1. Beaver Watching MICE meeting at FNAL Jun-08, 2006 Absorber Progress MICE VC Aug-16, 2006 Shigeru Ishimoto & Shoji Suzuki, KEK

2. 1)Introduction and Absorber Test Cryostat 2)H2 Cooling Test Results cooling time level sensor test 3)He Cooling Test Results cooling time level sensor test 4)4 K Parts Test Results mini-flange, feedthrough... 5)Plan and Summary OUTLINE

3. G-10 Support Absorber & Pipes Mini In-Flange 30 Pin Feedthrough Tee  L-H2 IN G-H2 OUT He/N2 OUT He/N2 IN

4. A-A’ (22.5 deg.) G-H2 OUT  L-H2 IN He/N2 OUT He/N2 IN Straight Pipes Tee 30 Pin Feedthrough

5. Absorber Test Cryostat & Test Absorber Absorber is not yet installed

6. Absorber Test Cryostat MLIH2 TANK 2m 3 (1.0-1.3 bar) ~1 L

7. LH2 Condenser LH2 IN/OUT Heat Links Cryocooler & Condenser Condenser Heater HTR-25-100 (100W) LH2/He Level Sensor In Extension KF40 + 48 pin Feedthrough 1 st stage 2 nd stage

8. LH2/He Level Sensor KF40 + 48 pin Feedthrough KF40 L=100 Extension Tube CX-1050-SD X5 (serial) CX-1050-SD X1 calibrated (4 wires) 2 cm

9. LH2 IN/OUT He IN/OUT Mini In-Flange; S-S/Al joints In SS AL Mini Rotation Flange

10. 1 st stage Heat Exchanger HEAT EXCHANGER ~60K H2 or He GAS INLET

11. Mini-Flange Test Mini Rotation Flange Mini-Flange S-S Aluminum KF16 1mm dia. Indium

12. LakeShore 218S Keithley 2700 DMM Cernox x8 MKS 0-2000 Torr Level #1-5 VAC. Gauge... MONITOR (LabView) Shoji Suzuki LakeShore 218 Keithley 2700 DMM Absorber DAQ System

13. H2 Cooling Test G-H2 was supplied to the Cryocooler from the 2 m 3 tank at 1.3~1.0 atm.

14. L-H2; 0.368 l/h (w/o)  0.973 l/hr (MICE 20 l ; 57 hr  22 hr ) Improvement by the Heat Exchanger 2,000 l Tank -0.193 l/hr ~1.7 W 0.973 l/hr ~8.6 W COOLING STOP

15. L-H2 Level Sensor Test IN LIQUID(#2) IN LIQUID(#1) IN GAS(#5) IN GAS(#4) IN GAS(#3) (#2 ) (#1) (#3 ) (#4 ) (#5 ) 48 PIN

16. L-H2 Level Sensor Test R TH

17. L-H2 Level Sensor Test R TH

18. LHe Cooling Test G-He was supplied to the Cryocooler directly from a cylinder at 1.4 atm.

19. He ~3.7K ~ 0.6atm He ~4.6K ~ 1. 4atm VAC; 10 -7 ~10 -8 Torr (No Leak) LHe 4 K Leak Test (Mini-Flanges and 48 Pin Feedthrough)

20. LHe Condensation and Evaporation Speed ID=4cm 2cm LHe 1.5 atm; 0.207 l/h (MICE 20 l ; 97 hr) 48 PIN

21. LHe Level Sensor Test R TH

22. Calibrated Cernox vs. LHe Vapor Pressure dT=10 mK He Condensation ~ 4.6 K (1.4 atm) T min ~ 3.7 K (0.6 atm) CX-1050SD-1.4D

23. Cernox Calibration (Plan) Calibrated Cernox CX-1050SD-1.4D 1.40K to 100K Calibrated Pt-Co (Chino) 4.2K to 300K 6 Uncalibrated Cernox CX-1050SD 3.7K to 300K T=3.7-300K COPPER BLOCK for 8 Sensors ~6 sensors/day Cryocooler RDK-415D LakeShore 218SKeithley 2700 DMM

24. 1) The LH2 condensation speed was Improved ~2.6 times by the simple heat exchanger. - LH2; 0.973 l/hr (MICE 20l; 22hr) - LHe; 0.207 l/hr (MICE 20l; 97hr) --- needs LHe filling? 2) Level sensors work good in LH2 and in LHe. 3) Mini-flanges (fix and rotation types) and the 48 pin feedthrough ware tested between 3.7K (0.6 atm) and 4.6 K (1.4 atm) without problem. 4) The absorber LH2 cooling test is in preparation. Hopefully, it will be cooled by the CM16 at RAL. 5) Planning a thermometer calibration stage. 6) Developing LabView soft; heater control, level sensor …. Plan and Summary Thank you