ISAC-II

ISAC-II
Name	ISAC-II
Facility	TRIUMF
Location	Vancouver Island, British Columbia, Canada
Type	Radioactive Ion Beam Facility
Operator	TRIUMF
Status	Operational
Beam	Heavy-ion radioactive beams
Energy	Up to ~6.5 MeV/u for heavy ions (post-accelerated)
First beam	2000s

ISAC-II ISAC-II is a post-accelerator and radioactive ion beam facility at TRIUMF on Vancouver Island in British Columbia, Canada. It extends the capabilities of the ISAC complex to higher energies for studies in nuclear physics, astrophysics, and applied sciences, enabling experiments with rare isotopes produced by proton-induced spallation and isotope separation techniques. The facility interfaces with national and international collaborations and complements other accelerators and laboratories such as CERN, RIKEN, GANIL, GSI Helmholtz Centre for Heavy Ion Research, and Brookhaven National Laboratory.

Overview

ISAC-II operates as a superconducting linear accelerator that receives low-energy radioactive ion beams from the ISOL system at TRIUMF, then post-accelerates them for experiments in nuclear structure and reaction studies. It was conceived alongside complementary projects at Argonne National Laboratory and Oak Ridge National Laboratory to provide high-quality rare-isotope beams for experiments similar to those at Facility for Rare Isotope Beams and RI Beam Factory. The program supports collaborations with institutions such as University of British Columbia, University of Manitoba, McGill University, Simon Fraser University, University of Toronto, York University, and international partners including University of Liverpool and University of Warsaw.

Design and Technical Specifications

ISAC-II uses a superconducting linac architecture based on niobium resonators and cryomodules similar to designs used at CERN's ISOLDE upgrade and FRIB technology developments. Its radio-frequency quadrupole (RFQ) and drift tube linac predecessors in ISAC-I feed the superconducting quarter-wave and half-wave resonators that accelerate beams to several MeV per nucleon. Beam optics employ magnetic elements manufactured to standards akin to those at DESY, SLAC National Accelerator Laboratory, and Lawrence Berkeley National Laboratory. Ancillary systems include high-voltage platform technology related to ISAC's ion sources, mass separation methods like those at TRIUMF's TITAN and ISOLDE, cryogenic refrigeration comparable to systems at CERN and DESY, and beam diagnostics inspired by JYFL Accelerator Laboratory and GANIL-SPIRAL.

Beamline and Experimental Facilities

The beamline network from ISAC-II feeds experimental stations equipped for transfer reactions, Coulomb excitation, and inverse kinematics measurements used by collaborations with groups from Los Alamos National Laboratory, Argonne National Laboratory, Lawrence Livermore National Laboratory, and Stony Brook University. Detectors and spectrometers deployed include devices of heritage similar to TIGRESS, GAMMASPHERE, SHARC, EMMA, and DRAGON setups. Ancillary instrumentation connects with ion trapping and precision mass measurement efforts like TITAN and TRIUMF's ARIEL program. Solid target stations and gas cells echo technologies used at GANIL, RIKEN, and ISOLDE, while focal-plane arrays and recoil separators resemble implementations at TRIUMF and MSU NSCL.

Research Programs and Applications

Programs enabled by ISAC-II span nuclear structure, nuclear astrophysics, and applied isotopes research that support communities at Canadian Light Source, Universidad Nacional Autónoma de México, Max Planck Institute for Nuclear Physics, and Imperial College London. Scientific themes include mapping shell evolution and collectivity studied by groups linked to Michigan State University, University of Notre Dame, Ohio State University, University of Edinburgh, and KU Leuven; nucleosynthesis pathways relevant to the r-process and s-process researched by teams from Monash University, Trinity College Dublin, UNAM, and University of Tokyo; and measurements of weak interaction properties pursued in conjunction with researchers at Weizmann Institute of Science and University of Oxford. Applied work includes isotope production and materials analysis used by industry partners and medical isotope initiatives similar to projects at CERN-MEDICIS and Institut Laue–Langevin.

Construction and Commissioning

Construction drew on expertise from engineering groups experienced with projects at CERN, GSI, RIKEN, and JLab. Cryomodule fabrication and cavity tuning employed suppliers and design practices comparable to those used by TRIUMF collaborators and contractors common to Brookhaven National Laboratory and Los Alamos National Laboratory. Commissioning phases included beam tuning and energy verification campaigns reminiscent of procedures at FRIB and ISOLDE, with experiments performed by consortia from McMaster University, University of Victoria, University of Calgary, and University of Manitoba to validate beam properties and detector performance. Safety and radiation protection standards followed regulatory frameworks in Canada and operational models from CERN and IAEA-informed practices.

Operations and Upgrades

Operational management integrates scheduling, target-ion-source optimization, and beam delivery coordinated with national user programs and agreements involving NSERC-funded groups and international collaborators from ANL, LLNL, LANL, and RIKEN. Upgrades underway or planned have included enhancements to superconducting cavities, increased cryogenic capacity, new beam diagnostics, and expanded experimental halls, drawing on technology roadmaps shared with FRIB, ISOLDE, GANIL, and GSI upgrade projects. Ongoing development work engages engineering teams from University of British Columbia, TRIUMF technical divisions, and partner labs to support future campaigns in precision spectroscopy, reaction dynamics, and applied isotope research.

Category:Particle accelerators Category:Nuclear physics facilities