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Newsletter, Fall 2011, College Of Arts And Sciences
Newsletter, Fall 2011, College Of Arts And Sciences
Physics Newsletter
Contents from Vol 8, No. 1 of the Newsletter for Friends of the Western Michigan University Department of Physics:
- News
- Staff News
- Faculty News
- Alumni News
- Student News
- Department of Physics Roster
Modeling Of A Photonic Crystal Waveguide Modes With The Fdtd Method, Buddhi Rai
Modeling Of A Photonic Crystal Waveguide Modes With The Fdtd Method, Buddhi Rai
The Hilltop Review
The electromagnetic modes are investigated using a simple 1D implementation of the FDTD numerical algorithm to a model of 1D photonic crystal. The fields Ez and Hy are simulated along the x-axis, the propagation direction. Source implementation and the effects of various boundary conditions such as ABC, Mur on TF-SF fields are investigated. Of particular focus in this paper is, for example, on investigating the guided and/or radiation modes at a stop band frequency of the photonic crystal formed of linear and Kerr nonlinear media. Such structures exhibit interesting transmission and reflection properties that make them suitable for …
Newsletter, Spring 2011, College Of Arts And Sciences
Newsletter, Spring 2011, College Of Arts And Sciences
Physics Newsletter
Contents of Vol 7, No. 2 of the Newsletter for Friends of the Western Michigan University Department of Physics:
- News
- Staff News
- Alumni News
- Student News
- Department of Physics Roster
- Feedback Form
Research Report 2011, Western Michigan University
Research Report 2011, Western Michigan University
Physics Research Reports
- Introduction
- From the Chairperson
- Atomic and Molecular Physics
- Condensed Matter Physics
- Nuclear Physics
- Physics Education
- Research and Public Lectures at WMU
- Personnel January 1- December 31, 2011
Relativistic R-Matrix Theory, Janina Grineviciute
Relativistic R-Matrix Theory, Janina Grineviciute
Dissertations
We have developed a relativistic coupled{channel reaction theory in which binary break-up channels satisfy a relative Dirac equation. This theory is developed by extending the R-matrix formalism of Lane and Thomas to the relativistic case and implementing the Dirac oscillator basis. The motivation for this project is testing po- tentials for the dense matter calculations and generating relativistic wave functions for the nal states in the knockout reactions. As an example of the formalism we have calculated observables for the proton scattering on light-to-medium weight nuclei in the relativistic impulse approximation using the relativistic Love-Franey amplitudes of Horowitz. The R-matrix …
Commissioning Of The Helical Orbit Spectrometer: A New Device For Measuring Nuclear Reactions In Inverse Kinematics, Jonathan C. Lighthall
Commissioning Of The Helical Orbit Spectrometer: A New Device For Measuring Nuclear Reactions In Inverse Kinematics, Jonathan C. Lighthall
Dissertations
The Helical Orbit Spectrometer (HELIOS) at Argonne National Laboratory is the first implementation of a radical new concept for measuring nuclear reactions. Direct nuclear transfer reactions are powerful tools for studying the properties of the atomic nucleus. A traditional example is the neutron-transfer reaction (d ,p), wherein an accelerated beam of deuterons d bombards a heavy target. The incoming deuteron transfers a neutron to the target nucleus and the outgoing proton p is detected to study the properties of the residual heavy nucleus. A new frontier of nuclear reaction studies involving short-lived exotic nuclei—which are unsuitable for use …
Electron Transmission Characteristics And The Production Of Narrow Beams Using Glass Optics, Buddhika Senarath Dassanayake
Electron Transmission Characteristics And The Production Of Narrow Beams Using Glass Optics, Buddhika Senarath Dassanayake
Dissertations
Transmission of electrons through an insulating single cylindrically-shaped glass capillary of microscopic dimension has been investigated. Samples made with Borosilicate glass (PYREX 7740) were subjected to bombardment of 300-1000 eV electrons. Transmitted electrons were analyzed using a parallel-plate spectrometer coupled to a channel electron multiplier.
The transmitted electron intensity was found to decrease with increasing sample tilt angle relative to the direction of the primary beam. Two regions of transmission were found: direct where there is no interaction of the beam with the inner capillary wall, and indirect where the beam does interact with the wall. The rate of transmission …