K. Altenmüller
A5104581407- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- CCD and CMOS Imaging Sensors
- Photocathodes and Microchannel Plates
- Solar and Space Plasma Dynamics
Universidad de Zaragoza
2020-2024
Technical University of Munich
2014-2022
Université Paris-Saclay
2022
Institut de Recherche sur les Lois Fondamentales de l'Univers
2022
CEA Paris-Saclay
2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2022
Max Planck Institute for Extraterrestrial Physics
2014
A bstract This article describes BabyIAXO, an intermediate experimental stage of the International Axion Observatory (IAXO), proposed to be sited at DESY. IAXO is a large-scale axion helioscope that will look for axions and axion-like particles (ALPs), produced in Sun, with unprecedented sensitivity. BabyIAXO conceived test all subsystems (magnet, optics detectors) relevant scale final system thus serve as prototype IAXO, but same time fully-fledged physics reach itself, potential discovery....
The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in 19.74 $\mu$eV to 22.47 mass range. detection concept follows Sikivie haloscope principle, where Dark Matter convert into photons within a resonator immersed magnetic field. is an array of four individual rectangular cavities inserted strong phase-matched maximize sensitivity. Here we report on data acquired 4124 h from 2019 2021. Each cavity equipped with fast frequency tuning mechanism...
We present extensive optical and near-infrared photometric spectroscopic observations of the stripped-envelope (SE) supernova SN 2010as. Spectroscopic peculiarities, such as initially weak helium features low expansion velocities with a nearly flat evolution, place this object in small family events previously identified transitional Type Ib/c supernovae (SNe). There is ubiquitous evidence hydrogen, albeit weak, SNe, indicating that they are fact peculiar kind IIb SNe we name "flat-velocity...
The REST-for-Physics (Rare Event Searches Toolkit for Physics) framework is a ROOT-based solution providing the means to process and analyze experimental or Monte Carlo event data. Special care has been taken on traceability of code validation results produced within framework, together with connectivity between data stored registered through specific version metadata members. development was originally motivated cover needs at Rare experiments (experiments looking phenomena having extremely...
Hypothetical axions provide a compelling explanation for dark matter and could be emitted from the hot solar interior. The CERN Axion Solar Telescope has been searching via their back conversion to x-ray photons in 9-T 10-m long magnet directed toward Sun. We report on an extended run with International Observatory pathfinder detector, doubling previous exposure time. detector was operated xenon-based gas mixture part of new run, providing technical insights future configurations. No counts...
This article describes BabyIAXO, an intermediate experimental stage of the International Axion Observatory (IAXO), proposed to be sited at DESY. IAXO is a large-scale axion helioscope that will look for axions and axion-like particles (ALPs), produced in Sun, with unprecedented sensitivity. BabyIAXO conceived test all subsystems (magnet, optics detectors) relevant scale final system thus serve as prototype IAXO, but same time fully-fledged physics reach itself, potential discovery. The...
In this paper we present measurements performed with a Micromegas X-ray detector setup. The is prototype in the context of BabyIAXO helioscope, which under construction to search for an emission hypothetical axion particle from Sun. An important component such helioscope low background high efficiency 1–10 keV energy range. goal measurement was study techniques discrimination. addition common used multi-layer veto system designed tag cosmic-ray induced neutron background. Over effective time...
Rare event searches require extreme radiopurity in all detector components. This includes the active medium, which case of gaseous detectors, is operating gas. The gases used typically include noble gas mixtures with molecular quenchers. Purification these required to achieve desired performance, however, purifiers are known emanate 222 Rn, a potential source background. Several studied for their O 2 and H purification efficiency Rn emanation rates, aiming identify lowest-Rn options....
We present the IDeF-X HDBD integrated circuit, our latest 32-channel application specified circuit devoted to semiconductor photon counting X-ray detectors, designed read charges ranging from −40 40 fC. The chip reaches an equivalent noise charge (ENC) floor of 17 electrons rms and is optimized for low input capacitance (< 10 pF). Each channel based on sensitive amplifier (CSA) followed by a CR-RC <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
BabyIAXO is a helioscope under construction to search for an emission of the axion particle from Sun. At same time it serves as intermediate stage towards International Axion Observatory (IAXO). An integral component this experiment low background X-ray detector with high efficiency in 1–10 keV energy range. Micromegas detectors are considered baseline technology thanks relatively and very level. Other technologies developed reach better resolution while maintaining level also study. In...
Axions are a natural consequence of the Peccei-Quinn mechanism, most compelling solution to strong-CP problem. Similar axion-like particles (ALPs) also appear in number possible extensions Standard Model, notably string theories. Both axions and ALPs very well motivated candidates for Dark Matter, addition, they would be copiously produced at sun’s core. A relevant effort during last decade has been CAST experiment CERN, sensitive axion helioscope to-date. The International Axion Observatory...
It has been previously advocated that the presence of daily and annual modulations axion flux on Earth's surface may dramatically change strategy searches. The arguments were based so-called Axion Quark Nugget (AQN) dark matter model which was originally put forward to explain similarity visible cosmological densities $\Omega_{\rm dark}\sim \Omega_{\rm visible}$. In this framework, population galactic axions with mass $ 10^{-6} {\rm eV}\lesssim m_a\lesssim 10^{-3}{\rm eV}$ velocity $\langle...
Surface contamination of $^{222}$Rn progeny from the $^{238}$U natural decay chain is one most difficult background contributions to measure in rare event searches experiments. In this work we propose AlphaCAMM, a gaseous chamber read with segmented Micromegas, for direct measurement $^{210}$Pb surface flat samples. The detection concept exploits readout capabilities Micromegas detectors reconstruction $^{210}$Po alpha tracks increase signal-to-background ratio. We report here on design and...
The International AXion Observatory (IAXO) is a large scale axion helioscope that will look for axions and axion-like particles produced in the Sun with unprecedented sensitivity. BabyIAXO an intermediate experimental stage be hosted at DESY (Germany) test all IAXO subsystems serving as prototype but same time fully-fledged potential discovery. One of crucial components project ultra-low background X-ray detectors image photons by conversion experiment. baseline detection technology this...
Surface contamination of $^{222}$Rn progeny from the $^{238}$U natural decay chain is one most difficult background contributions to measure in rare event searches experiments. In this work we propose AlphaCAMM, a gaseous chamber read with segmented Micromegas, for direct measurement $^{210}$Pb surface flat samples. The detection concept exploits readout capabilities Micromegas detectors reconstruction $^{210}$Po alpha tracks increase signal-to-background ratio. We report here on design and...