PT Journal AU Diez, Sea Bernabeu Verdú, J Civera, JV Garcia, C Garcia-Argos, C Lacasta, C Marco, R Marti-Garcia, S Santoyo, D Soldevila, U TI A double-sided, shield-less stave prototype for the ATLAS Upgrade strip tracker for the High Luminosity LHC SO Journal of Instrumentation JI J. Instrum. PY 2014 BP P03012 - 16pp VL 9 DI 10.1088/1748-0221/9/03/P03012 LA English DE Large detector-systems performance; Si microstrip and pad detectors; Particle tracking detectors; Performance of High Energy Physics Detectors AB A detailed description of the integration structures for the barrel region of the silicon strips tracker of the ATLAS Phase-II upgrade for the upgrade of the Large Hadron Collider, the so-called High Luminosity LHC (HL-LHC), is presented. This paper focuses on one of the latest demonstrator prototypes recently assembled, with numerous unique features. It consists of a shortened, shield-less, and double sided stave, with two candidate power distributions implemented. Thermal and electrical performances of the prototype are presented, as well as a description of the assembly procedures and tools. ER