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In Memoriam: David Pegg

Former president of the Society for Cryobiology, Dr. David Pegg has died at 86. Pegg helped set up the international Society for Cryobiology in 1964, and start its journal, Cryobiology, of which he later became editor in chief, eventually becoming the society’s president from 1974-75. A pioneer in the field...

ISRO To Test Semi-Cryogenic Engine In Ukraine

ISRO, the Indian space agency, moving on from their not-so-successful moon landing attempt, has started to look ahead to upcoming missions. The next feat is a group of liftoffs, starting with PSLV 47 later this month. The first step is inspection and trial of the semi-cryogenic engine in Ukraine.

KEK Publishes the International Working Group’s Recommendations for International Linear Collider

KEK has received the International Working Group’s report of recommendations regarding the International Linear Collider (ILC) project and published a document, “Recommendations on ILC Project Implementation," outlining the suggestions. The report calls for cost-sharing programs for the civil engineering projects, accelerator components, conventional facilities construction and operating costs. It goes...

World’s First Hydrogen Powered Boat Docks in London

The world's first hydrogen powered boat has docked in London, the last stop of its European tour. The 30-meter Energy Observer acts as a “floating lab” for testing green maritime technology. It harnesses electricity from three renewable energies¬¬¬–hydrogen, solar and wind–to propel the boat and charge its batteries. Using this...

“Orange” You Excited for SLAC’s New X-Ray Laser?

See upgrades to SLAC National Accelerator Laboratory’s X-ray laser, including some of the 37 cryomodules to be completed, in a collection of photos showcasing its trademark orange styling, and learn more about the experiments it will enable.

SOFIA Soars to Observe the Universe

SOFIA, the Stratospheric Observatory for Infrared Astronomy, is a unique plane-based observatory housed inside a 747 aircraft. A joint project between NASA, Universities Space Research Association, and the German Aerospace Center-DLR since 1997, it takes advantage of the stratosphere to eliminate the absorbing effect atmospheric water has on infrared observations....

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Cold Compressors

A common way to provide cooling below the normal boiling point of helium (4.2K) is to reduce the pressure above the bath of liquid helium, thus also reducing the bath’s equilibrium saturation temperature. For example, to produce a 1.8K bath of liquid helium, the saturation pressure has to be reduced...

Kapitza Conductance

Kapitza conductance refers to the heat transfer between a solid surface and a fluid that covers that surface. Fundamentally, it describes the inherent difficulty in transferring energy from a solid to the fluid covering the solid surface. This phenomenon was first observed by P. L. Kapitza in 1941 while studying...

Thermosyphons

A thermosyphon (or thermosiphon) is a device that transfers heat via natural convection in a fluid. The natural convection is driven by gravity with the colder, denser fluid flowing downhill and the warmer, less dense fluid flowing back up. Thus, thermosyphons connect an object to be cooled with a reservoir...

Magnetic Levitation

From http://www.superconductors.org. Magnetic-levitation is an application where superconductors perform extremely well. Transport vehicles such as trains can be made to “float” on strong superconducting magnets, virtually eliminating friction between the train and its tracks. Not only would conventional electromagnets waste much of the electrical energy as heat, they would have...

Superconductivity

From Superpower website. History of Superconductivity Superconductivity was discovered in 1911 by the Dutch physicist, Heike Kammerlingh Onnes when he was able to liquefy helium by cooling it to 4 Kelvin, or -452°F. This enabled him to cool other materials close to absolute zero and investigate their electrical properties. He...

Medical Applications of Cryogenics

Neutron Therapy Cryogenics is at the heart of nuclear accelerators. Accelerators such as Fermilab’s Tevatron make neutron therapy for cancer possible. From Fermilab Today 4/20/09: Fermilab currently offers neutron therapy. But staff at Fermilab designed and built the proton accelerator used by the nation’s first hospital-based treatment center to use...

Nuclear Physics

Al Zeller National Superconducting Cyclotron Lab (NSCL) at Michigan State University zeller@nscl.msu.edu Cryogenics has a long history in nuclear physics. The technology has its origins in the use of cold traps for maintaining a vacuum, which is required to prevent beam loss and for generating high voltages used in acceleration....

An Issue of Pressure and Flow Rate in a Supply Tank

Please help solve this problem: A supply tank requires a vaporizer to generate sufficient pressure to pump stored fluid up into a vehicle or tank. The available head is limited as the tank level falls and it is important to minimize the system pressure drop to maintain the desired flow...

Using MLI on VJ Line Joints or Cryo Storage Tanks

When installing Multi Layer Insulation (MLI) blankets on VJ line joints or cryo storage tanks should they be wrapped and tied down tight or loose? These are usually pre-cut to size. Also should they have an access hole at the point of where the molecular sieve is installed to help...