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CEC-ICMC 2019 - Abstracts, Timetable and Presentations

21–25 Jul 2019
Connecticut Convention Center, Level 6
US/Eastern timezone

Conference Management

Session

C3Or1A - Superfluid Helium

C3Or1A
24 Jul 2019, 11:00
Level 6, Room 22-23

Level 6, Room 22-23

Conveners

C3Or1A - Superfluid Helium

  • Michael DiPirro (NASA - Goddard Space Flight Center)
  • John Weisend (European Spallation Source ESS AB)

Presentation materials

There are no materials yet.

  1. 1013. C3Or1A-01: Development of a Helium-3 Cryostat for Ultra-Cold Neutron Source
    Dr Shinsuke Kawasaki (KEK)
    24/07/2019, 11:00
    Contributed Oral Presentation

    Ultra-cold Neutrons (UCNs) are extremely slow neutrons of which the kinetic energy is below several hundred neV. As a consequence, UCNs are totally reflected at the surface of certain materials and can be confined in a material bottle. Using this unique property, UCNs are used for various experiments such as neutron electric dipole moment searches, neutron lifetime measurements, and gravity...

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  2. 1001. C3Or1A-02: Thermo-Fluid Analyses and Experiments for UCN Cryogenic System
    Dr Takahiro Okamura (KEK)
    24/07/2019, 11:15
    Contributed Oral Presentation

    Cold neutrons are down-scattered by isopure superfluid 4He (IPHe-II) with around 0.8 K to become ultra-cold neutrons (UCN). The UCN lifetime strongly depends on the temperature of the IPHe-II. During the beam operation, temperature of the IPHe-II gradually increasing from 0.8 K due to the dynamic heat load. The TUCAN collaboration is now developing the new cryogenic system. There are mainly...

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  3. 663. C3Or1A-03: Quench spot detection for SRF cavities via flow visualization in superfluid helium-4
    Dr Shiran Bao (National High Magnetic Field Laboratory)
    24/07/2019, 11:30
    Contributed Oral Presentation

    Superconducting ratio-frequency (SRF) cavities, cooled by superfluid helium-4 (He II), are key components in modern particle accelerators. Quenches in SRF cavities caused by Joule heating from local surface defects can severely limit the maximum achievable accelerating field. Existing methods for quench spot detection include temperature mapping and second-sound triangulation. These methods...

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  4. 980. C3Or1A-04: Comparative study of heat transfer performance and visualization images of superfluid helium boiling in narrow two-dimensional channel
    Dr Suguru Takada (National Institute for Fusion Science)
    24/07/2019, 11:45
    Contributed Oral Presentation

    In a narrow channel, boiling heat transfer in He II is much different from that in the case of an open bath. Even under saturated pressure condition, rapid temperature rise due to the onset of film boiling is not seen when the bath temperature reaches the lambda temperature, but only temperature oscillation is detected. The behavior of this state looks like the nucleate boiling, though it is...

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  5. 1022. C3Or1A-05 [Invited]: Numerical modeling of a sub-Kelvin Active Magnetic Regenerative Refrigeration Cycle
    Chloe Gunderson (University of Wisconsin-Madison)
    24/07/2019, 12:00
    Invited Oral Presentation

    Continuous and efficient sub-Kelvin cooling for uninterrupted operation of cutting edge detectors, both in space and on the ground, is critical for top performance in many NASA missions. The development of a sub-Kelvin Active Magnetic Regenerative Refrigerator (AMRR) will provide distributed and continuous sub-K cooling to space instrumentation via circulation of a 3He-4He mixture. This system...

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