1. SksMinus status 14
HB meeting
2008/10/16
白鳥昂太郎

2. Contents
SMF iron
SDC2

3. SMF iron

4. Iron shield of SMF SMF (1) (2) Units (3) (1) 100 cm×50 cm×70 cm×2
Stopping/absorption points
(1)
Simulation
m- (through)
p- (Absorbed in iron)
(2)
Units
(1) 100 cm×50 cm×70 cm×2
(2) 100 cm×50 cm×60 cm×1
(3) 100 cm×50 cm×55 cm×1
(4) 100 cm×50 cm×50 cm×1
(3)
(4)
SMF

5. Iron shield of SMF 70 cm 50 cm (1) (1) 50 cm (2) (3) (4) 100 cm 50 cm
Stopping/absorption points
70 cm
50 cm
(1)
(1)
50 cm
(2)
(3)
(4)
100 cm
50 cm
Simulation
Units
(1) 100 cm×50 cm×70 cm×2
(2) 100 cm×50 cm×60 cm×1
(3) 100 cm×50 cm×55 cm×1
(4) 100 cm×50 cm×50 cm×1
“Ideal” SMF iron shield
(Based on 50 cm cube
+ 20 cm thickness parts
+ 10 cm thickness parts
+ 5 cm thickness parts)

6. Iron blocks for radiation shield
100 cm×50 cm×50 cm
50 cm×50 cm×50 cm

7. Iron blocks for radiation shield
Block-A
100 cm×50 cm×50 cm
Assemble
Block-B
200 cm×100 cm×70 cm wall
(小池さんが頑張って作ってくれたわけはない)
100 cm×50 cm×20 cm

8. Realistic iron shield design
Main parts
Block-A (100 cm×50 cm×50 cm)×5
Block-B (100 cm×50 cm×20 cm)×2
Additional parts
Block-C (100 cm×50 cm×10 cm)×1
Block-D (100 cm×50 cm×5 cm)×1
⇒Do they exist ?
⇒No ! : small blocks (20 cm×10 cm×5 cm) or to buy suitable one
＊To design iron shield by exist blocks (A&B)

9. Realistic design ? Type-1 (1) 100 cm×50 cm×70 cm×2
⇒70 cm part is smaller than 50 cm part
parts
Type-2
(1) 100 cm×50 cm×70 cm×3
(2) 100 cm×50 cm×50 cm×2
⇒70 cm part is larger than 50 cm part
Type-1
Type-2

10. Performances of realistic design
Type-1
m- eff. : 89.1%
p- miss : 3.9 %
Type-2
m- eff. : 87.4%
p- miss : 2.2 %
parts
Type-1
Ideal
m- eff. : 88.2%
p- miss : 2.3 %
Type-2で鉄を厚くした部分を通るmはそこそこ運動量が高い
鉄が厚い分、pが止まりやすい
Type-2

11. How to assemble ? 4 pattern of 70 cm part 70 cm

12. Summary Are there suitable iron block ? ⇒To ask someone ?
Exist blocks can be used for the SMF iron shield.
100 cm×50 cm×50 cm×5
100 cm×50 cm×20 cm×2
Iron frame design
Iron : not to buy ?
SMF counter design : BT

13. SDC2

14. Test Check all channels one by one Plateau curve measurement
Logic signal counting rate w/ or w/o 90Sr source
Satellite signal : Large pulse by cosmic-ray
Vth dependence (noise level) : not carefully
Plateau curve measurement
Coincidence with plastic scintillator by 90Sr source and cosmic ray
(90Sr source is collimated (Hole ~10 mm, 20 mm length))
To open SDC2 and start repairing next week

15. Plateau curve : X-plane
Plateau : 1250～1300 Ar:C2H6 = 50:50
(Potential and cathode : Same HV)

16. To do

17. Design and production Design Production SDC1 & SDC2 frame SMF frame
Iron shield
BH2 and BP
Production
SDC2 repair
BT cut and assemble for SMF
SP0 frame parts
STOF and SMF frame parts