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A Clash of Clusters Provides New Clue to Dark Matter
Special ACKS Seminar: Dragan Huterer
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ACKS Seminar (Theory Colloquium): Warren Mori (UCLA)
| What | seminar ACKS |
|---|---|
| When |
17 May 07 from 04:00 pm to 05:30 pm |
| Where | Campus: Phys & Astro Bldg 1st fl conf rm (102/103) |
| Contact Name | Ted Baltz (KIPAC) |
| Contact Email | eabaltz@slac.stanford.edu |
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Recent advances in the understanding and control of plasma-based acceleration
Abstract
In plasma based acceleration an intense beam of photons or charged particles is sent through a plasma. The radiation pressure of the laser or the space field of the beam pushes plasma electrons forwards and sideways. These electrons are attracted back to the axis by the ions. They overshoot thereby creating a highly nonlinear wakefield structure that moves with the speed of the drive beam which is near the speed of light. The accelerating fields in these wakes can exceed 1 GeV/cm which is over three orders of magnitude higher than existing accelerator technology. Recent experiments on laser- driven acceleration at LBL have reported the generation of mono- energetic beams at 1 GeV in 1cm while experiments at SLAC on beam driven acceleration have reported over 40 GeV energy gain in less than 1 meter. Furthermore, using sophisticated particle based computer models the full scales of these experiments can be modeled in three-dimensions. In this talk, I will briefly describe the status of these experiments and then discuss recent progress in the theoretical understanding of the structure of three-dimensional wakes, of how these wakes are excited, and of how the energy of these wakes is absorbed by the accelerated electrons. These processes will be illustrated using results from three dimensional particle-in-cell simulations. Time permitting, I will discuss the key issues that need to be addressed in order that these techniques be used to meet the energy frontier for high-energy physics.
MASS: Lance Simms