Abstract
In the high luminosity era of the Large Hadron Collider, the instantaneous luminosity is expected to reach unprecedented values, resulting in about 200 proton-proton interactions in a typical bunch crossing. To cope with the resultant increase in occupancy, bandwidth and radiation damage, the ATLAS Inner Detector will be replaced by an all-silicon system, the Inner Tracker (ITk). The ITk consists of a silicon pixel and a strip detector and exploits the concept of modularity. Prototyping and testing of various strip detector components has been carried out. This paper presents the developments and results obtained with reduced-size structures equivalent to those foreseen to be used in the forward region of the silicon strip detector. Referred to as petalets, these structures are built around a composite sandwich with embedded cooling pipes and electrical tapes for routing the signals and power. Detector modules built using electronic flex boards and silicon strip sensors are glued on both the front and back side surfaces of the carbon structure. Details are given on the assembly, testing and evaluation of several petalets. Measurement results of both mechanical and electrical quantities are shown. Moreover, an outlook is given for improved prototyping plans for large structures.
Highlights
The project aimed for the demonstration of the feasibility of the components and a selection of the readout scheme
Co-curing of the bus tapes and carbon fibre facesheets is expected to improve the planarity of the assembly
Systematic temperature cycling and high rate tests are foreseen
Summary
The layout and the individual components of petalets are described. Scheme deploys connections and routing of data, clock, and trigger, timing and control signals at the right-hand side of the module, while powering is routed on the left-hand side This scheme is in the following called split readout scheme. The second metal layer of the embedded pad sensors leads to increased noise values depending on the length and geometry of the second metal layer traces [11, 12] These effect has to be taken into account when comparing the performance of petalets with modules built either from standard sensors or from embedded ones. Both readout schemes require different hybrid layouts. For the common readout scheme, individual hybrids are glued on the upper left and upper right sensor, resulting in total in three modules per petalet side. The test results show a good performance and low average input noise values of 380±20 ENC for hybrids and 520-750 ENC for modules depending on the sensor quality
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