High-brilliance, high-flux compact inverse Compton light source

The Old Dominion University Compact Light Source (ODU CLS) design concept is presented---a compact Inverse Compton Light Source (ICLS) with flux and brilliance orders of magnitude beyond conventional laboratory-scale sources and greater than other compact ICLS designs. This concept utilizes the physics of inverse Compton scattering of an extremely low emittance electron beam by a laser pulse of rms length of approximately two-thirds of a picosecond ($2/3\text{ }\text{ }\mathrm{ps}$). The accelerator is composed of a superconducting radio frequency (SRF) reentrant gun followed by four double-spoke SRF cavities. After the linac are three quadrupole magnets to focus the electron beam to the interaction point (IP). The distance from cathode surface to IP is less than 6 m, with the cathode producing electron bunches with a bunch charge of 10 pC and a few picoseconds in length. The incident laser has 1 MW circulating power, a 1 micron wavelength, and a spot size of 3.2 microns at the IP. The repetition rate of this source is 100 MHz, in order to achieve a high flux despite the low bunch charge. The anticipated x-ray source parameters include an energy of 12 keV, with a total flux of $2.2\ifmmode\times\else\texttimes\fi{}{10}^{13}\text{ }\text{ }\mathrm{ph}/\mathrm{s}$, the flux into a 0.1% bandwidth of $3.3\ifmmode\times\else\texttimes\fi{}{10}^{10}\text{ }\text{ }\mathrm{ph}/(\mathrm{s}\text{ }0.1%\mathrm{BW})$, and the average brilliance of $3.4\ifmmode\times\else\texttimes\fi{}{10}^{14}\text{ }\text{ }\mathrm{ph}/(\mathrm{s}\text{ }{\mathrm{mm}}^{2}\text{ }{\mathrm{mrad}}^{2}\text{ }0.1%\mathrm{BW})$.