Abstract
Summary The cryosorption pumping of helium and hydrogen has been studied at 4.2°K and at pressures between 10 -7 to 10 -10 Torr. The experiments were conducted with unshielded cryosorption panels, as well as with panels shielded against thermal radiation and contamination by condensable gases. The panels consisted of refrigerated metal plates to which thin layers of Molecular Sieve 5A adsorbent were bonded by a special technique. The panels were found to exhibit a high adsorptive capacity, as well as near theoretical pumping speeds for helium and hydrogen under the experimental conditions. The pumping speed of the shielded panels was controlled by the conductance of the shields, which consisted of parallel arrays of chevron baffles. The usefulness of cryosorption pumping arrays in space environment simulation and various industrial applications is discussed.
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