Fermilab LBNF NSCF Construction - Beamline Complex

The Long-Baseline Neutrino Facility / Deep Underground Neutrino Experiment - U.S. (LBNF/DUNE-US) Project will provide facilities to enable a world-class program in neutrino physics that can measure fundamental physical parameters, explore physics beyond the Standard Model, and better elucidate the nature of matter and anti-matter.

Specifically, the LBNF/DUNE-US Project will build a new high-intensity neutrino beam at Fermilab aimed at the LBNF Far Site, located at South Dakota’s Sanford Underground Research Facility (SURF), 1,300 km away; the associated DUNE subproject will build neutrino detectors at Fermilab and SURF. The experiment will be optimized for precision measurement of neutrino oscillations with the goal of searching for charge parity-violation in the neutrino sector, as well as making other precision oscillation measurements.

The Near Site Conventional Facilities (NSCF) provides the new service buildings, underground enclosures, utilities, roads, hardstands, and other conventional facilities features needed for operation of the LBNF Beamline and DUNE Near Detector. This requirement is for the NSCF Beamline Complex comprising the following elements.

1. Site Work Site Work includes new utilities and roads, mass earthwork, and other site improvements necessary to accommodate the LBNF Beamline Complex enclosures and buildings.

2. Pre-Target The Pre-Target includes the facilities necessary to extract a beam of protons (the primary beam) from Fermilab’s Main Injector accelerator and direct it toward the LBNF target on a trajectory toward the Far Detectors. These facilities include:

A. Extraction Enclosure The Extraction Enclosure is an underground cast-in-place concrete enclosure that intersects and supports the existing Main Injector enclosure and allows the extraction of the LBNF primary beam from the Main Injector. B. Primary Beam Enclosure The Primary Beam Enclosure is an underground cast-in-place concrete enclosure that connects the Extraction Enclosure to the Target Hall Complex and houses the primary beam magnet string.

The majority of the Primary Beam Enclosure is founded on deep foundations. C. Primary Beam Service Building (LBNF-5) The Primary Beam Service Building is a single-story, at-grade, shallow-founded insulated metal panel building housing power supplies, heat rejection, and other facilities to support the primary beam.

3. Target Complex The Target Complex is a large, complex, massively-shielded at-grade cast-in-place concrete and insulated metal panel building founded on deep foundations that houses the LBNF target pile where the primary beam interacts with the target to produce the beam of particles that decay into the neutrino beam.

4. Decay Region The Decay Region includes a 194-meter long, 4-meter diameter, double-walled steel vessel set at a downward slope on a trajectory towards the Far Detector. The beam of particles leaving the Target Complex pass through the Decay Region where a portion decay into neutrinos. The Decay Region vessel is shielded with a minimum thickness of 5.6 meters of concrete and is enclosed in a below-grade concrete structure. The inner steel vessel contains helium and the outer vessel annulus is cooled with gaseous nitrogen supplied from the Target Complex.

5. Absorber Complex The Absorber Complex is a multi-level structure that includes a service building (LBNF-30) at the surface and a concrete shaft structure housing underground levels for equipment and the Absorber. The Absorber prevents particles other than neutrinos from continuing downstream. To be put on the list of Offerors to receive an RFP, please email Brian Quinn, bquinn@fnal.gov. This solicitation is expected to be released in May/June 2024. NO ADDITIONAL INFORMATION WILL BE AVAILABLE UNTIL THE SOLICITATION IS RELEASED.