Flashforward - Future-oriented wakefield-accelerator research and development at FLASH
IPAC 2017 - Proceedings of the 8th International Particle Accelerator Conference (2017) 1692-1695
Abstract:
FLASHForward is a beam-driven plasma wakefield acceleration facility, currently under construction at DESY (Hamburg, Germany), aiming at the stable generation of electron beams of several GeV with small energy spread and emittance. High-quality 1 GeV-class electron beams from the free-electron laser FLASH will act as the wake driver. The setup will allow studies of external injection as well as density-downramp injection. With a triangular-shaped driver beam electron energies of up to 5 GeV from a few centimeters of plasma can be anticipated. Particle-In-Cell simulations are used to assess the feasibility of each technique and to predict properties of the accelerated electron bunches. In this contribution the current status of FLASHForward, along with recent experimental developments and upcoming scientific plans, will be reviewed.Plasma wakefield accelerated beams for demonstration of FEL gain at FLASHForward
Proceedings of the 38th International Free-Electron Laser Conference, FEL 2017 (2017) 140-143
Abstract:
FLASHForward (FFV∗-) is the Future-ORiented Wakefield Accelerator Research and Development project at the DESY free-electron laser (FEL) facility FLASH. It aims to produce high-quality, GeV-energy electron beams over a plasma cell of a few centimeters. The plasma is created by means of a 25 TW Ti: Sapphire laser system. The plasma wakefield will be driven by high-current-density electron beams extracted from the FLASH accelerator. The project focuses on the advancement of plasma-based particle acceleration technology through the exploration of both external and internal witness-beam injection schemes. Multiple conventional and cutting-edge diagnostic tools, suitable for diagnosis of short electron beams, are under development. The design of the post-plasma beamline sections will be finalized based on the result of these aforementioned diagnostics. In this paper, the status of the project, as well as the progress towards achieving its overarching goal of demonstrating FEL gain via plasma wakefield acceleration, is discussed.Review of Particle Physics
IOP Publishing 40:10 (2016) 100001
Combined Electroweak and QCD Fit to HERA data
Physical Review D American Physical Society 94:5 (2016)
Abstract:
A simultaneous electroweak and QCD fit of electroweak parameters and parton distribution functions to HERA data on deep inelastic scattering is presented. The input data are neutral current and charged current inclusive cross sections measured by the H1 and ZEUS collaborations at the $ep$ collider HERA. The polarization of the electron beam was taken into account for the ZEUS and H1 data recorded between 2004 and 2007. Results are presented on the vector and axial-vector couplings of the $Z$ boson to $u-$ and $d-$type quarks. The values are in agreement with Standard Model predictions. The results on $au$ and $vu$ represent the most precise measurements from a single process.Study of HERA ep data at low Q(2) and low x(Bj) and the need for higher-twist corrections to standard perturbative QCD fits
PHYSICAL REVIEW D 94:3 (2016) ARTN 034032