Engineering for the ATLAS SemiConductor Tracker (SCT) End-cap

Self Cite

Inner Detector provides charged particle tracking in the centre of the ATLAS experiment at the Large Hadron Collider (LHC). The Inner Detector consists of three subdetectors: the Pixel Detector, the Semiconductor Tracker (SCT), and the Transition Radiation Tracker (TRT). This paper summarizes the tests that were carried out at the final stage of SCT+TRT integration prior to their installation in ATLAS. The combined operation and performance of the SCT and TRT barrel and endcap detectors was investigated through a series of noise tests, and by recording the tracks of cosmic rays. This was a crucial test of hardware and software of the combined tracker detector systems. The results of noise and cross-talk tests on the SCT and TRT in their final assembled configuration, using final readout and supply hardware and software, are reported. The reconstruction and analysis of the recorded cosmic tracks allowed testing of the offline analysis chain and verification of basic tracker performance parameters, such as efficiency and spatial resolution, in combined operation before installation.

Section: Results From Module Calibrationmentioning

confidence: 99%

Combined performance tests before installation of the ATLAS Semiconductor and Transition Radiation Tracking Detectors

Abat¹,

Abdesselam²,

Addy³

et al. 2008

Self Cite

“…Table 2 shows the values of the average measured noise for the barrel modules and the different types of endcap modules (outer, middle and inner). References [1][2][3][4][5]25] report noise figures for single module tests, module tests on single barrel layer or single endcap disk, module tests with the full barrel or endcap and finally module tests in ATLAS. Noise increase after installation is not significant; variations are…”

Section: Discussionmentioning

confidence: 99%

“…Barrel layers consist of one single module type, arranged in rows [2]. The endcap disks consist of modules arranged in rings [3]. One disk can have up to three rings, and the endcap modules are of three types: inner, middle (or short middles) and outer, corresponding to the different rings (figure 2).…”

Section: The Atlas Sctmentioning

confidence: 99%

“…The endcaps have the Radial Cable Tray (RCT) structure [3], to which the cooling loops are connected. In addition, a copper-grounded foil was added for each endcap disk and soldered to the cooling pipes.…”

Section: Cooling Pipesmentioning

confidence: 99%

“…In addition, the electrical shield had to be as continuous as possible; gaps and seams were minimised. References [2,3] explain in detail the design of the thermal enclosures.…”

Section: Faraday Cagementioning

confidence: 99%

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The ATLAS SCT grounding and shielding concept and implementation

Bates¹,

Bell²,

Bernabéu³

et al. 2012

Self Cite

This paper describes the design and implementation of the grounding and shielding system for the ATLAS SemiConductor Tracker (SCT). The mitigation of electromagnetic interference and noise pickup through power lines is the critical design goal as they have the potential to jeopardize the electrical performance. We accomplish this by adhering to the ATLAS grounding rules, by avoiding ground loops and isolating the different subdetectors. Noise sources are identified and design rules to protect the SCT against them are described. A rigorous implementation of the design was crucial to achieve the required performance. This paper highlights the location, JINST 7 P03005connection and assembly of the different components that affect the grounding and shielding system: cables, filters, cooling pipes, shielding enclosure, power supplies and others. Special care is taken with the electrical properties of materials and joints. The monitoring of the grounding system during the installation period is also discussed. Finally, after connecting more than four thousand SCT modules to all of their services, electrical, mechanical and thermal within the wider ATLAS experimental environment, dedicated tests show that noise pickup is minimised.

Thermal management and mechanical structures for silicon detector systems

Viehhauser

2015

Due to the size of current silicon tracking systems system aspects have become a major design driver. This article discusses requirements for the engineering of the mechanical structures and thermal management of such systems and reviews solutions developed to satisfy them. Modern materials and fabrication techniques have been instrumental in constructing these devices and will be discussed here. Finally, this paper will describe current and potential future developments in the engineering of silicon tracking systems which will shape the silicon tracking systems of the future. KEYWORDS: Overall mechanics design (support structures and materials, vibration analysis etc); Detector design and construction technologies and materials; Detector cooling and thermostabilization; Particle tracking detectors (Solid-state detectors)