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The Any Light Particle Search II (ALPS II) experiment is a Light-Shining-through-a-Wall experiment under construction at DESY, Hamburg. Its goal is to probe the existence of Axion Like Particles (ALPs), a possible candidate for dark matter. The expected small rate of reconverted photons requires a sensor capable of measuring low-energetic photons (1.165 eV) with high efficiency and a low dark count rate. A first science run in 2022 will be based on a heterodyne detection scheme. For a second run, a Transition Edge Sensor (TES) system is envisioned as a photon-counting detector. The TES reacts to the change in temperature produced by the absorption of a single photon by operating in the transition between the superconducting and normal conducting phases. Due to its high sensitivity, the TES is susceptible to the influence of electronic noise and background events. In this work, we perform analyses in time and frequency domain and compare these results with simulations to understand the detector's energy resolution. The setup of the TES is presented, along with the proposed design to measure its efficiency and linearity. [ABSTRACT FROM AUTHOR]