status of j-parc facility (introduction) · 2003. 12. 3. · t.kobayashi (kek) nbi2003 nov. 7-11,...

Nov. 7-11, 2003NBI2003 1T.Kobayashi (KEK)

Status of JStatus of J--PARC PARC νν facilityfacility(introduction)(introduction)

Takashi Kobayashi(IPNS, KEK)

[email protected], 2003


Next generation LBL experiments in JapanNext generation LBL experiments in Japan““JJ--PARCPARC--KamiokaKamioka neutrino projectneutrino project””

νµ beam of ~1GeVKamioka

JAERI(Tokai-mura)

ννµµ→→ ννxx disappearanceννµµ→→ ννee appearanceNC measurement

0.75 MW 50 GeV PS

Super-K: 50 ktonWater Cherenkov

~Mt “Hyper Kamiokande”

4MW 50GeV PS

CPVproton decay

1st Phase (x102 of K2K)2nd Phase


Sensitivities in first phase(5yrs)Sensitivities in first phase(5yrs)

δ(si

n2 2θ 2

3)δ(

∆m23

2)

0.01

1×10-4

True ∆m232 (eV2)

δ(sin22θ)~0.01 in 5 yearsδ(∆m2) ~<1×10-4 in 5 years

OAB-2degree

Search for νe appearance νµ disappearance

excludedby reactor

132

2322 2sinsin2sin θθθµ ⋅≡e

~0.5Sensitive sin22θ13>0.006 (90%)

sin22θ13>0.018 (3σ)w/ beam MC sim, & full SK det. sim.

x20


JHF-HK CPV Sensitivity

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1sinδ

sin2 2θ

13

no BGsignal stat only

(signal+BG) stat only

stat+2%syst.stat+5%syst.

stat+10%syst.

CHOOZ excludedsin22θ13<0.12@∆m31

2~3x10-3eV2

JHF 3σ discovery

3σ CP sensitivity : |δ|>20o for sin22θ13>0.01 with 2% syst.

CP sensitivity (3CP sensitivity (3σσ) in 2) in 2ndnd phase phase


400MeV Linac

3GeV PS

50Ge

V PS

(0.7

5MW

)

N

FD

Neutrino Beam Line

To SK

Construction2001～2007 JFY

5.2750Power(kW)

0.450.275Rate(Hz)

6330Int.(1012ppp)

1250E(GeV)

K2KJ-PARC

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

(Approved in Dec.2000)

Pacific Ocean

JJapanapan--PProtonrotonAAceeleratorceeleratorRResearchesearchCComplexomplex facilityfacility(formerly known as JHF)


JJ--PARC site & Salt farmPARC site & Salt farm

昔の塩田跡

September, 2003


PV2PQ5

PQ2A

PQ4A

PH3 PQ4BPQ3B

PV1PD21.92 deg. bend

PQ3APQ2B PH1

1.9 2 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

NM1低温棟

5,800l/min(低温設備)　980l/min(磁石電源)

NM2

ヤード

~4,500l/min(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

DQ2

DD2

Horn1

DD1

DQ1

DD3

DQ3 DQ4

Horn2

電源室

シャ

ッタ

ー

電気室

DSV DSH

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：０．286ｈａSM1 ST1

SM2ST2

ST3 ST4

UD1

UQ3

UQ1 UQ2

UV1 UV2

UH3

UH2

UQ4電源棟UQ5

UD2 UH1

制御室

出入管理

WC

WC

適当

な広

さ

37.5

m4%

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 1.5 0

2.00

3. 50

60.0

130.0

25,000

decay pipe

Near detector

TargetStation

µ-pit280m

130m

3NBT

Neutrino beam facility OverviewNeutrino beam facility Overview

(1% dump)Proton beam transport

Normal conducting magnetsSuperconducting arc

Proton beam monitors Target/Horn systemDecay pipe (130m) cross w/ 3NBT

Cover OA angle 2~3 deg. Beam dumpmuon monitors2 near detectors (280m/~2km)

(*)LBL GPS survey finished.

Components

Technical Design&Development (Status) Reporthttp://jnusrv01.kek.jp/jnu/nu-TAC/

1% dump


Beam kinetic energy 50GeV (40GeV @ T=0)Protons/pulse 3.3x1014

Beam current 15µABeam power 750kW

Extraction Single turn fast extractionMicro structure 8bunches/9 RF buckets

Bunch width 58ns (full width)Bunch spacing 598ns

Spill width ~5µsCycle 3.53 sec

Proton beam emittance 6.1πmm.mrad# of normal cond. mags 20

# of supercond. mags 28 in 14 cryostatsPhysical acceptance 60πmm.mrad

Beam loss(proton transport) 1W/mCurvature of arc 104.4m

Decay pipe length (target-dump) 130m (from target)Distance to near detectors 280m/~2km

Distance to SK ~295kmTarget-SK beam decline -1.25deg

SpecificationSpecification


When 50GeVfast abort available: 3.53s

When fast abort not available: 4.1s

Acceleration cycleAcceleration cycle


““νν facility construction groupfacility construction group””

~26~5~8~2~5~1~5~1~3~2

S.Koike5, N.Sato5

T.Iwashita1

Nakadaira10 ~58


Special features of the JSpecial features of the J--PARC PARC νν facilityfacility•• Very high intensity (750kW), high peak power Very high intensity (750kW), high peak power

(~2.6MJ/5(~2.6MJ/5µµs~500GW)s~500GW)– Cooling: beam window, target, horn, target station wall, decay pipe

wall, beam dump!!– Shock wave: target, horn, beam window– Radiation

• Very thick shielding• Remote maintenance

•• Superconducting (SC) proton transportSuperconducting (SC) proton transport– small curvature, power consumption (cheaper operation)– Small beam loss required.

•• (SC) combined function (CF) magnets (New!)(SC) combined function (CF) magnets (New!)– Less number of magnets, less cost, and larger acceptance

•• ““OffOff--axisaxis”” (OA) beam(OA) beam– Low energy, high intensity, tunable narrow band beam.


FQ4

FQ3B

FQ3A

FH2

FV2

FV1

ビーム振り下げ

FQ2 B

F Q2 A

FH1

FQ1

PQ4BPH3

PV2PQ5

PV1 PQ3BPQ4A 1.92 deg. bend

PQ2B

PD2PQ3APD1

PQ1

1.92 deg. bend

PQ2A

ニュートリノ・ビームライン

PH1PH2

サスペンション型

クレーン(20t x 2)

Fast ext.(kicker, septum)1.125kW (0.15%)

Preparation section(ctrl’ed loss by collimator)

0.75kW (0.1%)

50GeV ring0.5W/m

Final Focusing section0.25kW (0.03%)

Primary linePrimary line

• 20 normal conducting magnets (prep.&FF sect.) 5 MIC mags.– Very high radiation environment

• 28 Superconducting CF magnets• Proton monitors

– CT for intensity– Loop pickup monitor (center)– SSEC/RGBPM for profile– Loss monitor

• Vacuum system– window


Merit : reduce # of components

can increase # of (Q-)magnets. Smaller beam size

Coil configuration Bx = Q*y/r

By = D + Q*x/r

T.Ogitsu,

T.NakamotoCombined FunctionCombined Function


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

θTargetHorns Decay Pipe

Super-K.

Quasi Monochromatic Beamx2~3 intense than NBB

Exp’ed # of evts(1yr,22.5kt)~4500 νµ tot ~3000 νµ CC νe contamination ~0.2% at νµ peak

Expected spectrum(OAB2°)~102 x (K2K)

νµOA3°OA2°OA1°

Osc. Prob.=sin2(1.27∆m2L/Eν)

∆m2=3x10-3eV2

L=295km

Tuned at oscillation maximum

(OAB 2degree)

osc.

max

.


Target areaTarget area• Baffle (protect horn from mis-steering• Target (water cooled graphite)~3cmφx90cm, 60kJ/pulse : cooling

testing• 3xHorn (320kA). Conceptual design finished• He filled (reduce NOx/3H production) in Al vessel, wall cooloed• Remote maintenace (open ceiling)

Iron shield

Helium vessel

Machine room

Service pit

Sto

rage fo

r hig

hly

activ

ate

d s

tuff

Iron shield

Concrete block

Target/1st horn

Beam window

2nd horn 3rd horn

Final focus

Decay volume

Built-in concrete

Beam window

Baffle

22m 33m

11m40ton crane

GL


SKHK

3°

2°

3°

2°

DV center

)

3°

2°

1.51°0.02°

°0.784

Decay pipe common for SK/HKDecay pipe common for SK/HK

have to cover p/π beam axis -(3~4)degcorresponding to ∆m2=2.2~3.2x10-3eV2

Beam eye

SK

~10km

HK

Possible site for Hyper-K

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

Best Fit 3.43°(OAB2.3° Beam Axis)

Decay pipe


• Accommodate OA angle 2~3deg, common for SK/HK

• Shielding design finished. ~6m thick concrete• Civil engineering design finished• Engineering 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

3NBT

130m

5.4mOA2o

OA3o

Cooling simulation

Decay volume & Decay volume & muonmuon pitpitMuon mon.(Eth~5GeV

2004


2. Near detector @ 280m from target2. Near detector @ 280m from target

20mφ

36m

SK direction

beam center with 3° off-axis.6m

Grand Level

target position11m

3.7m

6.2mHK

Under conceptual design process


Civil construction schedule requested to MEXTCivil construction schedule requested to MEXT

04-0505-06

06-0707-08

• Five year plan• Most heavy construction comes last 2 years

Order is still uncertain


Recent eventsRecent events•• Mar. 6, 2003: Mar. 6, 2003: Informal topical “technical review” on combined function

(CF) magnetConclusion: Go ahead w/ CF scheme

•• MarMar.,., 20032003： 2nd J-PARC International Advisory CommitteeShould start neutrino as soon as possible

•• Mar. 22,2003Mar. 22,2003: J-PARC Nuclear & Particle Facility committeeHigh priority on neutrino

Technical review on neutrino beam line recommended•• May 2003May 2003 International collaboration for experiment formed

(Spokesperson: K.Nishikawa)•• Jun. 2003Jun. 2003: Budget request submitted to Monka-sho (MEXT)

5 year plan•• Aug.2003Aug.2003: The request went out to MOF•• Oct.2003Oct.2003: CSTP (council for science & technology policy) cabinet

office (Chair: prime minister) rated J-PARCν at lowest rank

•• Nov.7,2003Nov.7,2003: 1st review committee meeting to re-evaluate J-PARC project….

•• Nov.12,13,2003Nov.12,13,2003: J-PARC ν technical advisory committee•• End of Dec.:End of Dec.: Final answer of approval comes from MOF


SummarySummary

• J-PARC ν facility features;– High intensity & peak power 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 2009at the beginning of 2009

– (of course, aiming to be approved before that…)

status of j-parc facility (introduction) · 2003. 12. 3. · t.kobayashi (kek) nbi2003 nov. 7-11,...

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