ORCID Profile
0000-0003-1333-6876
Current Organisations
Università degli Studi di Pavia
,
Università degli Studi di Milano
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Publisher: IEEE
Date: 05-2017
Publisher: IEEE
Date: 12-2012
Publisher: Elsevier BV
Date: 08-2013
Publisher: IEEE
Date: 05-2010
Publisher: IOP Publishing
Date: 24-01-2013
Publisher: IOP Publishing
Date: 18-02-2016
Publisher: IEEE
Date: 12-2014
Publisher: IOP Publishing
Date: 13-04-2017
Publisher: IOP Publishing
Date: 28-06-2023
Abstract: Objective . Microbeam radiation therapy (MRT) is an alternative emerging radiotherapy treatment modality which has demonstrated effective radioresistant tumour control while sparing surrounding healthy tissue in preclinical trials. This apparent selectivity is achieved through MRT combining ultra-high dose rates with micron-scale spatial fractionation of the delivered x-ray treatment field. Quality assurance dosimetry for MRT must therefore overcome a significant challenge, as detectors require both a high dynamic range and a high spatial resolution to perform accurately. Approach . In this work, a series of radiation hard a-Si:H diodes, with different thicknesses and carrier selective contact configurations, have been characterised for x-ray dosimetry and real-time beam monitoring applications in extremely high flux beamlines utilised for MRT at the Australian Synchrotron. Results . These devices displayed superior radiation hardness under constant high dose-rate irradiations on the order of 6000 Gy s −1 , with a variation in response of 10% over a delivered dose range of approximately 600 kGy. Dose linearity of each detector to x-rays with a peak energy of 117 keV is reported, with sensitivities ranging from (2.74 ± 0.02) nC/Gy to (4.96 ± 0.02) nC/Gy. For detectors with 0.8 μ m thick active a-Si:H layer, their operation in an edge-on orientation allows for the reconstruction of micron-size beam profiles (microbeams). The microbeams, with a nominal full-width-half-max of 50 μ m and a peak-to-peak separation of 400 μ m, were reconstructed with extreme accuracy. The full-width-half-max was observed as 55 ± 1 μ m. Evaluation of the peak-to-valley dose ratio and dose-rate dependence of the devices, as well as an x-ray induced charge (XBIC) map of a single pixel is also reported. Significance . These devices based on novel a-Si:H technology possess a unique combination of accurate dosimetric performance and radiation resistance, making them an ideal candidate for x-ray dosimetry in high dose-rate environments such as FLASH and MRT.
Publisher: IEEE
Date: 06-2011
Publisher: Elsevier BV
Date: 08-2019
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2012
Publisher: IEEE
Date: 05-2014
Publisher: IOP Publishing
Date: 15-12-2010
Publisher: IEEE
Date: 10-2011
Publisher: IEEE
Date: 10-2019
Publisher: IEEE
Date: 05-2016
Publisher: IEEE
Date: 10-2013
Publisher: IEEE
Date: 2018
Publisher: IOP Publishing
Date: 07-2021
DOI: 10.1088/1748-0221/16/07/P07006
Abstract: The ATLAS Fast TracKer (FTK) was designed to provide full tracking for the ATLAS high-level trigger by using pattern recognition based on Associative Memory (AM) chips and fitting in high-speed field programmable gate arrays. The tracks found by the FTK are based on inputs from all modules of the pixel and silicon microstrip trackers. The as-built FTK system and components are described, as is the online software used to control them while running in the ATLAS data acquisition system. Also described is the simulation of the FTK hardware and the optimization of the AM pattern banks. An optimization for long-lived particles with large impact parameter values is included. A test of the FTK system with the data playback facility that allowed the FTK to be commissioned during the shutdown between Run 2 and Run 3 of the LHC is reported. The resulting tracks from part of the FTK system covering a limited η–ϕ region of the detector are compared with the output from the FTK simulation. It is shown that FTK performance is in good agreement with the simulation.
Publisher: IEEE
Date: 05-2014
Publisher: IOP Publishing
Date: 10-11-2014
Publisher: IOP Publishing
Date: 10-10-2012
Publisher: IOP Publishing
Date: 27-03-2014
Publisher: IEEE
Date: 12-2015
Publisher: IEEE
Date: 12-2015
Publisher: IEEE
Date: 05-2017
No related grants have been discovered for Valentino Liberali.