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

66 -- SUPERMIRROR POLARIZERS SOL 53SBNB9C1050 DUE 052499 POC Pauline E. Mallgrave, Tel (301) 975-6330, or Anne McFarlane, Contract Specialist, Tel (301) 975-4648, FAX (301) 963-7732, e-mail anne.mcfarlane@nist.gov WEB: NIST Contracts Homepage, http://www.nist.gov/admin/od/contract/contract.htm. E-MAIL: NIST Contracts Office, Contract@nist.gov. The National Institute of Standards and Technology (NIST) has a requirement for the fabrication of 132 supermirror polarizing elements for the Neutron Spin-Echo Spectrometer. The supermirror polarizing elements shall have the following characteristics: 1) The substrates of the elements shall be made of boron glass 205 mm wide, 300 mm long, and 0.5 mm thick. The boron glass shall have an absorption length of at least 7.6 cm-1 for 3.5 A neutrons (> 15 wt% natural B2O3). The flatness and smoothness of the substrates shall be such that conditions 2 and 3 below be met. 2) The substrates shall be permanently coated on both sides with polarizing supermirror coatings with m = 2.5 (reflectivity R > 0.8 for neutrons reflecting with q < 2.5 qc,Ni) and an absorbing anti-reflecting coating between supermirror and substrate to maintain the required high polarization P in reflection (P > 0.9) for q > 0.5 qc,Ni (qc,Ni = 0.022 A-1). 3) The polarization of the supermirrors shall be maintained by a maximumfield of 5 milliTesla applied along the 300 mm dimension. Application of a 40 milliTesla field for up to 1 minute to initially polarize the elements shall be acceptable. 4) An additional 150 uncoated identical substrates shall also be provided. Complete specifications for bidding and construction will be provided in the solicitation. This solicitation is being conducted as a Commercial Acquisition. The Government anticipates award of a firm fixed price contract. Delivery location is NIST, Gaithersburg, MD 20899. The FOB Point shall be Destination. Desired delivery is 120 days after receipt of order, and required delivery is 150 days. You may fax your request for the solicitation to (301) 963-7732. The SIC code which applies is 3827. All responsible sources may submit a proposal which shall be considered by the agency. Posted 05/11/99 (W-SN329900). (0131)

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