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BlackGEM (BG) is an array of telescopes, currently under development at theRadboud University Nijmegen and at NOVA. It targets the detection of theoptical counterparts of gravitational waves. The first 3 BG telescopes areplanned to be installed in 2018 at the La Silla observatory. A single prototypetelescope, named MeerLICHT, will already be commissioned early 2017 inSutherland to provide an optical complement for the MeerKAT radio array. The BGarray consists of, initially, a set of 3 robotic 65-cm wide-field telescopes.Each telescope is equipped with a single STA1600 CCD detector with 10.5k x10.5k 9-mum pixels that covers a 2.7 square degrees field of view. Thecryostats for housing these detectors are developed and built at the KU LeuvenUniversity. The operational model of BG requires long periods of reliableands-off operation. Therefore, we designed the cryostats for long vacuum holdtime and we make use of a closed-cycle cooling system, based on Polycold PCCJoule-Thomson coolers. A single programmable logic controller (PLC) controlsthe cryogenic systems of several BG telescopes simultaneously, resulting in ahighly reliable, cost-efficient and maintenance-friendly system. PLC-basedcryostat control offers some distinct advantages, especially for a roboticfacility. Apart of temperature monitoring and control, the PLC also monitorsthe vacuum quality, the power supply and the status of the PCC coolers(compressor power consumption and temperature, pressure in the gas lines,etc.). Furthermore, it provides an alarming system and safe and reproducibleprocedures for automatic cool down and warm up. The communication between PLCand higher-level software takes place via the OPC-UA protocol, offering asimple to implement, yet very powerful interface. Finally, a touch-paneldisplay on the PLC provides the operator with a user-friendly and robusttechnical interface.

PLC-controlled cryostats for the BlackGEM and MeerLICHT detectors