Superfluid Liquid Helium Control for the Primordial Inflation Polarization Explorer Balloon Payload
arXiv:2105.08734 · doi:10.1063/5.0048800
Abstract
The Primordial Inflation Polarization Explorer (PIPER) is a stratospheric balloon payload to measure polarization of the cosmic microwave background. Twin telescopes mounted within an open-aperture bucket dewar couple the sky to bolometric detector arrays. We reduce detector loading and photon noise by cooling the entire optical chain to 1.7 K or colder. A set of fountain-effect pumps sprays superfluid liquid helium onto each optical surface, producing helium flows of 50--100 cm^3 / s at heights up to 200 cm above the liquid level. We describe the fountain-effect pumps and the cryogenic performance of the PIPER payload during two flights in 2017 and 2019.
23 pages including 14 figures, accepted for publication in Review of Scientific Instruments
References in corpus (9)
- Particle Physics Models of Inflation and the Cosmological Density Perturbation
- BICEP2 / Keck Array x: Constraints on Primordial Gravitational Waves using Planck, WMAP, and New BICEP2/Keck Observations through the 2015 Season
- ARCADE 2 Measurement of the Extra-Galactic Sky Temperature at 3-90 GHz
- The ARCADE 2 Instrument
- Properties of a Variable-delay Polarization Modulator
- The Primordial Inflation Polarization Explorer (PIPER)
- An Instrument to Measure the Temperature of the Cosmic Microwave Background Radiation at Centimeter Wavelengths
- Sub-Kelvin cooling for two kilopixel bolometer arrays in the PIPER receiver
- Variable-delay Polarization Modulators for Cryogenic Millimeter-wave Applications