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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

June 1,2006 11

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June 1,2006 18

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

June 1,2006 28

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