Liquid H2 Absorber Production

Contents(1) MICE Absorber Status

(2) MICE Absorber Modification

(3) Plan/Schedule

(4) Summary

MICE CM-23 in HARBIN

Shigeru Ishimoto KEK

MICE CM-24, May 31 - June 3, 2009 - RAL

New Absorber Test Area

( KEK North Counter-Hall )

Test Cryostat

2 m3 G-H2 Tank

OLD K2K BEAM LINE

machining after welding

2 heater

2 test windows

4 Mini-flanges

Absorber at MIRAPRO

( Mar-13th, 2009 )

368 mm Error <0.2>

Absorber at MIRAPRO

( Feedthrough and Parts )

G-10 Support Parts

L-H2 In and 30 Pin

Feedthrough

Absorber at MIRAPRO

( Thanks MIRAPRO Technician and Engineer )

Mr. Nakamura

Aluminum Welding Expert

Absorber at MIRAPRO

( He Leak Test )

No He Leak

Absorber at MIRAPRO

( Pressure Test at 3.0 bar )

No N2 Leak at 3.0 bar

Temperature & Level Sensors in the

Absorber

10X2 = 20 wires

In L-H2 in G-H2

2 wires; 5 Thermometers IT = 0.1 mA

2 wires; 5 Level sensors IL = 0.5 or 1.0 mA

(Total ; 20 wires)

10 Cernox 1050-SD

Calibrated 4 - 329K

(Supplied by LBNL)

Sensor and Heater ( Overall )

HTR-25-100W

25.410X2 = 20

D=1/4”

Level Sensor Current

Absorber Assemble

Sensor BlocksCable in groove

soft solder and shrink tubes

Cernox 1050-SD

Absorber Assemble

Aluminum Punching Board

t=0.5 mm

Aluminum Plates t=1

mm

5 Sensor Blocks

Absorber Assemble

Thermometer Blocks

x4

Heaters x2

Connecter x2

L-H2 IN and 30 Pin Connecter

L-H2 OUT

Absorber Assemble

G-10 Support

x8

M.L.I.

L-H2 IN

Absorber Assemble

L-H2 IN

Connecter x2

9.4

9.0

35.0

4.0

5.0

310

47.5

39.0

2.5

422.4

bobbinThermal radiation shield

Magnet cryostat

Large End Flange

386.0

372.4

24

10.4

This solution is to shift the absorber upstream by 10.4mm

0.4mm

Large End Flange locally thinned down to 2.5 mm

AFC Magnet Problem

( Slide by Wing Lau )

Solution 1

25 35 mm

AFC with ABSORBER

Modification Plan

Too Narrow Points

Off Center 10.4 mm

M.L.I. t=3

AFC with ABSORBER Modification Plan

Too Narrow Points

Off Center 10.4 mm

AFC with ABSORBER Modification Plan

Too Narrow Points

Absorber Support Flange on MAGNET CRYOSTAT

AFC with ABSORBER & Large End Flange

Absorber Support Flange on MAGNET CRYOSTAT

Too Narrow Points

Cut 4 Pipes

at +5 mm Line

4 New Elbows; + 15.4 mm Horizontal

(10.4 + 5)

+ 5 mm Vertical

368 mm

Pipes Extension Plan

Pipes Extension Plan

368 + 10.4 mm

4 New Elbows

Disassembled ! ! ( May 20th, 2009 at KEK )

Cut Here

(+5 mm Line)

Absorber Schedule

Absorber Body-#1 Schedule was 3 month delayed due to

pipes modification.

Absorber Body-#2 will be ordered on Jul-Aug 2009.

Absorber Body-#3 will be ordered in FY2010 in Japan.

Summary

(1) The first absorber body was successfully fabricated and tested by MIRAPRO. The absorber arrived at KEK on Mar-18th at KEK.

(2) Absorber body assemble was finished at KEK temporally.

(3) Test cryostat preparation and DAQ programming are in progress.

(4) Absorber parts are disassembled to extend 4 pipes +10.4 mm. This solution was accepted by the MICE-TB on May-18th.

(5) We need enough space at large end flange to minimize risk of heat leaks.

(6) Absorber needs a support structure on the magnet cryostat.

(7) Schedule;Absorber Body-#1 Schedule was 3 month delayed due to

pipes modification.

Absorber Body-#2 will be ordered on Jul-Aug 2009.

Absorber Body-#3 will be ordered in FY2010 in Japan.