Compact x-ray source based on burst-mode inverse Compton scattering at 100 kHz

Abstract

A design for a compact x-ray light source (CXLS) with flux and brilliance orders of magnitude beyond existing laboratory scale sources is presented. The source is based on inverse Compton scattering of a high brightness electron bunch on a picosecond laser pulse. The accelerator is a novel high-efficiency standingwave linac and rf photoinjector powered by a single ultrastable rf transmitter at X-band rf frequency. The high efficiency permits operation at repetition rates up to 1 kHz, which is further boosted to 100 kHz by operating with trains of 100 bunches of 100 pC charge, each separated by 5 ns. The entire accelerator is approximately 1 meter long and produces hard x rays tunable over a wide range of photon energies. The colliding laser is a Yb∶YAG solid-state amplifier producing 1030 nm, 100 mJ pulses at the same 1 kHz repetition rate as the accelerator. The laser pulse is frequency-doubled and stored for many passes in a ringdown cavity to match the linac pulse structure. At a photon energy of 12.4 keV, the predicted x-ray flux is 5 × 10 11 photons=second in a 5% bandwidth and the brilliance is 2 × 10 12 photons=ðsec mm 2 mrad 2 0.1%Þ in pulses with rms pulse length of 490 fs. The nominal electron beam parameters are 18 MeV kinetic energy, 10 microamp average current, 0.5 microsecond macropulse length, resulting in average electron beam power of 180 W. Optimization of the x-ray output is presented along with design of the accelerator, laser, and x-ray optic components that are specific to the particular characteristics of the Compton scattered x-ray pulses.

Hidden library: visualizing fragments of medieval manuscripts in early-modern bookbindings with mobile macro-XRF scanner

“…For systematic scanning of bookbindings, ample availability of synchrotron-order X-ray intensity is required. Several 'table-top' initiatives have been proposed, of which a set-up based on inverse Compton scattering between a relativistic electron and a laser pulse now seems to be technically feasible [19]. Provided sufficient funding will become available, the intensity would approach that of a bending magnet synchrotron beam and surpass it in the high-energy range relevant for elemental analysis.…”

Advances in High-Power, Ultrashort Pulse DPSSL Technologies at HiLASE

“…Near-IR thin-disk lasers also proved their ability to generate high average power short pulses, which are suitable for laser produced plasma-based (LPP) [20], free electron laser-based (FEL) [21,22], or inverse Compton scattering-based (ICS) [23] extreme UV radiation sources. It helps, for example, to construct new stations for semiconductor lithography at 13.5 nm or 6.7 nm and to support evolution in electronics.…”

Aberration corrected emittance exchange

“…The normalized transverse emittance in the y-dimension is ϵ y ¼ 10 nm-rad. Simulations to produce these beam parameters are described in [19], and the accelerator equipment is described in [20]. The electron beam properties at the input of the EEX line are summarized in Table V Table VI.…”