critical current probe
DESCRIPTION
Team 16. Critical Current Probe. Amy Eckerle Andrew Whittington Philip Witherspoon. Mid-Point Review. NHMFL Applied Superconductivity Center. The Project. - PowerPoint PPT PresentationTRANSCRIPT
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Critical Current ProbeMid-Point Review
Amy EckerleAndrew Whittington
Philip Witherspoon
Team 16
NHMFLApplied Superconductivity Center 1
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The ProjectModify existing cryostat probe to conserve the amount of
liquid helium, $5/liter of liquid He, used during a critical current measurement test.
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Current Leads
Helium level
Cryostat
Voltage tap
MagnetSample
Voltage tap wire
Stainless Steel Jacket
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Constraints
• Constraints– Test 6-8 samples– Budget of $4000– Constant casing diameter– Minimum length to reach center of cryostat
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HTS Leads and supportSolutions
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• Poor Conductor of heat• Low thermal conductivity with
high electrical conductivity• Great reduction in copper surface
area• Prevents copper leads from
entering liquid helium bath
G10 Support
HTS Lead
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Number of LeadsSolutions
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• Leads are major heat leak• Maintain 8 samples
with 6 leads
Current Leads
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Jacket DesignSolutions
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Current Leads
Stainless steel portion
G10 portion
•interrupts thermal conduction of the stainless steel tube
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Problems
• Re-design was needed for HTS leads protection
• Previous design of sample holder was impractical– New design was made
• Ordering Problems
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HTS Section
• High Temperature Superconducting– Eight tapes will be stacked– Reduce surface area
• Most important section• Fragile
Copper Lead HTS Lead8
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HTS ProtectionNo HTS Protection• Free hanging, fragile wires• Susceptible to twisting and pulling• Low durability
Protection Requirements• Protect HTS leads • Allow for thermal contraction
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HTS ProtectionSpacers• Keeps rods from swinging or touching• Have holes drilled for voltage taps,
copper leads, and support rods• Will connect to G-10 casing via holes
screws
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HTS ProtectionG-10 Support Rods• Prevents rods from twisting • Screwed into top spacer• Clamp placed on bottom spacer will
allow for upward motion
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HTS ProtectionG-10 Casing• Adds durability• Prevents bending
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Sample Holder Redesign
• Reduction in leads required new design
• New design features– Avoidance of bending copper– Using 6 current leads for 8
samples– Mounting for spiral sample
• Need to order copper for sample holder
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Parts en Route
• 8 ft current leads (qty. 6)• Current connects (qty. 6) • Copper for sample holder• G-10 Rods (qty. 4)• Stycast
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MachiningParts Needing Machining• Sample holder• Copper leads• Current connects
Parts Undergoing Machining• G-10 top flange• Spacers• Jacket welding• Guide• Connector
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MachiningParts Needing Machining• Sample holder• Copper leads• Current connects
Parts Undergoing Machining• G-10 top flange• Spacers• Jacket welding• Guide• Connector
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MachiningParts Needing Machining• Sample holder• Copper leads• Current connects
Parts Undergoing Machining• G-10 top flange• Spacers• Jacket welding• Guide• Connector
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MachiningParts Needing Machining• Sample holder• Copper leads• Current connects
Parts Undergoing Machining• G-10 top flange• Spacers• Jacket welding• Guide• Connector
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MachiningParts Needing Machining• Sample holder• Copper leads• Current connects
Parts Undergoing Machining• G-10 top flange• Spacers• Jacket welding• Guide• Connector
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MachiningParts Needing Machining• Sample holder• Copper leads• Current connects
Parts Undergoing Machining• G-10 top flange• Spacers• Jacket welding• Guide• Connector
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MachiningParts Needing Machining• Sample holder• Copper leads• Current connects
Parts Undergoing Machining• G-10 top flange• Spacers• Jacket welding• Guide• Connector
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MachiningParts Needing Machining• Sample holder• Copper leads• Current connects
Parts Undergoing Machining• G-10 top flange• Spacers• Jacket welding• Guide• Connector
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MachiningParts Needing Machining• Sample holder• Copper leads• Current connects
Parts Undergoing Machining• G-10 top flange• Spacers• Jacket welding• Guide• Connector
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Testing
• Testing can only occur when the final design has been completely finished
• Place probe in existing cryostat for regular testing
• Compare helium losses with the existing design
• Comparing weight
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Questions?
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