X-ray Source with Photon Energy 5 keV Pumped by Laser

Abstract

Investigation of a monochromatic point X-ray source of photon energy $5 keV has been carried out. The source was set up using a laser produced aluminium plasma as a cathode and a point-tip titanium anode. Optimum parameters of the diode were determined from experimental measurements of X-ray intensity dependence on laser pulse energy, applied accelerating voltage, and distance between target (cathode) and anode, using Nd:glass laser pulses (FWHM 30 ns) of 2 mJ to 4 J energy. Electron temperature characterization of the target plasma was also performed from the XUV emission spectrum (5 to 80Ð). Parameters of X-ray radiation in Ti K-shells are 1) spectral brightness of $ 10 20 photons/cm 2 -sec-sr-keV, 2) spatial size $ 300 microns, and 3) X-ray pulse duration less than 20 ns.

Monochromatic x-ray radiation from a vacuum diode with a laser-irradiated cathode

“…The flow of current in the diode was monitored by inserting a Rogowski coil and a 10 m Q resistance in the circuit. parameters (inter electrode distance, laser flux density, focal spot size, applied voltage) and diode structure have been optimized to increase the x-ray emission of the diode, according to [4].…”

“…High electron emissivity of laser plasma cathode, which makes it possible to work a lower voltages. Particularly at U= (3)(4). Uo (Uo is the threshold of excitation of characteristic radiation) the maximum of ratio of intensity characteristic radiation to intensity Bremsstrahlung radiation is achieved.…”

“…Although laser heated plasmas emit intense x-ray pulses, this emission occurs over a wide spectral range. On the other hand, vacuum diodes can be used to generate monochromatic x-ray radiation using laser produced plasma as the cathode [1][2][3][4]. In this paper, we present an experimental study ofK-shell (K and K) x-ray generation in a laser driven vacuum diode in which electrons from a laser produced aluminum ore titanium plasma are accelerated on to a point-tip titanium anode.…”