Beyond injection: Trojan horse underdense photocathode plasma wakefield acceleration
Abstract Not Provided
Accelerators,ACCPHY↗
Engineering topics
Williams, O
Publications and source records attributed to Williams, O.
Preparations for a high gradient inverse free electron laser experiment at Brookhaven national laboratory
Preparations for an inverse free electron laser experiment at Brookhaven National Laboratory's Accelerator Test Facilty are presented. Details of the experimental setup including beam and laser transport optics are first discussed. Next, the driving laser pulse structure is investigated and initial diagnostics are explored and compared to simulations. Finally, planned improvements to the experimental setup are discussed.
43 PARTICLE ACCELERATORS↗
Wakefields in photonic accelerator structures
Control and manipulation of properties - such as vacuum modal confinement, spatial harmonic content, phase velocity, and group velocity - are reasons why an all-dielectric beam-driven accelerator would be expected to benefit by borrowing from the field of optical bandgap photonics. We outline the general conditions for coherent Cerenkov radiation in a photonic crystal, illustrated by three examples: two Bragg mirrors separated by a vacuum gap, a woodpile with a linear waveguide channel, and a stack of photonic slabs having a planar waveguide channel.
43 PARTICLE ACCELERATORS↗
Plasma wakefields in the quasi-nonlinear regime: Experiments at ATF
In this work we present details of planned experiments to investigate certain aspects of the quasi non linear regime (QNL) of plasma wakefield acceleration (PWFA). In the QNL regime it is, in principal, possible to combine the benefits of both nonlinear and linear PWFA. That is, beams of high quality can be maintained through acceleration due to the complete ejection of plasma electrons from beam occupied region, while large energy gains can be achieved through use of transformer ratio increasing schemes, such as ramped bunch trains. With the addition of an short focal length PMQ triplet capable of focusing beams to the few micron scale and the ability to generate tunable bunch trains, the Accelerator Test Facility (ATF) at Brookhaven National Lab offers the unique capabilities to probe these characteristics of the QNL regime.
43 PARTICLE ACCELERATORS↗
Angular spectrum characteristics of relativistic inverse compton harmonic X-rays
The X-ray spectrum emitted during relativistic non-linear inverse Compton scattering is angularly resolved, and energy analyzed through the use of K-edge and attenuation filters. A 0.5 nC electron beam of 65 MeV energy was employed, colliding with a highly intense CO{sub 2} laser of normalized vector potential a{sub L}{approx}0.5. In this experiment, 2nd harmonic radiation was clearly observed. In addition, evidence for the 3rd harmonic component of the radiation, having radiation angle of < 1/{gamma} has been found. This measurement represents a significant step forward in experimental understanding the electrodynamics of ICS in the nonlinear regime.
43 PARTICLE ACCELERATORS↗