PAC2013 - List of Authors (Wu, J.)

Paper	Title	Page
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.

Paper

Title

Page

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.