  The radiation emission from electrons wiggling in a laser wakefield
acceleration (LWFA) process, being initially considered as a parasitic effect
for the electron energy gain, can eventually serve as a novel X-ray source,
that could be used for diagnostic purposes. Although several schemes for
enhancing the X-ray emission in LWFA has been recently proposed and analyzed,
finding an efficient way to use and control these radiation emissions remains
an important problem. Based on analytical estimates and 3D particle-in-cell
simulations, we here propose and examine a new method utilizing two colliding
LWFA patterns with an angle in-between their propagation directions. Varying
the angle of collision, the distance of acceleration before the collision and
other parameters provide an unprecedented control over the emission parameters.
Moreover, we reveal here that for a collision angle of 5$^\circ$, the two
wakefields merge into a single LWFA cavity inducing strong and stable
collective oscillations between the two trapped electron bunches. This results
in an X-ray emission which is strongly peaked, both in the spatial and
frequency domain. The basic concept of the proposed scheme may pave a way for
using LWFA radiation sources in many important applications, such as
phase-contrast radiography.
