Dresden 2020 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 8: New Accelerator Concepts

AKBP 8.6: Talk

Tuesday, March 17, 2020, 15:45–16:00, HSZ 301

Controlled Plasma Generation for Beam-Driven Wakefield Acceleration — •Gabriele Tauscher^1,2, Lucas Schaper¹, Matthew James Garland¹, Bernhard Schmidt^1,2, Kristjan Poder¹, Lars Goldberg², Jan-Patrick Schwinkendorf¹, Gregory Boyle¹, Pardis Niknejadi¹, Theresa Brümmer¹, Simon Bohlen^1,2, Alexander Knetsch¹, Martin Meisel^1,2, Sarah Schroeder^1,2, Bridget Sheeran^1,2, Theresa Staufer¹, and Jens Osterhoff¹ — ¹Deutsches Elektronen-Synchrotron DESY — ²Hamburg University

Plasma targets required for wakefield acceleration rely on establishing specific electron density distributions in longitudinal and transverse direction to allow for preservation of beam quality during the acceleration of electron bunches. In the FLASHForward project an electron bunch from the FLASH linac drives large amplitude wakefields in a pre-ionised plasma. The plasma can be generated by a multi-TW short-pulse laser or a high-current HV discharge. Especially in complex scenarios, where multiple gas species can be involved, the strength of the plasma generating source has to be adjusted to accommodate for the specific ionisation thresholds to e.g. generate strong gradient down ramps. To assess the plasma density distribution across the target experimentally, targets are investigated by different interferometry and spectroscopy. The comprehension of the underlying processes of laser and discharge induced plasma generation allows us to control and tailor plasma shapes.