Paper | Title | Page |
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THPPA01 | Demonstration of the Hollow Channel Plasma Wakefield Accelerator | 3202 |
SUPSS117 | use link to see paper's listing under its alternate paper code | |
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Funding: Work supported by DOE contract DE-AC02-76SF00515. Over the past decade, there has been enormous progress in the field of beam and laser-driven plasma acceleration of electron beams. However, in order for plasma wakefield acceleration to be useful for a high-energy e+e- collider, we need a technique for accelerating positrons in plasma as well. This is a unique challenge, because the plasma responds differently to electron and positron beams, with plasma electrons being pulled through the positron beam and creating a non-linear focusing force. Here, we demonstrate a technique called hollow channel acceleration that symmetrizes the wakefield response to beams of either charge. Using a transversely shaped laser pulse, we create an annular plasma with a fixed radius of 200 μm. We observe the acceleration of a positron bunch with energies up to 33.4 MeV in a 25 cm long channel, indicating an effective gradient greater than 100 MeV/m. This is the first demonstration of a technique that way be used for staged acceleration of positron beams in plasma. |
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Slides THPPA01 [5.647 MB] | |
DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPPA01 | |
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