C. E. Jessiman
A5012658874- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
- Atomic and Subatomic Physics Research
- CCD and CMOS Imaging Sensors
- Advancements in Semiconductor Devices and Circuit Design
- Radiation Effects in Electronics
- Quantum, superfluid, helium dynamics
- Electrostatic Discharge in Electronics
- Advanced Data Storage Technologies
- Semiconductor materials and devices
- Silicon and Solar Cell Technologies
- Nuclear physics research studies
- Astronomical Observations and Instrumentation
- Icing and De-icing Technologies
- GaN-based semiconductor devices and materials
Carleton University
2018-2025
Government of Catalonia
2024
A. Alikhanyan National Laboratory
2024
University of Toronto
2024
Atlas Scientific (United States)
2024
The University of Adelaide
2022-2023
University of Geneva
2023
A search for neutrinoless double-beta decay ($0\nu\beta\beta$) in $^{136}$Xe is performed with the full EXO-200 dataset using a deep neural network to discriminate between $0\nu\beta\beta$ and background events. Relative previous analyses, signal detection efficiency has been raised from 80.8% 96.4$\pm$3.0% energy resolution of detector at Q-value improved $\sigma/E=1.23\%$ $1.15\pm0.02\%$ upgraded detector. Accounting new data, median 90% confidence level half-life sensitivity this analysis...
Abstract The ATLAS experiment is constructing new all-silicon inner tracking system for HL-LHC. strip detectors cover the radial extent of 40 to 100 cm. A approach adopted use p-type silicon material, making readout in n + -strips, so-called -in-p sensors. This allows enhanced radiation tolerance against an order magnitude higher particle fluence compared LHC. To cope with varying hit rates and occupancies as a function distance, there are two barrel sensor types, short strips (SS) 2 long...
Future tonne-scale liquefied noble gas detectors depend on efficient light detection in the VUV range. In past years Silicon Photomultipliers (SiPMs) have emerged as a valid alternative to standard photomultiplier tubes or large area avalanche photodiodes. The next generation double beta decay experiment, nEXO, with 5 tonne liquid xenon time projection chamber, will use SiPMs for detecting $178\,\text{nm}$ scintillation light, order achieve an energy resolution of $\sigma / Q_{\beta\beta} =...
Liquid xenon (LXe) is employed in a number of current and future detectors for rare event searches. We use the EXO-200 experimental data to measure absolute scintillation ionization yields generated by $\ensuremath{\gamma}$ interactions from $^{228}\mathrm{Th}$ (2615 keV), $^{226}\mathrm{Ra}$ (1764 $^{60}\mathrm{Co}$ (1332 keV 1173 keV) calibration sources, over range electric fields. The $W$ value that defines recombination-independent energy scale measured be...
Abstract Construction of the new all-silicon Inner Tracker (ITk), developed by ATLAS collaboration to be able track charged particles produced at High-Luminosity LHC, started in 2020 and is expected continue till 2028. The ITk detector will include 18,000 highly segmented radiation hard n+-in-p silicon strip sensors (ATLAS18), which are being manufactured Hamamatsu Photonics. Mechanical electrical characteristics measured upon their delivery several institutes participating a complex Quality...
We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using EXO-200 detector. report an average background rate $6.8\ifmmode\times\else\texttimes\fi{}{10}^{4}\text{ }\text{ }\mathrm{cts}\text{ }{\mathrm{kg}}^{\ensuremath{-}1}\text{ }{\mathrm{yr}}^{\ensuremath{-}1}\text{ }{\mathrm{keV}}^{\ensuremath{-}1}$ above 4 MeV and find no statistically significant excess over our projection. Using total $^{136}\mathrm{Xe}$ exposure 234.1 kg yr,...
The new all-silicon Inner Tracker (ITk) is being constructed by the ATLAS collaboration to track charged particles produced at High-Luminosity LHC. outer portion of ITk detector will include nearly 18,000 highly segmented and radiation hard silicon strip sensors (ATLAS18 design). Throughout production 22,000 sensors, are subjected a comprehensive suite mechanical electrical tests as part Quality Control (QC) program. In large fraction batches delivered date, high surface electrostatic charge...
The ATLAS experiment will replace its existing Inner Detector with the new all-silicon Tracker (ITk) to cope operating conditions of forthcoming high-luminosity phase LHC (HL-LHC). outer regions ITk be instrumented ∼18000 ATLAS18 strip sensors fabricated by Hamamatsu Photonics K.K. (HPK). With launch full-scale sensor production in 2021, community has undertaken quality control (QC) testing these ensure compliance mechanical and electrical specifications agreed HPK. is conducted at seven QC...
As a part of ongoing studies in parallel to ITk Strip Sensor Production quality control (QC) and assurance (QA), diodes fabricated as test structures were measured using Deep-Level Transient Spectroscopy (DLTS). This was done understand an anomalously large leakage current observed main sensors, improve the precision sensor simulations well compile more complete model radiation damage Sensors. Utilising DLTS spectra with varying parameters, trap energy levels cross-sections associated...
A search for Majoron-emitting modes of the neutrinoless double-beta decay $^{136}$Xe is performed with full EXO-200 dataset. This dataset consists a total exposure 234.1 kg$\cdot$yr, and includes data detector upgrades that have improved energy threshold relative to previous searches. lower limit T$_{1/2}^{\rm{^{136}Xe}}>$4.3$\cdot$10$^{24}$ yr at 90\% C.L. on half-life spectral index $n=1$ Majoron was obtained, factor 3.6 more stringent than from EXO-200, corresponding constraint...
The EXO-200 experiment searched for neutrinoless double-beta decay of $^{136}$Xe with a single-phase liquid xenon detector. It used an active mass 110 kg 80.6%-enriched in ultra-low background time projection chamber ionization and scintillation detection readout. This paper describes the design performance various support systems necessary detector operation, including cryogenics, handling, controls. Novel features system were driven by need to protect thin-walled containing xenon, achieve...
Abstract The high-luminosity upgrade of the Large Hadron Collider, scheduled to become operational in 2029, requires replacement ATLAS Inner Detector with a new all-silicon Tracker. Radiation hard n + -in-p micro-strip silicon sensors were developed by Tracker strip collaboration and are produced Hamamatsu Photonics K.K. Production total amount 22000 has started 2020 will continue until 2025. sensor responsibility monitor quality fabricated devices performing detailed measurements individual...
The breakdown voltage of silicon sensors is known to be affected by the ambient humidity. To understand sensor's humidity sensitivity, Synopsys TCAD was used simulate n-in-p for different effective relative humidities. Photon emission hot electrons imaged with a microscope locate in edge-region sensor. Top-Transient Current Technique measure charge transport near surface region Using measurements and simulations, evolution electric field carrier densities towards periphery p-bulk are investigated.
Abstract During the prototyping phase of new ATLAS Inner-Tracker (ITk) strip sensors, a degradation device breakdown voltage at high humidity was observed. Although temporary, showing fast recovery in dry conditions, study influence on sensor performance critical to establish counter-measures and handling protocols during production testing order ensure proper upgraded detector. The work presented here has objective for first time deterioration presence ambient ITk production-layout sensors...
Generative Adversarial Networks trained on samples of simulated or actual events have been proposed as a way generating large datasets at reduced computational cost. In this work, novel approach to perform the simulation photodetector signals from time projection chamber EXO-200 experiment is demonstrated. The method based Wasserstein Network - deep learning technique allowing for implicit non-parametric estimation population distribution given set objects. Our network real calibration data...
We report on a comparison between the theoretically predicted and experimentally measured spectra of first-forbidden nonunique β-decay transition 137Xe(7/2−)→137Cs(7/2+). The experimental data were acquired by EXO-200 experiment during deployment an AmBe neutron source. ultralow background environment EXO-200, together with dedicated source analysis procedures, allowed for collection pure sample decays, estimated signal to ratio more than 99 1 in energy range from 1075 4175 keV. In addition...
The search for neutrinoless double beta decay probes the fundamental properties of neutrinos, including whether or not neutrino and antineutrino are distinct. Double detectors large expensive, so background reduction is essential extracting highest sensitivity. identification, 'tagging', $^{136}$Ba daughter atom from $^{136}$Xe provides a technique eliminating backgrounds in nEXO experiment. tagging scheme studied this work utilizes cryogenic probe to trap barium solid xenon, where tagged...
We report on the performance of silicon photomultiplier (SiPM) light sensors operating in electric field strength up to 30 kV/cm and at a temperature 149 K, relative their absence an external field. The SiPM devices used this study show stable gain, photon detection efficiency, rates correlated pulses, when exposed fields, within estimated uncertainties. No visible damage surface was caused by exposure.
The breakdown voltage of silicon sensors without special surface is known to be affected by the ambient humidity. To understand sensor's humidity sensitivity, Synopsys TCAD was used simulate n-in-p test structures for different effective relative Photon emission hot electrons imaged with a microscope locate in edge-region sensor. Top-Transient Current Technique measure charge transport near region Using measurements and simulations, evolution electric field, carrier densities avalanche...
An important characteristic of silicon-based particle detectors, such as those used for the forthcoming ATLAS ITk upgrade HL-LHC, is leakage current. This evaluated in quality control stage new strip sensors by performing an IV measurement, where are biased up to −700V, typically showing low and stable However, some can exhibit a sudden current increase during so-called early breakdown, making sensor unusable. The analysis these breakdown conditions consists visual inspection using...