AVS 53rd International Symposium
    Ultra-Bright Light Sources Topical Conference Wednesday Sessions
       Session UB-WeA

Invited Paper UB-WeA3
The Next Generation Light Source at Jefferson Lab

Wednesday, November 15, 2006, 2:40 pm, Room 2001

Session: Ultra-Bright Light Sources Topical Conference
Presenter: G.P. Williams, Jefferson Lab
Authors: G.P. Williams, Jefferson Lab
FEL Team, Jefferson Lab
Correspondent: Click to Email
Jefferson Lab operates a fourth generation accelerator-based light source. The facility is based on an Energy Recovered Linac (ERL),@footnote 1@ which has a significant advantage in brightness over a conventional electron storage ring (synchrotron) source. Both terms contributing to the brightness are enhanced. The power is enhanced by multiparticle coherent effects,@footnote 2@ while the source size is smaller because the horizontal emittance is approximately equal to the vertical emittance (round beams). This type of source has additional advantages in that the bunch lengths are in the 100's of femtosecond range, allowing ultrafast phenomena to be studied in the time domain. The JLab facility incorporates 3 sources: (1). A 10 kW av. power 1-14 micron tunable Infrared Free Electron Laser (IRFEL) with energies of 120 microJoules per pulse: (2). A 1 kW av. power 250 nm to 1 micron UVFEL with up to 25 microJoules per pulse: and (3). A 0.1 to 5 THz source@footnote 3@ with 1 microJoule per pulse. All 3 sources can operate at pulse repetition frequencies up to 75 MHz and pulse lengths in the range 250 - 2000 femtoseconds. We will present details of the source, and will make frequent comparisons with storage ring sources and x-ray FELs. We will also discuss and show examples of key scientific applications of this unique light source. These cover the fields of medicine, biology, physics, chemistry and materials science with experiments ranging from dynamics to disease treatment. The applications also include studies of non-linear effects and 2 photon pump-probe dynamics. In addition to this source, Jefferson Lab operates a 6GeV accelerator, which is capable of producing sub-picosecond x-rays with a brightness comparable to dipole radiation at a storage ring. This will also be presented. @FootnoteText@@footnote 1@G.R. Neil et al, Phys. Rev. Let. 84, 662 (2000). @footnote 2@C. J. Hirschmugl, M. Sagurton and G. P. Williams, Physical Review A44, 1316, (1991). @footnote 3@G.L. Carr, et al, Nature 420 153 (2002).