The accelerators for the Facility of Rare Isotope Beams (FRIB) facility are among the most powerful and technically demanding hadron accelerators in the world. Intense beams of heavy ions up to uranium are produced and accelerated to 200 MeV/u and higher energy with beam powers up to 400 kW to produce rare isotopes. Scientific experiments can be performed with rare isotope beams at velocities similar to the driver linac beam, at near zero velocities after stopping in a gas cell, or at intermediate velocities through reacceleration. The design and development of the FRIB driver accelerator requires the most advanced knowledge in accelerator physics and engineering involving beam dynamics with electron-cyclotron-resonance (ECR) ion sources, radio-frequency quadrupole (RFQ) linac, superconducting RF linac; space charge and beam halo; charge stripping mechanisms based on solid film, liquid film, and gases; mechanisms of beam loss, collimation, and collection; mechanisms of vibration, microphonics, and compensation; and mechanisms of gas dissorption, electron cloud, and mitigations.
Accelerator engineering covers fields of superconducting material and technology; low-temperature cryogenics; permanent and electromagnetic magnets and power supplies; radio-frequency vacuum; beam diagnostics instrumentation and electronics; accelerator controls and machine protection; and beam collimation and shielding. Design, R&D, construction, commissioning, and upgrade of the FRIB accelerator complex involve fascinating and challenging works across multiple disciplines at Michigan State University and in collaboration with major accelerator institutes and laboratories in United States and throughout the world.
During the past 25 years, I have had the opportunity to work on several accelerator projects including the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, the U.S. part of the Large Hadron Collider at CERN, the Spallation Neutron Source at Oak Ridge National Laboratory in collaboration with Lawrence Berkeley, Los Alamos, Thomas Jefferson, Brookhaven, and Argonne National Laboratories, the China Spallation Neutron Source project, and the Compact Pulsed Hadron Source in China. My scientific research involves accelerator physics of high-energy colliders and high-intensity proton accelerators; beam dynamics of non-adiabatic regime and transition crossing in high-intensity rings and proton drivers; magnetic fringe field and nonlinearity correction; electron cloud formation and mitigation in high-intensity rings; intra-beam scattering of heavy-ion beams in colliders; beam cooling and crystallization; development of spallation neutron sources; development of compact pulsed hadron sources; development of hadron therapy facilities; development of accelerator driven sub-critical reactor programs for thorium energy utilization and nuclear waste transmutation; and development of accelerators for rare isotope beams. The field of accelerator physics is uniquely rewarding in that ideas and dreams can be turned into reality through engineering projects, through which one experiences endless learning in physics, technology, teamwork and fostering friendships.
Presently, our team is responsible for the design, prototyping, construction, and commissioning of the driver accelerator complex of the FRIB Project and the commissioning of the ReA3 reaccelerator. Our division contains departments and groups of Accelerator Physics, Superconducting Radio-frequency, Cryogenics, Diagnostics, Controls, Magnet, Front End, Collimation and Beam Dumps, Vacuum and Alignment, ReA3, Mechanical Engineering, and Electrical Engineering. We collaborate closely with major DOE national laboratories in the United States and worldwide with accelerator institutes in Europe and Asia. We are looking forward to more students and young fellows joining us to start their scientific career in the field of accelerator physics and engineering, and joining us in the exciting works of turning FRIB accelerator design into reality.
FRIB accelerator status and challenges, J. Wei, et al, Proc. Linac Conference, Tel Aviv (2012), pp. 417
Synchrotrons and accumulators for high-intensity proton beams, J. Wei, Reviews of Modern Physics, 75, 1383 (2003)
The low-energy state of circulating stored ion beam: crystalline beams, J. Wei, X-P. Li, A. M. Sessler, Physical Review Letters, 73, 3089 (1994)
Necessary Conditions for Attaining a Crystalline Beam, J. Wei, H. Okamoto, A.M. Sessler, Physical Review Letters, 80, 2606 (1998)
Theorem on magnet fringe field, J. Wei, R. Talman, Particle Accelerators, 55, 339 (1996)
Low-loss design for the high-intensity accumulator ring of the Spallation Neutron Source, J. Wei, et al, Physical Review ST-Accel. Beams, Vol. 3, 080101 (2000)