Radiabeam Technologies, LLC

Radiabeam Technologies, LLC, a Santa Monica–based manufacturer of advanced particle accelerator components and radiation technologies, operates as a small business prime contractor on federal SBIR/STTR and research funding programs, with 97% of its recent awards held as prime contracts and grants rather than subcontracts. The company competes under total small business set-asides across its prime portfolio and holds no SBA designations beyond small-business status.

Radiabeam's capability footprint centers on the design, manufacturing, and validation of particle accelerator systems, superconducting radiofrequency (SRF) cavities, tunable gamma-ray and X-ray sources, and radiation testing platforms for defense, scientific research, and nuclear fuel transmutation applications. Representative prime contract work includes a $10.554 million DARPA cost-plus-fixed-fee definitive contract awarded March 8, 2024, for the Advanced Sources for Single-Event Effects Radiation Testing (ASSERT) program to develop single-event effect testing capabilities for 3D heterogeneously integrated electronics (completion August 18, 2027); a $1.799 million Air Force Research Laboratory total small business set-aside definitive contract awarded March 4, 2026, for Phase II SBIR research on wasp-related accelerator work (completion March 4, 2028); and a $3 million DARPA SBIR Phase II contract awarded May 17, 2024, for development of a tunable, directional, and intense inverse Compton scattering gamma-ray source. On the grant side, Radiabeam received two 2026 cooperative agreements from the Advanced Research Projects Agency-Energy (ARPA-E) under the Nuclear Energy Waste Transmutation Optimized Now (NEWTON) program: $1.4 million (awarded April 7, 2026, completion April 6, 2029) for superconducting Nb3Sn cavities for 10 megawatt proton linacs, and $1.079 million (awarded February 19, 2026, completion February 18, 2029) for thin-film niobium-tin superconducting cavities for accelerator-driven waste transmutation systems. Radiabeam is also an active recipient of Department of Energy Office of Science project grants spanning SRF cavity development, accelerator beam diagnostics, synchrotron beamline assembly, and rare isotope beam shaping; recent awards include work on ion linac accelerators based on niobium-tin and force-neutral adjustable phase undulators.

Customer concentration leans heavily toward federal research and defense agencies. The Department of Energy (combining Office of Science and departmental awards) accounts for 85 awards across the portfolio; Defense Advanced Research Projects Agency anchors the dollars with 11 awards valued at $32.1 million in combined potential value; and the Air Force Research Laboratory holds 11 awards totaling $6 million. The top five funding customers by award count represent 73% of awards. However, the dollar concentration differs: DARPA's 11 awards represent 53% of the combined potential value across the top-five-dollar-ranked agencies, while DoE's 85 awards carry modest individual ceilings typical of basic research grants. This split signals a customer base split between large-dollar SBIR Phase II and full development contracts with DoD agencies and distributed smaller project grants from the Department of Energy Office of Science.

Radiabeam places minimal work through parent vehicles; the source identifies only one indexed IDC (Indefinite Delivery Contract FA945122D0003) with one task order recorded. The vendor's awards are predominantly standalone definitive contracts and direct grant awards rather than task-order vehicles, reflecting the SBIR/STTR program structure and Department of Energy grant portfolio that dominate its footprint.

In its subcontractor role, Radiabeam performs specialized subsystem development and engineering support. It subcontracts to Triad National Security, LLC on an igf (Independent Governance Foundation) competition item-level professional services agreement (May 7, 2026) related to Los Alamos National Laboratory management and operations. It supports Leidos on a June 6, 2025 award for high-frequency, high-power HPEM source fabrication under a contract statement of work. Radiabeam also acts as a sub-recipient on two National Institutes of Health or research-institution grants administered through the University of California, San Francisco, performing linac design, modulator upgrades, and electron beam testing for FLASH radiotherapy system development (awards February 1, 2024, and March 17, 2025).

Activity peaked in 2022 with 14 awards and has moderated to four in 2026 through May; nine awards carried completion dates inside the next twenty-four months with combined potential value of $14.2 million, representing recompete exposure in that window. The vendor carries a subsidiary, Radiabeam Systems, LLC, structured as a limited liability company; the source does not specify distinct capabilities or operational roles for the subsidiary. Awards span research and development in physical, engineering, and life sciences (51 awards across the top two NAICS subcategories) and defense-related basic and applied research PSC codes, with 152 total awards recorded and combined obligated dollars of $137.7 million against combined potential value of $60.9 million—a pattern indicating significant contract modifications and task order expansion beyond original ceiling values.

We design and build particle accelerator components, such as diagnostic systems, magnetic optics, and accelerating structures (RF guns/photoinjectors).