Microsoft PowerPoint NBI03.kobayashi.ppt
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1 Nov.7, 2003 Status of J-PARC J ν facility (introduction) Takashi Kobayashi (IPNS, KEK) 1
2 Next generation LBL experiments in Japan J-PARC-Kamioka neutrino project Super-K: 50 kton Water Cherenkov ~Mt Hyper Kamiokande Kamioka 1st Phase (x10 2 of K2K) νµ νx disappearance ν µ νe appearance NC measurement ν µ beam of ~1GeV 2nd Phase CPV proton decay JAERI (Tokai-mura) 0.75 MW 50 GeV PS 4MW 50GeV PS 2
3 Sensitivities in first phase(5yrs) Search for ν e appearance ν µ disappearance x20 excluded by reactor δ(sin 2 2θ 23 ) δ( m 23 2 ) OAB-2degree sin 2 2 θ µ e sin 2 ~0.5 θ 23 sin 2 2θ Sensitive sin 2 2θ 13 >0.006 (90%) sin 2 2θ 13 >0.018 (3σ) 13 True m 232 (ev 2 ) δ(sin 2 2θ)~0.01 in 5 years δ( m 2 ) ~< in 5 years w/ beam MC sim, & full SK det. sim. 3
4 CP sensitivity (3σ) ) in 2 nd phase JHF-HK CPV Sensitivity sin 2 2θ CHOOZ excluded sin 2 2θ 13 <0.12@ m 312 ~3x10-3 ev no BG 0.04 signal stat only 0.02 stat+2%syst. stat+5%syst. (signal+bg) stat only stat+10%syst. JHF 3σ discovery sinδ 3σ CP sensitivity : δ >20 o for sin 2 2θ 13 >0.01 with 2% syst. 4
5 Construction 2001~2007 JFY E(GeV) Int.(10 12 ppp) Rate(Hz) Power(kW) Japan-ProtonAceeleratorResearchComplex N JAERI@Tokai-mura (60km N.E. of KEK) (Approved in Dec.2000) J-PARC (formerly known as JHF) 400MeV Linac K2K GeV PS Pacific Ocean FD omplex facility Neutrino Beam Line To SK 50GeV PS (0.75MW) 5
6 J-PARC site & Salt farm 昔の塩田跡 September,
7 PH1 PD1 PH deg. b end PH3 PQ4A PV2 UH3 適当な広さ μ ピット 1 鉄置場 サブトンネル D シャッター 放射化物保管室 μ ピット μ ピット Neutrino beam facility Overview deg. bend PQ1 PQ5PQ2A PQ4B PV1 PQ3B PQ3A PQ2B PD2 Components 1% dump サブトンネル A 保安林伐採エリア 液体窒素タンク 冷凍機室 コンプレッサー室 カードル置場 電気室 電気ヤード WC 制御室出入管理 機械ヤード 低温棟 バッファタンク ND1 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 ( 小林隆 ) UV1 UV2 UQ1 UQ2 UD1 UQ3 UD2 UH1 UH2 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 :0.286ha UQ4 UQ5 SM1 電源棟 サブトンネル B SM2 ST1 ST2 ST3 ST4 (1% dump) NM1 5,800l/min( 低温設備 ) 980l/min( 磁石電源 ) WC Proton beam transport 4%slope 37.5m 4%slope サブトンネル C Normal conducting magnets Superconducting arc Proton beam monitors 電源ヤード DQ1 DD1 Horn1 ND2 DQ2 DD2 ~4,500l/min( 磁石汚染 ) トンネル空調 TS 換気 NM2 電源室 ヤード 冷却棟 DQ3 DQ4 DD3 電気室 DSV DSH Target Station Horn2 3NBT decay pipe μ ピット測定室 µ-pit 25, m 130m Target/Horn system Decay pipe (130m) cross w/ 3NBT Cover OA angle 2~3 deg. Beam dump muon monitors 2 near detectors (280m/~2km) (*)LBL GPS survey finished. Technical Design&Development (Status) Report Near detector 7
8 Specification Beam kinetic energy 50GeV T=0) Protons/pulse 3.3x10 14 Beam current 15µA Beam power 750kW Extraction Single turn fast extraction Micro structure 8bunches/9 RF buckets Bunch width 58ns (full width) Bunch spacing 598ns Spill width ~5µs Cycle 3.53 sec Proton beam emittance 6.1πmm.mrad # of normal cond. mags 20 # of supercond. mags 28 in 14 cryostats Physical acceptance 60πmm.mrad Beam loss(proton transport) 1W/m Curvature of arc 104.4m Decay pipe length (target-dump) 130m (from target) Distance to near detectors 280m/~2km Distance to SK ~295km Target-SK beam decline -1.25deg 8
9 Acceleration cycle When 50GeVfast abort available: 3.53s When fast abort not available: 4.1s 9
10 ν facility construction group T.Iwashita 1 S.Koike 5, N.Sato 5 Nakadaira 10 ~58 ~26 ~5 ~8 ~2 ~5 ~1 ~5 ~1 ~3 ~2 10
11 Special features of the J-PARC J ν facility Very high intensity (750kW), high peak power (~2.6MJ/5µs~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 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. 11
12 1.92 deg. bend 1.92 deg. bend Primary line 50GeV ring 0.5W/m PV2 PQ5 PH3 PQ4B PQ4A PV1 PQ3B Preparation section (ctrl ed loss by collimator) 0.75kW (0.1%) PQ3A PD2 PQ2B PQ2A PD1 PQ1 PH2 サスペンション型クレーン (20t x 2) PH1 ニュートリノ ビームライン Fast ext.(kicker, septum) 1.125kW (0.15%) ビーム振り下げ FH2 FV1 FV2 FQ3A FQ3B FQ4 FQ2B FQ2A FH1 FQ1 Final Focusing section 0.25kW (0.03%) 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 12
13 Combined Function T.Ogitsu, T.Nakamoto Coil configuration B x = Q*y/r B y = D + Q*x/r Merit : reduce # of components can increase # of (Q-)magnets. Smaller beam size 13
14 Off Axis Beam (ref.: BNL-E889 Proposal) Super-K. Osc. Prob.=sin 2 (1.27 m 2 L/E ν ) TargetHorns Decay Pipe Quasi Monochromatic Beam x2~3 intense than NBB Tuned at oscillation maximum Exp ed # of evts(1yr,22.5kt) ~4500 ν µ tot (OAB 2degree) ~3000 ν µ CC ν e contamination ~0.2% at ν µ peak θ osc.max. ν µ m 2 =3x10-3 ev 2 L=295km OA1 OA2 OA3 ~10 2 x (K2K) Expected spectrum (OAB2 ) 14
15 Target 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/ 3 H production) in Al vessel, wall cooloed Remote maintenace (open ceiling) 22m 33m 11m 40ton crane GL Concrete block Machine room Helium vessel Iron shield Service pit Storage for highly activated stuff Final focus Beam window Baffle Target/1st horn Iron shield 2nd horn 3rd horn Beam window Decay volume Built-in concrete 15
16 Decay pipe common for SK/HK Possible site for Hyper-K Beam eye DV center SK 2 HK SK ~10km Best ) Fit 3.43 (OAB2.3 Beam Axis) Decay pipe (OAB2 beam axis) 3.64 (OAB2.5 ) 4.16 (OAB3 ) HK 3 have to cover p/π beam axis -(3~4)deg corresponding to m 2 =2.2~3.2x10-3 ev 2 16
17 Decay volume & muon pit 3NBT Muon mon. (Eth~5GeV m 5.4m OA2 o OA3 o 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 Cooling simulation 17
18 2. Near 280m from target Under conceptual design process Grand Level 20mφ target position 36m HK 6.2m 3.7m 11m SK direction 6m beam center with 3 off-axis. 18
19 Civil construction schedule requested to MEXT Order is still uncertain Five year plan Most heavy construction comes last 2 years 19
20 Recent events Mar. 6, 2003: Informal topical technical review on combined function (CF) magnet Conclusion: Go ahead w/ CF scheme Mar., 2003: 2 nd J-PARC International Advisory Committee Should start neutrino as soon as possible Mar. 22,2003: J-PARC Nuclear & Particle Facility committee May 2003 Jun. 2003: High priority on neutrino Technical review on neutrino beam line recommended International collaboration for experiment formed (Spokesperson: K.Nishikawa) Budget request submitted to Monka-sho (MEXT) 5 year plan Aug.2003: The request went out to MOF Oct.2003: CSTP (council for science & technology policy) cabinet office (Chair: prime minister) rated J-PARCν at lowest rank Nov.7,2003: 1 st review committee meeting to re-evaluate J-PARC project. Nov.12,13,2003: J-PARC ν technical advisory committee End of Dec.: Final answer of approval comes from MOF 20
21 Summary 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 experiment at the beginning of 2009 at the beginning of 2009 (of course, aiming to be approved before that ) 21
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