A Proof-Of-Principle Echo-Enabled Harmonic Generation Experiment at SLAC

Conference · Fri May 20 04:00:00 EDT 2011 · Conf.Proc.C100523:TUPE069,2010

OSTI ID:1014113

Dunning, Michael; Colby, Eric; Ding, Yuantao; Frederico, Joel; Gilevich, Sasha; Hast, Carsten; Jobe, R; McCormick, Douglas; Nelson, Janice; Raubenheimer, Tor; Soong, Ken; Stupakov, Gennady; Szalata, Zenon; Walz, Dieter; Weathersby, Stephen; Woodley, Mark; Xiang, Dao; Corlett, John; Penn, Gregory; Prestemon, Soren ; Qiang, Ji

In this paper we describe the technical design of an ongoing proof-of-principle echo-enabled harmonic generation (EEHG) experiment at the Next Linear Collider Test Accelerator (NLCTA) at SLAC.We present the design considerations and the technical details of the experiment. Recently a new method, entitled echo-enabled harmonic generation, was proposed for generation of high harmonics using the beam echo effect. In an EEHG free electron laser (FEL), an electron beam is energy modulated in a modulator and then sent through a dispersive section with a high dispersion strength. After this first stage, the modulation obtained in the modulator is macroscopically washed out, while simultaneously introducing complicated fine structure (separated energy bands) into the phase space of the beam. A second laser is used to further modulate the beam energy in a second modulator. After passing through a second dispersive section, the separated energy bands will be converted into current modulation and the echo signal then occurs as a recoherence effect caused by the mixing of the correlations between the modulation in the second modulator and the fine structures in the beam. The EEHG scheme has a remarkable up-frequency conversion efficiency; it has been shown that the EEHG FEL scheme may allow generation of soft x-rays directly from a UV seed laser in a single stage. In order to confirm the physics behind the EEHG technique and benchmark the theory, a proof-of-principleEEHG experimentwas planned at SLAC. The experiment is now in a commissioning stage and the preliminary results are reported in a separate paper of these proceedings. In this paper we present the design considerations and the details of the experiment setup.

• Research Organization: SLAC National Accelerator Laboratory (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1014113
• Report Number(s): SLAC-PUB-14448
• Conference Information: Journal Name: Conf.Proc.C100523:TUPE069,2010
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
Accelerators
ACCPHY
SYNCHRAD
XFEL
BENCHMARKS
COMMISSIONING
DESIGN
EFFICIENCY
ELECTRON BEAMS
FINE STRUCTURE
FREE ELECTRON LASERS
HARMONIC GENERATION
HARMONICS
LASERS
LINEAR COLLIDERS
MODULATION
PHASE SPACE
PHYSICS
SEEDS
STANFORD LINEAR ACCELERATOR CENTER