Cryostat RFI Specifications.pdf
PDF 75 KB Posted
- Attached to
- Ultra-low-temperature Optical Cryostat Federal contract opportunity
- Solicitation number
- N00173-25-RFI-GF37
About this file
This requirements document details specifications for an ultra-low-temperature optical cryostat designed for scientific research and optical measurements. The instrument must cool samples below 1.2 Kelvin for a minimum of 8 hours with less than 10 millikelvin temperature fluctuation, accommodate 30 mm diameter samples, and provide at least 200 microwatts of cooling power. Key technical requirements include bidirectional optical access with a 19-degree acceptance angle, 12 DC electrical lines, 2 RF microwave lines, all thermally lagged to the 1.2 Kelvin sample platform, and a compact design that positions the sample within 6 inches of a standard optical table.
Additional specifications mandate a closed-cycle refrigeration system that does not require liquid cryogen refilling, total cooldown time under 20 hours, and computer control compatibility with LabView or Python. The vendor must provide exchangeable windows with anti-reflection coatings for visible, infrared, and potential future UV measurements, along with complete installation and repair services. All associated compressors must be air-cooled, and the instrument must be rigidly mountable to an optical table with minimal distance between the outermost window and sample (maximum 3 inches).
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Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| RFI_Sources Sought Instructions - Cryostat.pdf |
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Text version
Requirements document for ultra-low-temperature ( T < 1.2 K) optical cryostat
The instrument must provide optical access to samples for optical microscopy and other optical measurements at temperatures below 1.2 Kelvin as well as both DC and RF electrical/microwave feedthroughs to the low temperature sample platform.
1. System must cool samples below 1.2 Kelvin for a minimum of 8 hours continuously with
< 10 millikelvin peak-to-peak temperature stability.
2. Sample space must accommodate at least 30 mm diameter samples.
3. System must provide at least 200 microwatts of cooling power at 1.2 Kelvin
4. If a periodic reset is necessary, system must recharge and be ready for the new 8 hour cooling cycle with less than 3 hours of additional recovery time
5. Total cooldown time from room temperature to base temperature < 20 hours
6. Bidirectional (front/back) optical access to the sample is needed for reflection and/or transmission optical measurements, with an optical acceptance angle of at least 19 degrees in both directions simultaneously.
7. At least 12 DC electrical lines must be provided and fully thermally lagged to 1.2 Kelvin sample platform.
8. At least 2 coaxial RF microwave lines must be provided and fully thermally lagged to 1.2
Kelvin sample platform
9. When fully assembled and running, instrument must position sample no greater than 6 inches above surface of a standard optical table.
10. The instrument must be mountable rigidly to a standard optical table. It may not hang down from a separate structure.
11. The distance from the outermost window to the sample must not exceed 3 inches.
12. Exchangeable window options must be available from vendor with anti-reflection coatings suitable for Visible and/or Infrared measurements. UV coatings must be available for future upgrades.
13. Computer control and monitoring of instrument must be provided with API compatible with LabView or Python based instrument control schemes.
14. Vendor must be able to provide all instrument installation and repair services
15. All compressors or other equipment associated with instrument must be air-cooled.
16. Instrument must use closed-cycle refrigeration. It must not require the user to refill liquid cryogens regularly during use.
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