Mónika Varga-Kőfaragó

Modeling charge collection in silicon pixel detectors for proton therapy applications Open

Alexander Schilling, Max Aehle, J. Alme, G. G. Barnaföldi, G. Bíró , et al. · 2025

Objective. Monolithic active pixel sensors are used for charged particle tracking in many applications, from medical physics to astrophysics. The Bergen pCT collaboration designed a sampling calorimeter for proton computed tomography, base…

Reconstruction of proton relative stopping power with a granular calorimeter detector model Open

Max Aehle, J. Alme, G. G. Barnaföldi, G. Bíró, T. Bodova , et al. · 2025

Proton computed tomography (pCT) aims to facilitate precise dose planning for hadron therapy, a promising and effective method for cancer treatment. Hadron therapy utilizes protons and heavy ions to deliver well focused doses of radiation,…

Exploration of differentiability in a proton computed tomography simulation framework Open

Max Aehle, J. Alme, G. G. Barnaföldi, Johannes Blühdorn, T. Bodova , et al. · 2023

Objective. Gradient-based optimization using algorithmic derivatives can be a useful technique to improve engineering designs with respect to a computer-implemented objective function. Likewise, uncertainty quantification through computer …

Uncertainty-aware spot rejection rate as quality metric for proton therapy using a digital tracking calorimeter Open

Alexander Schilling, Max Aehle, J. Alme, G. G. Barnaföldi, T. Bodova , et al. · 2023

Objective. Proton therapy is highly sensitive to range uncertainties due to the nature of the dose deposition of charged particles. To ensure treatment quality, range verification methods can be used to verify that the individual spots in …

The Bergen proton CT system Open

Max Aehle, J. Alme, G. G. Barnaföldi, T. Bodova, V. Borshchov , et al. · 2023

The Bergen proton Computed Tomography (pCT) is a prototype detector under construction. It aims to have the capability to track and measure ions’ energy deposition to minimize uncertainty in proton treatment planning. It is a high granular…

Exploration of Differentiability in a Proton Computed Tomography Simulation Framework Open

Max Aehle, J. Alme, G. G. Barnaföldi, Johannes Blühdorn, T. Bodova , et al. · 2022

Objective. Algorithmic differentiation (AD) can be a useful technique to numerically optimize design and algorithmic parameters by, and quantify uncertainties in, computer simulations. However, the effectiveness of AD depends on how "well-…

Observation of a multiplicity dependence in the $p_{\rm T}$-differential charm baryon-to-meson ratios in proton-proton collisions at $\sqrt{s} = 13$ TeV Open

S. Acharya, S. Y. Noh, G. Bíró, J. Otwinowski, S. A. Bysiak , et al. · 2022

The production of prompt D0, Ds+, and Λc+ hadrons, and their ratios, Ds+/D0 and Λc+/D0, are measured in proton–proton collisions at $\sqrt{s}$ = 13 TeV at midrapidity (|y|<0.5) with the ALICE detector at the LHC. The measurements are perfo…

Investigating particle track topology for range telescopes in particle radiography using convolutional neural networks Open

Helge Egil Seime Pettersen, Max Aehle, J. Alme, G. G. Barnaföldi, V. Borshchov , et al. · 2021

Proton computed tomography (pCT) and radiography (pRad) are proposed modalities for improved treatment plan accuracy and in situ treatment validation in proton therapy. The pCT system of the Bergen pCT collaboration is able to handl…

Measurements of mixed harmonic cumulants in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}}=5.02$ TeV Open

S. Acharya, S. Y. Noh, G. Bíró, J. Otwinowski, S. A. Bysiak , et al. · 2021

Correlations between moments of different flow coefficients are measured in Pb-Pb collisions at $\\sqrt{s_{\\rm NN}} = 5.02$ TeV recorded with the ALICE detector. These new measurements are based on multiparticle mixed harmonic cumulants c…

Helium radiography with a digital tracking calorimeter—a Monte Carlo study for secondary track rejection Open

Helge Egil Seime Pettersen, Lennart Volz, Jarle Rambo Sølie, J. Alme, G. G. Barnaföldi , et al. · 2020

Radiation therapy using protons and heavier ions is a fast-growing therapeutic option for cancer patients. A clinical system for particle imaging in particle therapy would enable online patient position verification, estimation of the dose…

A High-Granularity Digital Tracking Calorimeter Optimized for Proton CT Open

J. Alme, G. G. Barnaföldi, R. Barthel, V. Borshchov, T. Bodova , et al. · 2020

A typical proton CT (pCT) detector comprises a tracking system, used to measure the proton position before and after the imaged object, and an energy/range detector to measure the residual proton range after crossing the object. The Bergen…

Image quality of list-mode proton imaging without front trackers Open

Jarle Rambo Sølie, Lennart Volz, Helge Egil Seime Pettersen, Pierluigi Piersimoni, O.H. Odland , et al. · 2020

List mode proton imaging relies on accurate reconstruction of the proton most likely path (MLP) through the patient. This typically requires two sets of position sensitive detector systems, one upstream (front) and one downstream (rear) of…

EUDAQ—a data acquisition software framework for common beam telescopes Open

P. Ahlburg, S. Arfaoui, J.-H. Arling, Heiko Augustin, David Barney , et al. · 2020

EUDAQ is a generic data acquisition software developed for use in conjunction with common beam telescopes at charged particle beam lines. Providing high-precision reference tracks for performance studies of new sensors, beam telescopes are…

Unveiling the strong interaction among hadrons at the LHC Open

G. Bíró, K. Piotrzkowski, S. A. Bysiak, P. Das, J. Bielčík , et al. · 2020

One of the key challenges for nuclear physics today is to understand from first principles the effective interaction between hadrons with different quark content. First successes have been achieved using techniques that solve the dynamics …

Characterization of monolithic CMOS pixel sensor chip with ion beams for application in particle computed tomography Open

Ganesh Jagannath Tambave, J. Alme, G. G. Barnaföldi, R. Barthel, A. van den Brink , et al. · 2019

Angular correlation results from ALICE Open

Mónika Varga-Kőfaragó · 2019

In heavy-ion collisions, the quark-gluon plasma is expected to be produced, which is an almost perfect liquid that made up the Universe a few microseconds after the Big Bang. In these collisions, jets are also formed from hadronizing parto…

Design optimization of a pixel-based range telescope for proton computed tomography Open

Helge Egil Seime Pettersen, J. Alme, G. G. Barnaföldi, R. Barthel, A. van den Brink , et al. · 2019

Medical Applications of the ALPIDE Detector Open

Mónika Varga-Kőfaragó · 2019

The CERN Large Hadron Collider (LHC) ALICE detector is undergoing a major upgrade in the Second Long Shutdown of the LHC in 2019–2020. During this upgrade, the innermost detector, the Inner Tracking System, will be completely replaced by a…

Study of Angular Correlations in Monte Carlo Simulations in Pb-Pb Collisions Open

Balázs Endre Szigeti, Mónika Varga-Kőfaragó · 2019

In two-particle angular correlation measurements, the distribution of charged hadron pairs are evaluated as a function of pseudorapidity ( Δ η ) and azimuthal ( Δ φ ) differences. In these correlations, jets manifest themselves as a near-s…

First observation of an attractive interaction between a proton and a multi-strange baryon Open

S. Acharya, Yosuke Watanabe, G. Bíró, Mónika Varga-Kőfaragó, Richard Daniel Majka , et al. · 2019

This work presents the first experimental observation of the attractive strong interaction between a proton and a multi-strange baryon (hyperon) $Ξ^-$. The result is extracted from two-particle correlations of combined $\rm{p}-Ξ^{-}$$\oplu…

Study of angular correlations in Monte Carlo simulations Open

Balázs Endre Szigeti, Mónika Varga-Kőfaragó · 2019

In two-particle angular correlation measurements the distribution of charged hadron pairs are evaluated as a function of pseudorapidity ($Δη$) and azimuthal ($Δφ$) differences. In these correlations, jets manifest themselves as a near-side…

Proton CT -- a novel diagnostic tool in cancer therapy Open

Mónika Varga-Kőfaragó · 2019

Radiotherapy is one of the main methods in the successful treatment of cancer. The tumor is irradiated with photons or charged particles (e.g. protons), and in the case of massive charged particles, the treatment results in less unnecessar…

The evolution of the near-side peak in two-particle number and transverse momentum correlations in Pb–Pb collisions from ALICE Open

Mónika Varga-Kőfaragó · 2019

Measurement of D$^0$, D$^+$, D$^{*+}$ and D$^+_{\rm s}$ production in Pb-Pb collisions at $\mathbf{\sqrt{s_{\rm NN}}}= 5.02$ TeV Open

S. Acharya, Y. Watanabe, G. Bíró, Mónika Varga-Kőfaragó, Richard Daniel Majka , et al. · 2018

We report measurements of the production of prompt D$^0$, D$^+$, D$^{*+}$ and D$^+_{\\rm s}$ mesons in Pb-Pb collisions at the centre-of-mass energy per nucleon-nucleon pair $\\sqrt{s_{\\rm NN}}=5.02$ TeV, in the centrality classes 0-10%, …

$\phi$ meson production at forward rapidity in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV Open

S. Acharya, Yosuke Watanabe, G. Bíró, Mónika Varga-Kőfaragó, Richard Daniel Majka , et al. · 2018

Anomalous Broadening of Jet-Peak Shapes in Pb-Pb Collisions and Characterization of Monolithic Active Pixel Sensors for the ALICE Inner Tracking System Upgrade Open

Mónika Varga-Kőfaragó · 2018

Two-particle angular correlations are presented from Pb-Pb and pp collisions at 2.76 TeV. These measurements are powerful tools to study jets in a transverse momentum regime where they cannot be reconstructed over the large fluctuating bac…

Upgrade of the inner tracking system of ALICE Open

Mónika Varga-Kőfaragó · 2015

The upgrade of the Inner Tracking System (ITS) of ALICE is planned for the second long shutdown of the LHC in 2019-2020.The ALICE physics program after the shutdown requires the ITS to have improved tracking capabilities and improved impac…

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