Žana Popović
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Žana Popović has a total of 82 co-authors. Here are the top co-authors by number of shared publications:
- Eric Matthias Hollmann
University of California
3 shared publications - Igor Bykov
General Atomics 2 , San Diego, California 92121
3 shared publications - Tyler Abrams
General Atomics 1 , San Diego, California 92121
3 shared publications - Andrey Lvovskiy
General Atomics, PO Box 85608, San Diego, CA 92186-5608, United States of America
2 shared publications - Carlos Paz-Soldan
Columbia University in the City of New York
2 shared publications - Claudio Marini
University of California San Diego
2 shared publications
Latest Publications
- Open Access
- 14 January 2026
- Published by Elsevier in Nuclear Materials and Energy
- Vol. 46
Overview of advanced plasma-facing materials testing for Fusion Pilot Plants at DIII-D
- 14 January 2026
- Published by Elsevier in Nuclear Materials and Energy
- Vol. 46
Open AccessOverview of advanced plasma-facing materials testing for Fusion Pilot Plants at DIII-D
- Open Access
- 2 January 2026
- Published by Elsevier in Nuclear Materials and Energy
- Vol. 46
Cr plasma-material-interaction in PISCES-RF: D thermal release, retention, and erosion
- 2 January 2026
- Published by Elsevier in Nuclear Materials and Energy
- Vol. 46
Open AccessCr plasma-material-interaction in PISCES-RF: D thermal release, retention, and erosion
- 29 January 2024
- Published by Elsevier in Journal of Nuclear Materials
- Vol. 592
Investigation of W-SiC compositionally graded films as a divertor material
- 29 January 2024
- Published by Elsevier in Journal of Nuclear Materials
- Vol. 592
Investigation of W-SiC compositionally graded films as a divertor material
- Open Access
- 4 November 2023
- Published by Elsevier in Nuclear Materials and Energy
- Vol. 37
Model validation of tungsten erosion and redeposition properties using biased tungsten samples on DiMES
- 4 November 2023
- Published by Elsevier in Nuclear Materials and Energy
- Vol. 37
Open AccessModel validation of tungsten erosion and redeposition properties using biased tungsten samples on DiMES
- Open Access
- 1 May 2023
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 94 (5)
The fast camera (Fastcam) imaging diagnostic systems on the DIII-D tokamak
Two camera systems are installed on the DIII-D tokamak at the toroidal positions of 90° (90° system) and 225° (225° system), respectively. The cameras have two types of relay optics, namely, a coherent optical fiber bundle and a periscope system. The periscope system provides absolute intensity calibration stability while sacrificing resolution (10 lp/mm), while the fiber system provides high resolution (16 lp/mm) while sacrificing calibration stability. The periscope is available only for the 90° system. The optics of the 225° system were designed for view stability, repeatability, and easy maintenance. The cameras are located inside optimized neutron, x ray and magnetic shielding in order to reduce electronics damage, reboots, and magnetic and neutron interference, increasing the overall system reliability. An automated filter wheel, providing remote filter change, allows for remote wavelength selection. A software suite automates camera acquisition and data storage, allowing for remote operation and reduced operator involvement. System metadata is used to streamline the data analysis workflow, particularly for intensity calibration. The spatial calibration uses multiple observable wall features, resulting in a reconstruction accuracy ≤2 cm.
- 1 May 2023
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 94 (5)
Open AccessThe fast camera (Fastcam) imaging diagnostic systems on the DIII-D tokamak
Two camera systems are installed on the DIII-D tokamak at the toroidal positions of 90° (90° system) and 225° (225° system), respectively. The cameras have two types of relay optics, namely, a coherent optical fiber bundle and a periscope system. The periscope system provides absolute intensity calibration stability while sacrificing resolution (10 lp/mm), while the fiber system provides high resolution (16 lp/mm) while sacrificing calibration stability. The periscope is available only for the 90° system. The optics of the 225° system were designed for view stability, repeatability, and easy maintenance. The cameras are located inside optimized neutron, x ray and magnetic shielding in order to reduce electronics damage, reboots, and magnetic and neutron interference, increasing the overall system reliability. An automated filter wheel, providing remote filter change, allows for remote wavelength selection. A software suite automates camera acquisition and data storage, allowing for remote operation and reduced operator involvement. System metadata is used to streamline the data analysis workflow, particularly for intensity calibration. The spatial calibration uses multiple observable wall features, resulting in a reconstruction accuracy ≤2 cm.
- 1 February 2022
- Published by AIP Publishing in Physics of Plasmas
- Vol. 29 (2) , 022503
Dynamic measurement of impurity ion transport in runaway electron plateaus in DIII-D
The first dynamic (time-dependent) measurements of impurity ion radial (cross field) and parallel (along-field) diffusion coefficients for post-disruption runaway electron plateaus are presented. Small (∼1 mm diameter) carbon or silicon pellets are fired into the edge of steady-state runaway electron (RE) plateaus, and the resulting radial and toroidal transport of singly charged impurity ions ( or ) is monitored with spatially distributed visible spectrometers. Consistent with previous steady-state particle balance estimates of radial transport, radial (cross field) diffusion coefficients are obtained, about 10 larger than expected from neo-classical theory. Parallel diffusion coefficients are estimated, also much ( ) larger than classical. It is speculated at present that these large diffusion coefficients may be due to turbulent transport. Indications of fairly significant (almost 2 ) toroidal variation in electron density are seen in the RE plateaus, and this appears to cause some toroidal variation in impurity radial diffusion rates. Indications of slow ( 1 Hz) toroidal rotation in the impurity ions are observed, although the uncertainty in this measurement is large.- 1 February 2022
- Published by AIP Publishing in Physics of Plasmas
- Vol. 29 (2) , 022503
Dynamic measurement of impurity ion transport in runaway electron plateaus in DIII-D
The first dynamic (time-dependent) measurements of impurity ion radial (cross field) and parallel (along-field) diffusion coefficients for post-disruption runaway electron plateaus are presented. Small (∼1 mm diameter) carbon or silicon pellets are fired into the edge of steady-state runaway electron (RE) plateaus, and the resulting radial and toroidal transport of singly charged impurity ions ( or ) is monitored with spatially distributed visible spectrometers. Consistent with previous steady-state particle balance estimates of radial transport, radial (cross field) diffusion coefficients are obtained, about 10 larger than expected from neo-classical theory. Parallel diffusion coefficients are estimated, also much ( ) larger than classical. It is speculated at present that these large diffusion coefficients may be due to turbulent transport. Indications of fairly significant (almost 2 ) toroidal variation in electron density are seen in the RE plateaus, and this appears to cause some toroidal variation in impurity radial diffusion rates. Indications of slow ( 1 Hz) toroidal rotation in the impurity ions are observed, although the uncertainty in this measurement is large.- 1 August 2021
- Published by AIP Publishing in Physics of Plasmas
- Vol. 28 (8) , 082510
Polarized imaging of visible synchrotron emission from runaway electron plateaus in DIII-D
A new approach to estimate the pitch angle of highly energetic postdisruption runaway electrons is presented by imaging the polarized runaway electron synchrotron emission. The vertical to horizontal polarization ratio is found to range between 3 and 14 in image-average studies looking at repeated shots as well as the polarization in a single discharge. Numerical studies with guiding center and full orbit simulations performed with the SOFT and KORC codes are given and compared to the experiment. The pitch angle evolution analyzed using a 1D impurity diffusion model in combination with kinetic simulations is also presented. These studies find agreement in the magnitude of the pitch angle, but not in the temporal rate of change of pitch angle. The measured pitch angle evolution timescale of order 50 ms falls between a modeled timescale of 20 ms in an equilibrium model and ≫100 ms in a nonequilibrium model.
- 1 August 2021
- Published by AIP Publishing in Physics of Plasmas
- Vol. 28 (8) , 082510
Polarized imaging of visible synchrotron emission from runaway electron plateaus in DIII-D
A new approach to estimate the pitch angle of highly energetic postdisruption runaway electrons is presented by imaging the polarized runaway electron synchrotron emission. The vertical to horizontal polarization ratio is found to range between 3 and 14 in image-average studies looking at repeated shots as well as the polarization in a single discharge. Numerical studies with guiding center and full orbit simulations performed with the SOFT and KORC codes are given and compared to the experiment. The pitch angle evolution analyzed using a 1D impurity diffusion model in combination with kinetic simulations is also presented. These studies find agreement in the magnitude of the pitch angle, but not in the temporal rate of change of pitch angle. The measured pitch angle evolution timescale of order 50 ms falls between a modeled timescale of 20 ms in an equilibrium model and ≫100 ms in a nonequilibrium model.