93 research outputs found
Sensor response and radiation damage effects for 3D pixels in the ATLAS IBL Detector
No full textPixel sensors in 3D technology equip the outer ends of the staves of the Insertable B Layer (IBL), the innermost layer of the ATLAS Pixel Detector, which was installed before the start of LHC Run 2 in 2015. 3D pixel sensors are expected to exhibit more tolerance to radiation damage and are the technology of choice for the innermost layer in the ATLAS tracker upgrade for the HL-LHC programme. While the LHC has delivered an integrated luminosity of ≃ 235 fb−1 since the start of Run 2, the 3D sensors have received a non-ionising energy deposition corresponding to a fluence of ≃ 8.5 × 1014 1 MeV neutron-equivalent cm−2 averaged over the sensor area. This paper presents results of measurements of the 3D pixel sensors’ response during Run 2 and the first two years of Run 3, with predictions of its evolution until the end of Run 3 in 2025. Data are compared with radiation damage simulations, based on detailed maps of the electric field in the Si substrate, at various fluence levels and bias voltage values. These results illustrate the potential of 3D technology for pixel applications in high-radiation environments
ATLAS event at 900 GeV - 6 May 2015 - Run 264034 Evt 11475271
No full textDisplay of a proton-proton collision event recorded by ATLAS on 6 May 2015, at 900 GeV collision energy. Tracks are reconstructed from hits in the inner tracking detector, including the new innermost pixel detector layer, the IBL. The IBL was turned on for the first time during collisions during this data-taking. The IBL is shown as the small ring in the left-hand azimuthal view, and the innermost layers in the right-hand longitudinal view
3D silicon sensor developed for the ATLAS IBL
No full text3D silicon sensors were developed for the ATLAS Insertable B-Layer, in the pixel region of the Inner Detector. They have also a possible application in medical imaging
Irradiation and beam tests qualification for ATLAS IBL Pixel Modules
No full textThe upgrade for the ATLAS detector will have different steps towards HL-LHC. The first upgrade for the Pixel Detector will consist in the construction of a new pixel layer which will be installed during the first shutdown of the LHC machine (foreseen for 2013-14). The new detector, called Insertable B-Layer (IBL), will be inserted between the existing Pixel Detector and a new (smaller radius) beam-pipe at a radius of 33 mm. The IBL will require the development of several new technologies to cope with the increase of the radiation damage and the pixel occupancy and also to improve the physics performance, which will be achieved by reduction of the pixel size and of the material budget. Two different promising silicon sensor technologies (Planar n-in-n and 3D) are currently under investigation for the Pixel Detector. An overview of the sensor technologies’ qualification with particular emphasis on irradiation and beam tests are presented
Performance Evaluation of the ATLAS IBL Calibration
No full textThe Insertable-B-Layer (IBL) has recently been commissioned at the ATLAS Experiment, adding 12 million channels to the existing Pixel Detector. The front-end chips (FE-I4) are connected to newly designed readout hardware situated in a VME crate. In order to take data under uniform conditions, one needs to periodically tune the detector in short breaks between data-taking sessions to accommodate for radiation damage and ageing effects. Tuning involves a variety of components, ranging from high-level steering and analysis software (PixLib) running on commodity hardware, to embedded components situated inside the VME crate that feature only a minimal or no operating system at all. Understanding the interactions between these components is key in debugging and optimizing the tuning procedures to become more efficient. We therefore implement an instrumentation framework aimed at all major components. It features a uniform interface to the user and is able to take instrumentation data with μs-precision. A central server application is used to gather the instrumentation data of a tuning session. It processes the data and saves it into a SQLite database for later analysis
Sensor response and radiation damage effects for 3D pixels in the ATLAS IBL Detector
No full textPixel sensors in 3D technology equip the outer ends of the staves of the Insertable B Layer (IBL), the innermost layer of the ATLAS Pixel Detector, which was installed before the start of LHC Run 2 in 2015. 3D pixel sensors are expected to exhibit more tolerance to radiation damage and are the technology of choice for the innermost layer in the ATLAS tracker upgrade for the HL-LHC programme. While the LHC has delivered an integrated luminosity of ≃ 235 fb-1 since the start of Run 2, the 3D sensors have received a non-ionising energy deposition corresponding to a fluence of ≃ 8.5 × 1014 1 MeV neutron-equivalent cm-2 averaged over the sensor area. This paper presents results of measurements of the 3D pixel sensors' response during Run 2 and the first two years of Run 3, with predictions of its evolution until the end of Run 3 in 2025. Data are compared with radiation damage simulations, based on detailed maps of the electric field in the Si substrate, at various fluence levels and bias voltage values. These results illustrate the potential of 3D technology for pixel applications in high-radiation environments
Operational Experience and Performance with the ATLAS Pixel detector at the Large Hadron Collider at CERN
No full textThe tracking performance of the ATLAS detector al LHC relies critically on its 4-layer Pixel Detector.The key status and performance metrics of the ATLAS Pixel Detector are summarised, and the operational experience and requirements to ensure optimum data quality and data taking efficiency will be described, with special emphasis to radiation damage experience. By the end of the proton-proton collision runs in 2018, the innermost layer IBL, consisting of planar and 3D pixel sensors, had received an integrated fluence of approximately Φ = 9 × 1014 1 MeV neq/cm2. The ATLAS collaboration is continually evaluating the impact of radiation on the Pixel Detector. A quantitative analysis of charge collection, dE/dX, occupancy reduction with integrated luminosity, under-depletion effects with IBL, effects of annealing will be presented and discussed, as well as the operational issues and mitigation techniques adopted during the LHC Run2 and the ones foreseen for Run3
IBL Efficiency and Single Point Resolution in Collision Events
No full textThe following plots show the IBL cluster efficiency and single point resolution measured on a sample of Z -> mu mu selected events. Results obtained for data are compared with ATLAS simulation predictions
Sensor response and radiation damage effects for 3D pixels in the ATLAS IBL Detector
No full textPixel sensors in 3D technology equip the outer ends of the staves of the Insertable B Layer (IBL), the innermost layer of the ATLAS Pixel Detector, which was installed before the start of LHC Run 2 in 2015. 3D pixel sensors are expected to exhibit more tolerance to radiation damage and are the technology of choice for the innermost layer in the ATLAS tracker upgrade for the HL-LHC programme. While the LHC has delivered an integrated luminosity of 235 fb since the start of Run 2, the 3D sensors have received a non-ionising energy deposition corresponding to a fluence of 1 MeV neutron-equivalent cm averaged over the sensor area. This paper presents results of measurements of the 3D pixel sensors' response during Run 2 and the first two years of Run 3, with predictions of its evolution until the end of Run 3 in 2025. Data are compared with radiation damage simulations, based on detailed maps of the electric field in the Si substrate, at various fluence levels and bias voltage values. These results illustrate the potential of 3D technology for pixel applications in high-radiation environments
- …
