National Institute of Standards & Technology, Acquisition & Assistance Div.,100 Bureau Drive Stop 3572, Bldg. 301, Rm B117, Gaithersburg, MD 20899-3572

66 -- FANS NEUTRON SPECTROMETER PARTS!! SOL 52SBNB0C1048 DUE 033100 POC Carolyn Wilder (301) 975-8332 WEB: NIST Contracts Homepage, http://www.nist.gov/admin/od/contract/contract.htm. E-MAIL: NIST Contracts Office, Contract@nist.gov. The U.S. Department of Commerce, National Institute of Standards and Technology (NIST), Center for Neutron Research (NCNR) has a requirement for the fabrication of some of the component parts for the second phase construction of the Filter Analyzer Neutron Spectrometer (FANS II) to be procure under an indefinite delivery indefinite quantity contract. Example of a Task Order is NIST's requirement for the fabrication of a vacuum chamber and some of its components. The chamber is a stepped pie shaped structure with a 127-degree arc with an outer radius of 114.31 centimeters and an inner radius of 36.02 centimeters. At these points the height of the chamber is, respectively, 41.91 centimeters and 30.16 centimeters. The entire structure is made of welded aluminum (6061-T6) 2.54 centimeters thick, except for two windows at the extreme radii whose thickness are 0.635 centimeters (outer diameter) and 0.318 centimeters (inner diameter) respectively. The vacuum structure has three openings at the top to allow cryogenic filters to be lowered in the chamber. These filters are made of 52 graphite and 124 beryllium radial cubes, which are cooled, to liquid nitrogen temperature. Each of these filters are separated on all side by thin (0.09 cm) boron 10-aluminum alloy spacers. The vessel shall operate in a vacuum, at room temperature, at an absolute pressure of 2 mtorr. Behind the vacuum chamber is a structure containing 59 helium-3 neutron detectors operating at high voltage. The whole FANS II system is capable of moving on specially designed air pads under computer control. Period of Performance is from the Date of Contract Award through twelve (12) months thereafter with two one-year options to renew. It is the Government's intent to negotiate with the Bechdon Company, Inc, 330 Commerce Drive, Upper Marlboro, MD 20774-8746, the only responsible source that can satisfy the agency's requirements. Most of the component part for phase II of this instrument are identical or represent small modifications to the phase I instrument (FAN I) already built by Bechdon Company Inc. This company has all the computer program developed to fabricate many of these components and is familiar with some of the complicated technical problems involve in the vacuum cryogenics involved in the filter analyzer-neutron detector system for this advanced neutron spectrometer. The Government anticipates the award of an indefinite delivery indefinite quantity, fixed price contract with a maximum order limitation of $350,000 for the life of the contract. -- A Request for Solicitation (RFP) package is not available -- See Number Note 22 and 26. ***** Posted 03/17/00 (W-SN435723). (0077)

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