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The Potential Use of the LTMPF for Fundamental Physics Studies on the ISS. Talso Chui Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 NASA ISS Workshop on Fundamental Physics Dana Point, California October 13-15, 2010.

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The potential use of the ltmpf for fundamental physics studies on the iss
The Potential Use of the LTMPF for Fundamental Physics Studies on the ISS

Talso Chui

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109

NASA ISS Workshop on Fundamental Physics

Dana Point, California

October 13-15, 2010


The low temperature microgravity physics facility ltmpf pm j pensinger dpm f c liu
The Low Temperature Microgravity Physics Facility (LTMPF) Studies on the ISSPM: J. Pensinger DPM: F. C. Liu

  • A multiple-user Facility for scientific research requiring both microgravity and low temperature conditions

  • LTMPF


Why low temperature
Why Low Temperature? Studies on the ISS

  • Low Thermal Noise low noise devices.

  • Superconductivity sensitive instrumentation.

    • Superconducting Quantum Interference Device (SQUID).

    • Ideal Magnetic Shield.

  • Superfluid Helium.

    • Very sharp transition.

    • Ideal model system for phase transition studies.

    • Very high thermal conductivity.


Why microgravity
Why Microgravity? Studies on the ISS

  • Uniform sample for phase transition studies.

  • Free falling test mass for gravitation studies.

    • Only possible for short time in drop towers on Earth.

    • Can be approximated by suspension in direction of g.

      • Need strong spring on Earth.

      • Only very weak spring is need on ISS.

  • Larger velocity modulation for relativity tests.

    • Velocity vector reverse once a day on Earth, once every 90 minutes on orbit.


Heritage
Heritage Studies on the ISS

  • Superfluid Helium Experiment (1985). PI: Peter Mason, JPL

    • Demonstrated containment of superfluid in space.

  • Lambda Point Experiment (1992). PI: John Lipa, Stanford U.

    • Confirmed theory to near 10-9 K of phase transition.

    • First time SQUID was flown.

    • High Resolution Thermometer: 0.26 nK-Hz-1/2 noise.

  • Confined Helium Experiment. PI: John Lipa, Stanford U.

    • Tested phase transition under confinement.

    • Helium confined in 57-μm planar geometry


Justification for microgravity
Justification for Microgravity Studies on the ISS

  • Sharp superfluid helium transition

Space

Ground

Lipa et al., PRL 76, 944 (1996).


Justification for low temp
Justification for Low Temp. Studies on the ISS

Lower noise Sensitive SQUID technology

High Resolution Thermometer

Day et. al, JLTP, 107, 359 (1997).


Ltmpf payload overview
LTMPF Payload Overview Studies on the ISS

Mass: 600 Kg

Volume: 82 x 185 x 104 cm

Cryogen life: 4.5 months on orbit

Power Dissipation: 350 W

2 Cold Instrument Inserts: 15 Kg each.

Payload Bay Access: L-64 hrs.

Shielded Magnetic Field: 10 mGauss

Dewar Temperature: 1.5 K.

# SQUID available: 12 (~6 per user)

Communication Downlink: 0.2 Mbps

Communication Uplink: 0.01 Mbps.


Ltmpf payload overview1
LTMPF Payload Overview Studies on the ISS

Grapple Fixture for robotic transfer from carrier to ISS

FRAM for interface to carrier

PIU for interface to ISS


Ltmpf payload overview2
LTMPF Payload Overview Studies on the ISS


Ltmpf payload overview3
LTMPF Payload Overview Studies on the ISS


Helium tank overview
Helium Tank Overview Studies on the ISS


Cryo insert overview
Cryo-Insert Overview Studies on the ISS


Probe description
Probe Description Studies on the ISS


Probe description1
Probe Description Studies on the ISS

Optional 2-stage configuration for experiments that need more space.


Magnetic shields
Magnetic Shields Studies on the ISS


Charcoal adsorption pump
Charcoal Adsorption Pump Studies on the ISS


Ltmpf current status
LTMPF Current Status Studies on the ISS

  • Major components fabricated.

  • Stored in Flight Certified area in Bldg 79 JPL.

  • All key staff at JPL are still employed on other projects.

    • Available on short notice.

Struts


Ltmpf current status1
LTMPF Current Status Studies on the ISS

  • Major EM Electronic Boards Fabricated and Tested.


Ltmpf current status2
LTMPF Current Status Studies on the ISS

  • All the certification records and analysis reports have been maintained.


Experiments lined up to use ltmpf
Experiments Lined Up to use LTMPF Studies on the ISS

  • DYNAMX/CQ PI: R. Duncan / D. Goodstein

  • MISTE/COEX PI: M. Barmatz / I. Hahn

  • SUMO PI: J. Lipa

  • ISLE PI: H. Paik

  • EXACT PI: M. Larson/N. Mulders

  • BEST PI: G. Ahlers/F. C. Liu

  • SUE PI: J. Lipa


Experiments along coexistence near tricriticality exact
Experiments Along Coexistence Near Tricriticality Studies on the ISS(EXACT)

  • Perform an experimental test of the exact predictions of the theory of phase transitions near the tricritical point of 3He-4He mixtures.

  • Second sound measurements with bolometer.

  • Microgravity justification: Mixture stratifies in gravity.


Superfluid universality experiment sue
Superfluid Universality Experiment Studies on the ISS(SUE)

  • Measure superfluid density in pure Helium by second sound method at different pressures.

  • Test universality of exponents.

  • Microgravity justification: Sample non-uniformity in gravity.


Boundary effects in superfluid transition best
Boundary Effects in Superfluid Transition Studies on the ISS(BEST)

  • Measure Thermal Conductivity in Confined Geometry at different pressures.

  • Test dynamic finite-size scaling theory.

  • Microgravity justification: Sample non-uniformity in gravity.


Conclusion
Conclusion Studies on the ISS

  • Many interesting and important physics experiments can be performed on the ISS if low temperature environment is provided.

  • LTMPF and similar follow-ons can provide this environment.

  • A new generation of students, scientists, engineers and managers are ready to carry on the torch.


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