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<div align="center"><font color="navy"><b>Old Dominion University</b></font></div>
<div align="center"><font color="navy"><b>Department of Physics</b></font></div>
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<div align="center"><font color="#31849B"><b>Fall Colloquium Series</b></font></div>
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<div align="center"><font size="5" color="#17365D"><b>Tuesday October 16, 2012</b></font></div>
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<div align="center"><font size="5" color="#31849B"><b>"Energy Spread Reduction of Electron Beams Produced From Laser Wakefield Acceleration"</b></font></div>
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<font face="Times New Roman" size="5"><b>Dr. Bradley Pollock</b></font></font></div>
<div align="center"><font size="5" color="#1F497D"><b>Lawrence Livermore National Laboratory</b></font></div>
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<div align="left"><font size="3" color="#1F497D">Conventional RF linear accelerators produce high energy electron beams (10's of GeV) over kilometer-scale distances, where the long length is due to the
maximum electric field these devices can generate without damaging the accelerator (10's MeV/m). The Laser Wakefield Acceleration mechanism provides a platform for producing high energy electron beams over centimeter-scale distances by creating an accelerating
structure in a plasma capable of supporting ~GeV/cm electric fields. Here a short-pulse laser drives a relativistic plasma wave in an underdense plasma which in turn accelerates electrons. We have developed a novel multi-stage accelerator which allows for narrow
energy spread electron beams to be produced at low electron densities, which are required to achieve high energy electrons from this technique. Experiments performed using the 60 fs, 200 TW Callisto laser at Lawrence Livermore National Laboratory's Jupiter
Laser Facility have demonstrated ~0.5 GeV electron beam production with 5% energy spread over 8 mm; future experiments will seek to increase the energy gain to >2 GeV in 2 cm, while reducing the energy spread to <1%.</font></div>
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<div align="center"><font size="4">Presentation: OCNPS 200 @ 3:00 pm</font></div>
<div align="center"><font size="4">Refreshments: Atrium @ 2:30 pm</font></div>
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<div align="center"><font size="5">More details at <a href="http://sci.odu.edu/physics/">http://sci.odu.edu/physics/</a></font></div>
<div align="center"><font size="5">All are Welcome!</font></div>
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