Superconducting Superconducting Solenoid PunchSolenoid Punch

Team SupercoolTeam SupercoolAndy LinAndy Lin

Chris KinneyChris KinneyNaomi KohenNaomi KohenDavid SchoenDavid Schoen

Superconducting Superconducting ActuatorActuator

Zero resistance at low Zero resistance at low TT Electrical actuator:Electrical actuator:

Electrical Electrical EE Mechanical Mechanical EE American SuperconductorAmerican Superconductor Goal: HTS solenoid punchGoal: HTS solenoid punch

Why superconducting?Why superconducting?

Low resistance Low resistance Higher efficiency Higher efficiency

Higher current density Higher current density Larger field Larger field

Fewer turns Fewer turns Simple design and Simple design and manufacturingmanufacturing

Superconductor PhysicsSuperconductor Physics

Impenetrable by external magnetic fields Impenetrable by external magnetic fields (up to a point)(up to a point)

Type I & II SuperconductorsType I & II Superconductors

Cooper PairsCooper Pairs

BSSCO 2223: Our TapeBSSCO 2223: Our Tape

Provided by Provided by American American SuperconductorSuperconductor

4 mm (w) x 0.21mm 4 mm (w) x 0.21mm (t)(t)

Critical Current Critical Current rating 85 – 108 Arating 85 – 108 A

Critical Temp (TCritical Temp (Tcc) ) 110K110K

Currently 2 pieces; 4 Currently 2 pieces; 4 and 50 m longand 50 m long

BSSCO 2223: BSSCO 2223: IICC vs. vs. HH

The PunchThe Punch

Use solenoid for Use solenoid for magnetic fieldmagnetic field

An iron core An iron core accelerates in the fieldaccelerates in the field

A strong field will A strong field will produce a significant produce a significant force.force.

Coil DimensionsCoil Dimensions

Inner Coil between 50 mm and 100 Inner Coil between 50 mm and 100 mm in diametermm in diameter

Coil height approximately 75mmCoil height approximately 75mm

Between 320 and 160 turns with 50 Between 320 and 160 turns with 50 meters of wiremeters of wire

Critical Current SetupCritical Current Setup

Critical Current Critical Current MeasurementsMeasurements

Voltage vs. Current

0.01

0.1

1

10

0 50 100 150

Current (A)

Voltage (

mV

)

Trial 1, 77K, 2/28/04

Trial 2, 77K, 2/28/04

Trial 3, 77K, 3/2/04

Coil Radius SetupCoil Radius Setup

Coil Radius Coil Radius MeasurementsMeasurements

Voltage vs. Current

0.001

0.01

0.1

1

0 50 100 150

Current (A)

Vo

lta

ge

(m

V)

Trial 1Trial 2

The ApparatusThe Apparatus

The ApparatusThe Apparatus

Materials ChoiceMaterials Choice PVCPVC

InexpensiveInexpensive MachinableMachinable DiamagneticDiamagnetic

AlAl InexpensiveInexpensive Easily MachinableEasily Machinable ParamagneticParamagnetic DurableDurable

EstimatesEstimates

Displacement (m)

Forc

e (

N)

0.1 0.2 0.3 0.4

100

200

300

400

EstimatesEstimates

0.1 0.2 0.3 0.4

20

40

60

80

100

120

Forc

e (

N)

Displacement (m)

ComparisonsComparisons

Future ConsiderationsFuture Considerations

Running colder than 77KRunning colder than 77K Making a taller or shorter coilMaking a taller or shorter coil Punch striking surfacePunch striking surface Punch shapePunch shape Retraction MechanismRetraction Mechanism Pulse (with capacitor)?Pulse (with capacitor)?

TestsTests

Obtain comparable copper solenoidObtain comparable copper solenoid

Magnetic fieldMagnetic field

ForceForce

Energy density per massEnergy density per mass

ScheduleSchedule

Questions?Questions?

Calculating ForceCalculating Force

For LoopFor Loop

Force:Force:

Magnetization of Iron: Magnetization of Iron: 334225 A/m334225 A/m

23

22

2

)(2 xr

NIrB

dxBMAdF