive material
11m40 ton crane
22m
13
TargetTarget
50
100
150
200
250
(oC)
図 ク ラ゙ファイトターケ ッ゙トの温度変化(C12初期)
0
50
100
150
200
250
300
37.619999 37.620000 37.620001 37.620002 37.620003 37.620004 37.620005 37.620006
経過時間(sec)
温度
(℃
)
中心軸最高温度部
外表面最高温度部
37.62000 37.62002 37.62004 (sec.)
•Carbon Graphite target: 30mm(D)x900mm(L)•1021 protons in a year•Energy deposit: 58kJ/spill•Cooled at outer surface
Max. 236oC at center
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0
経過時間(sec)
中心軸最高温度部
外表面最高温度部
C1C 2 C 3 C 4 C 5 C 6 C 7 C 8 C 9 C 10 C 11 C 12
50
100
150
200
250
(oC)
0 5 10 15 25 3020 35 40 (sec.)
1014 P/spillσr=6mm
Max. 85oC at surface
58ns
598ns
3.53s
5µs
Water cooling
beam structure
14
Cooling of targetCooling of target
Two scenarios•Water cooling
•Required thermal transfer (6kW/m2K)was achieved in test setup.
•Shrink in container due to radiationdamage may be a problem.⇒ irradiation test at BNL
•Helium gas cooling•No container for graphite•Entrance window required•Under discussion
Coolant flow
container(?)
Graphite targetbeam
Helium cooling
500ºC@surface
600~700ºC@center
15
Horn systemHorn system
OAB 0.0deg
0
500
1000
1500
2000
2500
3000
x 103
0 1 2 3 4 5 6 7 8 9 10(GeV/c)
•Converge secondary pions into decay volume
•3 horn system•Carbon target in 1st horn•Made by Aluminum•320kA pulse current •Water cooled inside•Under design and R&D
Perfect horn(accept. 180º)
T2K horn
100 cm100 cm1400 2000
900
472
2500
1400
809
1st Horn 2nd Horn 3rd Horn
Targetbeam
Eν (GeV)16
R&D for hornR&D for horn
•Thermal analysis
1.1x107 repetitionNo damage by repetition fatigue was found.
Pulsed load Test
FSW
HITACHI, Ltd.
••Test of Friction Stir WeldingTest of Friction Stir Welding
82ºC at maximum
図 温度解析結果/内部導体最高温度部の温度履歴
0
10
20
30
40
50
60
70
80
90
0 5 10 15 20 25 30 35 40 45 50
時間(s)
温度
(℃
)
①
②
③
④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬
0 10 20 30 40 50Time (second)
40
20
60
80
0
Temp.(ºC)
Cooled by water mist
17
Test of water mist
Decay volumeDecay volume3NBT (BT between 3GeV&MLF)constructed in 2005
Decay Volume ~110m
OA2oOA3o
Target Station~15m Dump
~10m
50m under 3NBT will be constructed in 2004
•Off axis angle : 2º~3º
•Cross section : Square box shape
(2.2m(W)x2.8m(H)~3.0m(W)x4.6m(H))
•Consists of iron plates with water cooling channels
•Filled by 1atm Helium
•Surrounded by 6m thick concrete 18
Cooling of DVCooling of DV•DV should work with 4MW beam
•FEM analysis for 4MW beam
•Iron plate <60ºC
•Concrete <120ºC
Production of iron plateswith water-cooling plate-coilsfinished for 50m constructionunder 3NBT.
plate-coils19
Beam dumpBeam dump
MuMuPitPit
Iron block 660t
(DURATEC?)
Cu Core230t
DecayVolume
100
50
0
Cooled at r=170cm by 30℃ water
162℃ at maximum
For 0.75MW beam
For 4MW beam:Aluminum core?
beam
Concreteshield
20
Near Detectors Near Detectors
0
200
400
600
800
1000
1200
1400
1600
1800
x 10 3
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Eν (GeV)
1.5km
295km(SK)
280m
Neutrino spectra at diff. dist.
p π ν
140m0m 280m 2 km 295 km
on-axis
off-axis
Muon monitors @140m (dump)Fast (spill-by-spill) monitoring of
beam direction / intensity
Near detector @280mNeutrino intensity/spectrum/direction
Second Near Detector @2kmAlmost same Eν spectrum as for SKnot approved yet
⇒Talk by Clark McGrew tomorrow 21
Far DetectorFar Detector1st stage 2nd stage
41.4
m
40m
48m58
m
Total 500mSuper-Kamiokande50kt water Cherenkov11,000 20inch PMT’s
Hyper-Kamiokande~1Mt water Cherenkov~200,000 photo-sensors
SK
~10kmHK
beam
23
Same Off axis anglefor SK and HK
⇒Talk by Shiozawa tomorrow
Construction scheduleConstruction schedule
04-0505-06
06-0707-08
Decay VolumeProton line
BuildingsOthers
Target stationin ’07~’08
Dump’07~’08
Near detector’07~’08
Half of decay volume
in ’04~’05
Proton linein ’05~’06
Buildingsin ’06~’07
Five years construction in 2004~2008Most heavy construction in last 2 years
24
BudgetBudget
•Civil const.:83.5•Instrumentation:76.1---------------------------•Normal cond. magnet:10.4•Super cond. magnet:33.3•Target, DV, dump:12.6•Cooling system:15.2•Detector & others:4.4
Unit: Oku(108) Yen ~ 1M$KEK ν: 159.6 Oku YenKEK others: 490.1 Oku YenJAERI: 864.7 Oku Yen Total: 1514.4 Oku Yen
Fiscal Year
0
20
40
60
80
100
120
140
160
180
2000 2001 2002 2003 2004 2005 2006 2007 2008
200
Now
25
SummarySummary
•Neutrino beam facility was approvedfor five years construction.
•Off axis(~2.5º) experiment with SK •100 times larger intensity than K2K•T2K collaboration started in 2003.•Design and R&D are on going.•Construction of decay volume is starting.•Start experiment in 2009