Beryllium release and beryllium transport in the tokamak UNITOR

Bessenrodt-Weberpals, M.; Hackmann, J.; Uhlenbusch, J.

doi:10.1016/0022-3115(87)90458-2

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Laser induced fluorescence [103,131,191,[429][430][431] (see Section 2.2.6) is a powerful technique for measuring $ in . Indeed, this technique measures separately the impurity number density in front of the source and the velocity distribution (via Doppler shifts), from which $ in can be calculated.…”

Section: Measurements Of Impurity Influx and Outfluxmentioning

confidence: 99%

Plasma boundary phenomena in tokamaks

1990

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Section: Measurements Of Impurity Influx and Outfluxmentioning

confidence: 99%

Plasma boundary phenomena in tokamaks

1990

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“…For a long time beryllium has been regarded as one of the possible candidate first wall materials in the nuclear fusion furnace chamber. The first experiments and transport studies with beryllium walls in tokamaks were carried out as early as in the late eighties on the UNITOR tokamak [1], and continued one decade later with the Be wall campaigns at JET [2,3]. Because of its low Z (low core plasma radiation losses), high oxygen gettering capability, reduced erosion and migration (with respect to carbon, the other leading plasma facing material), Be has been chosen as a first wall armor material in the main chamber of the first fusion reactor ITER [4,5] and has, therefore, been recently installed again at JET for the forthcoming 'ITER like wall' (ILW) campaign (operation starting in late 2011).…”

Section: Introductionmentioning

confidence: 99%

State-to-state electron impact cross sections for BeH⁺molecular ions in ITER-like fusion edge plasmas with Be walls

Celiberto

Janev

Reiter

2012

Plasma Phys. Control. Fusion

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BeH + molecules will be an important intermediary species present in fusion plasmas with Be walls (e.g. JET, ITER), both for impurity transport and spectroscopic studies. To enable such analyses the electron-impact-induced excitationsmolecular ion, occurring between the v i and v f vibrational levels of different electronic states (vibro-electronic transitions), have been studied using the Coulomb-Born approximation. The cross sections and rate coefficients for these transitions have been calculated in a broad energy and temperature range, respectively. Accurate analytic fit expressions have been derived for the cross sections and rate coefficients for the v i = v f = 0 case of considered electronic transitions that have correct asymptotic limits. It has been demonstrated that the cross sections and rate coefficients for v i , v f > 0 transitions satisfy approximate (to within 10%) scaling relationships that involve the transition energies and matrix elements of dipole transition moments only.

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“…The transport of BeH, BeD (and eventually BeT) in the JET scrape-off layer is important for tracking what happens to the tritium in the reactor, both for the future of JET and for ITER (Doerner et al 2007). In a plasma, with its large density of free electrons, processes involving electron collisions with BeH play an important role in detecting and tracking the movement and deposition of BeH around the reactor (Bessenrodt-Weberpals et al 1987). In particular a useful diagnostic is the radiative emission coming from the A 2 P  X 2 S + transition in BeD (Duxbury et al 1998, Nishijima et al 2008, Doerner et al 2009, where the initial excitation of BeD to the A-state is largely thought to originate in inelastic collisions of electrons with the molecule.…”

Section: Introductionmentioning

confidence: 99%

R-matrix calculations of electron impact electronic excitation of BeH

Darby-Lewis

Mašín

Tennyson

2017

J. Phys. B: At. Mol. Opt. Phys.

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The R-matrix method is used to perform high-level calculations of electron collisions with beryllium mono-hydride at its equilibrium geometry with a particular emphasis on electron impact electronic excitation. Several target and scattering models are considered. The calculations were performed using (1) the UKRMol suite which relies on the use of Gaussian type orbitals (GTOs) to represent the continuum and (2) using the new UKRMol+ suite which allows the inclusion of B-spline type orbitals in the basis for the continuum. The final closecoupling scattering models used the UKRMol+ code and a frozen core, valence full configuration interaction, method based on a diffuse GTO atomic basis set. The calculated electronic properties of the molecule are in very good agreement with state-of-the-art electronic structure calculations. The use of the UKRMol+ suite proved critical since it allowed the use of a large R-matrix sphere (35Bohr), necessary to contain the diffuse electronic states of the molecule. The corresponding calculations using UKRMol are not possible due to numerical problems associated with the combination of GTO-only continuum and a large R-matrix sphere. This work provides the first demonstration of the utility and numerical stability of the new UKRMol+ code. The inelastic cross sections obtained here present a significant improvement over the results of earlier studies on BeH.

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Beryllium release and beryllium transport in the tokamak UNITOR

Cited by 7 publications

References 5 publications

Plasma boundary phenomena in tokamaks

Plasma boundary phenomena in tokamaks

State-to-state electron impact cross sections for BeH⁺molecular ions in ITER-like fusion edge plasmas with Be walls

R-matrix calculations of electron impact electronic excitation of BeH

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Beryllium release and beryllium transport in the tokamak UNITOR

Cited by 7 publications

References 5 publications

Plasma boundary phenomena in tokamaks

Plasma boundary phenomena in tokamaks

State-to-state electron impact cross sections for BeH+molecular ions in ITER-like fusion edge plasmas with Be walls

R-matrix calculations of electron impact electronic excitation of BeH

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Product

Resources

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State-to-state electron impact cross sections for BeH⁺molecular ions in ITER-like fusion edge plasmas with Be walls