Design and Construction of HV Cables and Splitter Boxes for the MilliQan Experiment

The MilliQan experiment seeks to further understanding of physics beyond the Standard Model via the detection of millicharged particles. These millicharged particles are thought to be attributable to dark particles, which come from a theory of dark matter and dark energy as a collection of dark particles and their interactions. The MilliQan experiment features two detectors: a bar detector and a slab detector. In total, 264 photmultiplier tubes (PMTs) used in the two detectors must be powered with high voltage (HV) cables. Splitter box design and construction was needed to split the 1 mA current emerging from 72 outputs of 6 CAEN HV source modules into 264 0.25 mA currents. HV cable construction was needed to connect the HV source modules to the splitter boxes and the PMTs. Successful development of the splitter boxes and HV cables will power the detectors needed to detect millicharged particles.