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Target mainly by T. Nakadaira, Y. Hayato, A.K.Ichikawa

Target mainly by T. Nakadaira, Y. Hayato, A.K.Ichikawa. Here, I will report about the present status on target R&D. Current main member around target. Construction group leader T. Kobayashi Convener of target and horn system : A.K.Ichikawa Convener of target station : Y. Yamada

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Target mainly by T. Nakadaira, Y. Hayato, A.K.Ichikawa

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  1. Target mainly by T. Nakadaira, Y. Hayato, A.K.Ichikawa Here, I will report about the present status on target R&D.

  2. Current main member around target Construction group leader T. Kobayashi Convener of target and horn system : A.K.Ichikawa Convener of target station : Y. Yamada Target design : T. Nakadaira et. al Target FEM calculation : Y. Hayato et. al Radiation damage study : Y. Hayato et. al • International collaboration • Horn, especially on 2nd horn with E.Zimmerman and L.Bartoszek • Target : start discussion with RAL

  3. Thermal Stress cal. w/ MARS Temperature rise of the target due to the radiation J/gK degree w/ 1 pulse R Z 2.6MJ in 5ms Aluminum cannot withstand. Only low-Z material such as graphite or beryllium. Thermal stress 6.8 MPa (safety factor ~3 against fatigue strength)

  4. Water cooling Water Temp. 25oC Heat transfer rate 5kW/m2K confirmed by cooling test Flow rate 20 l/min

  5. Case (container) Gap Target (Graphite) Effect of irradiation IG-110 @400oC 2dpa -> -0.5% @ J-PARC n 0.26dpa/year

  6. Effect of irradiation on graphite • Damage by neutron irradiation • 0.25dpa@200oC… Change of dimension +0.14% • Thermal conductivity -98% • 0.13dpa@300oC… … Change of dimension -0.01% • Thermal conductivity -75%

  7. Coaxial cooling pipe : Ti or Graphite

  8. Time evolution of temperature(assuming specific heat at constant pressure) Condition (example) a~600W/m2K @~1atm. flow velocity 170m/s 25℃ 380℃ ~80℃ 660℃ ~430℃ ~620℃ 780℃

  9. Prototype design of Target system • Prototype design for He cooling pipe is in progress. Exit of He Entrance of He Graphite Cap graphite Target Outer Pipe t=0.3mm Ti-6Al-4V Inner Pipe t=2.0mm Graphite or t=0.3mm Ti (Ti-6Al-4V)

  10. baffle

  11. Temperature rise with nominal beam • 理想的なバッフル • ターゲット外径=バッフル内径 • 水冷の場合 配管Al 0.8mm

  12. Temperature rise with mis-directed beam

  13. Baffle –other possibility-

  14. vertical alignment rods xy-stage frame B (vertical motion) frame A (fixed) frame C (horizontal motion) One of the Concept of Horn support Adjusting bolt Rod for position measurement Adjusting bolt by S.Koike

  15. Another Concept of Horn support ~1.5mくらいか ~4m 支持基準 ~1m 支持基準を100mmで調整できれば、 ~1mmは達成できる？

  16. 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.

  17. comments The target is a critical part of the project and the relation to the 1st horn is rather complicated. I feel that careful discussion is necessary before the real collaboration on the target to make clear situation.

  18. Supplement

  19. Target Nu-TAC以後の進展 • Graphiteの熱応力の再評価 (S. Ueda) • 比熱の温度依存性のupdate & bug fix • 安全率３　は満たされている。 • 東洋炭素 ISO-88についても安全率を評価

  20. 内側配管の温度勾配/応力分布 横軸: 0=最内面 1=最外面 • Al合金(0.8mm厚),Ti合金 (0.3mm厚) ~200℃ 円周方向応力 <２ＭPa 動径方向応力 <10kPa 安全率 等価応力<３ＭPa 軸方向応力 <４ＭPa

  21. Ｈｅ冷却管のプロトタイプの設計 • Heの流量、除熱能力を試験したい。 • KEKB/Belleの衝突点チェンバー冷却用のHeシステムを使ったテストの検討中。 • 最大ゲージ圧0.1MPa, He流量400 [l/min] • カウンターホールへの移設可 • 電源: 200V15A • 冷却水 10-50[l/min] • 冷却配管を設計中 • 絶縁材の材質を検討中

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