Speaker
Description
For the High-Luminosity Upgrade of the Large Hadron Collider, the ATLAS experiment will replace its current Inner Detector with the all-silicon Inner Tracker (ITk), which consists of pixel and strip systems. Relative to the current detector, the ITk features larger forward coverage, an order-of-magnitude increase in granularity, and improved radiation hardness. The ITk strip system's forward detectors or "end-caps" will consist of 7,000 silicon sensor modules. These modules are mounted onto large, double-sided support structures called "petals" which provide readout, control, power, and cooling to the underlying modules. Canada is responsible for assembling 1,500 modules into petals, corresponding to approximately 83 petals or 22% of the end-cap detectors.
This contribution presents the test results of a Canadian-made petal in an X-ray beam at the Diamond Light Source in Didcot, United Kingdom. It is the first ever beam test of a petal and the largest subassembly of the ITk tested in a beam to date. The beam test demonstrated the ability to reliably operate a petal for many hours. Additionally, the micron-level precision of the X-ray beam can resolve individual readout channels, enabling simultaneous measurements of mechanical properties on both sides of the petal. These mechanical properties inform the physics performance of the detector and include the relative placement of modules, which affects the hermiticity of the detector, and the relative rotation of modules, which affects the intrinsic resolution of the detector. The measured properties demonstrate excellent consistency with their specifications, verifying the quality of the petal assembly procedure. Altogether, this measurement serves as an example for future beam tests of large detector components.
| Keyword-1 | Hadron collider physics |
|---|---|
| Keyword-2 | Silicon detectors |
| Keyword-3 | Beam tests of particle detecto |