Nov-1st 2004, MICE TV Conf.

Plans for absorber tests at KEKShigeru 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.

CryocoolerRDK-415D

LH2

LH2

MICE absorber system with Cryocooler

He refrigerator

Exit to cool the transfer tube

G-H2 cylinders/H2 tank/ Metal hydride

G-H2 safety exit and reservoir tank

He, N2 gas exit/return

H2 leak monitor

L-He Dewar

L-N2 Dewar

G-He cylinders

Absorber vacuum system

Safety exit for H2

CryocoolerRDK-415D

LH2

LH2

MICE absorber system with Cryocooler for L-He absorber

G-He exit and recovery

He, N2 gas exit/return

H2 leak monitor

L-N2/He Dewar

G-He cylinders

Absorber vacuum system

Safety exit for H2

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

CryocoolerRDK-415D

KF25KF40

KF16

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.

LH2 level sensor and thermometers

Calibration of LH2 level sensor

x5

Cryocooler

+ LH2 condenser

Test area (KEK-east counter hall)

H2 gas exhaust duct to fan

Nov-26, ‘04

H2 gas tank (2m3)LH2 target (~ 0.5 L)

for E559

LHe-II target for E549

Summary 1/2 (Test Item)

(I) Cooling test by LH2 (Cryocooler) ; H2 ABSORBER

1) Pre-cooling test to 20K ---- LH2 < 1 L

2) Absorber pressure/leak test at 20K ---- P=2.0 bar, leak < 10-10 Torr*L/s

3) Heat leak test at 20K measure the H2 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 < 10-10 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) LH2 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) LH2 Reservoir and piping around Cryocooler

needs design and fabrication --- fabrication start from March?

needs detail MICE design

(5) Thermometers --- 10 calibrated CX-1050; ready

(6) LH2 Level sensor and housing --- AMI capacitance sensor ; ready

needs copper block to fit Cryocooler

(7) LH2 Level resistance sensor --- 5 uncalibrated CX-1050; ready