Plasma-wall interactions in the TFR machine

Rebut, P.H.; Dei-Cas, R.; Ginot, Patrick; Girard, J.P.; Huguet, M.; Lecoustey, P.; Moriette, P.; Sledziewski, Z.; Tachon, J.; Torossian, A.

doi:10.1016/0022-3115(74)90214-1

Cited by 13 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Runaways occur in the startup phase of a discharge, during disruptions or in low density discharges. The electrons in these discharges reach energies of up to several tens of MeV [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] and their number is so large that they can substantially damage or activate the limiters or wall components [16][17][18][19]. For these reasons, discharges leading to intense runaway electron beams are avoided in tokamak operation, and systematic studies of runaway discharges are generally not possible.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Observation of infrared synchrotron radiation from tokamak runaway electrons in TEXTOR

et al. 1990

View full text Add to dashboard Cite

During runaway discharges in TEXTOR, intense infrared (IR) radiation is-emitted in the electron flow direction. This can only be explained by synchrotron radiation of fast electrons. The observed spectral dependence is consistent with electrons of 25-30 MeV energy; the intensity corresponds to about 1016 electrons or to an electrical current of 40 kA. From the spatial structure of the observed IR pattern, new insight into the spatial distribution of the runaway electrons and their perpendicular momentum can be gained. The runaway electrons populate a torus with a diameter of 0.5-0.6 m, which is slightly larger than the plasma radius; the perpendicular momentum is determined from the vertical extent of the IR pattern and amounts to about 5 m0c. The transformation rate of electrons to runaways can be estimated from the time delay of the IR signal as 2 × 10−4 s−1; this agrees with theoretical expectations derived from the ratio of the electrical field strength to the critical field strength. In TEXTOR, runaways are confined up to energies of 50 MeV, which is just below the limit where a phase should exist in which runaways radiate as much energy as they gain per turn.

show abstract

Section: Introductionmentioning

confidence: 99%

“…In the ST tokamak [7], energies of up to 2.5 MeV were recorded. In PULSATOR [8] and ORMAC [9] the energy of the relativistic electrons was below 5 MeV, while in TFR [10,11] the energy limit was found to be 50 MeV. Energies in excess of 60 MeV have been reported from JET [2,3] and energies of the order of 70 MeV from TORE SUPRA [4,20].…”

Section: Introductionmentioning

confidence: 99%

Observation of infrared synchrotron radiation from tokamak runaway electrons in TEXTOR

et al. 1990

View full text Add to dashboard Cite

show abstract

“…[6]. A partir des variations de tension par tour, on a évalué que 10 à 40 p. cent du courant étaient transportés par les électrons découplés dans ce type de décharge.…”

Section: Mesures Effectuées En L'absence De Protection Bioloyique Penunclassified

“…La figure 13 c est une décharge riche en électrons découplés, sans injection de neutres; le flux de neutrons suit le flux de rayons X durs. 6.2. D is t r ib u t io n spa tia le des do ses associées aux n e u t r o n s Les figures 14 représentent les résultats de l'exposition à 55 décharges de films dosimètres PS1-NR, placés autour du tore à 3 niveaux.…”

Section: é V O L U T Io N T E M P O R E L L Eunclassified

Radioprotection autour d’un appareil de recherches sur la fusion contrôlée : le Tokomak de Fontenay-aux-Roses T.F.R.

T.F.R.¹

1977

Radioprotection

View full text Add to dashboard Cite

“…Investigations have just been started [2] to [5]. On the other hand also the knowledge of the atomic data of the different interaction processes at the first wall is only poor [16] to [18].…”

Section: Introduction -An Understanding and Controlmentioning

confidence: 99%

Boundary Conditions for a Fusion Plasma

Behrisch¹

1977

J. Phys. Colloques

View full text Add to dashboard Cite

The boundary conditions in today's plasma experiments and in later fusion plasmas are determined by the interactions of the plasma with the first solid wall. In today's experiments desorption by the plasma hitting the wall dominates, but ion backscattering, trapping and release, as well as sputtering of wall material, will dominate in machines with cleaner walls. The fluxes to the first wall for some of today's plasma experiments are reported and the data about the elementary processes at the first wall are shortly reviewed

show abstract

Plasma-wall interactions in the TFR machine

Cited by 13 publications

References 0 publications

Observation of infrared synchrotron radiation from tokamak runaway electrons in TEXTOR

Observation of infrared synchrotron radiation from tokamak runaway electrons in TEXTOR

Radioprotection autour d’un appareil de recherches sur la fusion contrôlée : le Tokomak de Fontenay-aux-Roses T.F.R.

Boundary Conditions for a Fusion Plasma

Contact Info

Product

Resources

About