# SAM #RFP384239

Fabrication and delivery of two 1.3 GHz ERDC superconducting RF cavities

**Buyer:** Fermilab
**Posted:** October 20, 2026
**Respond By:** November 12, 2026
**Identifier:** RFP384239
**NAICS:** 332710, 332313

Fermi National Accelerator Laboratory (FNAL), a U.S. Department of Energy facility, is seeking proposals for fabrication and delivery of two custom ERDC superconducting radiofrequency cavities.
- **Buyer:** FNAL; the drawings identify its Technical Division – Design and Drafting. The procurement is described as ERDC work supported by FNAL.
- **Requested items:** Two 9-cell, 1.3 GHz conduction-cooled SRF cavities, plus an FNAL-supplied SENSR GP1 accelerometer for each crated shipment. The parts-and-pricing sheet lists two units of “ERDC Cavity Fabrication.”
- **OEM/vendor names:** **SENSR** is named in connection with the GP1 accelerometer. No cavity fabricator, reseller, or other supplier is identified by name.
- **Fabrication scope:** Use FNAL-provided niobium and Nb55Ti materials, drawings, and 3D model. The vendor provides planning, drawings, tooling and fixtures, welding, inspections and testing, documentation, packaging, and shipment.
- **Notable requirements:** FNAL approval of the QA plan and fabrication documents before work; dimensional and optical inspection and helium leak checks; protected clean handling; serial numbers; and documented experience fabricating conduction-cooled cavities. Optional pricing is requested for CMM measurements of both cavities and eddy-current scanning of raw niobium.
- **Drawing-defined components:** The assembly and subassembly parts list specifies cavity weldments, half cells, flanges, tubes, HOM components, cooling rings/fins, and stiffening rings, with Fermilab part numbers and quantities detailed below. Requirements include vacuum-tight electron-beam weldments, ultra-high-vacuum cleanliness and handling, weld and concentricity tolerances, and tuning allowances.
- **Schedule:** No fixed period or contract duration is stated; the vendor proposes a fabrication, inspection, and delivery schedule.

### Description

<p>Cavity</p>

[View original listing](https://sam.gov/opp/8bb6bc9ec345472185d4447676657c29/view)