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AbstractAbstract

[en] Puri (1999) in a private communication has pointed out a simple but serious oversight in the final result of the above paper (Varma 1998). A factor of ε has through an oversight been left out in going from equation (48) to equation (49) of the above paper (referred to as I hereafter), so that the correct result should read < V

_{r}>=-8/9ε^{1/2}(1-ε^{1/2})^{-1}V_{Ware}rather than that given by equation (49) of I. Equation (1) thus gives a value of < Vr> smaller by a factor of ε, which is rather small for small values of ε. However, for larger values of ε, such as ε=0.26 for ASDEX and ε=0.42 for JET, the value of < Vr> turns out to be 1.04V_{Ware}and 1.84V_{Ware'}, but not as anomalously large as ∼4V_{Ware}. The question arises as to whether the expression for φ(r,θ) obtained in equation (46) of I which is used in equation (48) is valid for larger values of ε such as ε approx. 0.42. The derivation needs to be re-examined in the light of the above. First of all, it turns out that the result in equation (8) is exact, since without expanding in powers of ε,δV/δθ=0, gives: 0=_{δθ}/^{δV}=(ε sin θ)μB_{0}(1+εcosθ)^{-1}- q_{B0}/^{rB}_{0}^{E}_{0}(1+ε cos θ)^{-2}which yields as an exact result sin θ=_{μB0}/^{qR}_{0}^{E}_{0}. This happens to be the same as given by equation (8) of I. All subsequent results up to equation (14) of I are exact. A complete re-examination will be reported later. This note is simply meant to report the correction pointed out above. The author is grateful to Dr S Puri for pointing out the above error. (author)Primary Subject

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Journal Article

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Plasma Physics and Controlled Fusion (Online); ISSN 1361-6587; ; v. 41(8); p. 1053

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AbstractAbstract

[en] The book 'Tokamaks' (ISBN 0-19-856293-4X), edited by John Wesson, was published by Oxford University Press in 1997

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Journal Article

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Plasma Physics and Controlled Fusion (Online); ISSN 1361-6587; ; v. 40(10); p. vp

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Laporta, V.; Chakrabarti, K.; Celiberto, R.; Janev, R. K.; Mezei, J. Zs.; Niyonzima, S.; Tennyson, J.; Schneider, I.F., E-mail: vincenzo.laporta@nanotec.cnr.it

Funding organisation: Distretto Tecnologico Aerospaziale (PON 03PE-00067.6), Brindisi (Italy)2017

Funding organisation: Distretto Tecnologico Aerospaziale (PON 03PE-00067.6), Brindisi (Italy)2017

AbstractAbstract

[en] A theoretical study of resonant vibrational excitation, dissociative recombination and dissociative excitation processes of the beryllium monohydride cation, BeH"+ , induced by electron impact, is reported. Full sets of ro-vibrationally-resolved cross sections and of the corresponding Maxwellian rate coefficients are presented for the three processes. Particular emphasis is given to the high-energy behaviour. Potential curves of "2σ"+, "2σ and "2δ symmetries and the corresponding resonance widths, obtained from R-matrix calculations, provide the input for calculations which use a local complex-potential model for resonant collisions in each of the three symmetries. Rotational motion of nuclei and isotopic effects are also discussed. The relevant results are compared with those obtained using a multichannel quantum defect theory method. Full results are available from the Phys4Entry database.

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Source

Available from: https://doi.org/10.1088/1361-6587/aa5c56; 36 refs., 11 figs., 3 tabs; Country of input: Burundi

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Journal Article

Literature Type

Numerical Data

Journal

Plasma Physics and Controlled Fusion (Online); ISSN 1361-6587; ; v. 59; 10 p

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AbstractAbstract

[en] The following omissions and misprints occurred in this paper: Page B109: the phrase following equation (6) should read 'where h(R) is the specific angular momentum, Vh is .... Page B109: the gravitational constant G should be inserted in equation (10). Page B111: the quantity 'Vr' preceding equation (17) should be replaced by 'Va'. Page B111: the left-hand side of equation (17) should be replaced by V

_{R}=V_{a}-D_{p}(1)/σ_{m}(dσ_{m})/dR and on page B111: In the text following equation (17), 'equation (9)' should be replaced by 'equation (11)'. (author)Primary Subject

Source

Country of input: International Atomic Energy Agency (IAEA); This record replaces 31048856

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Journal Article

Journal

Plasma Physics and Controlled Fusion (Online); ISSN 1361-6587; ; v. 39(12); p. 2067

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AbstractAbstract

[en] The received date for this paper was misquoted. It should have read 'Received 17 March 1999, in final form 7 June 1999'. (author)

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Journal Article

Journal

Plasma Physics and Controlled Fusion (Online); ISSN 1361-6587; ; v. 41(11); p. 1429

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AbstractAbstract

[en] A visible endoscope system and an infrared camera system have been used to study the flux of carbon from an inertially-cooled graphite limiter in Tore Supra. From the variation in the carbon flux with plasma parameters, new data have been obtained, describing the dependence of radiation enhanced sublimation (RES) and chemical sputtering on incident ion flux. Other characteristics of RES under plasma operation conditions have also been studied. The dependence of RES on incident deuterium particle flux density is found to be in reasonable agreement with the expected particle flux scaling over a range of particle fluxes varying by a factor of ∼25, extending the present scaling to higher flux density values. Chemical sputtering has been observed, but only in regions of the limiter with low incident deuterium fluxes. Values inferred for the chemical sputtering yield are similar to those measured with a temperature-controlled test limiter in Textor. (author)

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Journal Article

Journal

Plasma Physics and Controlled Fusion (Online); ISSN 1361-6587; ; v. 40(7); p. 1335-1348

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AbstractAbstract

[en] It is found that the Mercier criterion can be violated in a reversed shear plasma of a tokamak. A reversed shear plasma has negative magnetic shear and negative pressure gradient in the inner region of a plasma. In the negative shear region, stabilizing terms due to the parallel current and the magnetic well produced by the poloidal current change to destabilizing ones. As (q

_{0}-q_{min})/q_{min}increases, the destabilizing effects increase and the Mercier criterion can be violated. Here, q_{0}and q_{min}are the safety factor on the plasma axis and the minimum value along the minor radius, respectively. In JT-60U reversed shear plasmas, the value of (q_{0}-q_{min})/q_{min}becomes large. The violation of the Mercier criterion seems to be consistent with the observation of magnetohydrodynamic activity localized near the internal transport barrier. (author). Letter-to-the-editorPrimary Subject

Source

A corrigendum for this article has been published in 1999 Plasma Phys. Control. Fusion v. 41 p. 1429

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Journal Article

Journal

Plasma Physics and Controlled Fusion (Online); ISSN 1361-6587; ; v. 40(6); p. 871-877

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AbstractAbstract

[en] A general equation for the radial current due to the ion-neutral friction and neoclassical viscosity is given. The equation models the effect of a possible poloidal non-uniformity of the neutral friction, and is valid in an arbitrary toroidally symmetric geometry. A strong dependence on the poloidal distribution of the neutral friction is found. With the help of Monte Carlo simulations the neutral friction in ASDEX Upgrade has been calculated. A large poloidal asymmetry in the neutral density exists, and for the studied shot the neutral friction in the edge is not large enough to compete with the neoclassical viscosity. (author)

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Source

6. IAEA technical committee meeting on H-mode physics; Kloster Seeon (Germany); 22-24 Sep 1997

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Journal Article

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Conference

Journal

Plasma Physics and Controlled Fusion (Online); ISSN 1361-6587; ; v. 40(5); p. 703-706

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AbstractAbstract

[en] The JT-60U divertor geometry was recently modified to a W-shaped structure in order to reduce the back flow of neutrals from the divertor. The H-mode threshold power decreased subtly compared with the open divertor case. As regards density dependence, the exponent of density was 0.5 to 0.75. In addition, we found that the outflux from the outer baffle plate should be considered for the evaluation of neutrals. (author)

Primary Subject

Source

6. IAEA technical committee meeting on H-mode physics; Kloster Seeon (Germany); 22-24 Sep 1997

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Journal Article

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Conference

Journal

Plasma Physics and Controlled Fusion (Online); ISSN 1361-6587; ; v. 40(5); p. 713-716

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AbstractAbstract

[en] The physics of the formation and termination of high ion temperature mode (high T

_{i}mode) is studied by controlling density profiles and radial electric field. High ion temperature mode is observed for neutral beam heated plasmas in heliotron/torsatron plasmas (Heliotron-E). This high T_{i}mode plasma is characterized by a peaked ion temperature profile and is associated with a peaked electron density profile produced by neutral beam fuelling with low wall recycling. This high T_{i}mode is terminated by flattening of the electron density caused either by gas puffing or by second-harmonic ECH (core density 'pump out'). (author)Primary Subject

Source

6. IAEA technical committee meeting on H-mode physics; Kloster Seeon (Germany); 22-24 Sep 1997

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Journal Article

Literature Type

Conference

Journal

Plasma Physics and Controlled Fusion (Online); ISSN 1361-6587; ; v. 40(5); p. 793-797

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