[local physicists] Colloquium Announcement

[Malin, Delicia M.]

Old Dominion University
Department of Physics

Fall Colloquium Series

Tuesday September 13, 2011

"New Multiscale Code for Simulation of Coherent Synchrotron Radiations)"

Dr. Balsa Terzic
Jefferson Lab (CASA)

Coherent synchrotron radiation (CSR) is an effect of curvature-induced self-interaction of a microbunch with a high charge as it traverses a curved trajectory. It can cause a significant emittance degradation, as well as fragmentation and microbunching of the beam bunch. The development and optimization of the new designs for the existing and next-generation light sources crucially depends on accurate, high-resolution numerical simulations of this effect.

Direct computation of CSR wakefields in 2D and 3D are prohibitively costly in terms of efficiency and memory requirements, as they require integration over the entire history of the bunch. Consequently, the present CSR codes employ a number of approximations and simplifications that are often inadequate for resolving essential physics in many realistic situations. These situations where existing CSR codes fail are expected to become commonplace as the design of next-generation light sources commences. This provides a strong impetus for the development of the new CSR codes that are both accurate and efficient.

In this talk, I will present the progress report on the development of the fundamentally new, particle-in-cell, multiscale code for modeling CSR. The code will exploit advantages afforded by the mathematical formulation of the problem in wavelet basis: (i) retaining information about the dynamics over the hierarchy of scales spanned by the wavelet expansion; (ii) natural removal of numerical noise (denoising) by thresholding of the wavelet coefficients; (iii) compact representation of relevant data sets and operators. The resulting algorithm will be numerically optimized to run efficiently on graphical processing units (GPUs), and will be capable of modeling a number of different machines.

As a proof-of-principle, we present the early benchmark result -- a comparison against the analytical results for a rigid-line bunch.



Presentation: Physical Sciences Building II 1100 @ 3:00 pm
Refreshments: 1st Floor Atrium @ 2:30 pm

More details at http://www.physics.odu.edu
All are Welcome!


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