RustBCA: A High-Performance Binary-Collision-Approximation Code for Ion-Material Interactions

Drobny, Jon; Curreli, Davide

doi:10.21105/joss.03298

Cited by 16 publications

(10 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A computational model of the problem was constructed using tools from the US SciDAC-PSI workflow on Plasma-Surface Interactions [15]. In the present study, a limited subset of the workflow was used, including: (a) the hPIC [16] particle-incell code for the solution of the near-surface plasma and the determination of the energy-angle distributions of the ions impacting on the surfaces; and (b) the combined, binarycollision approximation (BCA) tools, F-TRIDYN and Rust-BCA [17,18], which addresses a variety of ion-surface interaction processes, such as ion implantation, reflection, and impurity sputtering. The latter, combined BCA tools, will be henceforth referred to simply as RustBCA.…”

Section: Computational Tools For the Outboard Limiter Studymentioning

confidence: 99%

Characterizing W sources in the all-W wall, all-RF WEST tokamak environment^{^*
,
^**}

Unterberg

Marandet

Curreli

et al. 2022

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

Experimental data, together with interpretive modeling tools, are examined to study trends in the tungsten (W) source in the all-W environment of the WEST tokamak, with significant focus away from the divertor. In particular, a poloidal limiter protecting an Ion Cyclotron Resonance Heating (ICRH) antenna is used as proxy for main chamber sourcing. The key study is carried out by stepping up Lower Hybrid Current Drive (LHCD) power, as the only auxiliary power source. The dependence of the W source from both the divertor and this outboard limiter on the total power crossing the separatrix, PSEP, show that although the main chamber source is substantially lower than the divertor source, it scales similarly with PSEP. Intepretive modeling of the limiter source is carried out with a Particle-in-Cell (PIC) sheath model coupled to a surface sputtering model. Oxygen is used as a proxy for all light impurity species allowing for characterization of the critical W erosion regions. To get a good quantitative match to the data, it is necessary to assume that the oxygen arrives at the surface mostly at high ionization stages (4+ and above). A separative simulation with SOLEDGE-EIRENE, constrained to measured upstream scrape-off-layer plasma profiles, gives oxygen fractional abundances that are compatible with the PIC simulation result. This is understood to arise from transport processes that dominate over recombination. Substituting the LHCD by ICRH, in an equivalent experiment, the local W source exhibits a x3 enhancement. This can be matched by the simulation, by assuming local RF electric field rectification, based on ~100eV peak-to-peak, near-antennna electric field. This work has highlighted the particular importance of understanding the ion charge state balance of light impurities as these are most likely the dominant sputtering species in fusion devices with high-Z walls

show abstract

Section: Computational Tools For the Outboard Limiter Studymentioning

confidence: 99%

Characterizing W sources in the all-W wall, all-RF WEST tokamak environment^{^*
,
^**}

Unterberg

Marandet

Curreli

et al. 2022

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

show abstract

“…Plugging in the average experimental STT to obtain γ in equation (24) for each of the four densities in figure 6 successfully reproduces the observed admittance broadening. Figure 8 highlights the damping trend for these four densities (as well as a few additional ones) by comparing the full-width half-max (FWHM) to γ.…”

Section: Ion Admittance Damping Due To Sheath Transit Timementioning

confidence: 55%

“…A kinetic modelling study of IEADs for RF sheaths on ICRH antennas was carried out in [23], with the results compared to a fluid code. The present study advances such Debye-scale modelling one step further by passing the IEADs to RustBCA [24], a ion-material interaction code, to obtain accurate sputtering yields.…”

Section: Introductionmentioning

confidence: 99%

Resonance in radio frequency sheath admittance and enhanced impurity emission near the ion cyclotron frequency

2023

Self Cite

View full text Add to dashboard Cite

Ion cyclotron resonance heating (ICRH) is of considerable interest among all auxiliary heating techniques, because it transfers power directly to ions, targets the high density core, and involves the cheapest radio-frequency (RF) components. During ICRH operation, RF sheaths form on the ICRH antenna itself, nearby hardware, and far-field surfaces. These sheaths are associated with large hot-spot formation and impurity emissions. This work presents high-resolution numerical modelling of RF sheaths in nuclear fusion scenarios using hPIC2, a Debye-scale particle-in-cell code. The modelling reveals a new RF sheath phenomenon which occurs when the radio frequency is resonant with a species ion cyclotron frequency or harmonic in an oblique magnetic field. This resonance of the RF sheath causes modifications of the energy-angle distributions of the ions impacting on the walls, with consequent increase in wall impurity emission. Due to the 1/R scaling of the magnetic field in a tokamak, such cases are possible on divertor or vacuum chamber surfaces, depending on the geometry of the tokamak and the RF heating scenario. A simple physics interpretation using a driven damped harmonic oscillator is proposed, where the ion sheath transit time plays the role of damping the RF sheath admittance. Critically, the resonance leads to increased ion heat flux at the wall as well as increased physical sputtering, despite a lack of increase in RF rectified sheath potential.

show abstract

“…The universal ZBL potential [29] was also used in the open-source binary collision approximation code RustBCA [30] to calculate approximate ion ranges and straggling. The classic codes SRIM and TRIM were also used to calculate the ion range and straggling as well as stopping cross section curves.…”

Section: Introductionmentioning

confidence: 99%

Elastic scattering cross sections and transport of tin ions in extreme ultraviolet lithography sources

Bartlett,

Herschberg,

Crouse

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

Energetic tin ions are created by laser produced plasmas in extreme-ultraviolet lithography sources where hydrogen is used as a buffer gas. In this study, the quantum chemistry code NWChem is used to calculate the interatomic potential between singly ionized tin and molecular hydrogen. The interatomic potential was fit by an inverse-power potential, a modified universal ZBL potential, and a two-piece-Lennard-Jones potential which were in turn used to calculate the classical distance of closest approach, scattering angle, total elastic scattering cross sections. Furthermore, the universal Ziegler-Biersack-Littmark (ZBL) potential was used in the open-source binary collision approximation codes RustBCA as well as Stopping Range in Matter and Transport of Ion in Matter (SRIM/TRIM) to calculate ion ranges, straggling, and stopping cross sections in a hydrogen gas target.

show abstract

RustBCA: A High-Performance Binary-Collision-Approximation Code for Ion-Material Interactions

Cited by 16 publications

References 23 publications

Characterizing W sources in the all-W wall, all-RF WEST tokamak environment^{^*
,
^**}

Characterizing W sources in the all-W wall, all-RF WEST tokamak environment^{^*
,
^**}

Resonance in radio frequency sheath admittance and enhanced impurity emission near the ion cyclotron frequency

Elastic scattering cross sections and transport of tin ions in extreme ultraviolet lithography sources

Contact Info

Product

Resources

About

RustBCA: A High-Performance Binary-Collision-Approximation Code for Ion-Material Interactions

Cited by 16 publications

References 23 publications

Characterizing W sources in the all-W wall, all-RF WEST tokamak environment * , **

Characterizing W sources in the all-W wall, all-RF WEST tokamak environment * , **

Resonance in radio frequency sheath admittance and enhanced impurity emission near the ion cyclotron frequency

Elastic scattering cross sections and transport of tin ions in extreme ultraviolet lithography sources

Contact Info

Product

Resources

About

Characterizing W sources in the all-W wall, all-RF WEST tokamak environment^{^*
,
^**}

Characterizing W sources in the all-W wall, all-RF WEST tokamak environment^{^*
,
^**}