スライド 1

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

Hyperball-J
(Frame outer size)
 Test


Cooling test by refrigerator
Existent vacuum chamber
with the same arm length
Designed by Ishimoto-san
335 mm
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.
2.
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.
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
Vacuum pump port
Heat exchanger
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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