FEL2017 - List of Authors (Hall, C.C.)

Paper	Title	Page
MOP011	Strongly Tapered Undulator Design for High Efficiency and High Gain Amplification at 266 nm	49
	Y. Park, P. Musumeci, N.S. Sudar UCLA, Los Angeles, USA D.L. Bruhwiler, C.C. Hall, S.D. Webb RadiaSoft LLC, Boulder, Colorado, USA A.Y. Murokh RadiaBeam, Santa Monica, California, USA Y. Sun, A. Zholents ANL, Argonne, Illinois, USA
	Tapering Enhanced Stimulated Superradiant Amplification (TESSA) is a scheme developed at UCLA to increase efficiency of Free Electron Laser (FEL) light from less than 0.1% to above 10% using strongly tapered undulators and prebunched electron beams. Initial results validating this method have already been obtained at 10-um wavelength at Brookhaven National Laboratory. In this paper we will discuss the design of an experiment to demonstrate the TESSA scheme at high gain and shorter wavelength (266 nm) using the Linac Extension Area (LEA) beamline at the Advanced Photon Source of Argonne National Laboratory (ANL) to obtain conversion efficiencies around 10% depending on the length of the tapered undulator (up to 4m).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOP011
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TUP022	Modeling and Optimization of the APS Photo-Injector Using OPAL for High Efficiency FEL Experiments	284
	C.C. Hall, D.L. Bruhwiler, S.D. Webb RadiaSoft LLC, Boulder, Colorado, USA A.Y. Murokh RadiaBeam, Santa Monica, California, USA P. Musumeci, Y. Park UCLA, Los Angeles, USA Y. Sun, A. Zholents ANL, Argonne, Illinois, USA
	Funding: This work was carried out with support for the United State Department of Energy, Office of Scientific Research, under SBIR contract number DE-SC0017161. The Linac Extension Area (LEA) is a new beamline planned as an extension of Argonne's APS linac. An S-band 1.6-cell copper photo-cathode (PC) RF gun has been installed and commissioned at the APS linac front end. The PC gun will provide a beam to the LEA for accelerator technology development and beam physics experiments, in interleaving with a thermionic RF gun which provides a beam for APS storage ring operations. Recently an experiment was proposed to demonstrate the TESSA high-efficiency concept at LEA. In support of this experiment, we have begun simulating the photo-injector using the code OPAL (Object-oriented Particle Accelerator Library). In this paper, we first benchmark OPAL simulations with the established APS photo-injector optimization using ASTRA and ELEGANT. Key beam parameters required for a successful high-efficiency TESSA demonstration are discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-TUP022
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Strongly Tapered Undulator Design for High Efficiency and High Gain Amplification at 266 nm

49

Y. Park, P. Musumeci, N.S. Sudar
UCLA, Los Angeles, USA
D.L. Bruhwiler, C.C. Hall, S.D. Webb
RadiaSoft LLC, Boulder, Colorado, USA
A.Y. Murokh
RadiaBeam, Santa Monica, California, USA
Y. Sun, A. Zholents
ANL, Argonne, Illinois, USA

Tapering Enhanced Stimulated Superradiant Amplification (TESSA) is a scheme developed at UCLA to increase efficiency of Free Electron Laser (FEL) light from less than 0.1% to above 10% using strongly tapered undulators and prebunched electron beams. Initial results validating this method have already been obtained at 10-um wavelength at Brookhaven National Laboratory. In this paper we will discuss the design of an experiment to demonstrate the TESSA scheme at high gain and shorter wavelength (266 nm) using the Linac Extension Area (LEA) beamline at the Advanced Photon Source of Argonne National Laboratory (ANL) to obtain conversion efficiencies around 10% depending on the length of the tapered undulator (up to 4m).

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-MOP011

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP022

Modeling and Optimization of the APS Photo-Injector Using OPAL for High Efficiency FEL Experiments

284

C.C. Hall, D.L. Bruhwiler, S.D. Webb
RadiaSoft LLC, Boulder, Colorado, USA
A.Y. Murokh
RadiaBeam, Santa Monica, California, USA
P. Musumeci, Y. Park
UCLA, Los Angeles, USA
Y. Sun, A. Zholents
ANL, Argonne, Illinois, USA

Funding: This work was carried out with support for the United State Department of Energy, Office of Scientific Research, under SBIR contract number DE-SC0017161.
The Linac Extension Area (LEA) is a new beamline planned as an extension of Argonne's APS linac. An S-band 1.6-cell copper photo-cathode (PC) RF gun has been installed and commissioned at the APS linac front end. The PC gun will provide a beam to the LEA for accelerator technology development and beam physics experiments, in interleaving with a thermionic RF gun which provides a beam for APS storage ring operations. Recently an experiment was proposed to demonstrate the TESSA high-efficiency concept at LEA. In support of this experiment, we have begun simulating the photo-injector using the code OPAL (Object-oriented Particle Accelerator Library). In this paper, we first benchmark OPAL simulations with the established APS photo-injector optimization using ASTRA and ELEGANT. Key beam parameters required for a successful high-efficiency TESSA demonstration are discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-FEL2017-TUP022

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)