Dresden 2014 – scientific programme

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BE: Beschleunigerphysik

BE 3: New Accelerator Concepts

BE 3.9: Talk

Tuesday, April 1, 2014, 12:15–12:30, MOL 213

Controlled injection of plasma electrons into a beam-driven wakefield using the density down-ramp technique at Facility for Advanced Accelerator Experimental Tests (FACET) — •Olena Kononenko, Christopher Behrens, John Dale, Julia Grebenyuk, Vladyslav Libov, Timon Mehrling, Alberto Martinez de la Ossa, Halil Olgun, Charlotte Palmer, Lucas Schaper, and Jens Osterhoff — DESY, Hamburg, Germany

Plasma wakefields can sustain high field gradients (> 10 GV/m) allowing particle acceleration to ultrarelativistic energies over small distances (few mm). Control over the electron bunch phase-space during the process of injection into the accelerating wakefield is of crucial importance for the production of electron beams in plasma-based schemes. Shaping of the longitudinal plasma-density profile has been proposed as a method of achieving controlled injection. In this report, we describe the study of density down-ramp injection into a beam-driven plasma wakefield which will be explored at the FACET facility.

For the planned experiments at FACET, suitable target density profiles with a low-density plateau region, preceded by a high-density peak are required. The basic target is designed as a capillary tube with inlets along its length. The peak region is achieved by an external gas jet. This gas jet must be operated in pulsed mode to reduce the gas load into the main vacuum of FACET.

Here the goals and preparation for the experiment are presented, including particle-in-cell and hydrodynamic simulations of the tailored target.