NCSX Operation of the C 1 Modular Coil

NCSX Operation of the C 1 Modular Coil in the Coil Test Facility Peer Review June 1, 2006

C 1 Operation Review Objective NCSX • The objectives of this review are to consider: – Installation of the C 1 in the CTF – Instrumentation and Data Acquisition – Test Plan June 1, 2006 2

NCSX Close Quarters The New Cryostat Mostly Fills The Test Enclosure June 1, 2006 3

NCSX ES&H Changes • Magnetic field exposure for personnel is slightly higher for the C 1 test. The barrier distance increases from 15 feet to 23 feet. • The C 1 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 4

C 1 Installation NCSX • 304 stainless steel legs (SE 144 -030)for strength – One leg fixed in X&Y, three on roller supports • EM loads on baseplate for boil-off reservoir require tiedowns June 1, 2006 5

NCSX Coil Flow Diagram The C 1 Coil Has Been Plumbed As 9 Separate Single-Phase Flow Paths and One Two-Phase Supply For The Lead Block Bleeds June 1, 2006 6

NCSX The 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 7

NCSX Bus Conductor 500 MCM Welding Cable Insulated with Teflon FEP Shrink Tubing Has Successfully Been Tested to 58 k. V June 1, 2006 8

NCSX Bus Bracing A Robust Support Has Been Fabricated To Both Partially Relieve The Leads From Load And To React 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 9

NCSX Lead Insulation • Maximum voltage across coil is expected to be approximately 499 volts – The G 11 CR lead sleeves designed and machined for the production coils are being used for this test set-up June 1, 2006 10

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NCSX Test 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 18

NCSX Dimensional/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 19

NCSX Strain Gauge Locations • 15 of K. Freudenberg’s 20 requested locations are instrumented June 1, 2006 20

NCSX Mechanical 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 4. Three angles needed (2” X 3”) (. 1875 thick). These may be from local boat supply store. (Tentatively purchased two anchors. ) June 1, 2006 21

NCSX Thermal 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 22

NCSX Temperature 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 delta. T between the windings and the MCWF. • A 50 C difference has been recommended. June 1, 2006 23

NCSX Test Sequence – Lift the both ends of the cable bus assembly and megger pole-pole to 3 k. V – Restore the bus at the coil end and megger the warm coil to ground to 7. 5 k. V – 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 ~80 K with proper data collection June 1, 2006 24

NCSX Test 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 k. A 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 25

NCSX Current Waveforms for Test The 2 T Scenario from the Rev. 4 GRD offers 36. 5 k. A with an I**2 t of 1. 15 e 9 a**2 sec. June 1, 2006 26

NCSX Protective 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**2 t max – 1. 6 e 9 a**2 sec – no change – Imax – 38. 5 k. A up from 33 k. A June 1, 2006 27

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