USTRAT/SUPA, Glasgow, United Kingdom
University of Oslo, Oslo, Norway
CERN, Geneva, Switzerland
UCLA, Los Angeles, California, USA
RadiaBeam, Santa Monica, California, USA
Cockcroft Institute, Warrington, Cheshire, United Kingdom
RadiaSoft LLC, Boulder, Colorado, USA
Tech-X, Boulder, Colorado, USA
SLAC, Menlo Park, California, USA
The University of Texas at Austin, Austin, Texas, USA
DESY, Hamburg, Germany
University of Hamburg, Hamburg, Germany
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
Colorado University at Boulder, Boulder, Colorado, USA
TXUK, Warrington, United Kingdom
Plasma accelerators support accelerating fields of 100's of GV/m over meter-scale distances and routinely produce femtosecond-scale, multi-kA electron bunches. The so called Trojan Horse underdense photocathode plasma wakefield acceleration scheme combines state-of-the-art accelerator technology with laser and plasma methods and paves the way to improve beam quality as regards emittance and energy spread by many orders of magnitude. Electron beam brightness levels exceeding 1020 Am-2 rad-2 may be reached, and the tunability allows for multi-GeV energies, designer bunches and energy spreads <0.05% in a single plasma accelerator stage. The talk will present results of the international E210 multi-year experimental program at SLAC FACET, which culminated in successful first demonstration of the Trojan Horse method during FACET's final experimental run in 2016. Enabling implications for applications, including high performance plasma-based 5th generation light sources such as hard x-ray FEL's, for which start-to-end simulations are presented, and for high energy physics are discussed.
SLAC, Menlo Park, California, USA
FACET-II will be a new test facility, starting construction in 2018 within the main SLAC Linac. Its purpose is to build on the decades-long experience developed conducting accelerator R&D at SLAC in the areas of advanced acceleration and coherent radiation techniques with high-energy electron and positron beams. The positron system design utilizes an existing W-Re target in Linac Sector 19, driven by 4 nC electrons bunches at 10 GeV. We present the design of a 335 MeV, 21.4 m circumference damping ring required to damp emittance from a modified positron return beamline by a factor of 500. The transverse emittance is calculated to be 6 um-rad, fully coupled, with a bunch length of 4 mm and energy spread 0.06 %, at a bunch charge of 1 nC. The arc magnets need to be especially compact due to tight space constraints (installation will be in the existing SLAC Linac tunnel, Sector 10, with 3 m width available) and were a key design challenge. We present a solution with combined function bend/quadrupole/sextupole magnets which have been modelled in 3D using Opera.