Abstract
We present the design of an upgraded switching power supply for the front-end electronics of the ATLAS hadron tile calorimeter (TileCAL) at the LHC. The new design features significant improvement in noise, improved fault detection, and improved reliability, while retaining the compact size, water-cooling, output control, and monitoring features. We discuss the steps taken to improve the design. We present the results from extensive radiation testing to qualify the design, including sensitivity to Single Event Upset. We also present our reliability analysis. Production of 2400 new bricks for the detector is currently in progress, and we present preliminary results from the production checkout.
Highlights
Discussion of Improvements to Design– Add/improve ground planes – Add/improve filtering – Careful attention to return currents
We found a fix to the SEU problem - Confirmed SEU energy dependence not part of specs
influence future radiation tolerance specs Paper coming at 2012 IEEE NSS
Summary
– Add/improve ground planes – Add/improve filtering – Careful attention to return currents. – Bricks would latch up spontaneously – Can persist for a long time. – New layout to get chips over cold plate – Add thermal foam (Gap Pad) to couple chips to cold plate
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