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Helium Target Arm Design and Cooling Optimization for Hyperball-J Project

Discusses the design parameters, material selection, and cooling tests for the helium target arm, emphasizing the unique solutions and limitations. The goal is to optimize the cooling process and finalize the design for the Hyperball-J project.

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Helium Target Arm Design and Cooling Optimization for Hyperball-J Project

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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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