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The 23rd MICE Collaboration Meeting
Large Prototype Coil Test and Plan
2009-01-15
Fengyu Xu
Institute of Cryogenics and Superconductivity Technology
Harbin Institute of Technology, Harbin, China
Jan.13 to 17, Harbin/China
ICST/HIT
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The 23rd MICE Collaboration Meeting
Content
• Fabrication of Large Prototype Coil
• Test for Large Prototype Coil
• Next Plan for Large Coil Test
Jan.13 to 17, Harbin/China
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The 23rd MICE Collaboration Meeting
Fabrication of Large Prototype Coil
Winding System
•
Automatic guider made operation easier.
•
Tension control configuration is effective
during all operation processes.
Tension regulator
•
Winding system can be re-configured to
facilitate the cover-plate-welding
procedure.
Guider
Tension
holder
Dereeler
Storage spool
Winding machine
•
Winding system can run either in forward or backward directions, which makes it possible and easy
for winding the conductor joints into the coil and welding the cover plate to the coil mandrel.
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The 23rd MICE Collaboration Meeting
Winding Procedure
•
Wet-winding technology was adopted for the
large coil by ICST.
•
Coil test technology (resistance, coil-to-ground
insulation, layer diameter etc.) during the
winding process was studied and improved with
different methods and the method to be used for
MuCool coil winding was determined then.
•
Making and winding technology of conductor
joints were developed and applied for the large
prototype coil.
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The 23rd MICE Collaboration Meeting
Cover-Plate-Welding Procedure
•
Procedures and parameters for coil cold mass assembly
welding were studied.
•
MIG technology was adopt for welding of cover plate and
cooling tubing. TIG was used for helium vessel welding.
•
Pre-heating to the whole coil assembly before performing
the welding was controlled in the range of 60oC~80oC.
•
Water cooling was used to limit the mandrel’s
temperature around the welding spots so as to protect
the coil temperature from above 130oC.
•
The measured temperature on the mandrel surface of the
nearest spot to the coil was less than 90oC during the
welding.
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The 23rd MICE Collaboration Meeting
Comments
 A winding system was developed and continuously improved during test coils’
winding.
 Wet-winding technology was adopted for large coil, and all the materials used
for the winding were verified.
 SC joints making and winding technology was developed, and there are 4
joints with overlapping length of 1 m wound into the large coil at the both coil
ends.
 Four-sectioned passive quench protection circuit was adopted in the large coil.
 Cover-plate-weld procedure was studied and performed in order to protect the
coil temperature from above 130oC.
 In-direct cooling method is used for the large coil through cooling tubing.
 All technologies that were developed and adopted in the large prototype coil
will be validated by large coil test results.
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The 23rd MICE Collaboration Meeting
Test for Large Prototype Coil
Expected Testing Results
•
Magnet training process will be performed and it is expected that the maximum
energizing current can reach at 350~400A, then the coil stress can reach at a
level of the coupling coil based on the calculations.
•
The quench protection assembly and superconducting interleads, that were
designed with thermal conductive cooling, will be expected to effectively work
at different operation phases, e.g., charging, discharging, normal operation,
and quench.
•
Current decay and voltages in quench process will be measured.
•
The main parameters of large coil, e.g. self-inductance, mutual inductance, and
relationship of central magnetic field vs. current are expected to be measured.
•
For back-to-back diode pair operated at 4.2K, their leakage currents at different
voltages will be expected to be measured in charging and discharging phases.
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The 23rd MICE Collaboration Meeting
Progress on Test Preparation – Cold Mass and Testing Cryostat
•
Cold mass pre-mounting was done.
•
Vacuum-leakage check of vacuum
vessel was performed and bayonet
O-ring leak was found and fixed.
•
An additional copper plate and
cooling tube will be mounted at the
cold ends of current leads to
increase cooling area based on
calculation.
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The 23rd MICE Collaboration Meeting
Progress on Testing Preparation – Cryogenic Control System
Temperature
Monitor
LabVIEW
SC Level
Monitor
Dual-channel
Vacuum Monitor
PLC Modules
VISA
server
RS-232 Serial
Interface
OPC server
MPI field bus
Model 218
Cryo-temperature
sensors
Jan.13 to 17, Harbin/China
Run-time
database
PLC
Pressure, level, vacuum,
temperature, control valve,
on-off valve, voltage
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The 23rd MICE Collaboration Meeting
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The 23rd MICE Collaboration Meeting
Progress on Testing Preparation – Magnet Monitoring System
•
•
•
We have two power supplies can be used to energize the magnet.
Rapid discharge circuit is canceled in order to avoid passive quench
protection circuit break-over, and the protective diode of power supply will be
a part of circuit in discharging phase.
Considering fault modes, e.g. power failure and refrigerator failure, a switch is
put into the circuit loop, and an UPS is required.
CLP
R1
D1
V1
-
Rapid discharge circuit
+
+
-
D2
V9
V5
R2
D3
R
D4
V3
V10
V6
R3
D5
D6
V11
V7
R4
V2
D7
K
D8
V12
V8
CLN
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The 23rd MICE Collaboration Meeting
LabVIEW
SC Level
Monitor
Slow Data
Storage
Fast Data
Storage
Field DAQ
DAQ Card
Programmer
Field DAQ
Programmer
Power supply
Magnet
Jan.13 to 17, Harbin/China
Power Supply
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The 23rd MICE Collaboration Meeting
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The 23rd MICE Collaboration Meeting
Next Plan for Large Coil Test
It is expected that
•
To complete software and hardware commissioning of magnet monitoring
system by Jan. 18, 2009
•
To complete quench protection assembly test and to mount it onto the cold
mass by Jan. 22, 2009
•
To complete current lead modification, connecting cooling tubes inside test
cryostat and checking vacuum leakage by Jan. 24, 2009
•
To submit LBNL the test procedure for large coil for approval by Feb. 8, 2009
•
To complete mounting temperature sensors, voltage taps and feed-through by
Feb. 9, 2009 (from Jan. 25 to Jan. 31 is Chinese Spring Festival)
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The 23rd MICE Collaboration Meeting
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To complete cryostat assembly and vacuum/helium leak check by Feb. 15, 2009
•
To complete all preparation work for starting up refrigerator (piping connection,
helium leakage check, purge and pumping etc.) by Feb. 25, 2009
•
To start the cool down for the refrigerator system and large coil test system from
Feb.26, 2009 to Mar. 3rd, 2009
•
To perform the test (charge, training, discharge, etc.) during the period from Mar.
3rd to Mar. 8, 2009
•
To submit LBNL the test results around the middle of March, 2009
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The 23rd MICE Collaboration Meeting
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Jan.13 to 17, Harbin/China
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