The potential use of the ltmpf for fundamental physics studies on the iss
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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

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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)PM: 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?

  • 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?

  • 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

  • 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

  • Sharp superfluid helium transition

Space

Ground

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


Justification for low temp

Justification for Low Temp.

Lower noise Sensitive SQUID technology

High Resolution Thermometer

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


Ltmpf payload overview

LTMPF Payload Overview

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

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


Ltmpf payload overview3

LTMPF Payload Overview


Helium tank overview

Helium Tank Overview


Cryo insert overview

Cryo-Insert Overview


Probe description

Probe Description


Probe description1

Probe Description

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


Magnetic shields

Magnetic Shields


Charcoal adsorption pump

Charcoal Adsorption Pump


Ltmpf current status

LTMPF Current Status

  • 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

  • Major EM Electronic Boards Fabricated and Tested.


Ltmpf current status2

LTMPF Current Status

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


Experiments lined up to use ltmpf

Experiments Lined Up to use LTMPF

  • DYNAMX/CQPI: R. Duncan / D. Goodstein

  • MISTE/COEXPI: M. Barmatz / I. Hahn

  • SUMOPI: J. Lipa

  • ISLEPI: H. Paik

  • EXACTPI: M. Larson/N. Mulders

  • BESTPI: G. Ahlers/F. C. Liu

  • SUEPI: J. Lipa


Experiments along coexistence near tricriticality exact

Experiments Along Coexistence Near Tricriticality (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 (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 (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

  • 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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