Abstract
Powering concepts, such as serial powering and DC-DC conversion, are in development for the silicon trackers at sLHC to achieve an efficient power distribution with a minimum volume of cables. This paper will describe the serial powering scheme developed for the upgraded ATLAS pixel detector, with focus on the scheme architecture and on the main components involved: the Shunt-LDO regulator and the protection scheme. Issues connected to system aspects will be discussed, and the advantages in terms of material reduction provided by the proposed serial powering scheme will be presented.
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