NBI03@KEK
Nov.7, 2003

Status of J-PARC ν facility(introduction)
Takashi Kobayashi(IPNS, KEK)

T.Kobayashi (KEK)

NBI2003

Nov. 7-11, 2003

1

Next generation LBL experiments in Japan“J-PARC-Kamioka neutrino project”

Super-K: 50 kton
Water Cherenkov

Kamiokaνµ beam of ~1GeV
JAERI(Tokai-mura)
0.75 MW 50 GeV PS~Mt “HyperKamiokande”

4MW 50GeV PS

1st Phase (x102 of K2K)zνµ→ νx disappearancezνµ→ νe appearancezNC measurement
T.Kobayashi (KEK)

NBI2003

2nd PhasezCPVzproton decay
Nov. 7-11, 20032Sensitivities in first phase(5yrs)
Search for νe appearancex20

sin 2θ µe ≡ sin θ 23 ⋅ sin 2θ13222~0.5

Sensitive sin22θ13>0.006 (90%)
sin22θ13>0.018 (3σ)
T.Kobayashi (KEK)δ(sin22θ23)
δ(∆m232 )excludedby reactor

νµ disappearance

0.01
OAB-2degree
1×10-4
True ∆m232 (eV2)δ(sin22θ)~0.01 in 5 yearsδ(∆m2) ~<1×10-4 in 5 years

w/ beam MC sim, &Nov.
full7-11,
SK2003det. sim.
NBI20033

CP sensitivity (3σ) in 2nd phase2sin 2θ13JHF-HK CPV Sensitivity
CHOOZ excluded
sin22θ13<0.12@∆m312~3x10-3eV2

0.14
0.12
0.1

stat+5%syst.

stat+2%syst.
0.08(signal+BG) stat only
0.06

stat+10%syst.

no BG
0.04
signal stat only
0.02
00

JHF 3σ discovery

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1sinδ

3σ CP sensitivity : |δ|>20o for sin22θ13>0.01 with 2% syst.
T.Kobayashi (KEK)

NBI2003

Nov. 7-11, 2003

4

Japan-ProtonAceeleratorResearchComplex facility(formerly known as JHF)

N

Pacific Ocean

JAERI@Tokai-mura(60km N.E. of KEK)

Neutrino Beam Line

Construction
2001～2007 JFY
400MeV Linac50(0. GeV
75MW PS)(Approved in Dec.2000)

3GeV PS

FDJ-PARC
E(GeV)
50Int.(1012ppp)
330
Rate(Hz)
0.275
Power(kW)750
T.Kobayashi (KEK)

K2K

To SK

1260.45
5.2
NBI2003

Nov. 7-11, 2003

5

J-PARC site & Salt farm

昔の塩田跡

September, 2003
T.Kobayashi (KEK)

NBI2003

Nov. 7-11, 2003

6

Neutrino beam facility Overview
1% dump

Components

PQ1
PQ2B

PH3
PQ5 PV2

PQ4B

PV1

PQ4A

PQ3B

PQ3A

PQ2APD1

1.9 2deg. bend

PH2PH1PD2

1.92 deg. bend

Aサブトンネル

保安林伐
ド

電気室

¾(1% dump)

室

電気ヤー

制御

WC
出入管
理UV1UV2

SM1UQ2ST 2UQ4棟
SM2U Q5

ST3ＮＤ１UH3建屋壁
伐採 面より５ ｍ離れ面積計たところ：０．2まで保86ｈａ

安林伐採。

ST4

バッファタ

場

機械ヤー
ドンク

カードル置

コンプ
レッサ

ー室

冷凍液体窒素低温棟¾Proton beam transport

輸送
道路レベルT
土盛り
P+9.3
上面はｍへ。

TP+1
ニュー
0.8ｍ保
トリノ建存する屋を輸離れるため法送道路方向へ面発生
５ｍ移（０２０側へ３動。
２０７小。
ｍ、８間林隆道路か）
ら

UH2

UQ3電源
ST1UH1機室

Bタンク

サブトンネル

採エリ
ア

U D1
U D2

UQ1

NM15,800l/min
980 l/mi (低温設備)
n(磁石電源)適当

37.5m
4%slopeNormal conducting magnets

CW な広さ

4%slope
ブ
サトン

Cルネ

電気室

電源ヤード

ＮＤ２
DQ3 DQ4

シャッ ターDSV DSHDQ1 DQ2

電源室
DD1 DD2

Superconducting arc

DD3

サブトンネルD~ 4,500l/min(磁石汚染)
トンネル空調
TS換気

NM2
ヤード

¾Proton beam monitors

冷却棟
放射化物保管室

3NBT

5.6

3.0
5.6

4.6

3.0
4.6

decay pipe

13.5

3. 50

1. 50 1.5 0

4.0 0

1 .50

7.0

2.00

2 .00

8.00

4.5
5.0

5.0 5.0μピット
測定室

15.0

μピット２

280m

μピット１2 .50

2 .50

3.50

3. 00

¾muon monitors

3.5¾Beam dump

3.0
3.6 2.4

2.4 3.6

μピット1鉄置場

30.0

Cover OA angle 2~3 deg.

6.6

130.0

¾Decay pipe (130m) cross w/ 3NBT

3.0
6.6
20.0

130m

60.0

¾Target/Horn system

TargetStation

Horn2

Horn1

25,000µ-pit¾2 near detectors (280m/~2km)(*)LBL GPS survey finished.
Technical Design&Development (Status) Report
http://jnusrv01.kek.jp/jnu/nu-TAC/T.Kobayashi (KEK)

NBI2003

Near detectorNov. 7-11, 2003

7Specification
Beam kinetic energy
Protons/pulse
Beam current
Beam powerExtraction
Micro structure
Bunch width
Bunch spacing
Spill width
Cycle
Proton beam emittance# of normal cond. mags
# of supercond. mags
Physical acceptanceBeam loss(proton transport)
Curvature of arc
Decay pipe length (target-dump)
Distance to near detectors
Distance to SK
Target-SK beam decline
T.Kobayashi (KEK)

NBI2003

50GeV (40GeV @ T=0)
3.3x1014
15µA
750kW
Single turn fast extraction
8bunches/9 RF buckets
58ns (full width)598ns~5µs3.53 sec
6.1πmm.mrad
2028 in 14 cryostats
60πmm.mrad
1W/m
104.4m
130m (from target)
280m/~2km~295km-1.25deg
Nov. 7-11, 2003

8Acceleration cycle

When 50GeVfast abort available: 3.53s
When fast abort not available: 4.1s
T.Kobayashi (KEK)

NBI2003

Nov. 7-11, 20039“ν facility construction group”
T.Iwashita1S.Koike5, N.Sato5~58

Nakadaira10~26~5~8~2~5~1~5~1~3~2T.Kobayashi (KEK)

NBI2003

Nov. 7-11, 2003

10

Special features of the J-PARC ν facility• Very high intensity (750kW), high peak power(~2.6MJ/5µs~500GW)– Cooling: beam window, target, horn, target station wall, decay pipewall, beam dump!!
– Shock wave: target, horn, beam window– Radiation• Very thick shielding• Remote maintenance• Superconducting (SC) proton transport– small curvature, power consumption (cheaper operation)– Small beam loss required.

• (SC) combined function (CF) magnets (New!)– Less number of magnets, less cost, and larger acceptance• “Off-axis” (OA) beam
– Low energy, high intensity, tunable narrow band beam.
T.Kobayashi (KEK)

NBI2003

Nov. 7-11, 2003

11

Primary line

ン型
サスペンショt x 2)クレーン(20PQ2B

50GeV ring
0.5W/mPV2

PQ5PH3PQ4B

PQ4A

PV1 PQ3B

PQ3A

PD2

PQ2A

PQ1
PD1
1.92 deg. bend

PH2

PH1

1.92 deg. bend

ニュートリノ・ビームライン

Preparation section(ctrl’ed loss by collimator)
0.75kW (0.1%)

Fast ext.(kicker, septum)
1.125kW (0.15%)• 20 normal conducting magnets(prep.&FF sect.) 5 MIC mags.
– Very high radiation environment

FQ2B

FQ2A

FH1

FQ1

Final Focusing section
0.25kW (0.03%)

FH2

FQ3A
FQ3B
FQ4
FV1

ビーム振り下げ• 28 Superconducting CF magnets• Proton monitors– CT for intensity– Loop pickup monitor (center)– SSEC/RGBPM for profile– Loss monitor• Vacuum system– window

FV2

T.Kobayashi (KEK)

NBI2003

Nov. 7-11, 2003

12

Combined Function
Coilconfiguration

T.Ogitsu,
T.Nakamoto

Bx = Q*y/r
By = D + Q*x/r

Merit : reduce # of components
can increase # of (Q-)magnets.
T.Kobayashi (KEK)

NBI2003

Smaller beam sizeNov. 7-11, 2003

13

Off Axis Beam(ref.: BNL-E889 Proposal)
Decay Pipeθ

osc.max.

TargetHorns

Super-K.

Osc. Prob.=sin2(1.27∆m2L/Eν)Quasi Monochromatic Beam
x2~3 intense than NBB∆m2=3x10-3eV2
L=295kmνµOA1°OA2°
OA3°

Tuned at oscillation maximum
Exp’ed # of evts(1yr,22.5kt)~4500 νµ tot(OAB 2degree)~3000 νµ CC

νe contamination ~0.2% at νµ peak

Expected spectrum(OAB2°)~102 x (K2K)
T.Kobayashi (KEK)

NBI2003

Nov. 7-11, 2003

14

Target area•••••

Baffle (protect horn from mis-steering
Target (water cooled graphite)~3cmφx90cm, 60kJ/pulse : cooling
testing
3xHorn (320kA). Conceptual design finishedHe filled (reduce NOx/3H production) in Al vessel, wall cooloed
Remote maintenace (open ceiling)
33m

22m

40ton crane

11m

GLConcrete block
Service pit

Helium vessel
Iron shield

Storage for highly
activated stuff

Machine room

Final focus

Iron shield
Decay volume

Beam window
BaffleTarget/1st horn

T.Kobayashi (KEK)

Beam window

NBI2003

Built-in concrete
2nd horn

3rd horn

Nov. 7-11, 2003

15Decay pipe common for SK/HK

Beam eyePossible site for Hyper-K

DV center

0.784°

3°

SK2°

3°

2°
HK

0.02°

SK

1.51°

3.11°(OAB2° beam axis)
3.64°(OAB2.5°)
4.16°(OAB3°)

Best )Fit 3.43°(OAB2.3° Beam Axis)~10km

Decay pipe

HK2°

3°

have to cover p/π beam axis -(3~4)deg
corresponding to ∆m2=2.2~3.2x10-3eV2T.Kobayashi (KEK)

NBI2003

Nov. 7-11, 2003

16

Decay volume & muon pit
3NBT

Muon mon.
(Eth~5GeV

2004
5.4m

OA2oOA3o130m•••••

Accommodate OA angle 2~3deg, common for
SK/HK
Shielding design finished. ~6m thick concrete
Civil engineering design finishedEngineering design for water cooling finished.
Boundary condition: Inner iron vessel:∆T<30deg, concrete <100deg
He vessel inside concrete shielid– Water cooled– Iron parts for 30m part made last year
– Iron parts for 41.4m part will be made this year
T.Kobayashi (KEK)

NBI2003

Cooling simulation
Nov. 7-11, 2003

17

2. Near detector @ 280m from target
Under conceptual design process

20mφGrand Level11mtarget position

6.2mHK

3.7m

SK direction36mbeam center with 3° off-axis.
6mT.Kobayashi (KEK)

NBI2003

Nov. 7-11, 2003

18

Civil construction schedule requested to MEXT
Order is still uncertain

0 4-050 5 -0 60 6-07
0 7-0 8• Five year plan
• Most heavy construction comes last 2 years
T.Kobayashi (KEK)

NBI2003

Nov. 7-11, 2003

19

Recent events• Mar. 6, 2003: Informal topical “technical review” on combined function(CF) magnet
Conclusion: Go ahead w/ CF scheme• Mar., 2003：
2003 2nd J-PARC International Advisory Committee
Should start neutrino as soon as possible• Mar. 22,2003:
22,2003 J-PARC Nuclear & Particle Facility committee
High priority on neutrino
Technical review on neutrino beam line recommended• May 2003

International collaboration for experiment formed(Spokesperson: K.Nishikawa)• Jun. 2003:
2003 Budget request submitted to Monka-sho (MEXT)
5 year plan••

Aug.2003:
Aug.2003 The request went out to MOF
Oct.2003:
Oct.2003 CSTP (council for science & technology policy) cabinet
office (Chair: prime minister) rated J-PARCν at lowestrank• Nov.7,2003:
Nov.7,2003 1st review committee meeting to re-evaluate J-PARCproject….
• Nov.12,13,2003:
Nov.12,13,2003 J-PARC ν technical advisory committee• End of Dec.: Final answer of approval comes from MOF
T.Kobayashi (KEK)

NBI2003

Nov. 7-11, 2003

20

Summary• J-PARC ν facility features;– High intensity & peak power Æ radiation/shock– Superconducting combined function magnets– Off-axis beam

• Design & R&D work intensively going– (as you will hear)• Aiming to start experimentat the beginning of 2009
– (of course, aiming to be approved before that…)

T.Kobayashi (KEK)

NBI2003

Nov. 7-11, 2003

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