Nov-1st 2004, MICE TV Conf. Plans for absorber tests at KEK Shigeru Ishimoto KEK

Absorber test plan KEK Absorber body *Pressure test at 20K with dummy windows US/FNAL Windows *Pressure test at R.T. RAL *Pressure test at R.T. *Cooling test at 20K KEK *Pressure test at R.T. with windows *Pressure test at 20K with windows KEK Absorber test cryostat - Absorber body test - Windows test - Cryocooler cooling test at 20K and 4.2K - Sensor calibration

Cooling power with full radiation shield Radiation heating from 300K KEK/RIKEN Cryocooler RDK415D for solid hydrogen target WARNING; Operation & extraction of full cooling power from Cryocooler is not always easy.

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

MICE absorber system with Cryocooler for L-He absorber G-He exit and recovery He, N 2 gas exit/return H 2 leak monitor L-N 2 /He Dewar G-He cylinders Absorber vacuum system Safety exit for H 2 L-He Dewar L-He 1 + q W  35 x 2 x q L/day Exit to cool the transfer tube

MICE absorber system with Cryocooler

MICE absorber system with Cryocooler H2 In Pipe

Absorber test cryostat ATC-002 (dimensions) MICE (needs larger Cryocooler flange for pips) D2; Cryocooler flange W W H2 H1 D1

Absorber test cryostat ATC-002 (absorber support) Inside diameter of MICE magnet bore S-S tube for absorber support at room temp. top flange

Absorber test cryostat ATC-002 (top view) Top flange Absorber  needs modify

Absorber test cryostat ATC-002 (Mirapro) Ordered; Nov ’04 Arrive; Mar ’05

Thermometers & level sensor 4 wires measurement  use standard read-outs  required wide are in LH2 pipe

CX-1050-SD 10 sensors ware calibrated at FNAL. LH 2 level sensor and thermometers

Calibration of LH 2 level sensor x5 Cryocooler + LH 2 condenser

Test area (KEK-east counter hall) H 2 gas exhaust duct to fan Nov-26, ‘04 H 2 gas tank (2m 3 ) LH 2 target (~ 0.5 L) for E559 LHe-II target for E549

Summary 1/2 (Test Item) (I) Cooling test by LH 2 (Cryocooler) ; H2 ABSORBER 1) Pre-cooling test to 20K ---- LH 2 < 1 L 2) Absorber pressure/leak test at 20K ---- P=2.0 bar, leak < Torr*L/s 3) Heat leak test at 20K  measure the H 2 evaporation rate (II) Cooling test by LHe (Dewar + Cryocooler) ; He ABSORBER 1) Pre-cooling test to 4.2K ---- LHe ~ full 2) Absorber pressure/leak test at 4.2K ---- P=2.0 bar, leak < Torr*L/s 3) Heat leak test at 4.2K  measure the He evaporation rate (III) Windows test 1) Windows pressure/leak test at 20K ---- if required (IV) Sensor test (without absorber) 1) Thermometer calibration 2) LH 2 level sensor calibration

Summary 2/2 (status/schedule) (1) Test Cryostat ---- ordered to MIRAPRO Nov, ‘04 will arrive by the end of March (2) Cryocooler --- ready, will arrive soon have to share with the VLPC test at KEK? (3) Absorber body ; ready, needs modification and piping (4) LH 2 Reservoir and piping around Cryocooler needs design and fabrication --- fabrication start from March?  needs detail MICE design (5) Thermometers calibrated CX-1050; ready (6) LH 2 Level sensor and housing --- AMI capacitance sensor ; ready needs copper block to fit Cryocooler (7) LH 2 Level resistance sensor uncalibrated CX-1050; ready