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<div align="center"><font size="6" color="navy"><b>Old Dominion University</b></font></div>
<div align="center"><font size="6" color="navy"><b>Department of Physics<br>
<br>
</b><font color="#548DD4"><b>Special Spring Colloquium</b></font></font></div>
<div align="center"><font size="5" color="navy"><br>
<font size="6">Thursday February 6, 2014<br>
<br>
</font><font color="#548DD4"><b>"</b></font><font color="#548DD4"><b>Space Charge Effect Simulation Using DA Based FMM and Electron Cooling Simulation for JLab’s MEIC Project</b></font><font color="#548DD4"><b>"</b></font></font></div>
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<div align="center"><font size="6" color="#244061"><b>Dr. He Zhang<br>
Jefferson Lab<br>
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<div align="left">In the first part of the talk, a method will be presented that allows the computation of space charge effects of arbitrary and large distributions of particles in an efficient and accurate way based on a variant
of the</div>
<div align="left">Fast Multipole Method (FMM). It relies on an automatic multigrid-based decomposition of charges in near and far regions and the use of high-order differential algebra (DA) methods to obtain decompositions of fields
that scales with a high power of the order. Given an ensemble of N particles, the computational expense scales as O(N). Simulation results on the photoemission process and bunch evolution during the creation of a femtosecond electron bunch will also be presented.
The second part of the talk will include a brief introduction of Jefferson Lab’s MEIC project and simulation results on its electron cooling system, which is crucial to achieve high brilliance.</div>
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<div align="center"><font size="4">Presentation: ECCS Auditorium @ 3:00 pm</font></div>
<div align="center"><font size="4">Refreshments: OCNPS 200 Atrium @ 2:30 pm</font></div>
<div align="center"><font size="5" color="#0070C0"><b>All interested persons are cordially invited to attend.</b></font></div>
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