An extreme thermal cycling reliability test of ATLAS ITk Strips barrel modules
arxiv(2024)
Abstract
At the end of Run 3 of the Large Hadron Collider (LHC), the accelerator
complex will be upgraded to the High-Luminosity LHC (HL-LHC) in order to
increase the total amount of data provided to its experiments. To cope with the
increased rates of data, radiation, and pileup, the ATLAS detector will undergo
a substantial upgrade, including a replacement of the Inner Detector with a
future Inner Tracker, called the ITk. The ITk will be composed of pixel and
strip sub-detectors, where the strips portion will be composed of 17,888
silicon strip detector modules. During the HL-LHC running period, the ITk will
be cooled and warmed a number of times from about -35^∘C to room
temperature as part of the operational cycle, including warm-ups during yearly
shutdowns. To ensure ITk Strips modules are functional after these expected
temperature changes, and to ensure modules are mechanically robust, each module
must undergo ten thermal cycles and pass a set of electrical and mechanical
criteria before it is placed on a local support structure. This paper describes
the thermal cycling Quality Control (QC) procedure, and results from the barrel
pre-production phase (about 5
order to assess the headroom of the nominal QC procedure of 10 cycles and to
ensure modules don't begin failing soon after, four representative ITk Strips
barrel modules were thermally cycled 100 times - this study is also described.
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