Browse Prior Art Database

Cryostat

IP.com Disclosure Number: IPCOM000094239D
Original Publication Date: 1966-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Welber, B: AUTHOR [+2]

Abstract

This efficient cryostat operates at temperatures between 4 degrees K and 77 degrees K. The cryostat comprises container 2 of insulating material such as glass, stainless steel, or the like. Base 4 is made of any good conductive material, for example, copper, and is the lowest temperature or cold finger of the cryostat. It is the cold finger whose temperature is to be regulated. Elements 6, 8, 10, and 12 are constructed as a single unit. This is lowered into the container prior to introducing the refrigerant helium 14 into the container.

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Cryostat

This efficient cryostat operates at temperatures between 4 degrees K and 77 degrees K. The cryostat comprises container 2 of insulating material such as glass, stainless steel, or the like. Base 4 is made of any good conductive material, for example, copper, and is the lowest temperature or cold finger of the cryostat. It is the cold finger whose temperature is to be regulated. Elements 6, 8, 10, and 12 are constructed as a single unit. This is lowered into the container prior to introducing the refrigerant helium 14 into the container.

Copper former 10 is wound with a few turns of wire 8, such as nichrome. Insulating material 6, preferably, though not limited to, styrofoam, the latter being bolted to former 10 by nylon rod 12. The clearance between 6, 10 and 2 is approximately 0.01 inches to allow for penetration of helium 14 to the copper base 4.

When wire 8 carries minute amounts of current to cause slight heating of helium 14 in the annular space, such helium evaporates and is replaced by gas. Since gas is a much poorer conductor of heat than liquid, cold finger 44 is insulated from bath 14. By adjusting the current to wire 8, finger 4 can be maintained at any desired temperature between 4.2 degrees K and 77 degrees
K. A temperature-sensing device has part 18 for recording the temperature of finger 4.

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