Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.
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Simulation of Vector Mode Grating Coupler Interfaces for Integrated Optics

C. T. Nadovich [1],
[1] Lafayette College, Easton, PA, USA

The use of grating couplers to couple conventionally phased and polarized light near vertically in and out of optical slab or film waveguides [1] represents an attractive method to interface optical fiber to photonic ICs. Previously developed grating coupler designs use transversely uniform grating structures matched to conventional scalar fiber modes. The performance of these geometries can be ...

A Novel Mechanical Stress Measurement Method Applied to Wind Turbine Rotor Blades

A.H. Hegab[1], J.P. Kaerst[1]
[1]HAWK, University of Applied Sciences and Arts, Goettingen, Germany

Rotor blades for wind turbines are made of GFRP material. They have to be designed to withstand wind and weather over their approximately 20 years of lifetime. The ability to monitor the mechanical stress is crucial in order to reduce maintenance costs and to maximize operational availability. This paper presents the combination of SPICE® and COMSOL Multiphysics®, in order to reduce ...

Key-Holes Magnetron Design and Multiphysics Simulation

A. Leggieri[1], F. Di Paolo[1], D. Passi[1]
[1]Univeristy of Rome "Tor Vergata" - Department of Electronic Engineering, Rome, Italy

This paper describes the design and characterization of an 8 slots resonant cavity Magnetron, which undergoes thermal-structural effects due to cathode heating. The proposed study involves Thermal Stress, Eigen-frequency and Particle Tracing analysis based on COMSOL Multiphysics®. Magnetrons are well known and often utilized High Power Radiofrequency Vacuum Tube oscillators. In order to ...

Uncertainty of FEM Solutions Using a Nonlinear Least Squares and Design of Experiments Approach

J. T. Fong [1], N. A. Heckert [1], J. J. Filliben [1], P. V. Marcal [2], R. Rainsberger [3]
[1] National Institute of Standards and Technology, Gaithersburg, MD, USA
[2] MPACT Corp., Oak Park, CA, USA
[3] XYZ Scientific Applications, Inc., Livermore, CA, USA

Uncertainty in COMSOL Multiphysics® software simulations due to (a) model parameter uncertainties and (b) mesh-induced truncation errors, is estimated using a design-of-experiments approach [1, 2, 3], and a nonlinear least squares logistics fit method [4, 5], respectively. Examples to illustrate both approaches are given using the COMSOL RF Module (in an application of a MRI coil design) and ...

Photonic Crystal Fibers for Visible Light Generation

D. Aydin [1], S. J. Cordette [1], C. Brès [1],
[1] EPFL, Lausanne, Vaud, Switzerland

There has been a growing interest in optical parametric amplifiers (OPA) for light generation and amplification in because of the possibility for arbitrary operation wavelength and wideband tenability [1]. PCFs are of particular interest in such nonlinear optics applications because of the enhanced light confinement and the resultant high nonlinearity (γ) achievable with air-cladded designs. ...

Design of RF Power Couplers for Accelerator Cavities using COMSOL Multiphysics®

R. Kumar [1],
[1]Bhabha Atomic Research Centre, Mumbai, India

High-power couplers (both coaxial and ridge waveguide type) at UHF frequencies are presently under development for the Low Energy High Intensity Proton Accelerator (LEHIPA) project and 1 GeV proton accelerator at Bhabha Atomic Research Centre. Ridge waveguide coupler transitions the WR2300 waveguide input to a smaller size ridge waveguide. An iris is used in the end wall/side wall of the ...

FEM Based Design and Simulation Tool for MRI Birdcage Coils Including Eigenfrequency Analysis

N. Gurler[1], Y. Ziya Ider[1]
[1]Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey

Designing a Radio Frequency (RF) birdcage coil used in Magnetic Resonance Imaging (MRI) at high frequencies where the wavelength is comparable with the coil dimensions is a challenging task. Before construction of the coil, not only calculating the capacitance value which is necessary for the coil to resonate at the desired frequency but also geometrically modeling the coil in a 3D simulation ...

Analysis and Development of Koch Fractal Dipole Antennas - new

V. S. Wildner[1], M. G. Vanti[1]
[1]Regional University of Blumenau - FURB, Blumenau, SC, Brazil

Devices of mobile communication require smallest sizes of antennas. This is one of the applications of fractal antennas which have reduced size or are multiband and can be used for mobile phone, RFID, Wi-Fi, digital TV, among other applications. The Koch fractal geometry allows better space filling, then it is possible to build antennas electrically longer than linear antennas that have the ...

Antenna and Plasmonic Properties of Scanning Probe Tips at Optical and Terahertz Regimes - new

A. Haidary[1], P. Grütter[1], Y. Miyahara[1]
[1]Physics Department, McGill University, Montreal, QC, Canada

A wide variety of near-field optical phenomena such as apertureless near-field scanning microscopy (ANSM) at optical and terahertz (THz) regimes and surface enhanced Raman scattering relies on the electric field enhancement at the end of a sharp tip. Achieving and controlling this electric field enhancement is a key challenge for a wide range of applications such as surface modification, data ...

Multiphysics Design of a Klystron Buncher

A. Leggieri [1], D. Passi [1], F. Di Paolo [1], G. Saggio [1]
[1] University of Rome, Rome, Italy

The Multiphysics design of a 130 GHz klystron Buncher cavity is described in this paper. In this high frequency range, dimensions are critical and expose the device to multiple physics effects, due to the power dissipations, affecting the electromagnetic performances. The proposed device is integrated with a carbon nanotube cold cathode in order to reduce thermal expansion and an opportune ...