B-spline parameterization of spatial response in a monolithic scintillation camera

Solovov, V.; Morozov, A.; Chepel, V.; Domingos, Valdemar F.; Martins, Ricardo

doi:10.1088/1748-0221/11/09/p09014

Cited by 5 publications

(6 citation statements)

References 27 publications

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“…In LZ, for the purpose of energy reconstruction, the S 2 is only calculated for the bottom array to avoid bias due to saturation of the PMTs, while the S2 signals from the top array are used to reconstruct the xy position. Knowing the xy position, the LRFs of the bottom array are parameterized as a weighted sum of tensor products of uniform basic cubic splines using the methods developed in [14].…”

Section: Jinst 18 C04007mentioning

confidence: 99%

Energy resolution of the LZ detector for high-energy electronic recoils

2023

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The LUX-ZEPLIN (LZ) detector is a dual-phase liquid xenon time projection chamber (TPC) installed at the Sanford Underground Research Facility (Lead, South Dakota) at a depth of 1478 meters. Although the main objective of LZ is the direct detection of dark matter, its low background environment allows for the search of other rare processes, such as the neutrinoless double beta decay of xenon isotopes 134Xe and 136Xe with the respective Q-values of 826 keV and 2458 keV. The sensitivity of the detector to these decays is directly determined by the energy resolution, which, in turn, is degraded by non-uniformities in detector response. In this work, we present a novel method to correct, in the data, the non-uniformity of the light collected by an array of photosensors in a scintillation detector. This method is based on the knowledge of the light response functions of individual photosensors. With these techniques, we report, at a very early phase of the detector operations, a state-of-the-art energy resolution (σ/μ) of (0.67 ± 0.01)% at 2614 keV for the fiducial volume of 5.6 tonnes of liquid xenon.

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Section: Jinst 18 C04007mentioning

confidence: 99%

Energy resolution of the LZ detector for high-energy electronic recoils

2023

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“…Reconstruction of the position and energy (defined here as the number of emitted photons) of a scintillation event is performed by the maximum likelihood (ML) method assuming Poisson distribution of the number of photo-electrons in each channel. The LRFs, parameterized with B-splines [20], are computed using an iterative method (see the next section) from a flood field irradiation dataset. The search for the position resulting in the best match between the experimental and the predicted distributions of the number of photo-electrons across the SiPM array is performed using the contracting grids algorithm implemented on GPU.…”

Section: Scintillation Event Reconstructionmentioning

confidence: 99%

SiPM-based neutron Anger camera with auto-calibration capabilities

Morozov¹,

Marcos²,

Margato³

et al. 2019

J. Inst.

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We present characterization results of a neutron Anger camera based on a lithium-6 loaded cerium activated silicate glass scintillator (33.3 x 33.3 x 1 mm 3 ) and an array of 64 silicon photomultipliers. Reconstruction of the scintillation events is performed with a statistical method, implemented on a graphics processing unit (GPU). We demonstrate that the light response model of the detector can be obtained from flood irradiation calibration data using an unsupervised iterative procedure. The useful field of view is 28 x 28 mm 2 . The spatial resolution measured at 2.5 Å neutron beam is better than 0.6 mm FWHM and the energy resolution at the neutron peak is 11%.

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“…Cubic splines are employed for parameterization of the LRFs. A detailed description of the custom library used for parameterization and available parameterization options can be found in [27].…”

Section: Package Overviewmentioning

confidence: 99%

“…An LRF describes the average signal of a photosensor as a function of the position of a point light source emitting isotropically a constant number of photons. The LRFs are parameterized in ANTS2 using B-splines [27]. The LRF module calculates these functions from datasets containing photosensor signals and the corresponding event positions.…”

Section: Lrf Modulementioning

confidence: 99%

“…The focus and specific strength of the ANTS2 package is in the iterative reconstruction of the detector response: all modules are designed to provide effective tools for finding an optimized reconstruction procedure for a given detector. A custom library for detector response parameterization based on B-splines [27] is implemented. It is capable of handling light response functions of photosensors depending on one, two or three spatial coordinates, which is sufficient for virtually any Anger camera type detector.…”

Section: Introductionmentioning

confidence: 99%

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ANTS2 package: simulation and experimental data processing for Anger camera type detectors

et al. 2016

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ANTS2 is a simulation and data processing package developed for position sensitive detectors with Anger camera type readout. The simulation module of ANTS2 is based on ROOT package from CERN, which is used to store the detector geometry and to perform 3D navigation. The module is capable of simulating particle sources, performing particle tracking, generating photons of primary and secondary scintillation, tracing optical photons and generating photosensor signals. The reconstruction module features several position reconstruction methods based on the statistical reconstruction algorithms (including GPU-based implementations), artificial neural networks and k-NN searches. The module can process simulated as well as imported experimental data containing photosensor signals. A custom library for B-spline parameterization of spatial response of photosensors is implemented which can be used to calculate and parameterize the spatial response of a detector. The package includes a graphical user interface with an extensive set of configuration, visualization and analysis tools. ANTS2 is being developed with the focus on the iterative (adaptive) reconstruction of the detector response using flood field irradiation data. The package is implemented in C++ programming language and it is a multiplatform, open source project.

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B-spline parameterization of spatial response in a monolithic scintillation camera

Cited by 5 publications

References 27 publications

Energy resolution of the LZ detector for high-energy electronic recoils

Energy resolution of the LZ detector for high-energy electronic recoils

SiPM-based neutron Anger camera with auto-calibration capabilities

ANTS2 package: simulation and experimental data processing for Anger camera type detectors

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