Abstract
A Free Electron Laser (FEL) facility utilizing a recirculated Superconducting Radio Frequency (SRF) linear accelerator (linac) provides the opportunity to achieve about five times greater photon energy than an unrecirculated linac of similar cost. > A 4 GeV SRF, cw, electron linac can be used to drive an FEL producing 5 keV photons. The SLAC National Accelerator Laboratory, a Department of Energy (DOE) Basic Energy Sciences (BES) laboratory, proposes to utilize a 4 GeV unrecirculated, SRF, linac in a segment of existing linac tunnel. > For an initial investment similar to that of the proposed SLAC strategy, a recirculated SRF linac system could deliver the 4 GeV electrons for photon energies of 5 keV and provide an upgrade path to photon energies of 25 keV. > Further support amounting to about a third of the initial investment would provide upgrade funds for additional SRF linac and cryogenic capacity sufficient to provide electron energies appropriate for 25 keV photons matching the European XFEL.
Highlights
In July 2013, the Department of Energy (DOE) Basic Energy Sciences Advisory Committee (BESAC) issued a report [1] recommending a high duty factor, continuous wave free electron laser (FEL) with photon energies of about 5 keV
An initial implementation strategy could be the realization of the 5 keV facility with an upgrade path to a world-class, scientifically important 25 keV cw facility. (See, for example, Reference [2].)
An additional 5.2 GeV of single-pass superconducting radio frequency (SRF) cw electron linac could be later implemented downstream of the first linac providing 9.2 GeV electrons appropriate for photons of about 25 keV. This linear configuration would allow the electron beam to be bunched during acceleration to achieve the high peak beam current and beam emittance preservation appropriate for an efficient FEL process
Summary
An additional 5.2 GeV of single-pass SRF cw electron linac could be later implemented downstream of the first linac providing 9.2 GeV electrons appropriate for photons of about 25 keV. This linear configuration would allow the electron beam to be bunched during acceleration to achieve the high peak beam current and beam emittance preservation appropriate for an efficient FEL process. For an efficient FEL process, the electron beam transverse emittance and peak current must be appropriate. The beam must be bunched to achieve high peak currents (kiloamps) while preserving the transverse emittance
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