CERN Accelerating science

ATLAS Note
Report number	ATL-UPGRADE-PUB-2013-009
Title	Alpine Pixel Detector Layout
Author(s)	Delebecque, P (Annecy, LAPP) ; Elles, S (Annecy, LAPP) ; Geffroy, N (Annecy, LAPP) ; Massol, N (Annecy, LAPP) ; Rambure, T (Annecy, LAPP) ; Todorov, T (Annecy, LAPP)
Corporate Author(s)	The ATLAS collaboration
Publication	2013
Imprint	14 Feb 2013
Number of pages	mult.
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	A description of an optimized layout of pixel sensors based on a stave that combines both barrel and endcap module orientations. The mechanical stiffness of the structure is provided by carbon fiber shells spaced by carbon foam. The cooling of the modules is provided by two-phase $CO_{2}$ flowing in a thin titanium pipe glued inside the carbon fiber foam. The electrical services of all modules are provided by a single stave flex. This layout eliminates the need for separate barrel and endcap detector structures, and therefore the barrel services material in front of the endcap. The transition from barrel to endcap module orientation is optimized separately for each layer in order to minimize the active pixel area and the traversed material. The sparse module spacing in the endcap part of the stave allows for multiple fixation points, and for a stiff overall structure composed only of staves interconnected by stiff disks.
Scientific contact person	Todorov, T, ([email protected])
Copyright/License	Preprint: (License: CC-BY-4.0)