JHF Horn construction status and K2K horn experience YAMANOI Yutaka - PowerPoint PPT Presentation

JHF Horn construction status and K2K horn experience YAMANOI Yutaka (KEK) K2K Horn system • The operation result of K2K Horns • – Trivial troubles (2002-2003) • Status of JHF Horns • Basic parameters Mechanism and Merit of FSW – Concrete stuffing strip line – – The pulse currents test by the power supply of K2K Horn Schedule • Summary •

K2K Horn system Target & First HORN Second HORN Beam 1.05 ° Built-in production target ( φ 30mm) • • (Blue) Removable train: -A distance between horns is about 8.06 m. • (Green) Adjustment table: -decline to Super-Kamiokande with 1.05 ° -Accuracy is equal to about 0.04 mrad. • Operation current 250k Amp at both horns • High pulsed current 2.5ms width, 2.18s cycle Pulse Current • Total Joule’s heat= 7740 kcal/h

The operation result of K2K Horns 14.E+06 第１－７号機 1st Horn 第２ー３号機 12.E+06 2nd Horn 10.E+06 08.E+06 Now 第２－２号機 Run2000 Run200 1 -02 06.E+06 第２－１号機 第１－４号機 第１－８号機 Run 1 999 φ３０ 第２－４号機 第１－３号機 04.E+06 φ２５ 第１－５号機φ２５ 第１－２号機 Run2002-03 φ２０ 02.E+06 第１－６号機 par a b 第１－８号機 cap 00.E+00 '99/01 '99/03 '99/05 '99/07 '99/09 '99/11 '00/01 '00/03 '00/05 '00/07 '00/09 '00/11 '01/01 '01/03 '01/05 '01/07 '01/09 '01/11 '02/01 '02/03 '02/05 '02/07 '02/09 '02/11 '03/01 '03/03 '03/05 '03/07 '03/09 '03/11 '04/01 '04/03

K2K Horns Logbook (1) Water level gauge January 10, 2003 After underwater for 4 years The water level gauge made from Teflon broke. Radioactive dirty water Reservoir, Eliminator unit Pump unit

(2) Canned-Rotor Pump The swirl pump of a multi-stage type A canned-rotor pump is no liquid leak and low noise April 4, 2003 without a mechanical seal and a cooling fan. Water leaked from the mechanical seal of a swirl pump. The pump was changed into the canned-rotor pump.

(3) Harness of a sticking-by-pressure terminal Jun 06, 2003 After 25.8 million operations The harness of a cable shook and broke. shake 2nd Horn 1st Horn Transformer Transformer

Status of JHF Horns • Horn system optical design (Ichikawa) • Target station design for Target and Horns (Yamada) • Basic parameters (NBI03 version) • High priority subjects - Consideration to recycle of K2K equipments - Welding technology for making a inner conductor - Design to installation to Target station with He-tight - Durability test by the power supply of K2K horn • Construction Schedule

Basic parameters Horn #1 Horn #2 Horn #3 Proton beam energy 50 GeV 3x10 14 ppp Beam Intensity Ring cycle 3.6s Pulse length 5 µs Horn current peak 300 kA Inductance 0.55 µH 0.46µH 0.48µH Resistance 118µ Ω 100µ Ω 90µ Ω Transformer ratio 5 Peak risetime 0.31ms Joule heating 1.1kW Radiation Heating 10kW Capacitance 1.0mF Charging voltage 5400V φ1 400 φ 800 φ 900 φ 470 φ 360 φ 56 1 500 2000 2500

1st Horn 300kA Thickness 3mm TARGET D 360mm D 56mm t 3.6mm t 3.6mm R 75mm 250mm 30 mm 1500 mm A6061 、 or (A2219, A7003, A5083)

2nd Horn 300kA Thickness 3mm D900mm D470mm D60mm 30mm 2000 mm

3rd Horn 300kA Thickness 3mm D1400mm D800mm D100mm 30mm 2500mm

Comparison with the welding method Proof Heat stress Workability Cost Merit/ Demerit distortion (A6061) A welding pretreatment is ○ ○ ○ ○ required. The large equipment is ◎ ◎ ◎ ◎ ○ ○ ○ ○ △ △ △ △ Laser Beam Welding ～ ～ ～ ～ 85% required. Triming is needed after welding. ○ ○ ○ ○ The vacuum chamber containing a ◎ ◎ ◎ ◎ ○ ○ ○ ○ △ △ △ △ Electron Beam Welding horn is needed. Triming is needed ～ 85% ～ ～ ～ after welding. ○ ○ ○ ○ New technology. No-Trimming ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ○ ○ ○ Friction Stir Welding after welding. Easy to adjust the ～ ～ 80% ～ ～ length. ～ 0.3mm △ △ △ △ MI G (metel inert gas) Welding distortion is large. There △ △ △ △ ○ ○ ○ ○ ◎ ◎ ◎ ◎ ～ ～ ～ 60% ～ Welding is variation in the quality by skill. △ △ △ △ TI G (tungsten inert Welding distortion is large. There △ △ △ △ ○ ○ ○ ○ ◎ ◎ ◎ ◎ ～ ～ 60% ～ ～ gas) Welding is variation in the quality by skill.

Mechanism and Merit of FSW (Friction Stir Welding) FSW HITACHI, Ltd. • Invented at TWI(1991) • Applied to space rocket, train body • Very low distortion -Good dimensional stability and repeatability • Fully mechanical process -No fume, porosity or spatter • Excellent mechanical/metallurgical properties • Very cost effective

R = P min / P max = 0.1 LOAD P tim e 0 P min( σ min) -2.25kN P max( σ max) -22.5kN

Result （ ×10 -6 ） 400 θ -axis 200 0 270 deg 90 deg Max. Distortion ε -200 -400 -600 -800 z-axis -1000 1.0E+00 1.0E+01 1.0E+02 1.0E+03 1.0E+04 1.0E+05 1.0E+06 1.0E+07 1.0E+08 Number of repetition times N It carried out 1.09x10^ 7 times by the maximum load 22.5kN. The damage by repetition fatigue was not found.

Target Station (Y.YAMADA) To reduce NOx and Tritium in the target station > The He gas is filled in TS. Tr. Tr. Tr. He

Concrete stuffing strip line Surface treatment (t 25 μ m hard anodic oxide coating + sealing) Withstand voltage 2.8kV-2x10 10 ohm Heat resistance 300 degrees C-4hr Corrosion resistance Salt spray test OK (ASTM-B-117)

The pulse currents test by the power supply of K2K Horn Power supply of K2K Horn Transformer •JHF Inner conductor Secondary Primary + K2K Outer conductor ２次コイル・４回路分 １次コイル circuit ４回路分 circuit •Transformer ratio: 10 -> 5 並列接続 2 turns 20 turns 250kA -> 300kA(Max.500kA) x 4 circuits The pulse test will be begun in spring of 2004.

Horns Construction Schedule Fiscal year 2003(H15) 2004(H16) 2005(H17) 2006(H18) 2007(H19) 2008(H20) 4 7 10 1 4 7 10 1 4 7 10 1 4 7 10 1 4 7 10 1 4 7 10 1 K2K Horns Running Running Remake of K2K power supply #1,#2 power supply Design of JHF Horns and TS Design Production of Horn #1 full-size Install of peripheral equipment peripheral Durability test of JHF Horn #1 test Combines with a target Production of Horn #2 full-size Durability test of JHF Horn #2 test Production of Horn #3 full-size Durability test of JHF Horn #3 test Production of new power supply #3 power supply Production of 3 Horns full-size Construction of TS Construction of TS Preparation of peripheral equipment Install in TS Commissioning

Summary • Now our K2K horns are very stable. • We should pay attention more and more to peripherals. • Now we design JHF Horns and Target station. • I want to excitation tests about full size horn and all peripherals in the real situation as soon as possible.