Production and Installation of the LUX-ZEPLIN Cathode High Voltage Delivery System

UX-ZEPLIN (LZ) is a 7-ton active volume dual phase xenon time projection chamber (TPC) that will perform several rare event searches starting later this year. The 1.456 meter drift length poses particular challenges for the experiment. The generation and maintenance of a uniform drift field of 300 Volts / cm is one aspect that becomes difficult at large length scales. High voltage must be delivered to the cathode without producing any additional light, spoiling the xenon’s purity, or exceeding the allowed radioactive background. To ensure that these effects will not diminish LZ’s sensitivity, a prototype of the cathode high voltage cable feedthrough was tested at Lawrence Berkeley National Lab under conditions mimicking those in LZ. The production feedthrough and connection was machined, assembled, and installed at Sanford Underground Research Facility this spring. In this talk I present the overall aspects of this component of the LZ experiment and the process of assuring its quality relating to the unique aspects required of it.