A Burn-in test station for the ATLAS Tile-calorimeter low-voltage power supply transformer-coupled buck converters.

The start of the operation of the High Luminosity LHC (HL-LHC) is planned for the year 2029. The associated increase in luminosity provides an opportunity for further scientific discoveries as well as many technical challenges. The HL-LHC environment has necessitated the Phase-II upgrade of the ATLAS hadronic Tile-Calorimeter which will ensure its peak performance in the coming decades. The upgrade will take place during the long shutdown from December 2025 up until the beginning of 2029. It will encompass the replacement of both on- and off-detector electronics, the implementation of new on-detector mechanics as well as the replacement of Photo-multiplier tubes located in the most exposed regions of the detector. The on-detector electronics of the Tilecal are powered by 256 Low-Voltage Power Supplies (LVPS) which themselves contain eight transformer-coupled buck converters known as Bricks. These Bricks function to step-down bulk 200 V,DC power received from off-detector to the 10 V DC required. A Brick failure will result in the front-end electronics to which it supplies power being offline for a commensurate time. Therefore, the reliability of the LVPS Bricks is of the utmost importance as access to them is limited to approximately once per year due to them being located within the inner barrel of ATLAS detector. To ensure the reliable operation of 2048 Bricks once on-detector an extensive quality control procedure is to be implemented which includes Burn-in testing. Burn-in testing is a form of accelerated aging of electronic components which functions to improve the reliability of the Bricks once on-detector. The Burn-in procedure subjects the Bricks to sub-optimal operating conditions which function to stimulate failure mechanisms within the Bricks. This results in components that would fail prematurely within TileCal failing within the Burn-in apparatus, known as a Burn-in station, thereby allowing for their replacement which subsequently improves the reliability of the Brick population. The Burn-in station is of a fully custom design in both its hardware and software due to the unique nature of its application. The development of the Burn-in station as well as the Burn-in procedure that it employs will be explored in detail with the poster culminating in preliminary Burn-in results of the latest LVPS prototypes produced