Second generation prototype silicon photomultiplier focal plane imaging detector module tests in the MAGIC telescopes

To date, Imaging Atmospheric Cherenkov Telescopes (IACTs) have primarily been realized using photomultiplier tubes (PMTs) as light detectors. Recently, such telescopes of small size (∼4m) have been built using silicon photomultiplier (SiPM) sensors in their imaging cameras. This work describes a design approach for SiPM based focal plane experimental instrumentation for operation alongside the PMT based camera of a large IACT. The initial information gathered during design and operation of a first prototype single module installed alongside the PMT camera is summarized. This experience has been used to design two new alternative modules currently being implemented.