  An X-ray detector based on the combination of an integrated Micromegas stage
with a pixel chip has been built in order to be installed at the CERN Axion
Solar Telescope. Due to its high granularity and spatial resolution this
detector allows for a topological background suppression along with a detection
threshold below $1\,\text{keV}$. Tests at the CAST Detector Lab show the
detector's ability to detect X-ray photons down to an energy as low as
$277\,\text{eV}$. The first background data taken after the installation at the
CAST experiment underline the detector's performance with an average background
rate of $5\times10^{-5}\,/\text{keV}/\text{cm}^2/\text{s}$ between 2 and
$10\,\text{keV}$ when using a lead shielding.
