DOC; Mountain Administrative Support Center; Acquisition Management Division; 325 Broadway MC3; Boulder, CO

66 -- LIQUID HELIUM CRYOSTAT SOL NB814-704061 POC Doris Turner, Purchasing Agent, (303) 497-3872 E-MAIL: NOAA; MASC Acquisition Management, Joyce.J.Mills@noaa.gov. The National Institute of Standards and Technology (NIST) is seeking to purchase a liquid helium cryostat. An Adiabatic Demagnetization Refrigerator (ADR) that has been previously designed and built by NIST will be installed in the cryostat, and the entire system will be installed on a scanning electron microscope. Because of the need to have interchangability between this cryostat and existing cryostats at NIST, the design must be completely mechanically compatible with existing hardware. Detailed drawings of the cryostat can be made available upon request. Requirements are 1) The cryostat must be less than 30 inches in height and 20 inches in diameter. 2) It must weigh less than 150 pounds. 3) The vacuum space between 4K and 300K must have at least 0.75 inches of space along the length of the cryostat for electrical wiring and mechanical connections. Details of electrical and rotary feedthrough hole requirements at 4K, 77K, and 300K must be followed and can be made available. 4) The cryostat must have a cavity of approximate dimensions 6 inches diameter and 10 inches depth to install an ADR. The cryostat must be able to support the weight of the ADR, 40 pounds, at the 4K stage. 5) Two vacuum feedthroughs shall be available near the location of the 4K stage. Mechanical design must allow for radiation shields to be installed at 77K and4K at the location of the feedthroughs. Mechanical design must follow NIST design. Interested sources proposing to supply an equivalent system must submit a written qualification statement clearly establishing capability to meet the above requirements within 15 days from the date of this synopsis. In the absence of other qualified sources, it is the intent of the Government to negotiate a sole source contract under the authority of 41 U.S.C. 253(c)(1) with Infrared Laboratories, 1808 E. 17th Street, Tuscon, Az 85719 as this source is considered to be the only responsible source and no other items will satisfy agency requirements. (0017)

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