PAC2013 - List of Authors (Threlkeld, E.W.)

Paper	Title	Page
TUPMA16	High Capture Low Energy Spread Inverse Free Electron Laser Accelerator	619
	J.P. Duris, R.K. Li, P. Musumeci, E.W. Threlkeld UCLA, Los Angeles, California, USA
	Funding: This work was supported by DOE grant DE-FG02-92ER40693, Defense of Threat Reduction Agency award HDTRA1-10-1-0073, and University of California Office of the President award 09-LR-04-117055-MUSP. We present the design and construction of a strongly period-, field-, and gap-tapered helical undulator for use in a high-gradient, high-efficiency helical IFEL experiment at Brookhaven ATF. The undulator design achieves efficient acceleration without prebunching by matching the ponderomotive and resonant energy gradients along the length of the interaction for the measured laser parameters. Simulations based on the measured undulator fields and experimental parameters suggest that as much as 43 % of a 50 MeV beam will be accelerated to 94 MeV with 2.3 % rms energy spread.

TUPSM28	Innovative Low-Energy Ultra-Fast Electron Diffraction (UED) System	697
	E.W. Threlkeld, P. Musumeci UCLA, Los Angeles, USA S. Boucher, L. Faillace, A.V. Smirnov RadiaBeam, Santa Monica, USA
	Funding: Work supported by US DOE grant # DE-SC0006274 RadiaBeam, in collaboration with UCLA, is developing an innovative, inexpensive, low-energy ultra-fast electron diffraction (UED) system which allows us to reconstruct a single ultrafast event with a single pulse of electrons. Time resolved measurement of atomic motion is one of the frontiers of modern science, and advancements in this area will greatly improve our understanding of the basic processes in materials science, chemistry and biology. The high-frequency (GHz), high voltage, phase-locked RF field in the deflector allows temporal resolution as fine as sub-100 fs. In this paper, we show the complete design of the UED system based on this concept, including initial beam measurements.

Paper

Title

Page

High Capture Low Energy Spread Inverse Free Electron Laser Accelerator

619

J.P. Duris, R.K. Li, P. Musumeci, E.W. Threlkeld
UCLA, Los Angeles, California, USA

Funding: This work was supported by DOE grant DE-FG02-92ER40693, Defense of Threat Reduction Agency award HDTRA1-10-1-0073, and University of California Office of the President award 09-LR-04-117055-MUSP.
We present the design and construction of a strongly period-, field-, and gap-tapered helical undulator for use in a high-gradient, high-efficiency helical IFEL experiment at Brookhaven ATF. The undulator design achieves efficient acceleration without prebunching by matching the ponderomotive and resonant energy gradients along the length of the interaction for the measured laser parameters. Simulations based on the measured undulator fields and experimental parameters suggest that as much as 43 % of a 50 MeV beam will be accelerated to 94 MeV with 2.3 % rms energy spread.

TUPSM28

Innovative Low-Energy Ultra-Fast Electron Diffraction (UED) System

697

E.W. Threlkeld, P. Musumeci
UCLA, Los Angeles, USA
S. Boucher, L. Faillace, A.V. Smirnov
RadiaBeam, Santa Monica, USA

Funding: Work supported by US DOE grant # DE-SC0006274
RadiaBeam, in collaboration with UCLA, is developing an innovative, inexpensive, low-energy ultra-fast electron diffraction (UED) system which allows us to reconstruct a single ultrafast event with a single pulse of electrons. Time resolved measurement of atomic motion is one of the frontiers of modern science, and advancements in this area will greatly improve our understanding of the basic processes in materials science, chemistry and biology. The high-frequency (GHz), high voltage, phase-locked RF field in the deflector allows temporal resolution as fine as sub-100 fs. In this paper, we show the complete design of the UED system based on this concept, including initial beam measurements.