1. Liquid-hydrogen absorber: Shigeru Ishimoto KEK Contents (1)Introduction (2)MICE absorber design (3)Prototype absorber test at KEK (4)MICE absorber instrumentation (5)Schedule (6)Summary status report hydrangea UKNF/MICE Oversight Committee meeting, RAL, Jul-21, 22, 2008

2. MICE cooling channel Drawing by S. Q. Yang Tracker Module 1 Tracker Module 2 AFC Module 1 AFC Module 3 AFC Module 2 RFCC Module 1  BEAM

3. AFC (Absorber & Focus Coil) module Cryomech PT415 cooler (1.5W@4.2K) LH2 condenser Safety windows absorber windows

4. G-10 Support Absorber & Pipes Mini In-Flange (Al-SS) 30 Pin Feedthrough Tee  L-H2 IN G-H2 OUT G-He/N2 OUT L-He/N2 IN

5. A-A’ (22.5 deg.) G-H2 OUT  L-H2 IN G-He/N2 OUT LHe/LN2 IN Tee 30 Pin Feedthrough Heat- exchanger LH2

6. MIRAPRO Co. Liquid-hydrogen absorber

7. Flange of MICE absorber Design window; Oxford Design flange; KEK Machining ; Mississippi Tolerance between flange and body: 0.1-0.3 mm

8. G-10 (x8) t=1, W=25, L=90 mm Total ~ 0.2 W SS, t=1 Screws on AFC Magnet 76.5 34 SS  15.7 AL  14.8 34 From Absorber Small flange and G-10 support

9. Tee and 30 pin feedthrough In seal Kyocera 30 pin feedthrogh

10. Support for pipe welding pipe welding  L < 0.5mm

11. Prototype absorber MICE absorber test at KEK 1,959 T.M.P. G-M Cryocooler 1.5W@4.2K LH2 condenser Dummy bore (room temperature)

12. Prototype absorber

13. Prototype absorber test at KEK

14. 0.30 l / h, 2.6 W 1.33 l / h, 11.7 W 2000 l tank Cooling stop LH2 1.43 l  68 hrs to fill 20 l Liquefaction and vaporization of LH2 in 20 l Absorber

15. MICE absorber test at KEK H 2 vapor Cernox calibration curve

16. H2 Press (Torr) n-H2 Temp.(K) e-H2 Temp.(K) Absorber Temp.(K) T (K) DAY MICE absorber test at KEK

17. 10 Cernox 1050SD 4 wires; AB101, 102, 105, 109,110 2 wires; AB103,104,106,107,108 (Total 5*4 + 5*2 = 30 wires) I m =0.1 mA; 101,103,105,107,109 I m =1 mA; 102,104,106,108,110 Temperature & level sensors in the absorber In LH2 over heating mode in gas

18. Sensor and heater (overall) HTR-25  -100W 25.4

19. CX-1050-SD Sensor blocks 2 cernox inside absorber cernox for L-H2 pipes cernox for L-N2 pipes 19 16 20 5 2 or 4 x 0.14 mm2 ETFE cable

20. Delivery of 1st FC Oct 2009 Spring 2010 Q4 2010 -- 2011 STEP VI STEP V STEP IV MICE absorber schedule KEK to RAL Arrive 2 absorber flanges from US KEKRAL

21. Summary (1)Absorber R&D at KEK was successfully finished and MICE absorbers were designed based on this experience. (2)We are ordering the first MICE absorber body to Japanese company. It will be delivered by the end of Oct- 2008 after the cooling test at KEK. The Second absorber will be ordered in Nov-2008, and delivered by Feb-2009. (3)Thermometer/level sensors inside and outside absorber body will be wired in Japan. (4)Thin absorber flanges will be set at RAL. First flanges will be delivered by May-2009 from Univ. of Mississippi. (5)The overall assemble in the AFC module will start from Jul-2009 at RAL.

22. Thank you Hokusai Katsushika “Hydrangea and Swallow”