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SCU1 Vertical Test Results
Matt Kasa9/16/2014
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Vertical Cryostat Assembly
• Coil Training• Record the current decay and the terminal voltage
across the coils during a quench• Hot spot temperature estimate derived from the
current decay and MIITs
• Hall Probe field scans for preliminary magnetic measurements• Carbon fiber guide tube in the gap of the magnet• Cloth bellows attached to the vertical stage, ices up
during a scan• Field scans were performed after training the magnets
Period length mm 18
Periods N 59.5
Magnetic length m 1.07
Magnetic gap mm 9.5
Conductor Diameter mm 0.6
SCU1 Parameters
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Coil Training
• Both main coils trained to 580 A, same Ic as the short prototypes
• Core 1 – 67 training quenches• Core 2 – 140 training quenches• MIITs hot spot temperature estimation with
cores wired in series was ~60 K• Maximum voltage at terminals with cores
wired in series was ~120 V
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400 A Main, 0 A Correction
• Final 1st integral is ~-750 G-cm. Equivalent to a dipole field of -5.7 G• Final 2nd integral ~400 kG-cm^2• S-shaped trajectory due to no correction current
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400 A Main, 24 A Correction
• Offset added to the field to compensate for apparent dipole, therefore 1st integral is 0• S-shaped trajectory is fixed by correction coils, but the offset cannot be fully corrected while keeping a straight trajectory
• Due to 1018 steel used for the core, 1006 will be used in the future
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• Field integrals scale with main current• Absolute values are uncertain, will be measured
with rotating coil in horizontal measurement system
• Phase errors are low without shimming• Had a 500 A scan with ~3.2 deg. RMS
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1st Integral Correction• Unclear what causes the dipole field• A pair of coils will be installed above the top core and below the bottom core to provide a means for
correction• 20 turns of superconductor with 20 A of current results in ~10 G dipole field
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2nd Integral Correction• SCU1 needs to use external correctors – plan is to install
correction coils upstream and downstream of the device inside the cryostat• 130 turn racetrack coil, 22 AWG with a 25 mm iron core • 1340 G at 4 A• Tied to the 1st Stage cooling circuit
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Magnetic Gap• Magnetic gap increases towards the ends of the device
• Magnetic measurements indicate that the gap is ~0.1 mm larger
• An attempt will be made to adjust the thickness of the gap spacers to create a more uniform gap
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Summary• The two cores reached the same critical current as the short prototypes
• The SCU1 preliminary magnetic measurements are very encouraging
• Low phase errors appear to be achievable without the need for shimming
• The 1st and 2nd integrals can be corrected with external correction coils
• The uniformity of the magnetic gap will be improved
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Extra Slides
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Inductance and Stored Energy
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Effect of the Cooling Channel and Low Carbon Steel
• 2d simulations of the magnet assembly in FEMM• 1018 LCS
• No channel• 19 mm• 25.4 mm
• 1006 LCS• No channel• 19 mm• 25.4 mm
• Only correction current, no main
Cooling channel
Cooling channel
Top Core
Bot Core
Gap
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Effect of the Cooling Channel and Low Carbon Steel – Correction Field
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Effect of the Cooling Channel and Low Carbon Steel – Correction Field Integral