Prototyping of hybrids and modules for the forward silicon strip tracking detector for the ATLAS Phase-II upgrade

Abstract

For the High-Luminosity upgrade of the Large Hadron Collider an increased instantaneous luminosity of up to 7.5 ⋅ 1034 cm−2 s−1, leading to a total integrated luminosity of up to 3000 fb−1, is foreseen. The current silicon and transition radiation tracking detectors of the ATLAS experiment will be unable to cope with the increased track densities and radiation levels, and will need to be replaced. The new tracking detector will consist entirely of silicon pixel and strip detectors. In this paper, results on the development and tests of prototype components for the new silicon strip detector in the forward regions (end-caps) of the ATLAS detector are presented. Flex-printed readout boards with fast readout chips, referred to as hybrids, and silicon detector modules are investigated. The modules consist of a hybrid glued onto a silicon strip sensor. The channels on both are connected via wire-bonds for readout and powering. Measurements of important performance parameters and a comparison of two possible readout schemes are presented. In addition, the assembly procedure is described and recommendations for further prototyping are derived.

Prototyping of petalets for the Phase-II upgrade of the silicon strip tracking detector of the ATLAS experiment

“…The minimum input noise of a lower module is 650 ENC and for an upper one 550 ENC in both layouts. Comparing these values to results from single modules measured in test frames (lower modules about 650 ENC, upper modules about 520 ENC) [4], the noise values are slightly higher for petalets. The grounding was optimized for all petalets.…”

“…For both schemes a higher accuracy in module placement is expected making use of the sensor fidiucials. Modules are single entities in both concepts and it is suggested to reduce the width of the hybrids to match the sensor widths [4]. In summary, despite slightly additional material and the need of different bus tape flavours per side, after an ITk internal review, the ITk strips community agreed to use the split readout scheme for future prototyping of large structures, i.e.…”

“…A detailed R&D programme covering design, assembly and evaluation of these prototypes has been conducted. Two different readout architectures have been investigated to optimize the assembly and readout of full-size petals [3][4][5]. The main results of this study, the assembly and evaluation of fully assembled petalets are reviewed in this paper, including a comprehensive comparison between the two readout options investigated.…”

“…The power is routed on the left-hand side whereas data, clock, and timing, trigger and control (TTC) signals are routed on the right-hand side of the hybrids, modules, respectively. Taken from Ref [4]…”

A Starry Byte — proton beam measurements of single event upsets and other radiation effects in ABCStar ASIC Versions 0 and 1 for the ITk strip tracker

“…Each sensor strip is read out by a single channel of an ATLAS Binary Chip (ABC) ASIC. ABC ASICs were developed in several iterations (ABCN-25, ABC130, ABCStar [7]) to support several generations of module prototyping programme [6,8].…”