Transcript MICE_CC_Progress-ICST-WL081020

MICE/MuCool Coupling Magnets
MICE/Muool Coupling Magnets
Progress
2008-10-21
Li Wang for MICE Group
Institute of Cryogenics and Superconductivity Technology
Harbin Institute of Technology, Harbin, China
2008-10-19 to 22
ICST/HIT
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MICE/MuCool Coupling Magnets
Recent Progress
Progress since CM21 at Daresbury in June 2008:
•
Test coils
Winding of large test coil: to be done around Oct.25th
Fabrication of quench protection assembly for large coil: to be done by Oct.25th
Tests for SC joint soldering strength, SC wire bending radius: done
•
Cryo-test system:
Test dewar for diodes: done
Large cryostat: under fabrication
Small cryostat: done
Cryo-valves & bayonets, transfer lines: under assembly
•
Updated design of MICE/MuCool coupling magnets
Cold mass assembly, drop-in mode cryocooler, cold mass support assembly, heat
shields, vacuum chamber, etc.: under going
2008-10-19 to 22
ICST/HIT
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MICE/MuCool Coupling Magnets
Test Coils
• Test coils
Due to relatively high magnetic field (peak field above 7.4T in the coil), largest diameter of the coil in
MICE (ID 1.5m), high strain and stress in the coupling coil, two test coils were designed and
fabricated in order to validate design methods and winding skills, and to practice the worst case
in the coupling coil. The test coils will be powered to a higher current than 210A and The 2nd test coil
will be cooled down using the ICST refrigerator in a cryostat suitable for the training the large test coil and
the coupling magnets.
• Small coil: 350mm x 285 mm, 20 layers, 166 turns/layer, 500 A
To test and debug the winding machine and the wire tension device, to validate the winding skills
such as wet lay-up winding technology, layer-to-layer transition, quench protection lead bringing out,
welding, elec-insulating and winding of SC splices, to produce enough field so that the magnet can be
used for cold diode tests and other sorts of tests to be done in a magnetic field at 4.2 K.
•
Large coil: a full diameter but one-quarter long prototype coil, 96 layers, 42 turns/layer, 350 A
To be expected to be tested under the equivalent or greater strain state than the coupling coil
would encounter during cool down and in magnetic field, to be performed a full scale test of the
coupling coil cold diode and resistor quench protection system with the test coil sub-divided into
four circuits, to test the SC joint soldering technique, to gain training process experience etc.
2008-10-19 to 22
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MICE/MuCool Coupling Magnets
Basic Parameters
Small coil
Large Coil
Coupling Coil
Coil Length (mm)
285
72
285
Coil Inner Radius (mm)
175
750
750
Coil Thickness (mm)
25.5
102.5
102.5
Number of Layers
20
96
96
No. Turns per Layer
166
42
166
Magnet J (A mm-2)*
95.9
114.6
114.6
Magnet Current (A)*
210
210
210
Magnet Self Inductance (H)
3.143
50.813
592.680
Peak Induction in Coil (T)
2.334
3.925
7.427
Magnet Stored Energy (KJ)
69.30
1120.43
13068.59
4.2 K Temp. Margin (K)
3.448
2.690
0.792
Length of conductors per coil (km)
3.916
20.299
80.228
2008-10-19 to 22
ICST/HIT
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MICE/MuCool Coupling Magnets
Load Lines
Conductor Current(A)
800
T=3.4K
T=4.2K
T=5.0K
Test coil 1
Test coil 2
Copling coil
600
575A
400
401A
200
210A
0
0
1
2
3
4
5
6
7
8
9
Magnet Induction in the Conductor (T)
2008-10-19 to 22
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MICE/MuCool Coupling Magnets
Small Coil
The small coil winding, welding of its cold mass assembly and the cryostat
construction for its cryo-test have been done around this June. The connection to
the cryo-test system is expected to be finished around the middle of this Nov.
～DN600*1500
Bayonets
Vacuum
vessel
Cooling tubing
Power leads
Small coil
2008-10-19 to 22
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MICE/MuCool Coupling Magnets
Large Coil Winding
• The winding procedure was approved by LBNL around the middle of this Sept.
• The large coil winding started on Sept.20th and will be finished around Oct.25th.
• There are 4 SC splices in the coil, and 4-sectioned cold diode and resistor quench
protection system is applied. The fiberglass cloth is wrapped every 12 layers of SC
wires. The Catalyst 23LV (low viscosity) is used.
2008-10-19 to 22
ICST/HIT
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MICE/MuCool Coupling Magnets
Quench Protection Assembly for Test Coils
For small coil, 2-section of quench protection circuit consisting of cold diodes and
resistors is to be applied. For large coil, 4-section is to be used. The resistor is sized
as 6mΩ. The quench protection assembly is under fabrication.
QPAssembly for large coil
2008-10-19 to 22
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MICE/MuCool Coupling Magnets
Tests for SC Joints
• There will be 11~12 SC splices in one coil.
• The up-down overlap joint with 96Sn-3.5Ag-0.5Cu soft solder is to be applied at the
ends of the large test coil and the coupling coils.
• The resistance per splice made by ICST has been tested < 5 n even under the
magnetic field of 5T at 4.2K.
• The SC splice tensile strength was tested at LN2 temperature, which is >500MPa.
Up-down joints
Current
Flow
b
Test facility
2008-10-19 to 22
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MICE/MuCool Coupling Magnets
• The tensile test results of SC wires at 300 K
Sample
Ultimate strength （MPa）
Yielding strength （MPa）
ε(%)
No. 1
553.1
330.6
3.923
No. 2
551.3
361.4
1.920
No. 3
550.9
330.2
5.096
• The tensile test results of SC splices at 300 K
Splice
Joint length （mm）
Ultimate strength （MPa）
No. 1
267
557.4
No. 2
271
535.7
No. 3
270
518.2
• The tensile test results of SC splices at 77 K
Splice
Joint length（mm）
Ultimate strength （MPa）
No. 1
255
536.0
No. 2
250
537.7
No. 3
251
530.2
2008-10-19 to 22
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MICE/MuCool Coupling Magnets
Cryo-Test System
• To provide the cooling capacity at
4.2K for performance tests of test
coils and MICE/MuCool coils
• It mainly consists of the TCF20s
refrigerator, 500L LHe dewar, control
valve box, cryostats for test coils
and MuCool/MICE coils, transfer
lines, GHe
recovery/purification/storage
system, vacuum pumping system
etc.
• Most parts have been fabricated,
and are under assembly.
• 500L LHe has been filled into the
30m3 GHe tank on Oct. 10th.
• The cryo-test system is expected to
be ready for coil test around the
middle of this Nov.
2008-10-19 to 22
Large coil
Small coil
MuCool/MICE coils
ICST/HIT
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MICE/MuCool Coupling Magnets
Cryo-valves
Control valve box
2008-10-19 to 22
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MICE/MuCool Coupling Magnets
Large cryostat was
contracted out at the
early of this Sept., and
is scheduled to be
done at the end of Oct.
Bayonets
Power leads
～DN2100*1500
304 S.S.
Φ1500/MICE/MUCOOL coil
2008-10-19 to 22
QPAssembly for large coil
Large cryostat
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MICE/MuCool Coupling Magnets
Transfer lines
2008-10-19 to 22
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MICE/MuCool Coupling Magnets
• Due to high magnetic field of the coupling
coil, performance (such as forward
voltage etc.) of cold diodes at low
temperature and at high magnetic field
(2~3T) must be tested in order to design
quench protection circuit, charging and
fast discharging system before they are
installed inside the magnet. The test at
low temperature is planned by the end of
Oct.
2008-10-19 to 22
Test dewar for diodes
ICST/HIT
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MICE/MuCool Coupling Magnets
Updated Design of MICE/MuCool Coupling Magnets
 Cold mass supports
•
The cold mass support will be a double-band type considering 500kN force in the
longitudinal direction at the worst case, 2g~3g shipping load in any direction, heat
leak restriction, and available space inside the cryostat.
 Vacuum chamber of cryostat
•
The design of the outer vacuum chamber of magnet cryostat and warm end
connections of cold mass supports will be modified according to final doubleband structure of cold mass supports and RFCC module interface.
 Drop-in mode cryocoolers and cooling connections
•
The drop-in mode cryocoolers are to be adopted for the coupling magnets
considering easy assembly and disassembly during long distance transportation,
and cooler maintenance.
•
The cooling connections between the cold heads of the coolers and the current
leads, and between the cold heads and the heat shields have to be updated
accordingly.
2008-10-19 to 22
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MICE/MuCool Coupling Magnets
Double-band support design
Drop-in mode cryocoolers and
cooling connections
2008-10-19 to 22
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MICE/MuCool Coupling Magnets
 Cold mass assembly
Original design
New design
In order to mount the strong cold mass support bases, to reduce the possibility of SC
wires damaged by cold mass welding process, and to provide space for mounting 8section quench protection diodes and resistors etc., the cold mass assembly design of
the coupling magnet is to be updated, as well as the quench protection assembly.
2008-10-19 to 22
ICST/HIT
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MICE/MuCool Coupling Magnets
WBS for Test Coils and the MuCool Coil

Large test coil winding
By 10/25

Performance test for diodes at low temp.
By 10/31

Fabrication of test cryostat for large coil
By 10/31

Construction of test station for small coil
By 11/15

Assembly of large coil cold mass
By 11/22
to weld cover plate/cooling tubing/helium vessel, leakage check, to install quench
protection circuit and instrumentation, etc.

Cryo-test for large coil

To update design of MuCool/MICE coupling magnets

Review on test coils and updated design of MuCool/MICE coupling magnets
Expected to start on 11/24
By 11/30
12/06 to 12/08
2008-10-19 to 22
ICST/HIT
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MICE/MuCool Coupling Magnets

Fabrication of MuCool coil mandrel
By 01/05/09

Winding of MuCool Coil
By 02/28/09

Assembly of MuCool coil cold mass
By 03/31/09
to weld cover plate/cooling tubing/helium vessel, leakage check, to install quench
protection circuit and instrumentation, etc.

Cryo-test of MuCool coil cold mass
By 04/30/09

Assembly of MuCool magnet cryostat
By 07/09/09

Cryo-test of MuCool magnet
By 07/31/09

Two MICE magnets
By 12/31/09
Status of Funds

HIT has provided 1.5 million Yuan (RMB) funding for the MICE CC project till
this July, which was spent on construction of two test coils and cryo-test
system, and will be used for fabrication of the MuCool coupling magnet.

ICST will submit another ~1.0 million Yuan (RMB) funding application
proposal to the HIT for fabrication of two MICE magnets at the early of 2009.
2008-10-19 to 22
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MICE/MuCool Coupling Magnets
Icst.hit.edu.cn
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2008-10-19 to 22
ICST/HIT
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