1. MICE Meeting at RAL, Oct-23, 2005
Absorber R&D Progress
KEK S. Ishimoto, S. Suzuki
K. Yoshimura
Osaka Univ. Y. Kuno, A. Horikoshi
MICE Meeting at RAL, Oct-23, 2005

2. MICE Absorber System with Cryocooler
G-H2 cylinders/H2 tank/ Metal hydride
He refrigerator
L-He Dewar
G-H2 safety exit and reservoir tank
L-N2 Dewar
He, N2 gas exit/return
G-He cylinders
Exit to cool the transfer tube
H2 leak monitor
Absorber vacuum system
Safety exit for H2

3. MICE Absorber Room Temp. Magnet Bore L-H2 OUT L-H2 Level Sensor
Thermometers
Lake Shore CX-1050-SD
L-H2 IN
2-Heaters
Lake Shore HTR

4. Test Cryostat at KEK -- Original Plan
MICE
Cryocooler RDK-415D
MICE Test Absorber

5. Absorber Test Subjects at KEK
Test Absorber  Real Absorber #1, #2, #3
(1) Absorber leak test at 20K and 4.2K
* body, pipes, In seal …
(2) LH2 absorber (< 1 L)
* pre-cooling process with LN2 or without LN2
* cooling speed, warm up speed
* cooling power and heat leak test
(3) LHe absorber
* pre-cooling process with LN2 or LHe
* How much additional Lhe, if it needs?
(4) Instrumentation
* LH2 level and temperature sensor test
* control and DAQ
(5) Real window test at 20 K?

6. Test Cryostat with Test Absorber

7. New Parts (1) Needs Modify > Aluminum plug at top
> KF25 & pipe on window
Needs Parts on/in Absorber
> Flexible pipes
> LH2 level sensor
> Thermometers
> G10 supports

8. New Parts (2) Needs Parts around condenser > LH2 condenser body
> Flexible pipes
> Thermal links
> Feedthrough

9. Top Flange & Absorber Support

10. H2 Condenser Cryocooler Cryocooler Bottom Flange Indium/Grease
- Copper Flange; T=6 mm
- Screws; 6-M5 on copper
- Weight 2~3Kg
Mechanical design
Good thermal contact
LH2 Supply
5 mm higher than bottom to keep LH2 level
KEK LH2 target

11. KF40 + 48 pin + LH2 Level sensor
Feedthrough at 20K
LH2
VAC
KF pin + LH2 Level sensor

12. Test Cryostat with MICE Absorber #1，#2，#3
Vac. Pump + Gate Valve

13. Test Cryostat with MICE Absorber
Needs pipe joints

14. Absorber Test Cryostat
Cryocooler

15. Absorber Test Cryostat

16. Parts (1)

17. Absorber is now at the company to modify the top port and window.
Parts (2)
Fix and Flexible Tubes
Test Absorber
Absorber is now at the company to modify the top port and window.
G10-SUPPORT

18. Parts (3)

19. Summary Test items at KEK
(2) The Cryocooler, test absorber, T.M.P. and vacuum gauges were temporally assembled to decide pipe length.
(3) The LH2 condenser and related parts were designed and ordered.
(4) Flexible and fixed pipes were designed and ordered.
(5) Feedthrough (48pins) were ordered.
(6) We will start the parts assemble from mid-November.
(7) Absorber cooling starts this year
1st test; Cryocooler + H2 condenser cooling test
2nd test; with absorber cooling test
3rd test; cooling power and heat leak test
 LHe absorber test