A5004724502- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Atomic and Molecular Physics
- Magnetic confinement fusion research
- Atomic and Subatomic Physics Research
- Advanced Chemical Physics Studies
- Particle Detector Development and Performance
- Plasma Diagnostics and Applications
- Nuclear Physics and Applications
- Radiation Effects in Electronics
- Isotope Analysis in Ecology
- Superconducting Materials and Applications
- Scientific Measurement and Uncertainty Evaluation
- Muon and positron interactions and applications
- Ionosphere and magnetosphere dynamics
- Radioactive Decay and Measurement Techniques
- Parallel Computing and Optimization Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Numerical Methods and Algorithms
- Distributed and Parallel Computing Systems
- Advanced NMR Techniques and Applications
- Solid-state spectroscopy and crystallography
- Medical Imaging Techniques and Applications
- Astronomical and nuclear sciences
TRIUMF
2018-2025
University of Victoria
2021-2024
McGill University
2011-2015
An activity of the TRIUMF automatic beam tuning program, Bayesian optimization for Ion Steering (BOIS) method has been developed to perform corrective centroid steering beams at ISAC facility. BOIS exclusively controls steerers correction after transverse optics have set according theory. The is fully online, easy deploy, and tested in low energy post-accelerated ISAC, achieving results comparable human operators. scaleBOIS boundBOIS are naïve proof-of-concept solutions preferably select...
Collinear laser spectroscopy was performed on the nuclear ground states of neutron-deficient isotopes $^{206,205,204}\mathrm{Fr}$. A new technique developed to suppress hyperfine pumping in collinear atoms. This involved high-frequency intensity modulation narrow-linewidth light using fast-switching electro-optical modulators. The ground-state spins $^{206,205,204}\mathrm{Fr}$ were determined be 3, $9/2$, and respectively. Both changes mean-squared charge radii magnetic dipole moments...
Collinear-laser spectroscopy with the bunched-beams technique was used for study of neutron deficient Rb isotopes, out to $^{74}\mathrm{Rb}$ ($N=Z=37$) at TRIUMF. The measured hyperfine coupling constants $^{76,78m}\mathrm{Rb}$ were in agreement literature values. nuclear spin $^{75}\mathrm{Rb}$ confirmed be $I=3/2$, and its first time. mean-square charge radius determined This result has improved isospin symmetry breaking correction term calculate $\mathcal{F}t$ value, implications tests...
The ratio of electric quadrupole moments 11 Li and 9 was measured using the zero-field β-detected nuclear resonance technique at TRIUMFISAC. precision on Q11/Q9 = 1.0775(12) improved by more than one order magnitude an absolute value for moment inferred. Systematic effects, as argued here, are not expected to contribute this scale. spin-lattice relaxation time 8 implanted within SrTiO3 295K in found be T1 1.73(2)s. A comparison 9,11 their is made with latest models, however, no conclusion...
To date, beam dynamics studies and design of combined zero degree drift tube linac (DTL) structures (Kombinierte Null Grad Struktur; KONUS) have only been carried out in multiparticle codes. Quantities such as the envelopes are obtained by averaging over particles, whose tracking is computationally intensive for large bunch populations. Tune computations, which depend on this average, burdensome to obtain. This has motivated implementation a simulation KONUS DTLs code transoptr, Hamiltonian...
Efficient tuning of complex accelerator chains requires automated procedures, themselves reliant upon beam physical models. The Isotope Separator and ACcelerator (ISAC) facility at TRIUMF frequent changes species (isotope), mass to charge ratio energy tailored experiment requirements, which demands rapid tuning. In addition, emergent effects such as long term or spread require optimization that must be based on a complete model the accelerator. Using an envelope code build end-to-end...
Multigap cavities are used extensively in linear accelerators to achieve velocities up a few percent of the speed light, driving nuclear physics research around world. Unlike for single-gap structures, there is no closed-form expression calculate output beam parameters from cavity voltage and phase. To overcome this, we propose use method based on integration first second moments distribution through axially symmetric time-dependent fields cavity. A beam-based calibration between model's...
Diurnal-like transmission variations in the ISAC-I warm accelerator system necessitates periodic retuning by operators. While beam loss points are well known, re-tuning nevertheless results additional downtime and reduced count rates at experiments. This has motivated development of an end-to-end simulation linear (linac) to understand characterize nature instabilities spanning several hours days.