Fabrication and performance of AC-coupled LGADs

Giacomini, G.; Chen, Wei; D’amen, G.; Tricoli, A.

doi:10.1088/1748-0221/14/09/p09004

Cited by 55 publications

(30 citation statements)

References 9 publications

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“…LGADs) [1,2] are a new generation of silicon devices optimized for high-precision 4D tracking and conceived for experiments at future colliders. They are n-in-p sensors based on the LGAD technology with two additional key features (Fig.…”

Section: Ac-coupled Low Gain Avalanche Diodes (Ac-mentioning

confidence: 99%

“…Fig. 17, plot on the left, shows how the temporal resolution of a single pad changes as a function of the delay parameter 𝛾, for three different geometries from the same wafer; the plot on the right shows how the optimized delay parameter depends linearly on the ratio (𝑚𝑒𝑡𝑎𝑙∕𝑝𝑖𝑡𝑐ℎ) 2 . This fact is an indication that the geometrical properties of a given design, and not just the 𝑛 + resistivity, play a role in the delay.…”

Section: Measurement Of the Timing Resolutionmentioning

confidence: 99%

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Resistive AC-Coupled Silicon Detectors: Principles of operation and first results from a combined analysis of beam test and laser data

Arcidiacono

Cartiglia

Costa

et al. 2021

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Ac-coupled Low Gain Avalanche Diodes (Ac-mentioning

confidence: 99%

Section: Measurement Of the Timing Resolutionmentioning

confidence: 99%

Resistive AC-Coupled Silicon Detectors: Principles of operation and first results from a combined analysis of beam test and laser data

Arcidiacono

Cartiglia

Costa

et al. 2021

Nuclear Instruments and Methods in Physics Research Section A:

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“…Two different designs based on the same AC-coupled concept but different read-out pad layouts will be discussed. Some AC-coupled prototypes were fabricated at BNL [13]. One of these devices, a strip-like AC-Fig.…”

Section: Ac-lgadmentioning

confidence: 99%

Low Gain Avalanche Detectors for 4-dimensional Tracking Applications in Severe Radiation Environments

Currás

2021

Proceedings of the 29th International Workshop on Vertex Detectors (VERTEX2020)

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For the High Luminosity upgrade of the CERN Large Hadron Collider (HL-LHC), the collider will reach a peak instantaneous luminosity of 5 × 10 34 cm −2 s −1 , with a total integrated luminosity of ∼ 3000 f b −1 after around 12 years of expected lifetime. The pile-up during the p + p + collisions is expected to reach values of ∼ 200 and the experiments are expected to be exposed to radiation levels up to 1.6 × 10 16 n eq cm −2 at the innermost layers of the detectors. Moreover, in future proposal colliders, like for example FCC-hh, the pile-up is expected to be a factor of five higher while the radiation levels will increase by a factor of ten with respect to the HL-LHC. Under this scenario, in the framework of ATLAS, CMS, RD50 and other sensor R&D projects, radiation tolerant silicon sensors for timing and tracking applications are being developed. Giving the expected radiation levels and the demanding spatial resolution plus timing capabilities required, one important line of research is focused on silicon sensors with intrinsic charge gain: Low Gain Avalanche Detectors (LGADs). This paper aims to give an overview of the current status of this technology. The most interesting approaches for future 4-dimensional tracking applications based on the LGAD technology will be presented here. In addition, the latest results on the performance after irradiation of standard LGADs will be reviewed too.

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“…The AC-LGAD sensor studied in this article was fabricated at BNL, using a class-100 silicon processing facility, following the process outlined in Ref. [12]. Figure 1 shows the cross-section of a segmented AC-LGAD sensor.…”

Section: The Ac-lgad Sensormentioning

confidence: 99%

Measurements of an AC-LGAD strip sensor with a 120 GeV proton beam

Apresyan¹,

Chen²,

D’amen³

et al. 2020

J. Inst.

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A : The development of detectors that provide high resolution in four dimensions has attracted widespread interest in the scientific community for several applications in high-energy physics, nuclear physics, medical imaging, mass spectroscopy as well as quantum information. In addition to high time resolution and thanks to the AC-coupling of the electrodes, LGAD silicon sensors can provide high resolution in the measurement of spatial coordinates of an incident minimum ionizing particle. Such AC-coupled LGADs, also known as AC-LGADs, are therefore considered as candidates for future detectors to provide 4-dimensional measurements in a single sensing device with 100% fill factor. This article presents the first characterization of an AC-LGAD sensor with a proton beam of 120 GeV momentum at Fermilab. The sensor consists of strips with 80 µm width, fabricated at Brookhaven National Laboratory. The signal properties, efficiency, spatial, and time resolution are presented. The experimental results show that the time resolution of such an AC-LGAD is compatible to standard LGADs with similar gain, and that AC-LGADs can be segmented with fine pitches as standard strip or pixel detectors.

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Fabrication and performance of AC-coupled LGADs

Cited by 55 publications

References 9 publications

Resistive AC-Coupled Silicon Detectors: Principles of operation and first results from a combined analysis of beam test and laser data

Resistive AC-Coupled Silicon Detectors: Principles of operation and first results from a combined analysis of beam test and laser data

Low Gain Avalanche Detectors for 4-dimensional Tracking Applications in Severe Radiation Environments

Measurements of an AC-LGAD strip sensor with a 120 GeV proton beam

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