Automation of LN2 filling of Clover detectors: a new control system in INGA at IUAC

The Indian National Gamma Array (INGA) facility at IUAC used for nuclear structure studies of nuclei populated at extreme conditions (i.e., high excitation energy and at large angular momentum) and can accommodate maximum 24 high purity Ge Clover detectors. The Ge detectors are required to operate at cryogenic temperatures for suppressing thermal noise and hence providing better energy resolution. Due to this, an automated system for periodic liquid nitrogen (LN2) refilling is an essential part of facility operation. In this paper we are describing a new control system implemented for automation of the process to maintain adequate LN2 level in the Clover detectors. This system is designed based on most recent industrial technologies using time tested architectures, while also supporting the latest Internet of Things (IoT) interface. The control system has been assembled and successfully tested locally as well as remotely in automatic/manual control modes for few detectors in which PT100 sensors has been mounted. Once all sensors at the position, the system can provide unattended and efficient automatic LN2 filling operation along with ruggedness, reliability and convenient operation