Speaker
Description
We present a novel detector concept using dielectrically-coupled photo sensors.
Our goal is to combine digital sensors with both power over fibre (PoF) and signal over fibre (SoF) to enable readout within electric fields (e-fields) at cryogenic temperatures. Motivated by maximising sensitivity of large-volume time projection chambers (TPCs). Timing resolution is limited by the optical path (Rayleigh scattering) and wavelength shifting. To mitigate these limitations, we need ultraviolet-sensitive sensors inside the active volume. Recent advancements in power over fibre have enabled instrumentation within e-fields. However, its efficiency limits channel density. We aim to reduce heating with pulsed power charging a capacitor integral to the sensor. To avoid issues associated with analog signal transmission and processing we require intrinsically digital sensors.
We define a digital photo sensor unit (DPSU) as a combination of a power over fibre receiver, an array of digital silicon photomultipliers, a signal over fibre receiver and transmitter, and associated electronics. Instead of augmenting existing TPCs with DPSUs, design a TPC around them. Consider a combination of IceCube and a TPC: IceCube has strings of photomultipliers embedded within a very large ice target mass. This can be applied to TPCs by extending strings of DPSUs between anode and cathode at separations below the Rayleigh scattering length, 0.9 m for argon, the DPSUs would have access to prompt local light, providing a TPC with unprecedented timing. Given sufficient sensor density, only timing information is needed.
Fast timing helps with energy resolution by improving the tagging of secondary, non-obviously-spatially-correlated, activity (e.g. neutrons), and identifying directionality (interaction vertex). It also enables particle identification through timing. The lack of waveform analysis for light data would simplify the DAQ and dramatically reduce computing requirements for large experiments.
We will present a development path for the components needed for such a detector and the status of our R&D.
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