PAC2013 - List of Authors (Emma, P.)

Paper

Title

Page

Simulation of an X-band Hard X-ray FEL with LCLS Injector

264

Y. Sun
ANL, Argonne, USA
P. Emma
LBNL, Berkeley, California, USA
T.O. Raubenheimer
SLAC, Menlo Park, California, USA

In this note, it is briefly discussed the accelerator design and start-to-end 3D macro particles simulation (using {\small ELEGANT} and {\small GENESIS}) of an X-band RF driven hard X-ray FEL with LCLS injector. A preliminary design and LiTrack 1D simulation studies were presented before in an older publication~[chris]. In numerical simulations this X-band RF driven hard X-ray FEL achieves/exceeds LCLS-like performance in a much shorter overall length of 350 m, compared with 1200 m in the LCLS case. One key feature of this design is that it may achieve a higher final beam current of 5 kA plus a uniform energy profile, mainly due to the employment of stronger longitudinal wake fields in the last X-band RF linac~[tor].

MOPHO15

X-band FEL Driver Linac Design with Optics Linearization

273

Y. Sun
ANL, Argonne, USA
P. Emma
LBNL, Berkeley, California, USA
T.O. Raubenheimer, J. Wu
SLAC, Menlo Park, California, USA

In this paper, a compact hard X-ray FEL design is proposed with a single bunch charge of 250 pC, which is based on all X-band RF acceleration and two stage bunch compression. It eliminates the need of a harmonic RF linearization section by employing optics linearization in its first stage bunch compression. Emittance growth in the horizontal plane due to CSR is investigated and minimized, to be on a similar level with the LCLS. An electron bunch distribution at the linac end is taken as the input for an FEL simulation in GENESIS, with a beam energy of 7 GeV. At an FEL radiation wavelength of 0.15 nm, a saturation length of roughly 40 meters can be achieved by employing an undulator with a period of 1.5 cm. Without tapering, an FEL radiation power above 10 GW is achieved with a photon pulse length of 50 fs, which is LCLS-like performance. The overall length of the accelerator plus undulator is around 250 meters which is much shorter than the LCLS length of 1230 meters.

WEOAA1

NGLS - A Next Generation Light Source

J.N. Corlett, A.P. Allezy, D. Arbelaez, J.M. Byrd, C.S. Daniels, S. De Santis, W.W. Delp, P. Denes, R.J. Donahue, L.R. Doolittle, P. Emma, D. Filippetto, J.G. Floyd, J.P. Harkins, G. Huang, J.-Y. Jung, D. Li, T.P. Lou, T.H. Luo, G. Marcus, M.T. Monroy, H. Nishimura, H.A. Padmore, C. F. Papadopoulos, G.C. Pappas, S. Paret, G. Penn, M. Placidi, S. Prestemon, D. Prosnitz, H.J. Qian, J. Qiang, A. Ratti, M.W. Reinsch, D. Robin, F. Sannibale, R.W. Schoenlein, C. Serrano, J.W. Staples, C. Steier, C. Sun, M. Venturini, W.L. Waldron, W. Wan, T. Warwick, R.P. Wells, R.B. Wilcox, S. Zimmermann, M.S. Zolotorev
LBNL, Berkeley, California, USA
C. Adolphsen, K.L.F. Bane, Y. Ding, Z. Huang, C.D. Nantista, C.-K. Ng, H.-D. Nuhn, C.H. Rivetta, G.V. Stupakov
SLAC, Menlo Park, California, USA
D. Arenius, G. Neil, T. Powers, J.P. Preble
JLAB, Newport News, Virginia, USA
C.M. Ginsburg, R.D. Kephart, A.L. Klebaner, T.J. Peterson, A.I. Sukhanov
Fermilab, Batavia, USA

Funding: Work supported by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
We present an overview of design studies and R&D toward NGLS a Next Generation Light Source initiative at LBNL. The design concept is based on a multi-beamline soft x-ray FEL array powered by a CW superconducting linear accelerator, and operating with a high bunch repetition rate of approximately 1 MHz. The linac design uses TESLA and ILC technology, supplied by an injector based on a CW normal-conducting VHF photocathode electron gun. Electron bunches from the linac are distributed by RF deflecting cavities to the array of independently configurable FEL beamlines with nominal bunch rates of ~100 kHz in each FEL, with uniform pulse spacing, and some FELs capable of operating at the full linac bunch rate. Individual FELs may be configured for different modes of operation, including self-seeded and external-laser-seeded, and each may produce high peak and average brightness x-rays with a flexible pulse format.

Slides WEOAA1 [6.908 MB]

Paper	Title	Page
MOPHO12	Simulation of an X-band Hard X-ray FEL with LCLS Injector	264
	Y. Sun ANL, Argonne, USA P. Emma LBNL, Berkeley, California, USA T.O. Raubenheimer SLAC, Menlo Park, California, USA
	In this note, it is briefly discussed the accelerator design and start-to-end 3D macro particles simulation (using {\small ELEGANT} and {\small GENESIS}) of an X-band RF driven hard X-ray FEL with LCLS injector. A preliminary design and LiTrack 1D simulation studies were presented before in an older publication~[chris]. In numerical simulations this X-band RF driven hard X-ray FEL achieves/exceeds LCLS-like performance in a much shorter overall length of 350 m, compared with 1200 m in the LCLS case. One key feature of this design is that it may achieve a higher final beam current of 5 kA plus a uniform energy profile, mainly due to the employment of stronger longitudinal wake fields in the last X-band RF linac~[tor].

MOPHO15	X-band FEL Driver Linac Design with Optics Linearization	273
	Y. Sun ANL, Argonne, USA P. Emma LBNL, Berkeley, California, USA T.O. Raubenheimer, J. Wu SLAC, Menlo Park, California, USA
	In this paper, a compact hard X-ray FEL design is proposed with a single bunch charge of 250 pC, which is based on all X-band RF acceleration and two stage bunch compression. It eliminates the need of a harmonic RF linearization section by employing optics linearization in its first stage bunch compression. Emittance growth in the horizontal plane due to CSR is investigated and minimized, to be on a similar level with the LCLS. An electron bunch distribution at the linac end is taken as the input for an FEL simulation in GENESIS, with a beam energy of 7 GeV. At an FEL radiation wavelength of 0.15 nm, a saturation length of roughly 40 meters can be achieved by employing an undulator with a period of 1.5 cm. Without tapering, an FEL radiation power above 10 GW is achieved with a photon pulse length of 50 fs, which is LCLS-like performance. The overall length of the accelerator plus undulator is around 250 meters which is much shorter than the LCLS length of 1230 meters.

WEOAA1	NGLS - A Next Generation Light Source
	J.N. Corlett, A.P. Allezy, D. Arbelaez, J.M. Byrd, C.S. Daniels, S. De Santis, W.W. Delp, P. Denes, R.J. Donahue, L.R. Doolittle, P. Emma, D. Filippetto, J.G. Floyd, J.P. Harkins, G. Huang, J.-Y. Jung, D. Li, T.P. Lou, T.H. Luo, G. Marcus, M.T. Monroy, H. Nishimura, H.A. Padmore, C. F. Papadopoulos, G.C. Pappas, S. Paret, G. Penn, M. Placidi, S. Prestemon, D. Prosnitz, H.J. Qian, J. Qiang, A. Ratti, M.W. Reinsch, D. Robin, F. Sannibale, R.W. Schoenlein, C. Serrano, J.W. Staples, C. Steier, C. Sun, M. Venturini, W.L. Waldron, W. Wan, T. Warwick, R.P. Wells, R.B. Wilcox, S. Zimmermann, M.S. Zolotorev LBNL, Berkeley, California, USA C. Adolphsen, K.L.F. Bane, Y. Ding, Z. Huang, C.D. Nantista, C.-K. Ng, H.-D. Nuhn, C.H. Rivetta, G.V. Stupakov SLAC, Menlo Park, California, USA D. Arenius, G. Neil, T. Powers, J.P. Preble JLAB, Newport News, Virginia, USA C.M. Ginsburg, R.D. Kephart, A.L. Klebaner, T.J. Peterson, A.I. Sukhanov Fermilab, Batavia, USA
	Funding: Work supported by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 We present an overview of design studies and R&D toward NGLS a Next Generation Light Source initiative at LBNL. The design concept is based on a multi-beamline soft x-ray FEL array powered by a CW superconducting linear accelerator, and operating with a high bunch repetition rate of approximately 1 MHz. The linac design uses TESLA and ILC technology, supplied by an injector based on a CW normal-conducting VHF photocathode electron gun. Electron bunches from the linac are distributed by RF deflecting cavities to the array of independently configurable FEL beamlines with nominal bunch rates of ~100 kHz in each FEL, with uniform pulse spacing, and some FELs capable of operating at the full linac bunch rate. Individual FELs may be configured for different modes of operation, including self-seeded and external-laser-seeded, and each may produce high peak and average brightness x-rays with a flexible pulse format.
	Slides WEOAA1 [6.908 MB]