Conveners
PS2: High gradient vacuum structures
- Evan Ericson (PSI/EPFL)
- Jom Luiten
PS2: High gradient vacuum structures
- Evan Ericson (PSI/EPFL)
- Jom Luiten
Accelerator user facility CLARA (Compact Linear Accelerator for Research and Applications) at Daresbury Laboratory is currently being commissioned. It comprises a 250MeV, 250pC linear accelerator and a dedicated beamline with the hutch for hosting a variety of user experiments including plasma and structure wakefield acceleration. Generation of drive-main bunch pairs for wakefield experiments...
The bandwidth of a free-electron laser (FEL) is increased when the mean energy along the electron bunch varies. In this work, we demonstrate how a dielectric wakefield structure can be used to control the FEL bandwidth by manipulating the beam’s energy chirp prior to its injection into undulators. We compare simulations and measurements of the beam’s energy spread distribution and find...
Structure wakefield acceleration (SWFA) is a promising novel acceleration method being explored to develop more compact and cost-effective future accelerators. In SWFA, a high-charge drive bunch travels through a structure, exciting strong wakefields that can be used to accelerate a trailing lower-charge main bunch. A major challenge in this scheme is beam break-up (BBU) instability, which can...
An experiment at the Argonne Wakefield Accelerator toward implementing an energy recovery scheme in a beam-driven structure wakefield accelerator is in preparation. The experiment use a drive and locaing bunch to excite and turn of the wakefield. Such a configudation allows the generation of short THz pulse (below the one imposed by the structure group velocity) and could provide a phath the...
AWAKE is constructing a new electron injector for external injection for Run 2C. One of the main goals of the experiment is to demonstrate external injection into a plasma wake field and emittance and energy spread control during acceleration. The injector consists of an S-band high gradient RF-gun and high-gradient X-band accelerating structures for velocity bunching and acceleration. The...
In dielectric laser acceleration (DLA), well known accelerator concepts are applied at a much smaller length scale. While classical accelerators use radiofrequency cavities, dielectric laser accelerators utilize dielectric nano-structures driven by strong infrared femtosecond laser pulses. Due to the high damage threshold of dielectric materials, acceleration gradients up to one or two orders...
The potential of Dielectric Laser Accelerators [1] is currently limited due to the low bunch charges typically achieved. This is because the small lateral sizes of the accelerating structures pose strict requirements on the injection beam. A bunched low emittance beam is thus required for reasonable injection efficiency. We propose a compact low-energy design of an electron injector based on...
We demonstrate the application of THz-frequency acceleration in the control of the chirp of an electron beam supplied by an RF linac injector. An ultrafast Ti:Sapphire laser drives the THz source, enabling a direct link between laser and electron beam timing and temporal-locking between laser and electron bunch arrival time. The accelerating structures high drive frequency results in a high...
