MODIFICATION
41 -- Dilution refrigerator to perform experimental tests of ultra-low NEP detectors.
- Notice Date
- 9/1/2004
- Notice Type
- Modification
- NAICS
- 333415
— Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing
- Contracting Office
- Department of Commerce, National Oceanic and Atmospheric Administration (NOAA), Mountain Administrative Support Center, 325 Broadway - MC3, Boulder, CO, 80305-3328
- ZIP Code
- 80305-3328
- Solicitation Number
- RA134104RP4036
- Response Due
- 9/8/2004
- Point of Contact
- Robert Mecklenburg, Contract Specialist, Phone (303) 497-3657, Fax (303) 497-3163,
- E-Mail Address
-
Robert.Mecklenburg@noaa.gov
- Small Business Set-Aside
- Total Small Business
- Description
- The following questions (Q) and answers (A) are provided. Nothing not stated in this amendment changes, and proposals are still due as stated. (Q)1. Are you concerned with some resistance change of NbTi wires between room T and 4 K? It will be level dependent even inside the vacuum tube. (A)1. Yes, a dependence of line resistance on He level is undesirable. (Q)2. There can be a hybrid solution of manganin twisted pairs/NbTi pairs, with an intermediate terminal at either IVC flange (inside vacuum space) or 1 K pot. (A)2. The proposed hybrid solution is attractive with a warmer manganin and a colder NbTi section. Regarding D subminiature and MDM connectors: (Q)3. Vendor preference; (A)3. We have no vendor preference on D subminiature connectors. We emphasize that we are open to any solution for the room temperature connectors that is both hermetic (i.e. vacuum tight) and readily compatible with RF filtering. (Q)4. Any special options, like materials involved? (A)4. We have no vendor preference on MDM connectors for the cold end of the DC wiring. Metal connector shells are highly desirable. A dielectric compatible with mK temperatures is desirable. Epoxy strain-relief of the wires at the back end of the connector is desirable. (Q)5. Three additional ports – should they have tubes running through the helium space? (A)5. Yes. (Q)6. In Option 0006 - do you mean to occupy one of this additional ports? (A)7. Yes. (Q)8. In Option 0008 do you mean “to allow wiring for Option 0007”? (A)8. Yes, there is a typo. It should read to allow wiring for Option 7. (Q)9. If yes, what do you choose for micro-coax? Can we suggest SS in SS braid, 50 Ohm impedance micro-coax? (A)9. Yes, SS is reasonable for the micro-coax. (Q)10. Will you accept manganin in CuNi shield twisted pair for thermometry (our normal way)? (A)10. Manganin is acceptable for the thermometry wiring. For the DC experimental wiring of option 7, NbTi is preferred because of the lower resistance below 4 K. (Q)11. Please confirm you need "Light-tightness" inside the 60 mK rad-shield only, or you want it to start from IVC, then Still rad-shield, and 60 mK rad-shield. (A)11. We need light-tightness at each shield stage: IVC, still, and especially 60 mK. (Q)12. Please confirm that 60 DC wires (30 pairs) are needed. (A)12. We would like 60 pairs (120 wires). NOTE: THIS NOTICE WAS NOT POSTED TO WWW.FEDBIZOPPS.GOV ON THE DATE INDICATED IN THE NOTICE ITSELF (01-SEP-2004); HOWEVER, IT DID APPEAR IN THE FEDBIZOPPS FTP FEED ON THIS DATE. PLEASE CONTACT fbo.support@gsa.gov REGARDING THIS ISSUE.
- Web Link
-
Link to FedBizOpps document.
(http://www.eps.gov/spg/DOC/NOAA/MASC/RA134104RP4036/listing.html)
- Place of Performance
- Address: DEPT. OF COMMERCE BOULDER LABS 325 BROADWAY BOULDER. CO 80305
- Zip Code: 80305
- Country: USA
- Record
- SN00663877-F 20040903/040901214218 (fbodaily.com)
- Source
-
FedBizOpps.gov Link to This Notice
(may not be valid after Archive Date)
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