K. Nikolopoulos
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View article: Accelerating Garfield++ with CUDA
Accelerating Garfield++ with CUDA Open
Garfield++ is extensively used within the gaseous detector community for comprehensive detector simulations, supporting the full experimental life cycle from design to operation and calibration. The emergence of micro-pattern gaseous detec…
View article: Materials Design for the Synthesis of High Strength Radiopure Copper Alloys for Rare Event Detection
Materials Design for the Synthesis of High Strength Radiopure Copper Alloys for Rare Event Detection Open
Additive-free electroformed copper has emerged as the material of choice in exceptionally radiopure detectors for rare-event searches, based on its radiopurity, physical properties, and affordability. However, copper is ductile and of limi…
View article: Ionization yield in a methane-filled spherical proportional counter
Ionization yield in a methane-filled spherical proportional counter Open
International audience
View article: Transforming a rare event search into a not-so-rare event search in real-time with deep learning-based object detection
Transforming a rare event search into a not-so-rare event search in real-time with deep learning-based object detection Open
Deep learning-based object detection algorithms enable the simultaneous classification and localization of any number of objects in image data. Many of these algorithms are capable of operating in real-time on high resolution images, attri…
View article: Enhancing European Cooperation in the Search for Dark Matter
Enhancing European Cooperation in the Search for Dark Matter Open
The search for dark matter is an exciting topic that is pursued in different communities over a wide range of masses and using a variety of experimental approaches. The result is a strongly correlated matrix of activities across Europe and…
View article: The International Axion Observatory (IAXO): case, status and plans. Input to the European Strategy for Particle Physics
The International Axion Observatory (IAXO): case, status and plans. Input to the European Strategy for Particle Physics Open
The International Axion Observatory (IAXO) is a next-generation axion helioscope designed to search for solar axions with unprecedented sensitivity. IAXO holds a unique position in the global landscape of axion searches, as it will probe a…
View article: Searches for Light Dark Matter with Spherical Proportional Counters
Searches for Light Dark Matter with Spherical Proportional Counters Open
Elucidating the nature of dark matter is a key priority that would involve discovering new fundamental physics and is essential for understanding the structure and evolution of the universe. Despite the decades-long ever-more-sensitive sea…
View article: Measurement of scintillation from proportional electron multiplication in liquid xenon using a needle
Measurement of scintillation from proportional electron multiplication in liquid xenon using a needle Open
Charge amplification in liquids could provide single-phase xenon time projection chambers with background discrimination and fiducialisation capabilities similar to those found in dual-phase detectors. Although efforts to achieve the high …
View article: Search for Light Dark Matter with NEWS-G at the Laboratoire Souterrain de Modane Using a Methane Target
Search for Light Dark Matter with NEWS-G at the Laboratoire Souterrain de Modane Using a Methane Target Open
The NEWS-G direct detection experiment uses spherical proportional counters to search for light dark matter candidates. New results from a 10 day physics run with a $135\,\mathrm{cm}$ in diameter spherical proportional counter at the Labor…
View article: migYOLO - An end-to-end YOLOv8-based object detection pipeline for CMOS camera images recorded by the MIGDAL experiment
migYOLO - An end-to-end YOLOv8-based object detection pipeline for CMOS camera images recorded by the MIGDAL experiment Open
migYOLO v1.0.0 migYOLO is the software accompanying the MIGDAL collaboration paper titled Transforming a rare event search into a not-so-rare event search in real-time with deep learning-based object detection. This package includes model …
View article: Measurement of scintillation from proportional electron multiplication in liquid xenon using a needle
Measurement of scintillation from proportional electron multiplication in liquid xenon using a needle Open
Charge amplification in liquids could provide single-phase xenon time projection chambers with background discrimination and fiducialisation capabilities similar to those found in dual-phase detectors. Although efforts to achieve the high …
View article: First operation of an ACHINOS-equipped spherical proportional counter with individual anode read-out
First operation of an ACHINOS-equipped spherical proportional counter with individual anode read-out Open
The multi-anode sensor ACHINOS revolutionised the capabilities of the spherical proportional counter by enabling large-size, high-pressure, operation and TPC-like reconstruction capabilities through individual anode read-out. First measure…
View article: Exploring light dark matter with the DarkSPHERE spherical proportional counter electroformed underground at the Boulby Underground Laboratory
Exploring light dark matter with the DarkSPHERE spherical proportional counter electroformed underground at the Boulby Underground Laboratory Open
We present the conceptual design and the physics potential of DarkSPHERE, a proposed 3 m in diameter spherical proportional counter electroformed underground at the Boulby Underground Laboratory. This effort builds on the R&D performed and…
View article: First operation of an ACHINOS-equipped Spherical Proportional Counter with individual anode read-out
First operation of an ACHINOS-equipped Spherical Proportional Counter with individual anode read-out Open
The multi-anode sensor ACHINOS revolutionised the capabilities of the spherical proportional counter by enabling large-size, high-pressure, operation and TPC-like reconstruction capabilities through individual anode read-out. First measure…
View article: The MIGDAL experiment: Measuring a rare atomic process to aid the search for dark matter
The MIGDAL experiment: Measuring a rare atomic process to aid the search for dark matter Open
We present the Migdal In Galactic Dark mAtter expLoration (MIGDAL) experiment aiming at the unambiguous observation and study of the so-called Migdal effect induced by fast-neutron scattering. It is hoped that this elusive atomic process c…
View article: Performance of a spherical high pressure gas TPC for neutrino magnetic moment measurement
Performance of a spherical high pressure gas TPC for neutrino magnetic moment measurement Open
The measurement of neutrino magnetic moment larger than $10^{-19}μ_B$ would be a clear signature of physics beyond the standard model other than the existence of massive Dirac neutrinos. The use of a spherical proportional counter detector…
View article: Neutron spectroscopy with N<sub>2</sub>-filled high-pressure large-volume spherical proportional counters
Neutron spectroscopy with N<sub>2</sub>-filled high-pressure large-volume spherical proportional counters Open
Precise in-situ measurements of the neutron flux in underground laboratories is crucial for direct dark matter searches, as neutron induced backgrounds can mimic the typical dark matter signal. The development of a novel neutron spectrosco…
View article: ACHINOS: a multi-anode read-out for position reconstruction and tracking with spherical proportional counters
ACHINOS: a multi-anode read-out for position reconstruction and tracking with spherical proportional counters Open
The spherical proportional counter is a versatile gaseous detector with physics applications ranging from rare event searches to fast neutron spectroscopy. In its simplest form, the detector operates with a single channel read-out, and use…
View article: Ionisation quenching factors from W-values in pure gases for rare event searches
Ionisation quenching factors from W-values in pure gases for rare event searches Open
The effect of ionisation quenching for ions is critical for experiments relying on the measurement of low energy recoils, such as direct Dark Matter searches. We present ionisation quenching factor estimates over a range of energies for pr…
View article: Quenching factor measurements of neon nuclei in neon gas
Quenching factor measurements of neon nuclei in neon gas Open
The NEWS-G collaboration uses Spherical Proportional Counters (SPCs) to search for weakly interacting massive particles (WIMPs). In this paper, we report the first measurements of the nuclear quenching factor in neon gas at \SI{2}{bar} usi…
View article: Measurements of the ionization efficiency of protons in methane
Measurements of the ionization efficiency of protons in methane Open
The amount of energy released by a nuclear recoil ionizing the atoms of the active volume of detection appears "quenched" compared to an electron of the same kinetic energy. This different behavior in ionization between electrons and nucle…
View article: Solar Kaluza-Klein axion search with NEWS-G
Solar Kaluza-Klein axion search with NEWS-G Open
International audience
View article: Fast Neutron Spectroscopy with a High-pressure Nitrogen-filled Large Volume Spherical Proportional Counter
Fast Neutron Spectroscopy with a High-pressure Nitrogen-filled Large Volume Spherical Proportional Counter Open
We present a fast neutron spectroscopy system based on a nitrogen-filled, large volume gaseous detector, the Spherical Proportional Counter. The system has been successfully operated up to gas pressure of 1.5 bar. Neutron energy is estimat…