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The High Energy Stereoscopic System (H.E.S.S.) is an array of imagingatmospheric Cherenkov telescopes (IACTs) located in the Khomas Highland inNamibia. It consists of four 12-m telescopes (CT1-4), which started operationsin 2003, and a 28-m diameter one (CT5), which was brought online in 2012. It isthe only IACT system featuring telescopes of different sizes, which providessensitivity for gamma rays across a very wide energy range, from ~30 GeV up to~100 TeV. Since the camera electronics of CT1-4 are much older than the one ofCT5, an upgrade is being carried out; first deployment was in 2015, fulloperation is planned for 2016. The goals of this upgrade are threefold:reducing the dead time of the cameras, improving the overall performance of thearray and reducing the system failure rate related to aging. Upon completion,the upgrade will assure the continuous operation of H.E.S.S. at its fullsensitivity until and possibly beyond the advent of CTA. In the design of thenew components, several CTA concepts and technologies were used and are thusbeing evaluated in the field: The upgraded read-out electronics is based on theNECTAR readout chips; the new camera front- and back-end control subsystems arebased on an FPGA and an embedded ARM computer; the communication betweensubsystems is based on standard Ethernet technologies. These hardware solutionsoffer good performance, robustness and flexibility. The design of the newcameras is reported here.

A major electronics upgrade for the H.E.S.S. Cherenkov telescopes 1-4