ncsx operation of the c1 modular coil in the coil test facility peer review june1, 2006 ncsx
TRANSCRIPT
NCSX
Operation of the C1 Modular Coil in the Coil Test Facility
Peer Review
June1, 2006
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June 1,2006 2
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C1 Operation Review Objective
• The objectives of this review are to consider:
– Installation of the C1 in the CTF
– Instrumentation and Data Acquisition
– Test Plan
June 1,2006 3
NCSXClose Quarters
The New Cryostat Mostly Fills The Test Enclosure
June 1,2006 4
NCSXES&H Changes
• Magnetic field exposure for personnel is slightly higher for the C1 test. The barrier distance increases from 15 feet to 23 feet.
• The C1 cryostat is large enough to impede access to and egress from the test enclosure. Three access doors allow entrance to the enclosure with necessary procedure changes (RLM: von Halle).– May become classified as a Confined Space
June 1,2006 5
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C1 Installation
• 304 stainless steel legs (SE144-030)for strength– One leg fixed in
X&Y, three on roller supports
• EM loads on baseplate for boil-off reservoir require tie-downs
June 1,2006 6
NCSXCoil Flow Diagram
The C1 Coil Has Been Plumbed As 9 Separate Single-Phase Flow Paths
and
One Two-Phase Supply For The Lead Block Bleeds
June 1,2006 7
NCSXThe Plumbing B-Plan
• Teflon tubing with Swagelok joints and custom backing inserts were not reliable– 40 psig was the best pressure achieved– The previous style of insulating G-10 pipe
nipples will be used in the plumbing
June 1,2006 8
NCSXBus Conductor
500 MCM Welding Cable Insulated with Teflon FEP Shrink Tubing Has Successfully Been Tested to 58 kV
June 1,2006 9
NCSXBus Bracing
A Robust Support Has Been Fabricated To Both Partially Relieve The Leads From Load And To React Bus-Bus Forces
Clamping force of 11300 N/m or 65 lbf/in is required on close conductors
D. Williamson has asserted that the coil leads are not particularly fragile
June 1,2006 10
NCSXLead Insulation
• Maximum voltage across coil is expected to be approximately 499 volts – The G11CR lead sleeves designed and
machined for the production coils are being used for this test set-up
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NCSXTest Objectives
• Main purpose – calibrate FE models with actual data– Improves confidence with which models can
be used for future what-if inquiries.
• Secondary purpose – assess cooldown/recovery performance from ambient temperature and after pulses
June 1,2006 19
NCSXDimensional/Deflection Measurements
• 3 measurement approaches
– Extensive strain gauge array
– Mechanical displacement measurement
– Manual measurement of total width of both winding packs before and after
June 1,2006 20
NCSXStrain Gauge Locations
• 15 of K. Freudenberg’s 20 requested locations are instrumented
June 1,2006 21
NCSXMechanical Measurement
Box Dimensions are 94” X 116.5” ID with wall thickness of 6”
Three tubes needed
1. 9.5 foot outer tube ss tube, .875 OD, .675” ID. (purchased)
2. 8 inch ss tube (box entrance) .75” OD, .6875” ID
3. 10 foot inner ss tube ¼ diameter
Three angles needed (2” X 3”) (.1875 thick). These may be from local boat supply store. (Tentatively purchased two anchors.)
June 1,2006 22
NCSXThermal Measurements
• Extensive strain gauge and t/c data collection system
• V/I resistance inference– This is a key feature as it is prototypical of the
first-plasma machine protection scheme– ADMINISTRATIVE control of coil temperature
through resistance value (wait for next pulse until cool)
June 1,2006 23
NCSXTemperature Differentials
• Fiberglass convection insulation will be installed on coil with fiberglass rope
• Only outer aspect of coil will be exposed to cooling
• Two T/C’s will be installed near the winding packs on coolant tubes. The resulting temperatures will be used to monitor the deltaT between the windings and the MCWF.
• A 50C difference has been recommended.
June 1,2006 24
NCSXTest Sequence
– Lift the both ends of the cable bus assembly and megger pole-pole to 3 kV
– Restore the bus at the coil end and megger the warm coil to ground to 7.5 kV
– Completely restore the bus and measure the warm circuit resistance from the rectifier room
– Collect winding pack width data prior to cool-down– Cool the coil to ~80K with proper data collection
June 1,2006 25
NCSXTest Sequence (cont.)
– Measure the cold circuit resistance from the rectifier room
– Perform basic shot sequence with T/C, strain archival and V/I cooldown checks
– Warm up to install mechanical measurement rig– 5 kA room temperature pulse for K.F. – Cool down, repeat shot sequence, collect previous
data plus displacements– Warm up facility– Measure final winding pack dimensions
June 1,2006 26
NCSXCurrent Waveforms for Test
C1 Waveforms
0
5000
10000
15000
20000
25000
30000
35000
40000
-1 -0.5 0 0.5 1 1.5
Time (seconds)
Cu
rren
t (a
mp
eres
)
Series1
Series2
Series3
Series4
The 2T Scenario from the Rev. 4 GRD offers 36.5 kA with
an I**2t of 1.15e9 a**2sec.
June 1,2006 27
NCSXProtective Circuitry
• Protective Settings– Maximum “On” time – 2.3 seconds - no
change from TRC– Tau (thermal) – 200 seconds – no change– Minimum cycle time – 900 seconds – no
change– I**2t max – 1.6e9 a**2sec – no change– Imax – 38.5 kA up from 33 kA
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