Fermilab PIP-II
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| Fermilab PIP-II | |
|---|---|
| Name | PIP-II |
| Location | Batavia, Illinois |
| Institution | Fermi National Accelerator Laboratory |
| Status | construction |
| Ground broken | 2019 |
| Beam energy | 800 MeV (superconducting linac) |
| Primary user | Long-Baseline Neutrino Facility |
Fermilab PIP-II
PIP-II is a proton improvement plan at Fermi National Accelerator Laboratory designed to upgrade the laboratory's accelerator complex to deliver high-intensity proton beams for intensity-frontier experiments. The project links developments in superconducting radio-frequency technology, accelerator physics, and cryogenics to international efforts at facilities such as CERN, KEK, DESY, and TRIUMF. PIP-II supports long-baseline neutrino research initiatives including the Deep Underground Neutrino Experiment and interfaces with programs connected to NOvA, Muon g-2, and muon-to-electron conversion studies that relate to work at J-PARC and Riken.
Background and Objectives
PIP-II arose from strategic planning at Fermi National Accelerator Laboratory and recommendations by panels such as the Particle Physics Project Prioritization Panel to enable next-generation neutrino experiments like Deep Underground Neutrino Experiment and to sustain a domestic high-intensity proton capability relevant to US Department of Energy priorities. The objective is to replace and augment parts of the existing injector chain, integrating a new superconducting linac to raise delivered beam power and pulse structure for experiments associated with Long-Baseline Neutrino Facility and muon physics programs linked to Muon Ionization Cooling Experiment-era studies. Project planning referenced accelerator R&D from institutions including Argonne National Laboratory, Lawrence Berkeley National Laboratory, and industrial partners in the United States Department of Energy accelerator complex modernization efforts.
Design and Technical Specifications
The core of PIP-II is an approximately 800 MeV superconducting linear accelerator employing continuous-wave-capable and pulsed superconducting radio-frequency cavities developed through collaborations with CEA Saclay, INFN, STFC Rutherford Appleton Laboratory, and Brookhaven National Laboratory. The linac uses cryomodules containing half-wave resonators and spoke resonators to accelerate negative hydrogen ions, enabling charge-exchange injection into the existing Booster and downstream machines such as the Recycler and the Main Injector (Fermilab). Radio-frequency systems are synchronized with low-level RF and timing systems modeled after work at DESY and CERN to minimize beam loss and space-charge effects influential in designs akin to Spallation Neutron Source upgrades. Cryogenics plant capacity, developed in consultation with vendors experienced by SLAC National Accelerator Laboratory projects, supports superconducting cavities operating at 2 K and integrates with high-power RF amplifiers and HOM damping derived from European XFEL experience.
Construction and Implementation
Construction encompasses civil works for a new linac tunnel and cryoplant infrastructure adjacent to existing facilities on the Fermilab site, procurement of cryomodules and RF equipment from vendor partners with testing performed at partner labs including Argonne National Laboratory and Lawrence Berkeley National Laboratory. Implementation phases mirror project-management frameworks used in large-scale science projects like Large Hadron Collider upgrades, with subsystem commissioning in staged increments enabling beam delivery to the Booster prior to full integration with the Main Injector (Fermilab). Workforce development and safety planning leverage institutional practices from Oak Ridge National Laboratory and coordination with the Illinois Department of Transportation for site access and logistics. International collaboration agreements established with INFN, CEA, and other agencies define in-kind contributions, technical scope, and acceptance testing protocols.
Scientific Goals and Experiments Enabled
PIP-II provides higher proton beam power and flexible timing structures to enable the Deep Underground Neutrino Experiment to pursue precision measurements of leptonic CP violation, mass hierarchy, and neutrino oscillation parameters, complementing global efforts at Super-Kamiokande and Hyper-Kamiokande. The increased intensity supports muon physics experiments targeting charged-lepton-flavor-violation searches related to proposals comparable to Mu2e and rare-process programs informed by results from MEG and COMET. Secondary-beam capabilities feed experiments in hadron structure and nuclear physics that interface with work at Jefferson Lab and TRIUMF, and provide isotope production pathways used by medical and materials science communities similar to applications at Brookhaven National Laboratory and Los Alamos National Laboratory.
Project Timeline and Milestones
Key milestones include completion of detailed design reviews, cryomodule fabrication milestones, cryoplant commissioning, and staged beam commissioning to the Booster and subsequently to the Main Injector (Fermilab). Groundbreaking and early construction began in the late 2010s with major procurement and facility work through the early 2020s, following review schedules analogous to DOE Critical Decision processes observed at projects like DUNE and LCLS-II. The timeline targets incremental beam delivery to user programs and full integration to support long-baseline operations aligned with Deep Underground Neutrino Experiment run planning and international coordination with schedules from CERN and other major laboratories.
Funding, Governance, and Collaboration
Funding is led by the United States Department of Energy Office of Science with contributions and in-kind support from international partners including INFN, CEA, and other agencies that provide cryomodules, cavity fabrication, and technical expertise. Governance follows laboratory management structures at Fermi National Accelerator Laboratory with program oversight by advisory groups such as the Particle Physics Project Prioritization Panel and review committees patterned after governance used at Large Hadron Collider upgrade projects. Collaboration agreements define roles for partner institutions like Argonne National Laboratory, Lawrence Berkeley National Laboratory, Brookhaven National Laboratory, and European partners, creating a multinational consortium for technical work packages, acceptance testing, and commissioning activities.