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