Stephen Becker ‒ LIONS ‐ EPFL

Research interests:

Convex optimization
Compressed sensing
Matrix completion

————————————————————————————————————————————————

Biography

Dr. Stephen Becker received his B.A. degrees in mathematics and in physics from Wesleyan University in 2005, and his Ph.D. degree in Applied & Computational Mathematics from the California Institute of Technology in 2011. Later he was a postdoctoral researcher hosted at the Laboratoire Jacques-Louis Lions in Paris 6, thanks to a fellowship by Foundation Sciences Mathématiques de Paris. In September 2011 he started working as the Goldstine Memorial Postdoc at the IBM Watson research lab. In fall 2014 he joined the department of Applied Math of University of Colorado Boulderas an Assistant Professor. His research interests are in large-scale methods for convex programming, non-convex optimization, and image processing.

————————————————————————————————————————————————

Links

Website: http://ugcs.caltech.edu/~srbecker/

————————————————————————————————————————————————

PUBLICATIONS

Mobilise-D insights to estimate real-world walking speed in multiple conditions with a wearable device

C. Kirk; A. Kuederle; M. E. Mico-Amigo; T. Bonci; A. Paraschiv-Ionescu et al.

Scientific Reports. 2024-01-19. Vol. 14, num. 1, p. 1754. DOI : 10.1038/s41598-024-51766-5.

PUBLICATIONS

Mobilise-D insights to estimate real-world walking speed in multiple conditions with a wearable device

The Forward Physics Facility at the High-Luminosity LHC

Monocrystalline 1.7-eV MgCdTe solar cells

Guidelines for the use and interpretation of assays for monitoring autophagy (4th edition)

Combinations of single-top-quark production cross-section measurements and |f$_{LV}$V$_{tb}$| determinations at $ \sqrt{s} $ = 7 and 8 TeV with the ATLAS and CMS experiments

Precision measurement of the $\Xi_{cc}^{++}$ mass

Isospin amplitudes in $\Lambda_b^0\to J/\psi \Lambda(\Sigma^0)$ and $\Xi_b^0\to J/\psi \Xi^0(\Lambda)$ decays

Ion cyclotron resonance heating scenarios for DEMO

Interpretative and predictive modelling of Joint European Torus collisionality scans

Self-consistent pedestal prediction for JET-ILW in preparation of the DT campaign

Recurrence Plots for Dynamic Analysis of Type-I ELMs at JET With a Carbon Wall

Deep neural networks for plasma tomography with applications to JET and COMPASS

Control of the hydrogen:deuterium isotope mixture using pellets in JET

Role of fast ion pressure in the isotope effect in JET L-mode plasmas

COREDIV numerical simulation of high neutron rate JET-ILW DD pulses in view of extension to JET-ILW DT experiments

A new mechanism for increasing density peaking in tokamaks: improvement of the inward particle pinch with edge E x B shearing

Modification of the Alfven wave spectrum by pellet injection

First principles and integrated modelling achievements towards trustful fusion power predictions for JET and ITER

Adaptive learning for disruption prediction in non-stationary conditions

The effect of beryllium oxide on retention in JET ITER-like wall tiles

Diagnostic of fast-ion energy spectra and densities in magnetized plasmas

Direct gyrokinetic comparison of pedestal transport in JET with carbon and ITER-like walls

Current Research into Applications of Tomography for Fusion Diagnostics

Erosion, screening, and migration of tungsten in the JET divertor

Investigation of deuterium trapping and release in the JET divertor during the third ILW campaign using TDS

Beryllium melting and erosion on the upper dump plates in JET during three ITER-like wall campaigns

Gyrokinetic analysis and simulation of pedestals to identify the culprits for energy losses using ‘fingerprints’

Comparison of the structure of the plasma-facing surface and tritium accumulation in beryllium tiles from JET ILW campaigns 2011-2012 and 2013-2014

A power-balance model of the density limit in fusion plasmas: application to the L-mode tokamak

Improved ERO modelling of beryllium erosion at ITER upper first wall panel using JET-ILW and PISCES-B experience

Novel method for determination of tritium depth profiles in metallic samples

Dynamic modelling of local fuel inventory and desorption in the whole tokamak vacuum vessel for auto-consistent plasma-wall interaction simulations

A wall-aligned grid generator for non-linear simulations of MHD instabilities in tokamak plasmas

Simulation of neutron emission in neutral beam injection heated plasmas with the real-time code RABBIT

First mirror test in JET for ITER: Complete overview after three ILW campaigns

Modelling of the effect of ELMs on fuel retention at the bulk W divertor of JET

RF sheath modeling of experimentally observed plasma surface interactions with the JET ITER-Like Antenna

Investigation of deuterium trapping and release in the JET ITER-like wall divertor using TDS and TMAP

The software and hardware architecture of the real-time protection of in-vessel components in JET-ILW

Deposition of impurity metals during campaigns with the JET ITER-like Wall

Beryllium global erosion and deposition at JET-ILW simulated with ERO2.0

Impact of ICRF on the scrape-off layer and on plasma wall interactions: From present experiments to fusion reactor

Determination of tungsten sources in the JET-ILW divertor by spectroscopic imaging in the presence of a strong plasma continuum

Modelling of tungsten erosion and deposition in the divertor of JET-ILW in comparison to experimental findings

Impact of fast ions on density peaking in JET: fluid and gyrokinetic modeling

Energetic ion losses ‘channeling’ mechanism and strategy for mitigation

EDGE2D-EIRENE simulations of the influence of isotope effects and anomalous transport coefficients on near scrape-off layer radial electric field

An assessment of nitrogen concentrations from spectroscopic measurements in the JET and ASDEX upgrade divertor

Geodesic acoustic mode evolution in L-mode approaching the L-H transition on JET

Radial variation of heat transport in L-mode JET discharges

Material migration and fuel retention studies during the JET carbon divertor campaigns

On a fusion born triton effect in JET deuterium discharges with H-minority ion cyclotron range of frequencies heating

Approximate analytic expressions using Stokes model for tokamak polarimetry and their range of validity

Full-orbit and drift calculations of fusion product losses due to explosive fishbones on JET

Measuring fast ions in fusion plasmas with neutron diagnostics at JET

Long-lived coupled peeling ballooning modes preceding ELMs on JET

Overview of the JET preparation for deuterium-tritium operation with the ITER like-wall

A locked mode indicator for disruption prediction on JET and ASDEX upgrade

Determination of isotope ratio in the divertor of JET-ILW by high-resolution H alpha spectroscopy: H-D experiment and implications for D-T experiment

Analysis of the outer divertor hot spot activity in the protection video camera recordings at JET

Tritium distributions on W-coated divertor tiles used in the third JET ITER-like wall campaign

Improved neutron activation dosimetry for fusion

Population modelling of the He II energy levels in tokamak plasmas: I. Collisional excitation model

Analysis of deposited layers with deuterium and impurity elements on samples from the divertor of JET with ITER-like wall

LSST: From Science Drivers to Reference Design and Anticipated Data Products

Precision measurement of the structure of the CMS inner tracking system using nuclear interactions

Combination of inclusive and differential $ \mathrm{t}\overline{\mathrm{t}} $ charge asymmetry measurements using ATLAS and CMS data at $ \sqrt{s}=7 $ and 8 TeV

Evidence of Be-9 + p nuclear reactions during 2 omega(CH) and hydrogen minority ICRH in JET-ILW hydrogen and deuterium plasmas

Effect of the relative shift between the electron density and temperature pedestal position on the pedestal stability in JET-ILW and comparison with JET-C

Equilibrium reconstruction at JET using Stokes model for polarimetry

Correlation of the tokamak H-mode density limit with ballooning stability at the separatrix

Plasma-wall interaction on the divertor tiles of JET ITER-like wall from the viewpoint of micro/nanoscopic observations

Control and data acquisition software upgrade for JET gamma-ray diagnostics

Tritium retention characteristics in dust particles in JET with ITER-like wall

14 MeV calibration of JET neutron detectors-phase 2: in-vessel calibration

On the potential of ruled-based machine learning for disruption prediction on JET

Dust generation in tokamaks: Overview of beryllium and tungsten dust characterisation in JET with the ITER-like wall

Impact of electron-scale turbulence and multi-scale interactions in the JET tokamak

On the Use of Transfer Entropy to Investigate the Time Horizon of Causal Influences between Signals