The development of pulse tube cryocoolers has been a significant topic of research and development over the past 20 or so years. Pulse tube cryocoolers have a number of advantages over other types of cryocoolers and are now available commercially. In order to understand pulse tube cryocoolers, it’s best to review some common aspects of … Continue reading Pulse Tube Cryocoolers
Month: September 2014
Discovery of Helium in Natural Gas: A Retrospective
A very interesting insight into the evolution of helium production and personal insights into the life and contributions of H. P. Cady was presented by his grandson, Dr. Ralph Cady Longsworth, retired from APD Cryogenics, in a paper entitled “100th anniversary of the discovery of helium in natural gas,” presented at the Cryogenic Engineering Conference in 2005. This article is excerpted from that paper with the author’s permission.
Young Faces: The Next Generation in Cryogenics, Part II
In our last issue, we debuted our third installment of Young Faces, featuring young professionals who are doing interesting things in cryogenics and superconductivity and who show promise of making a difference in their fields. Here is Part II of that story, with responses listed in order of receipt.
Superfluid Helium in Space
Many scientific observations must be done in space at cryogenic temperatures a few millidegrees to a few degrees above absolute zero (-273°C). These include observations of the behavior of superfluid helium in space and observations with instruments and millimeter-wave telescopes operating at liquid helium temperatures.
Promising New Sources of Helium
Dr. John Barclay and Raymond Hobbs report on the US's helium supply and use.
CSA board certifies newly elected directors
At the August 14 CSA Board meeting held during the Applied Superconductivity Conference in Charlotte NC, the four directors recently elected by the society’s membership were certified.