Abstract
A compact Inverse Compton Light Source (ICLS) design is presented, with flux and brilliance orders of magnitude beyond conventional laboratory-scale sources and other compact ICLS designs. This design 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 ps). The accelerator is composed of a superconducting radiofrequency (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 meters, 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 $1.4\times10^{14}$ ph/s, the flux into a 0.1% bandwidth of $2.1\times10^{11}$ ph/(s-0.1%BW), and the average brilliance of $2.2\times10^{15}$ ph/(s-mm$^2$-mrad$^2$-0.1%BW).
Highlights
Since their discovery in 1895, x-rays have been a powerful technique for determining the structure of condensed matter
The Compact Inverse Compton Light Source (ICLS) design presented here would improve on all other compact sources to date, producing an x-ray beam of quality which is closer than ever to being comparable to beams produced at large-scale facilities
This is made possible by using cw superconducting rf to accelerate the beam before it is focused to the interaction point
Summary
Since their discovery in 1895, x-rays have been a powerful technique for determining the structure of condensed matter. For the first 70 years of using x-rays, sources barely changed from the original bremsstrahlung tubes used in their discovery [1,2]. Large accelerator-based synchrotron facilities set the standard for the highest quality x-ray beams. At present, this standard has been largely surpassed in free electron lasers (FELs). Most high-brilliance sources exist at large facilities, especially third-generation synchrotrons [3]. Due to various concerns, among them cost, risk of transporting valuable items, and limited available runtime at large facilities, there has been an increasing demand for laboratory-scale sources. Additional desirable constraints are that the purchase and operating cost are not prohibitive for the smaller facilities and that the operation of a such a machine is possible by nonexperts
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