Neutrino beam line. Yoshikazu Yamada (KEK) Contents. Talk at Neutrino Super Beams, Detectors and Proton Decay BNL, March 3, 2004

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1 Neutrino beam line at J-PARCJ Contents Yoshikazu Yamada (KEK) Talk at Neutrino Super Beams, Detectors and Proton Decay BNL, March 3, 2004 Introduction Proton beam line Target & neutrino beam Neutrino Detector Schedule and budget Summary

2 T2K project ~1GeV ν µ beam ( 100 of K2K) J-PARC(Tokai) 0.75 MW 50 GeV PS 4 MW? Kamioka Super-K: 50 kton Water Cherenkov x20 excluded by CHOOZ Hyper-K? 2 νµ νx disappearance νµ νe appearance NC measurement sin 2 2θ 13 >0.006(90%) sin 2 2θ 13 from ν e appearance T2K(Tokai To Kamioka) collaboration started

3 PQ1 PH1 PD1 PH deg. bend 1.92 deg. bend PH3 PQ4A PV2 U D 1 U Q 3 U Q 5 U H 2 U H 3 W C 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 PQ5PQ2A PQ3APQ2B PQ4B PV1 PQ3B PD2 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 W C 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T P+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 ) U V 1 U V 2 U Q 1 U Q 2 U D 2 U H 1 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 U Q 4 SM 1 電源棟サブトンネルB SM 2 ST1 ST2 ST 3 ST4 N M 1 Approved in Dec for 5 years construction 5,800l/min( 低温設備 ) 980l/min( 磁石電源 ) 適当な広さ 4%slope 37.5m 4%slope サブトンネルC Components Primary proton beam line arc section (super-conducting) μピット測定室電源ヤード電気室 ND2 DSV DSH DQ1 DQ2 DQ3 DQ4 Target 電源室 DD1 DD2 DD3 Horn1 Horn2 ~4,500l/m in( 磁石汚染 ) トンネル空調 TS 換気 Station NM2 ヤード冷却棟 ,000 Decay volume 280m 130m straight sec. (normal-conducting) Target/Horn system Decay volume (130m) Beam dump Muon monitors Near neutrino detector (280m) Second near neutrino detector 3 (~2km): not approved yet Dump & µ-monitor Near detector

4 FH1FQ1 PC deg. bend 1.92 deg. bend Proton beam line サスペンション型クレーン(20t x 2) 引き出し基準点 x= , y= PQ5 PH3 PC3 PQ4 PV2 PC2 PC1 PQ3 PV1 PD2 PD1 PQ2A PQ1 PH2 PH1 Preparation ニュートリノビームライン section Normal conducting magnets Specification (50GeV) Single turn fast extraction 4 FH2 FQ2 FV2 FQ3 FV1 FQ4 FV2 Arc Section 84.5 o, R=105m, Super conducting magnets Final Focusing Section Normal conducting magnets 8 bunches/~5µs 3.3x10 14 protons/spill Cycle: 3.64 second ε=6π mm.mr, p/p=0.31% (ε=7.5π mm.mr,

5 PC deg. bend 1.92 deg. bend Beam Loss 50GeV ring 0.5W/m PQ5 PH3 PC3 PQ4 PV2 PC2 PC1 PQ3 PV1 PD2 PD1 PQ2A PQ1 PH2 サスペンション型クレーン(20t x 2) PH1 引き出し基準点 x= , y= ニュートリノビームライン Preparation section 0.75kW (0.1%) controlled by collimators Fast extraction (kicker, septum) 1.1kW (0.15%) FH1FQ1 Assumed by HAND Arc Section 1W/m to assure hands-on maintenance and below quench limit Shielding design based on assumption Same order as KEK-PS beam line ~10 2 relative suppression required げ FH2 FQ2 FQ3 FV1 FQ4 FV2 Final Focusing section 0.25kW (0.03%) 5

6 Preparation section Matching beam from PS to ARC section beam Top view Collimators to minimize beam loss & heat load at super-conducting magnets Dipole(H):2 Quadrupole:5 Steering:5 5 with MIC Acceptance: 6 60π mm.mr Preparation section beam Monitors horizontal vertical collimator Arc section ~1cm ε=6πmm.mr

7 Arc section monitors 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 7

8 Combined function Combined function magnets to save space and cost First application for super-conducting magnet Dipole OR Quadrupole 8 Combined function Dipole Field: T Quad. Field: T/m Inductance: 14mH Magnetic Length: 3.3m Current: 7345A Stored Energy: 0.38MJ

9 R&D for magnet Cryogenic Science Center of KEK Trial Yoke Pack & Plastic Collar 9 Trial winding of coil at KEK

10 Final focusing section Bending/focusing beam to target Side view Arc section 6πmm.mr Vertical dipole magnets to change off-axis angle (2º~3º) Final focusing section σ r ~6mm at target Monitors horizontal vertical Dipole(V):2 Quadrupole:4 Steering:2 10

11 Beam monitors ν-beam Target TS FF C,P C,P C,P C,P Arc C,P I,C,P I,P C, P C, P C, P I,C,P C,P P C,P Beam Monitor I : Intensity (CT) C: Center position (LPM) P: Profile (SSEC/RGBPM) Loss monitor C,P P P PS C,P I,C,P 11

12 Off Axis Beam Target 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 ν µ CC(~x100 of K2K) 12 (ref.: BNL-E889 Proposal) Horns Decay volume ν e ~ 0.2% at ν µ peak θ SK E ν 2 2 Eν 1 θ=0 mπ mµ = θ=3.0 2( E π θ=1.0 θ=2.0 pπ cosθ ) 0 5 Eπ Osc. Prob.=sin 2 (1.27 m 2 L/E ν ) osc.max. ν µ m 2 =3x10-3 ev 2 L=295km OA1 OA2 OA3 Eν

13 Target station 22m 33m 40 ton crane 11m Service pit Ground level 22m Concrete blocks Machine room Helium container Iron shield Final focus Beam window Iron shield Decay volume Baffle Concrete structure Storage for Target & 1st horn 2nd horn 3rd horn radioactive material 13

14 Target Carbon Graphite target: 30mm(D)x900mm(L) protons in a year Energy deposit: 58kJ/spill Cooled at outer surface P/spill σ r =6mm beam structure 3.53s 598ns 5µs ( o C) C1 Water cooling C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 中心軸最高温度部外表面最高温度部 ( o 300 C) 温度 ( ) 150 Max o C 100 at surface Max. 236 o C at center 58ns 中心軸最高温度部外表面最高温度部経過時間 (sec) 0 5 (sec.) 経過時間 (sec) (sec.) 図クラファイトターケットの温度変化 (C12 初期 )

15 Cooling of target container(?) Coolant flow beam Graphite target Two scenarios Water cooling Required thermal transfer (6kW/m 2 K) was achieved in test setup. Shrink in container due to radiation damage may be a problem. irradiation test at BNL Helium gas cooling No container for graphite Entrance window required Under discussion ~700ºC@center 500ºC@surface Helium cooling

16 Horn system beam Target Converge secondary pions into decay volume 3 horn system Carbon target in 1 st horn Made by Aluminum 320kA pulse current Water cooled inside Under design and R&D cm 1st Horn 2nd Horn 3rd Horn x OAB 0.0deg Perfect horn (accept. 180º) T2K horn (GeV/c) Eν (GeV)

17 R&D for horn Thermal analysis 82ºC at maximum Test of Friction Stir Welding FSW Cooled by water mist HITACHI, Ltd. Temp.(ºC) 温度 ( ) 時間 (s) Time (second) 図温度解析結果 / 内部導体最高温度部の温度履歴 Test of water mist Pulsed load Test 1.1x10 7 repetition No damage by repetition fatigue was found. 17

18 Decay volume 3NBT (BT between 3GeV&MLF) constructed in m under 3NBT will be constructed in 2004 Target Station ~15m Off axis angle : 2º~3º Decay Volume ~110m 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 Dump ~10m OA2 o OA3 o Surrounded by 6m thick concrete 18

19 Cooling of DV DV should work with 4MW beam FEM analysis for 4MW beam Iron plate <60ºC Concrete <120ºC Production of iron plates with water-cooling plate-coils finished for 50m construction under 3NBT. 19 plate-coils

20 Beam dump Cu Core 230t Cooled at r=170cm by 30 water 162 at maximum beam Decay Volume Mu Pit For 0.75MW beam For 4MW beam: Concrete shield Iron block 660t (DURATEC?) Aluminum core? 20

21 Talk by Clark McGrew tomorrow 21 Near Detectors p π ν off-axis on-axis 0m 140m 280m 2 km 295 km Muon (dump) Fast (spill-by-spill) monitoring of beam direction / intensity Near Neutrino intensity/spectrum/direction Second Near Almost same E ν spectrum as for SK not approved yet Neutrino spectra at diff. dist. x km 295km(SK) 280m Eν (GeV)

22 Far Detector 1 st stage 2 nd stage 41.4m 40m Super-Kamiokande 50kt water Cherenkov 11,000 20inch PMT s beam ~10km SK HK 58m 48m Total 500m Hyper-Kamiokande ~1Mt water Cherenkov ~200,000 photo-sensors Same Off axis angle for SK and HK Talk by Shiozawa tomorrow 23

23 Construction schedule Near detector 07~ 08 Dump 07~ 08 Target station in 07~ 08 Proton line in 05~ Decay Volume Proton line Buildings Others Half of decay volume in 04~ 05 Buildings in 06~ 07 Five years construction in 2004~2008 Most heavy construction in last 2 years 24

24 Budget KEK ν: Oku Yen KEK others: Oku Yen JAERI: Oku Yen Total: Oku Yen Now Unit: Oku(10 8 )Yen ~ 1M$ Civil const.:83.5 Instrumentation: Normal cond. magnet:10.4 Super cond. magnet:33.3 Target, DV, dump:12.6 Cooling system:15.2 Detector & others: Fiscal Year 25

25 Summary Neutrino beam facility was approved for five years construction. Off axis(~2.5º) experiment with SK 100 times larger intensity than K2K T2K collaboration started in Design and R&D are on going. Construction of decay volume is starting. Start experiment in 2009

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