lithium hydride absorber program c. m. lei march 17, 2008
DESCRIPTION
LiH Absorber Program3 Y ‑ 12 National Security Complex will be sub-contracted to fabricate these discs. It is located in East Tennessee, adjacent to Oak Ridge National Laboratory. A facility maintains the nation’s uranium and lithium technology base. Y ‑ 12 National Security ComplexTRANSCRIPT
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Lithium Hydride Absorber Program
C. M. LeiMarch 17, 2008
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LiH Absorber Program 2
• An instrumented LiH disc (30 cm diameter, 4 cm thick) for measuring the thermal conductivity will be made.
• Two LiH discs (50 cm diameter, 6.5 cm thick) will be made as absorbers for use in MICE Step III.1 (first cooling measurement – no RF, 1 disk between upstream and downstream spectrometers)
LiH Discs
LiH Disk inside the Spool piece
CalorimeterCerenkov Detector
Time-of-flight Detector
Solenoid
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LiH Absorber Program 3
• Y‑12 National Security Complex will be sub-contracted to fabricate these discs.
• It is located in East Tennessee, adjacent to Oak Ridge National Laboratory.
• A facility maintains the nation’s uranium and lithium technology base.
Y‑12 National Security Complex
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LiH Absorber Program 4
LiH Discs Fabrication
•Produced by Hot Isostatic Pressing
•Produced using existing mold design
•Tested by chemistry
•X-Rayed by Radiography to ensure no voids
•Machined to size
•Dimensional inspection
•Coated with epoxy completely (needed to be finalized)
•Packaged in drum type container
•Shipped to FermiLab by Fed-XHIP: the simultaneous application of heat and high pressure. A high temperature furnace is enclosed in a pressure vessel. Work pieces are heated and an inert gas, generally argon, applies uniform pressure.
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LiH Absorber Program 5
Manufacturing Drawings for the Discs
12 Blind holes for housing thermo-couples
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LiH Absorber Program 6
The Set Up of the Thermal Test
Stainless steel base structure
High temp glass ceramic
High temp low k gasket
1” copper tube with heaters
12” dia steel ring
Machined LiH disc
Thermocouples X12
Foam board & gasket
Flexible cooling tube
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LiH Absorber Program 7
The Set Up Ready for the Thermal Test
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LiH Absorber Program 8
A Couple of Quick Checks
Heat Sink Check:•A coil of Parflex flexible thermoplastic polyethylene tubing, (¼”OD, 0.04” wall) was wrapped around the steel ring;•Chiller temperature was set at -10C;•Steel ring temperature was at -1C.
Heat Source Check:•3 kapton flex heaters with R=157 ohms were glued to the inside of the copper sleeve evenly;•+123C was achieved on sleeve surface at applied voltage of 30V
LiH Minco Heaters TestResistance = 157 ohm X 3
y = 0.0883x2 + 0.704x + 21.899
0
20
40
60
80
100
120
140
0 5 10 15 20 25 30 35
Applied Voltage, V
Tem
pera
ture
, C
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LiH Absorber Program 9
The Hardware Ready to take the Disc
Glove bag with inert gas flowing during the handling and testing processes
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LiH Absorber Program 10
The MICE Energy Absorber
The absorber is fastened by two M8 screws and nuts first.
Carbon-fiber Clamp Shells
LiH Disc (~ 10 kg)
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LiH Absorber Program 11
The Supporting Tube
Carbon fiber tubing 8 mm OD, 1 mm wall
M8 threaded insert to be glued with the tubing (aluminum or
G10)
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LiH Absorber Program 12
Conceptual Installation
This absorber is lowered down through the slot of the ss spool piece
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LiH Absorber Program 13
Conceptual Design of the End Cover
A saddle with a level platform may be developed to provide a
reliable vacuum seal
Carbon-fiber tubing
Blind cover with carbon fiber tubing attachments
(FNAL Design?)