FEL2012 - List of Authors (Ruan, J.)

Paper	Title	Page
MOPD56	Design and Commission of the Driven Laser System for Advanced Superconducting Test Accelerator	169
	J. Ruan, M.D. Church, J.K. Santucci Fermilab, Batavia, USA
	Currently an advanced superconducting test accelerator (ASTA) is being built at Fermilab. The accelerator will consist of an photo electron gun, injector, ILC-type cryomodules, multiple downstream beam lines for testing cryomodules and carrying advanced accelerator researches. In this paper we will describe the design and commissioning of the drive laser system for this facility. It consists of a fiber laser system properly locked to the master frequency, a regen-amplifier, several power amplifier and final wavelength conversion stage. We will also report the initial characterization of the fiber laser system and the current commissioning status of the laser system.

WEPD18	Potential for Laser-induced Microbunching Studies with the 3-MHz-rate Electron Beams at ASTA	409
	A.H. Lumpkin, J. Ruan Fermilab, Batavia, USA J.M. Byrd, R.B. Wilcox LBNL, Berkeley, California, USA
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. Investigations of the laser-induced microbunching as it is related to time-sliced electron-beam diagnostics and high-gain-harmonic generation (HGHG) free-electron lasers using bright electron beams are proposed for the Advanced Superconducting Test Accelerator (ASTA) facility at Fermilab. Initial tests at 40-50 MeV with an amplified 800-nm seed laser beam co-propagating with the electron beam through a short undulator (or modulator) tuned for the third-harmonic resonance condition followed by transport through a subsequent chicane will result in energy modulation and z-density modulation (microbunching), respectively. The latter microbunching will result in generation of coherent optical or UV transition radiation (COTR, CUVTR) at a metal converter screen which can reveal slice beam size, centroid, and energy spread. Additionally, direct assessment of the microbunching factors related to HGHG by measurement of the COTR intensity and harmonic content after the chicane as a function of seed laser power and beam parameters will be done. These experiments will be performed using the ASTA 1-MHz-rate micropulse train for up to 1ms which is unique to test facilities in the USA.

Paper

Title

Page

Design and Commission of the Driven Laser System for Advanced Superconducting Test Accelerator

169

J. Ruan, M.D. Church, J.K. Santucci
Fermilab, Batavia, USA

Currently an advanced superconducting test accelerator (ASTA) is being built at Fermilab. The accelerator will consist of an photo electron gun, injector, ILC-type cryomodules, multiple downstream beam lines for testing cryomodules and carrying advanced accelerator researches. In this paper we will describe the design and commissioning of the drive laser system for this facility. It consists of a fiber laser system properly locked to the master frequency, a regen-amplifier, several power amplifier and final wavelength conversion stage. We will also report the initial characterization of the fiber laser system and the current commissioning status of the laser system.

WEPD18

Potential for Laser-induced Microbunching Studies with the 3-MHz-rate Electron Beams at ASTA

409

A.H. Lumpkin, J. Ruan
Fermilab, Batavia, USA
J.M. Byrd, R.B. Wilcox
LBNL, Berkeley, California, USA

Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
Investigations of the laser-induced microbunching as it is related to time-sliced electron-beam diagnostics and high-gain-harmonic generation (HGHG) free-electron lasers using bright electron beams are proposed for the Advanced Superconducting Test Accelerator (ASTA) facility at Fermilab. Initial tests at 40-50 MeV with an amplified 800-nm seed laser beam co-propagating with the electron beam through a short undulator (or modulator) tuned for the third-harmonic resonance condition followed by transport through a subsequent chicane will result in energy modulation and z-density modulation (microbunching), respectively. The latter microbunching will result in generation of coherent optical or UV transition radiation (COTR, CUVTR) at a metal converter screen which can reveal slice beam size, centroid, and energy spread. Additionally, direct assessment of the microbunching factors related to HGHG by measurement of the COTR intensity and harmonic content after the chicane as a function of seed laser power and beam parameters will be done. These experiments will be performed using the ASTA 1-MHz-rate micropulse train for up to 1ms which is unique to test facilities in the USA.