Plasma Science and Fusion Center Dataverse

This archive contains all pre-print manuscript versions prior to actual publication in peer-reviewed journals, with associated data sets. This collection also includes contributions to conferences.

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11 to 20 of 570 Results

Neutronics simulations for the design of neutron flux monitors in SPARC Jun 21, 2025 Wang, X.; Gocht, R.; Ball, J.; Mackie, S.; Panontin, E.; Tinguely, R.A.; Raj, P.; Holmes, I.; Saltos, A.A.; Johnson, A.; Grieve, A., 2025, "Neutronics simulations for the design of neutron flux monitors in SPARC", https://doi.org/10.7910/DVN/LAQBQ0, Harvard Dataverse, V1 This paper presents the development and application of high-fidelity neutronic models of the SPARC tokamak for the design of neutron flux monitors (NFM) during plasma operations. NFMs measure the neutron flux in the tokamak hall which is related to fusion power via calibration. We have explored Boron-10 gamma-compensated ionization chambers (IC) an...
Image plate multi-scan response to fusion protons in the range of 1–14 MeV Jun 19, 2025 N. Vanderloo, M. Cufari, L. Russell, T. M. Johnson, J. Vargas, B. C. Foo, B. I. Buschmann, S. G. Dannhoff, A. DeVault, T. E. Evans, J. H. Kunimune, Y. Lawrence, J. A. Pearcy, B. L. Reichelt, C. W. Wink, M. Gatu Johnson, R. D. Petrasso, J. A. Frenje, C. K. Li, 2025, "Image plate multi-scan response to fusion protons in the range of 1–14 MeV", https://doi.org/10.7910/DVN/T3V71E, Harvard Dataverse, V1 Image plates (IPs) are a quickly recoverable and reusable radiation detector often used to measure proton and x-ray fluence in laser-driven experiments. Recently, IPs have been used in a proton radiography detector stack on the OMEGA laser, a diagnostic historically implemented with CR-39, or radiochromic film. The IPs used in this and other diagno...
Molybdenum Density Profiles in Alcator C-Mod Plasmas Jun 18, 2025 C.J. Perks, J.E. Rice, N.M. Cao, J.W. Hughes, N.T. Howard, E.S. Marmar, P. Rodriguez-Fernandez, F. Sciortino, C. Angioni, D. Fajardo and A. Loarte, 2025, "Molybdenum Density Profiles in Alcator C-Mod Plasmas", https://doi.org/10.7910/DVN/KV9XAS, Harvard Dataverse, V1 Molybdenum (Z = 42) density spatial profiles have been obtained for Alcator C-Mod L-, I- and H-mode plasmas from x-ray observations of the neon-like Mo^32+ 4D transition. Profile shapes range from flat to modestly peaked in the core. The observed peaking factors for molybdenum are in good agreement with those calculated by TGLF across all confineme...
Quadrupolar density structures in driven magnetic reconnection experiments with a guide field Jun 17, 2025 T. W. O. Varnish; J. Chen; S. Chowdhry; R. Datta; G. V. Dowhan; L. S. Horan, IV; N. M. Jordan; E. R. Neill; A. P. Shah; R. Shapovalov; B. J. Sporer; R. D. McBride; J. D. Hare, 2025, "Quadrupolar density structures in driven magnetic reconnection experiments with a guide field", https://doi.org/10.7910/DVN/IMQWDO, Harvard Dataverse, V1 Magnetic reconnection is a ubiquitous process in plasma physics, driving rapid and energetic events such as coronal mass ejections. Reconnection between magnetic fields with arbitrary shear can be decomposed into an anti-parallel reconnecting component and a non-reconnecting guide-field component, which is parallel to the reconnecting electric fiel...
Machine learning enhanced predictions of ICRF heating: Overcoming numerical limitations via data curation Jun 17, 2025 A. Sanchez-Villar; Z. Bai; N. Bertelli; E. W. Bethel; J. Hillairet; T. Perciano; S. Shiraiwa; G. M. Wallace; J. C. Wright, 2025, "Machine learning enhanced predictions of ICRF heating: Overcoming numerical limitations via data curation", https://doi.org/10.7910/DVN/XCXAVP, Harvard Dataverse, V1 In this work we present the development of robust surrogate models for Ion Cyclotron Range of Frequencies (ICRF) and High-Harmonic Fast Wave (HHFW) heating predictions in fusion plasmas. Building upon our previous efforts to achieve real-time capable models, we identify the cause of the outliers found using TORIC in certain HHFW heating scenarios....
Gas puff imaging of plasma turbulence in the magnetic island scrape-off layer of W7-X Jun 16, 2025 S.G. Baek, S. Ballinger, O. Grulke, C. Killer, A. von Stechow, J. L. TerryF. Scharmer, B. Shanahan, 2025, "Gas puff imaging of plasma turbulence in the magnetic island scrape-off layer of W7-X", https://doi.org/10.7910/DVN/SPG6CL, Harvard Dataverse, V1 The turbulence characteristics of the scrape-off-layer (SOL) plasma in the W7-X stellarator are investigated using a gas-puff-imaging (GPI) diagnostic, newly installed and operated during the OP 2.1 campaign. The SOL plasma on W7-X features a set of island divertors for heat and particle exhaust and provides a unique environment for studying SOL tu...
Modeling study of synergistic effects between lower hybrid and electron cyclotron current drive on EAST Jun 16, 2025 S.G. Baek, M.H. Li, W. Choi, P.T. Bonoli, B.J. Ding, A. Garofalo, G.M. Wallace, M. Wang, H. Xu, Q. Zang, H. Zhao, 2025, "Modeling study of synergistic effects between lower hybrid and electron cyclotron current drive on EAST", https://doi.org/10.7910/DVN/L00G5X, Harvard Dataverse, V1 Recent radio frequency (RF) current drive experiments in EAST provide an opportunity to investigate RF synergy effects between Electron Cyclotron (EC) and Lower Hybrid (LH) current drive. Synergy current is the excess current that can arise from overlapping two wave-particle resonance bands in the velocity phase space. In this work, a ray-tracing a...
Electron temperature gradient instability and transport analysis in NSTX and NSTX-U plasmas Jun 16, 2025 C. F. Clauser, T. Rafiq, J. Parisi, G. Avdeeva, W. Guttenfelder, E. Schuster, C. Wilson, 2025, "Electron temperature gradient instability and transport analysis in NSTX and NSTX-U plasmas", https://doi.org/10.7910/DVN/SJTAD2, Harvard Dataverse, V1 Extensive linear and nonlinear simulations to study electron temperature gradient (ETG) stability and thermal transport in National Spherical Torus Experiment (NSTX) and NSTX-U plasmas were performed using the fully electromagnetic gyrokinetic code CGYRO. Linear simulations were performed to determine ETG thresholds in different discharges, showing...
Cross-code comparison of the edge codes SOLPS-ITER, SOLEDGE2D and UEDGE in modelling a high-power neon-seeded scenario in the DTT Jun 16, 2025 M. Moscheni, M. Wigram, H. Wu, C. Meineri, C. Carati, E. De Marchi, M. Greenwald, P. Innocente, B. LaBombard, F. Subba, R. Zanino, 2025, "Cross-code comparison of the edge codes SOLPS-ITER, SOLEDGE2D and UEDGE in modelling a high-power neon-seeded scenario in the DTT", https://doi.org/10.7910/DVN/AE0J2B, Harvard Dataverse, V1 In this work, we cross-compare the state-of-the-art edge plasma codes SOLPS-ITER, SOLEDGE2D, and UEDGE in a reactor-relevant neon-seeded Divertor Tokamak Test scenario at nominal power, extending the simplified test-bed of Moscheni et al (2022 Nucl. Fusion 62 056009). Converged solutions targeting the same separatrix density and radiated power are...
Assessing the risk of proliferation via fissile breeding in ARC-class fusion power plants Jun 14, 2025 John L. Ball, Ethan E. Peterson, R. Scott Kemp, Sara E. Ferry, 2025, "Assessing the risk of proliferation via fissile breeding in ARC-class fusion power plants", https://doi.org/10.7910/DVN/BHRW6E, Harvard Dataverse, V1 Construction of a nuclear weapon requires access to kilogram-scale quantities of fissile material, which can be bred from fertile material like U-238 and Th-232 via neutron capture. Future fusion power plants, with total neutron source rates in excess of 1e20 n/s, could breed weapons-relevant quantities of fissile material on short timescales, posi...

Neutronics simulations for the design of neutron flux monitors in SPARC

Jun 21, 2025

Wang, X.; Gocht, R.; Ball, J.; Mackie, S.; Panontin, E.; Tinguely, R.A.; Raj, P.; Holmes, I.; Saltos, A.A.; Johnson, A.; Grieve, A., 2025, "Neutronics simulations for the design of neutron flux monitors in SPARC", https://doi.org/10.7910/DVN/LAQBQ0, Harvard Dataverse, V1

This paper presents the development and application of high-fidelity neutronic models of the SPARC tokamak for the design of neutron flux monitors (NFM) during plasma operations. NFMs measure the neutron flux in the tokamak hall which is related to fusion power via calibration. We have explored Boron-10 gamma-compensated ionization chambers (IC) an...

Image plate multi-scan response to fusion protons in the range of 1–14 MeV

Jun 19, 2025

N. Vanderloo, M. Cufari, L. Russell, T. M. Johnson, J. Vargas, B. C. Foo, B. I. Buschmann, S. G. Dannhoff, A. DeVault, T. E. Evans, J. H. Kunimune, Y. Lawrence, J. A. Pearcy, B. L. Reichelt, C. W. Wink, M. Gatu Johnson, R. D. Petrasso, J. A. Frenje, C. K. Li, 2025, "Image plate multi-scan response to fusion protons in the range of 1–14 MeV", https://doi.org/10.7910/DVN/T3V71E, Harvard Dataverse, V1

Image plates (IPs) are a quickly recoverable and reusable radiation detector often used to measure proton and x-ray fluence in laser-driven experiments. Recently, IPs have been used in a proton radiography detector stack on the OMEGA laser, a diagnostic historically implemented with CR-39, or radiochromic film. The IPs used in this and other diagno...

Molybdenum Density Profiles in Alcator C-Mod Plasmas

Jun 18, 2025

C.J. Perks, J.E. Rice, N.M. Cao, J.W. Hughes, N.T. Howard, E.S. Marmar, P. Rodriguez-Fernandez, F. Sciortino, C. Angioni, D. Fajardo and A. Loarte, 2025, "Molybdenum Density Profiles in Alcator C-Mod Plasmas", https://doi.org/10.7910/DVN/KV9XAS, Harvard Dataverse, V1

Molybdenum (Z = 42) density spatial profiles have been obtained for Alcator C-Mod L-, I- and H-mode plasmas from x-ray observations of the neon-like Mo^32+ 4D transition. Profile shapes range from flat to modestly peaked in the core. The observed peaking factors for molybdenum are in good agreement with those calculated by TGLF across all confineme...

Quadrupolar density structures in driven magnetic reconnection experiments with a guide field

Jun 17, 2025

T. W. O. Varnish; J. Chen; S. Chowdhry; R. Datta; G. V. Dowhan; L. S. Horan, IV; N. M. Jordan; E. R. Neill; A. P. Shah; R. Shapovalov; B. J. Sporer; R. D. McBride; J. D. Hare, 2025, "Quadrupolar density structures in driven magnetic reconnection experiments with a guide field", https://doi.org/10.7910/DVN/IMQWDO, Harvard Dataverse, V1

Magnetic reconnection is a ubiquitous process in plasma physics, driving rapid and energetic events such as coronal mass ejections. Reconnection between magnetic fields with arbitrary shear can be decomposed into an anti-parallel reconnecting component and a non-reconnecting guide-field component, which is parallel to the reconnecting electric fiel...

Machine learning enhanced predictions of ICRF heating: Overcoming numerical limitations via data curation

Jun 17, 2025

A. Sanchez-Villar; Z. Bai; N. Bertelli; E. W. Bethel; J. Hillairet; T. Perciano; S. Shiraiwa; G. M. Wallace; J. C. Wright, 2025, "Machine learning enhanced predictions of ICRF heating: Overcoming numerical limitations via data curation", https://doi.org/10.7910/DVN/XCXAVP, Harvard Dataverse, V1

In this work we present the development of robust surrogate models for Ion Cyclotron Range of Frequencies (ICRF) and High-Harmonic Fast Wave (HHFW) heating predictions in fusion plasmas. Building upon our previous efforts to achieve real-time capable models, we identify the cause of the outliers found using TORIC in certain HHFW heating scenarios....

Gas puff imaging of plasma turbulence in the magnetic island scrape-off layer of W7-X

Jun 16, 2025

S.G. Baek, S. Ballinger, O. Grulke, C. Killer, A. von Stechow, J. L. TerryF. Scharmer, B. Shanahan, 2025, "Gas puff imaging of plasma turbulence in the magnetic island scrape-off layer of W7-X", https://doi.org/10.7910/DVN/SPG6CL, Harvard Dataverse, V1

The turbulence characteristics of the scrape-off-layer (SOL) plasma in the W7-X stellarator are investigated using a gas-puff-imaging (GPI) diagnostic, newly installed and operated during the OP 2.1 campaign. The SOL plasma on W7-X features a set of island divertors for heat and particle exhaust and provides a unique environment for studying SOL tu...

Modeling study of synergistic effects between lower hybrid and electron cyclotron current drive on EAST

Jun 16, 2025

S.G. Baek, M.H. Li, W. Choi, P.T. Bonoli, B.J. Ding, A. Garofalo, G.M. Wallace, M. Wang, H. Xu, Q. Zang, H. Zhao, 2025, "Modeling study of synergistic effects between lower hybrid and electron cyclotron current drive on EAST", https://doi.org/10.7910/DVN/L00G5X, Harvard Dataverse, V1

Recent radio frequency (RF) current drive experiments in EAST provide an opportunity to investigate RF synergy effects between Electron Cyclotron (EC) and Lower Hybrid (LH) current drive. Synergy current is the excess current that can arise from overlapping two wave-particle resonance bands in the velocity phase space. In this work, a ray-tracing a...

Electron temperature gradient instability and transport analysis in NSTX and NSTX-U plasmas

Jun 16, 2025

C. F. Clauser, T. Rafiq, J. Parisi, G. Avdeeva, W. Guttenfelder, E. Schuster, C. Wilson, 2025, "Electron temperature gradient instability and transport analysis in NSTX and NSTX-U plasmas", https://doi.org/10.7910/DVN/SJTAD2, Harvard Dataverse, V1

Extensive linear and nonlinear simulations to study electron temperature gradient (ETG) stability and thermal transport in National Spherical Torus Experiment (NSTX) and NSTX-U plasmas were performed using the fully electromagnetic gyrokinetic code CGYRO. Linear simulations were performed to determine ETG thresholds in different discharges, showing...

Cross-code comparison of the edge codes SOLPS-ITER, SOLEDGE2D and UEDGE in modelling a high-power neon-seeded scenario in the DTT

Jun 16, 2025

M. Moscheni, M. Wigram, H. Wu, C. Meineri, C. Carati, E. De Marchi, M. Greenwald, P. Innocente, B. LaBombard, F. Subba, R. Zanino, 2025, "Cross-code comparison of the edge codes SOLPS-ITER, SOLEDGE2D and UEDGE in modelling a high-power neon-seeded scenario in the DTT", https://doi.org/10.7910/DVN/AE0J2B, Harvard Dataverse, V1

In this work, we cross-compare the state-of-the-art edge plasma codes SOLPS-ITER, SOLEDGE2D, and UEDGE in a reactor-relevant neon-seeded Divertor Tokamak Test scenario at nominal power, extending the simplified test-bed of Moscheni et al (2022 Nucl. Fusion 62 056009). Converged solutions targeting the same separatrix density and radiated power are...

Assessing the risk of proliferation via fissile breeding in ARC-class fusion power plants

Jun 14, 2025

John L. Ball, Ethan E. Peterson, R. Scott Kemp, Sara E. Ferry, 2025, "Assessing the risk of proliferation via fissile breeding in ARC-class fusion power plants", https://doi.org/10.7910/DVN/BHRW6E, Harvard Dataverse, V1

Construction of a nuclear weapon requires access to kilogram-scale quantities of fissile material, which can be bred from fertile material like U-238 and Th-232 via neutron capture. Future fusion power plants, with total neutron source rates in excess of 1e20 n/s, could breed weapons-relevant quantities of fissile material on short timescales, posi...

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