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