1. SksMinus status 08
HB meeting
2008/7/10
白鳥昂太郎

2. Contents
SAC : size, number of radiator
BAC : size, number of radiator

3. SAC

4. Beam profile : FF + 600 mm x y Simulation with Gaussian distribution
sx ~26.0 mm
sy ~4.0 mm
s(dx/dz) ~20 mrad (1.1°)
s(dy/dz) ~2 mrad (0.1°)

5. Geometry and condition
250 mm target : Helium
Target cell space : SAC position + 40 mm
100 mm target : Others
Hits : Require drift chamber and STOF hits
Reaction
4He(K-, p-), q~20°
Uniform 1.4 GeV/c p beam, q~30°

6. Particle distributions at SAC entrance : 4He 250 mm
X : SAC1 ~220 mm, SAC2 ~300 mm
Y : SAC1 ~60 mm, SAC2 ~80 mm

7. Particle distributions at SAC entrance : 1.4 GeV/c uniform, 250 mm
X : SAC1 ~220 mm, SAC2 ~300 mm
Y : SAC1 ~60 mm, SAC2 ~80 mm

8. Particle distributions at SAC entrance : 4Li 100 mm
X : SAC1 ~180 mm, SAC2 ~200 mm
Y : SAC1 ~40 mm, SAC2 ~40 mm

9. Particle distributions at SAC entrance : 1.4 GeV/c uniform, 100 mm
X : SAC1 ~180 mm, SAC2 ~200 mm
Y : SAC1 ~40 mm, SAC2 ~40 mm

10. Summary SAC size : 250 mm target (100 mm target)
SAC1 : 220 mm×60 mm (180 mm×40 mm )
SAC2 : 300 mm×80 mm (200 mm×40 mm )
SAC sizes are almost determined by the beam distribution at the target position.
110 mm×110 mm×10 mm
⇒ 40 mm radiator
(SAC1 : 2×4, SAC2 : 3×4)

11. BAC

12. Beam distributions at BAC entrance
X : 160 mm (Hyperball-J entrance ~168 mm)
Y : 30 mm

13. Summary BAC size 110 mm×110 mm×10 mm ⇒ 6 ⇒ 8 radiators ? ×3 ⇒ ×1 ×3
BAC1&2 : 160 mm×30 mm
110 mm×110 mm×10 mm
⇒ 6 ⇒ 8 radiators ?
110
165 ×3 55 55 ⇒
110 55 ×1 ×3