Publications (20)
The Infrared Absorption Band and Vibronic Structure of the Nitrogen-Vacancy Center in Diamond
P. Kehayias, M. W. Doherty, D. English +7
Negatively-charged nitrogen-vacancy (NV) color centers in diamond have generated much interest for use in quantum technology. Despite the progress made in developing their appl…
A Development Environment for Visual Physics Analysis
H. -P. Bretz, M. Brodski, M. Erdmann +11
The Visual Physics Analysis (VISPA) project integrates different aspects of physics analyses into a graphical development environment. It addresses the typical development cycle of…
Probing quantum capacitance in a 3D topological insulator
D. A. Kozlov, D. Bauer, J. Ziegler +6
We measure the quantum capacitance and probe thus directly the electronic density of states of the high mobility, Dirac type of two-dimensional electron system, which forms on the…
Visual Physics Analysis (VISPA) - Concepts and First Applications
O. Actis, M. Erdmann, R. Fischer +6
VISPA is a novel development environment for high energy physics analyses, based on a combination of graphical and textual steering. The primary aim of VISPA is to support physicis…
A quasi-continuous exhaust scenario for a fusion reactor: the renaissance of small edge localized modes
G. F. Harrer, M. Faitsch, L. Radovanovic +13
Tokamak operational regimes with small edge localized modes (ELMs) could be a solution to the problem of large transient heat loads in future fusion reactors because they provide q…
I-mode pedestal relaxation events at ASDEX Upgrade
D. Silvagni, T. Eich, T. Happel +16
The I-mode confinement regime can feature small edge temperature drops that can lead to an increase in the energy deposited onto the divertor targets. In this work, we show that th…
Detecting and polarizing nuclear spins with double resonance on a single electron spin
P. London, J. Scheuer, J. -M. Cai +11
We report the detection and polarization of nuclear spins in diamond at room temperature by using a single nitrogen-vacancy (NV) center. We use Hartmann-Hahn double resonance to co…
Redox evolution via gravitational differentiation on low mass planets: implications for abiotic oxygen, water loss and habitability
R. Wordsworth, L. Schaefer, R. Fischer
The oxidation of rocky planet surfaces and atmospheres, which arises from the twin forces of stellar nucleosynthesis and gravitational differentiation, is a universal process of ke…
Validation of gyrokinetic modelling of light impurity transport including rotation in ASDEX Upgrade
F. J. Casson, R. M. McDermott, C. Angioni +9
Upgraded spectroscopic hardware and an improved impurity concentration calculation allow accurate determination of boron density in the ASDEX Upgrade tokamak. A database of boron m…
On learning latent dynamics of the AUG plasma state
A. Kit, A. E. Järvinen, Y. R. J. Poels +5
In this work, we demonstrate the utility of state representation learning applied to modeling the time evolution of electron density and temperature profiles at ASDEX-Upgrade (AUG)…
Plasma response measurements of external magnetic perturbations using electron cyclotron emission and comparisons to 3D ideal MHD equilibrium
M. Willensdorfer, S. S. Denk, E. Strumberger +16
The plasma response from an external n = 2 magnetic perturbation field in ASDEX Upgrade has been measured using mainly electron cyclotron emission (ECE) diagnostics and a rigid rot…
Improving broadband displacement detection with quantum correlations
N. S. Kampel, R. W. Peterson, R. Fischer +5
Interferometers enable ultrasensitive measurement in a wide array of applications from gravitational wave searches to force microscopes. The role of quantum mechanics in the metrol…
Effect of resonant magnetic perturbations on low collisionality discharges in MAST and a comparison with ASDEX Upgrade
A. Kirk, W. Suttrop, Yueqiang Liu +19
Sustained ELM mitigation has been achieved on MAST and AUG using RMPs with a range of toroidal mode numbers over a wide region of low to medium collisionality discharges. The ELM e…
Applying the Background-Source separation algorithm to Chandra Deep Field South data
F. Guglielmetti, H. Boehringer, R. Fischer +2
A probabilistic two-component mixture model allows one to separate the diffuse background from the celestial sources within a one-step algorithm without data censoring. The backgro…
Background-Source Separation in astronomical images with Bayesian probability theory (I): the method
F. Guglielmetti, R. Fischer, V. Dose
A probabilistic technique for the joint estimation of background and sources with the aim of detecting faint and extended celestial objects is described. Bayesian probability theor…
Depth Profile Reconstruction from Rutherford Backscattering Data
U. V. Toussaint, K. Krieger, R. Fischer +1
An adaptive kernel method in the Bayesian framework together with a new simulation program for Rutherford backscattering spectroscopy (RBS) have been applied to the analysis of RBS…
Three dimensional boundary displacement due to stable ideal kink modes excited by external n=2 magnetic perturbations
M. Willensdorfer, E. Strumberger, W. Suttrop +15
In low-collisionality scenarios exhibiting mitigation of edge localized modes (ELMs), stable ideal kink modes at the edge are excited by externally applied magnetic perturbation (M…
Optical probing of mechanical loss of a Si_{3}N_{4} membrane below 100 mK
R. Fischer, N. S. Kampel, G. G. T. Assumpção +5
We report on low mechanical loss in a high-stress silicon nitride (Si_{3}N_{4}) membrane at temperatures below 100 mK. We isolate a membrane via a phononic shield formed within a s…
Observation of the rare decay from the combined analysis of CMS and LHCb data
The CMS, LHCb Collaborations, : +2807
A joint measurement is presented of the branching fractions and in proton-proton collisions at the LHC by the CMS and LHCb experiments. The data…
Integrated Data Analysis and Validation
R. Fischer, A. Bock, S. S. Denk +4
A major challenge in nuclear fusion research is the coherent combination of data from heterogeneous diagnostics and modelling codes for machine control and safety as well as physic…