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SksMinus status 05

SksMinus status 05. HB meeting 2008/5/16 白鳥昂太郎. Contents. Helium target. Helium target status. Optimize Target length : 335 mm (very tight length) Target shape : Cylinder → Elliptic cylinder , material selection Arm design : HBJ frame Test Cooling test by refrigerator

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SksMinus status 05

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  1. SksMinusstatus05 HB meeting 2008/5/16 白鳥昂太郎

  2. Contents • Helium target

  3. Helium target status • Optimize • Target length : 335 mm (very tight length) • Target shape : Cylinder → Elliptic cylinder, material selection • Arm design : HBJ frame • Test • Cooling test by refrigerator • Existent vacuum chamber with the same arm length Hyperball-J (Frame outer size) Designed by Ishimoto-san 335 mm

  4. Points • Arm design : No interference to HBJ frame • Target shape : Not cylinder ? • Material : Al or CFRP • As small background as possible • Thickness : Enough thickness to pressure or thin surface with additional parts

  5. Arm design Hyperball-J (Frame outer size)

  6. Arm design Target arm cannot be changed ! • The design is the unique solution of the design for the tilted arm. • 45°is the limit to connect the target cell. →The tile angle can be smaller, if the Helium target refrigerator moves to the upstream. But, the upstream part of the target cell length has to be longer . In addition, the connection structure is very thigh to change.

  7. Target shape

  8. Target shape • Cylinder target is much better than ellipse cylinder target. • Target outer cell becomes larger ! • The thickness of surface becomes thicker. • There is no good method to make thinner ellipse cylinder target than cylinder target. Ishimoto-san and company have no experience to make such an ellipse cylinder target. ⇒R&D • The diameter of 220 mm is the limit, if the inner cell diameter is 120 mm. • Cooling time can be faster with the change of the heat exchanger. (And, at first by using liquid Helium, it can be much faster.)

  9. Refrigerator • Ishimoto-san has 2 refrigerators and 1 compressor. • We can use 1 set of refrigerator and compressor. • If possible, he wants to buy 1 compressor. • Cost: refrigerator : 230万円, compressor : 230万円, set : 450万円 • The structure of heat exchanger will be changed for the Helium cooling. • In previous his test, the structure is for the liquid Hydrogen target.

  10. Refrigerator From compressor Helium duct Vacuum pump port Heat exchanger Helium buffer tank

  11. Pictures

  12. Summary • Target arm : To change Hyperball-J frame • Target shape : Cylinder (Ellipse cylinder R&D) ⇒Design is finished, after those things are fixed. And, Ishimoto-san will estimate the total cost. • Test : To cool Helium to the liquid with the refrigerator optimize.

  13. Plan • 図面⇒干渉チェック • HBJの干渉を見て避けるようなgeometryでシミュレーション

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