A5024868933- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Acoustic Wave Resonator Technologies
- Physics of Superconductivity and Magnetism
- Muon and positron interactions and applications
- Nuclear Physics and Applications
- Microwave Engineering and Waveguides
- Metallurgy and Material Science
- Scientific Measurement and Uncertainty Evaluation
- Advancements in PLL and VCO Technologies
- Advanced Data Storage Technologies
- Digital Rights Management and Security
- Advanced Photonic Communication Systems
- Theoretical and Computational Physics
- Electrostatic Discharge in Electronics
- Sensorless Control of Electric Motors
- Photonic and Optical Devices
- Graphite, nuclear technology, radiation studies
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Real-time simulation and control systems
TRIUMF
2011-2024
Anstalt für Verbrennungskraftmaschinen List (Austria)
2024
University of Victoria
2023-2024
University of British Columbia
2013-2023
Simon Fraser University
2023
Brookhaven National Laboratory
2018
Fermi National Accelerator Laboratory
2011
Goethe University Frankfurt
2007
The Ohio State University
2002
A new high field spectrometer has been built to extend the capabilities of $\beta$-detected nuclear magnetic resonance ($\beta$-NMR) facility at TRIUMF. This beamline extension allows $\beta$-NMR spectroscopy be performed with fields up 200 mT parallel a sample's surface (perpendicular ion beam), allowing depth-resolved studies local electromagnetic spin polarized probes much higher applied than previously available in this configuration. The primary motivation and application is allow...
The performance of superconducting radiofrequency (SRF) cavities used for particle accelerators depends on two characteristic material parameters: field first flux entry ${H}_{\text{entry}}$ and pinning strength. former sets the limit maximum achievable accelerating gradient, while latter determines how efficiently can be expelled related to quality factor. In this paper, a method based muon spin rotation ($\ensuremath{\mu}\mathrm{SR}$) is developed probe these parameters samples. It...
Nb$_3$Sn is currently the most promising material other than niobium for future superconducting radiofrequency cavities. Critical fields above 120 mT in pulsed operation and about 80 CW have been achieved cavity tests. This large compared to lower critical field as derived from London penetration depth, extracted low surface impedance measurements. In this paper direct measurements of depth which superheating are presented. The first vortex measured under DC RF fields. combined results...
In this work we investigate superconducting properties of niobium samples via application the muon spin rotation/relaxation (muSR) technique. We employ for first time muSR technique to study that are cutout from large and small grain 1.5 GHz radio frequency (RF) single cell cavities. The RF test these cavities was accompanied by full temperature mapping characterize losses in each samples. Results measurements show standard cavity surface treatments like mild baking buffered chemical...
Mid-T heat treatments in the range from 250°C to 400°C on superconducting radio-frequency (SRF) cavities have been shown provide high quality factors that rise with applied rf field strength frequency, electro-polished (EP), elliptical operating at 2 K, similar nitrogen doped cavities. The factor is attributed a decrease temperature dependent part of surface resistance R BCS . Until now, no results reported for these new quarter-wave resonators (QWR) and half-wave (HWR). TRIUMF multi-mode...
ARIEL is the new TRIUMF facility for production of radioactive ion beams that will enable delivery three simultaneous RIB to ISAC experimental stations. Two additional target stations produce by using either a 50 kW proton or from 500 electrons via photofission. The electron beam driver going be MeV 10 mA CW superconducting linac. first stage e-linac installation completed and commissioning underway. paper present design characteristics, installation, strategy current results.
Recent developments in superconducting radio-frequency (SRF) research have resulted significant increases of cavity performance. Advances been made both reducing rf surface resistance and pushing the readily achievable accelerating gradient by using novel SRF treatments including processing, custom heat treatments, flux expulsion. These largely driven specific tests on single-cell elliptical cavities, while TEM cavities typically designed developed as to a project application not standard...
<div class="section abstract"><div class="htmlview paragraph">This paper gives insights in the theoretical measurement uncertainty of E-Drive rotor position dependent results, like <i>I<sub>d</sub></i> and <i>I<sub>q</sub></i> calculations, done by a modern propulsion power analyzer (PA). The calculation <i>I<sub>q</sub></i>is fundamental to perform control optimization application tasks for an system. To...
<title>Abstract</title> We report direct measurements of the magnetic field screening at limits Meissner phase for two superconducting Nb samples. The samples are processed with different surface treatments that have been developed radio-frequency cavity applications — a “baseline” treatment and an oxygen-doping (“O-doping” ) treatment. show: 1) length is significantly longer in “O-doping” sample compared to sample; 2) near increases applied field; 3) evolution profile as material...
We report direct measurements of the magnetic field screening at limits Meissner phase for two superconducting Nb samples. The samples are processed with different surface treatments that have been developed radio-frequency cavity applications -- a "baseline" treatment and an oxygen-doping ("O-doping") treatment. show: 1) length is significantly longer in "O-doping" sample compared to sample; 2) near increases applied field; 3) evolution profile as material transitions from mixed phase; 4)...
The surface resistance of superconducting radio frequency (SRF) cavities depends on the strength applied rf field. This field dependence is caused by a combination intrinsic losses and extrinsic thermal feedback (TFB) effect. To test theories dependence, part must be compensated for when analyzing experimental data from SRF cavity tests. Performing this compensation requires knowing parameters that describe heat flow in walls. relevant have been measured case superfluid helium, below 2.177...
In this contribution we present Q‐slope studies performed on about 50 low beta resonators, mainly bulk Nb quarter wave cavities built and/or tested at TRIUMF. The goal of the analysis is to look for trends in low, medium and high field (LFQS, MFQS, HFQS) regimes different cavity treatments, temperature residual resistance. We will focus comparisons then be shown between draw some conclusions including a possible hydrogen MFQS resonators.