• K. Jacobs, J. Bisognano, M. Bissen, R.A. Bosch, M.A. Green, H. Höchst, K.J. Kleman, R.A. Legg, R. Reininger, R. Wehlitz
  UW-Madison/SRC, Madison, Wisconsin
• W. Graves, F.X. Kärtner, D.E. Moncton
  MIT, Cambridge, Massachusetts

Funding: Work supported by the University of Wisconsin - Madison. SRC is supported by the U.S. National Science Foundation under Award No. DMR-0537588.

The University of Wisconsin-Madison/Synchrotron Radiation Center and MIT are developing a design for a seeded VUV/soft X-ray Free Electron Laser serving multiple simultaneous users. The present design uses an L-band CW superconducting 2.2 GeV electron linac to deliver 200 pC bunches to multiple FELs operating at repetition rates from kHz to MHz. The FEL output will be fully coherent both longitudinally and transversely, with tunable pulse energy, cover the 5-900 eV photon range, and have variable polarization. We have proposed a program of R&D to address the most critical aspects of the project. The five components of the R&D program are:

1. Prototyping of a CW superconducting RF photoinjector operating in the self-inflating bunch mode.
2. Development of conventional laser systems for MHz seeding of the FEL, and femtosecond timing and synchronization.
3. Address thermal distortion and surface contamination issues on the photon optics.
4. Investigate advanced undulator concepts to help reduce facility cost and/or extend performance.
5. Perform detailed modeling of all aspects of the FEL, as part of production of a Conceptual Design Report for the FEL facility.

Slides