  In recent times, the sensitivity of low-mass direct dark matter searches has
been limited by unknown low energy backgrounds close to the energy threshold of
the experiments known as the low energy excess (LEE). The CRESST experiment
utilises advanced cryogenic detectors constructed with different types of
crystals equipped with Transition Edge Sensors (TESs) to measure signals of
nuclear recoils induced by the scattering of dark matter particles in the
detector. In CRESST, this low energy background manifests itself as a steeply
rising population of events below 200 eV. A novel detector design named
doubleTES using two identical TESs on the target crystal was studied to
investigate the hypothesis that the events are sensor-related. We present the
first results from two such modules, demonstrating their ability to
differentiate between events originating from the crystal's bulk and those
occurring in the sensor or in its close proximity.
