# TESSERACT Dilution Refrigerator

Canonical: https://abierto.us/opportunities/bz202513

- Solicitation number: BZ-2025-13
- Notice type: Sources sought
- Status: Closed. Deadline was September 11, 2025 at 6:00 PM EDT
- Department: Department of Energy
- Contracting office: Berkeley Natl Lab - DOE Contractor (899032)
- NAICS: 334516 Analytical Laboratory Instrument Manufacturing
- Product or service code: 9999 Miscellaneous Items
- Place of performance: Berkeley, California
- County: Alameda County (FIPS 06001). https://abierto.us/counties/alameda-county-ca-06001
- City: Berkeley. https://abierto.us/cities/berkeley-ca-0606000
- First posted: August 27, 2025
- Last posted: August 27, 2025
- SAM.gov: https://sam.gov/workspace/contract/opp/8b324aff5b334ca997ea28e4cef30001/view

## Description

Lawrence Berkeley National Laboratory (LBNL) is conducting market research to identify sources that possess the capabilities and experience necessary to provide a dilution refrigeration system for a low-temperature application. The TESSERACT project involves the development of a highly sensitive low-temperature detector system aimed at probing extremely rare physical events.

To achieve the necessary performance, the system must operate at temperatures on the order of 10 mK while also minimizing radioactive backgrounds. This dual requirement presents a unique set of technical challenges for the dilution refrigerator design. Specifically, the detector target and sensors must be enclosed within layered shielding enclosures to suppress environmental radiation. To integrate with these enclosures, the refrigerator must be equipped with shielding cans that feature a narrow-necked geometry.

This allows the lower section housing the detector to extend into a pre-installed room-temperature shielding assembly. Additionally, internal shielding materials must be incorporated into the refrigerator itself, resulting in substantial static loads on the cold plate and mixing chamber. Please see the attached RFI document for more detail and response instructions.

## Publications

- August 27, 2025: Sources sought, due September 11, 2025 at 6:00 PM EDT. Notice 8b324aff5b334ca997ea28e4cef30001. https://sam.gov/workspace/contract/opp/8b324aff5b334ca997ea28e4cef30001/view

## Points of contact

- Brian Zatkow, bzatkow@lbl.gov, 510-495-2547

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Source: SAM.gov Contract Opportunities bulk extract. Confirm deadlines on SAM.gov before responding. Cite https://abierto.us/opportunities/bz202513.