  We report the LWFA driven X-ray sources development at ELI beamlines. ELI
Gammatron beamline provides X-ray pulses of energies from 1-100 keV in betatron
scheme, and up to a MeV in Compton scheme. A state-of-the-art Ti:Sa
diode-pumped HAPLS laser (10-30 J, 30 fs @10 Hz) is used as a driving laser for
these X-ray sources. These sources are characterized with a low divergence (<
10 mrad), small source size (few {\mu}m), short pulse duration (a few fs) and
photon flux up to1010 photons per pulse. In addition, a separate Betatron X-ray
source is being developed in the ELI Plasma Physics Platform (P3)that will
serve as an active diagnostics of various plasma physics experiments. P3 is
dedicated to laboratory astrophysics, HED physics, multi-beam experiments, warm
dense matter and fundamental research. Besides the presentation of the two
X-ray sources, we will also introduce a novel optical probing method with
increased interferometric sensitivity for characterization of low-density gas
jets. The sensitivity is achieved together with using a novel optical
configuration employing multiple passes of the probe beam through the object
and relay-imaging of the object between the individual passes, and a short
probing beam (405 nm).
