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Brad Moore M.S. Student Room: 1337 507 884 9258 Hometown: Rochester, MN

Brad Moore M.S. Student Room: 1337 507 884 9258 Hometown: Rochester, MN. Thesis: Development of a Passive Check Valve for Cryogenic Applications. Background. Astrophysics missions employing Microcalorimetry and Transition edge sensors have a need for sub-Kelvin (<1K) cooling.

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Brad Moore M.S. Student Room: 1337 507 884 9258 Hometown: Rochester, MN

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  1. Brad Moore M.S. Student Room: 1337 507 884 9258 Hometown: Rochester, MN • Thesis:Development of a Passive Check Valve for Cryogenic Applications

  2. Background • Astrophysics missions employing Microcalorimetry and Transition edge sensors have a need for sub-Kelvin (<1K) cooling. • A Cold Cycle Dilution Refrigerator (CCDR) provides an alternative to the current space based sub-kelvin cooling - Adiabatic Demagnetization Refrigerators or LHe3 Cryostats. • The CCDR provides cooling through the endothermic mixing of He3-He4 isotopes at low temperatures. • A reversible paramagnetic pump drives the flow through the cycle, however the flow provided is oscillating and must be rectified through the use of check valves.

  3. Objectives • Development, fabrication and testing of a check valve for use in the CCDR. • Requirements: • Passive – no electric or mechanical actuation • Operate at low temperatures (~1.8 K) with a mixture of He3-He4. • Seal at low back pressures (~3psi) • Negligible cracking pressure required to open

  4. Check Valve Teflon seat reed check valve currently being refined and tested.

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