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SksMinusstatus
05
HB meeting
2008/5/16
白鳥昂太郎
Contents
Helium target
Helium target status
Designed by Ishimoto-san335 mm
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)
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
Arm design
Hyperball-J(Frame outer size)
Arm design
Target arm cannot be changed !1. The design is the unique solution of the design for
the tilted arm.
2. 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.
Target shape
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.)
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.
Refrigerator
From compressor
Helium duct
Heat exchanger
Vacuum pump port
Helium buffer tank
Pictures
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.
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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