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SPEAR is the synchrotron storage ring used at SLAC to supply energetic electrons to the linear accelerator. Originally, the parasitic radiation that came from accelerated electrons was considered a nuisance until the potential for high energy x-ray experiments was realized. Since the accelerated electrons move at relativistic velocities, a highly directional and polarized beam of x-rays is emitted in the plane of the synchrotron. Experimenters recognized that these x-rays also spanned a broad spectrum of energies allowing for precise energy tuning using monochromators. These desirable traits lead to the development of beamlines where x-rays are used for numerous experiments that are not possible with conventional x-ray tubes. Shown below is a schematic of a typical synchrotron facility. Synchrotron radiation is used in our experiment as it provide a higher photon flux than conventional x-ray sources, and since the radiation is highly tunable. This has allowed us to achieve extremely low detection limits that are unmatched by conventional TXRF setups. |
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