  The Any Light Particle Search II (ALPS II) requires a sensitive detection of
1064 nm photons. Thus, a low dark count rate (DC) and a high detection
efficiency (DE) is needed. ALPS has set up a transition-edge sensor (TES)
detector system, namely the ALPS TES detector. It is found that thermal photons
from room temperature surfaces are the main contribution of dark counts for
1064 nm photon signals. Furthermore, the current setup of the ALPS TES detector
shows an improvement compared to using the ALPS I detector.
