MODIFICATION
66 -- Liquid Helium Cryostats
- Notice Date
- 2/25/2005
- Notice Type
- Modification
- NAICS
- 334516
— Analytical Laboratory Instrument Manufacturing
- Contracting Office
- Department of Commerce, National Institute of Standards and Technology (NIST), Acquisition and Logistics Division, 100 Bureau Drive, Building 301, Room B129, Mail Stop 3571, Gaithersburg, MD, 20899-3571
- ZIP Code
- 20899-3571
- Solicitation Number
- SB1341-05-Q-0356
- Response Due
- 3/10/2005
- Archive Date
- 3/25/2005
- Description
- *****Solicitation SB1341-05-Q-0356 is hereby amended in order to modify the language and add preferences to the following technical specifications and evaluation criteria (changes are noted in capital letters. The following specifications are hereby changed: ***Specification 1: FROM: **Cryostat shall have a liquid helium hold time not less than 2 weeks on a single fill when the optical ports are blanked-off and there is no wiring. The liquid helium capacity shall be at least 4 liters. The liquid helium cryostat shall be capable of evacuation down to 24 Torr while containing liquid helium. There is no hold time requirement liquid helium is below atmospheric pressure; TO: **Cryostat shall have a liquid helium hold time not less than 2 weeks on a single fill when the optical ports are blanked-off and there is no wiring. The liquid helium capacity shall be at least 4 liters. The liquid helium cryostat shall be capable of evacuation down to 24 Torr while containing liquid helium. There is no hold time requirement WHEN THE liquid helium is below atmospheric pressure. PREFERENCE SHALL BE GIVEN TO SYSTEMS WITH LONGER HOLD TIMES. ***Specification 6: FROM: **All enclosed volumes shall be vented to allow efficient pump down of the vacuum space. All blind tapped holes in vacuum shall be vented. The working volume and the volume between the liquid N2 and liquid He shall be vented when all optical access ports are blanked off such that light can not pass directly through the vents, with the goal of keeping the working volume background radiation level close to 4 K when all optical access ports are blanked off; TO: **All enclosed volumes IN THE VACUUM SPACE shall be vented to allow efficient pump down of the vacuum space. All blind tapped holes in vacuum shall be vented. The working volume and the volume between the liquid N2 and liquid He shall be vented when all optical access ports are blanked off such that light can not pass directly through the vents, with the goal of keeping the working volume background radiation level close to 4 K when all optical access ports are blanked off; Specification 7: FROM: **The vacuum vessel shall have 4 equally spaced optical access side ports able to hold 2 inch (50.8 mm) diameter vacuum windows. The optical axis shall be less than 4 inches (102 mm) from the cryostat bottom (excluding a removable stand). Optical access side ports that are made through any intermediate radiation shielding shall have mounts such that filters and aperture discs can be firmly mounted in them and they shall be made incrementally smaller, such that filters and aperture discs can be removed to the outside without disassembling the cryostat body. The optical access ports on the liquid He radiation shield surrounding the working volume shall have an optical clearance of no less than 0.5 ? diameter; TO: **The vacuum vessel shall have 4 equally spaced optical access side ports able to hold 2 inch (50.8 mm) diameter vacuum windows. The optical axis shall be less than 4 inches (102 mm) from the cryostat bottom (excluding a removable stand). Optical access side ports that are made through any intermediate radiation shielding shall have mounts such that filters and aperture discs can be firmly mounted in them and they shall be made incrementally smaller, such that filters and aperture discs can be removed to the outside without disassembling the cryostat body. The optical access ports on the liquid He radiation shield surrounding the working volume shall have an optical clearance of no less than 0.5 inches in diameter. PREFERENCE SHALL BE GIVEN TO SYSTEMS WITH OPTICAL ACCESS CENTERED THROUGH THE WORKING VOLUME; ***Specification 10: FROM: **Delivery of the complete cryostat shall be required in not more than 12 weeks from receipt of order; TO: **Delivery of the complete cryostat shall be required in not more than 12 weeks from receipt of order. PFREERENCE SHALL BE GIVEN TO SYSTEMS WITH DELIVERY TIMES SHORTER THAN 12 WEEKS. ***Technical Evaluation Criteria: FROM: ****Evaluation of Technical Capability shall be based on the information provided in the quotation. Quotations shall include the documentation or other product literature, which CLEARLY DOCUMENTS that the offered product meets or exceeds the specifications stated above. In determining best value, the Government will give strongest consideration to: optical access and cryogen hold time. TO: ****Evaluation of Technical Capability shall be based on the information provided in the quotation. Quotations shall include the documentation, TECHNICAL DRAWINGS, or other product literature, which CLEARLY DOCUMENTS that the offered product meets or exceeds the specifications stated above. In determining best value, the Government will give strongest consideration to: optical access, cryogen hold time, AND EXCEEDING DELIVERY TIME REQUIRMENT. *****The due date for quotes shall remain March 10, 2005, at 3:00 pm EST. All questions should be addressed in writing (via email) to the Contract Specialist at ERIN.SCHWAM@NIST.Gov. FAXED AND EMAILED QUOTATIONS SHALL NOT BE ACCEPTED. ***** ALL OTHER TERMS AND CONDITIONS SHALL REMAIN UNCHANGED AND IN FULL FORCE AND EFFECT.*****
- Place of Performance
- Address: 100 Bureau Drive, Building 301 Shipping and Receiving, Gaithersburg, MD
- Zip Code: 20899
- Country: USA
- Zip Code: 20899
- Record
- SN00758561-W 20050227/050225211921 (fbodaily.com)
- Source
-
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