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‘Review’ of J-PARC horn status

‘Review’ of J-PARC horn status. For discussion w/ Eric Zimmerman and Larry Bartoszek 22/Apr/04. I will report about the target at next meeting. Y. Yamanoi, Y. Yamada and A. K. Ichikawa. J-PARC Neutrino Horn System. 1st 2nd 3rd 320kA 320kA 320kA.

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‘Review’ of J-PARC horn status

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  1. ‘Review’ of J-PARC horn status For discussion w/ Eric Zimmerman and Larry Bartoszek 22/Apr/04 I will report about the target at next meeting. Y. Yamanoi, Y. Yamada and A. K. Ichikawa

  2. J-PARC Neutrino Horn System 1st2nd3rd 320kA 320kA 320kA 0.55mH 118mW 0.46mH 0.48mH

  3. 1st Horn Inner Conductor

  4. Stress Analysis

  5. Allowable stress Aluminum 6061-T6(extrusion) tensile strength (引っ張り強度) 282 MPa yield strength (耐力) 245 MPa fatigue strength (97.5% at 10^8) 69 MPa water x 0.43 stress ratio x 0.85 (not yet estimated) allowable stress 25 MPa x fweld From Larry’s presentations

  6. Load • Lorentz force • Thermal stress • From Joule’s heat 2.8kJ w/ 0.4ms full width pulse • 4.3kJ w/ 0.6 ms • 21kJ w/ 3ms=K2K pulse • From radiation ~30kJ • DTmax ~ 21o at r=30mm (EaT=35MPa)

  7. Stress analysis using ANSYS 1st horn 2-dim. Cylindrical model Set maximum allowed stress to 25 MPa (~1/11 of yield strength. Taking into account fatigue, moisture etc.) Static analysis for Lorentz force • Optimization of shape • Time evolution thermal analysis • Check of cooling condition (old version only) • Time evolution analysis for stress • from Lorentz force and heat load • Check of shape and cooling condition (old version only)

  8. Lorentz force 3mm thick aluminum beam seq < 20 MPa @ 320kA Deformation < 60mm (Lorentz force only)

  9. 5ms 3.6 s Heat load by radiation to 1st horn Old Version Water temp. ~25o To be operated <80o, Joule’s heat should be small. -> short pulse operation. 0.4ms~0.6ms width 30MPa

  10. Heat load by radiation to 1st horn Temperature rise w/ 3.3E14 ppp welding point

  11. Heat load to 1st horn Target position dependence

  12. Heat load by radiation to 2nd horn

  13. Thermal stress analysis We know that the thermal stress is very severe for the 1st horn. To loosen it, the inner conductor radius were increased up to 30mm. After the cooling test, time evolution stress analysis w/ Lorentz force and themal stress will be done again.

  14. 2nd and 3rd horn stress analysis Only very rough calculation. The shape optimization is not yet completed. Followings are just examples.

  15. 2nd horn ¼ model 3mm thick aliminum Optimized model

  16. 25MPa

  17. 3rd horn ¼ model 3mm thick aliminum Optimized model

  18. 20MPa

  19. Cooling Test setup

  20. Other R&D items -1-Coating Ni coating on inner conductor? Silver coating at connection? Anodizing of outer conductor?

  21. Other R&D items -2-Welding FSW for 1st horn? Tig welding for 2nd and 3rd horn?

  22. Other R&D items -3-Insulation W/ 0.4ms pulse, the 1st horn high voltage goes up as high as 1.4kV. Probably pulse width should be lengthened by ~1.5 times. Electric leakage by ionization should be checked? I=320kA

  23. @60oC He N2 9kV 4.5kV

  24. Other R&D items -Connection-

  25. Other R&D items -Strip-line- To avoid discharge, Al of w=400mm, t=20mm and gap=20mm looks reasonable.

  26. Other R&D items -Field measurement- Develop pick-up coil to be aligned precisely inside the horn

  27. Other R&D items -Support structure- • Support structure for horn itself • Remote alignment system • Required accuracy ~1mm. • Support structure for strip-line • Relation to the shielding

  28. Other R&D items -Remote Maintenance- Top View Side View Disconnect Horn and it’s support structure including strip-lines. Is this realistic? Residual radiation level should be checked. Anyway, we need remotely connectable/dis-connectable cuppling For strip-lines and water pipes.

  29. Supplement

  30. 3mm thick aluminum rin=26mm, I=320kA Lorentz force only seq= 50MPa End cap shape seq=472MPa seq=37MPa Old version seq < 23 MPa Deformation < 100mm

  31. Target current status • Effect of radiation is being studied. • ~0.26 dpa/yr • shrinkage, worse conductivity, swelling are problem. • We have a one basic design w/ water cooling. • Coaxial two water paths. • However water cooling has problems. • shrinkage inside container, • pressure of instantaneous temperature rise of water • Therefore, we started to think about He cooling. • Can be operated at rather high temperature, hence lower radiation effect. • Coaxial two flow paths. • ~30m/s @ 5 atm. • For the compressor, we are onsulting cryo. group at IPNS, KEK • Cooling path material • Start basic designing w/ Al, Ti and C/C composite • Insulator from horn(~1kV) • Start thinking about ceramics and plasma sprayed alumina.

  32. horn flow Graphite target

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