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TY - CONF AU - Gessner, S.J. AU - Adli, E. AU - Allen, J.M. AU - An, W. AU - Clarke, C.I. AU - Clayton, C.E. AU - Corde, S. AU - Delahaye, J.-P. AU - Doche, A. AU - Frederico, J.T. AU - Green, S.Z. AU - Hast, C. AU - Hogan, M.J. AU - Joshi, C. AU - Lindstrøm, C.A. AU - Lipkowitz, N. AU - Litos, M.D. AU - Lu, W. AU - Marsh, K.A. AU - Mori, W.B. AU - O'Shea, B.D. AU - Vafaei-Najafabadi, N. AU - Walz, D.R. AU - Yakimenko, V. AU - Yocky, G. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Demonstration of the Hollow Channel Plasma Wakefield Accelerator J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - 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. PB - JACoW CP - Geneva, Switzerland SP - 3202 EP - 3206 KW - plasma KW - positron KW - laser KW - acceleration KW - wakefield DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-THPPA01 UR - http://jacow.org/ipac2016/papers/thppa01.pdf ER -