Alumina-plasma interaction in the PETULA Tokamak
Description
In connection with the construction of an alumina vacuum vessel on the PETULA Tokamak, measurements of the outgassing properties of alumina and studies of alumina-plasma interaction have been undertaken. Outgassing rates of 10-11 to 10-12 Torr l/scm2 are achieved for baking temperature ranging between 1500 and 2000 C. Two categories of results have been obtained from the studies of alumina-plasma interaction depending on the plasma interacting with the alumina. For dense and cold plasma 1013e/cm3 a few eV, impurity concentrations lower than 1% are measured -ELISA experiment. For dense and hot plasmas, comparison between discharges produced with tungsten and alumina limiters shows an improvement of plasma characteristics in the case of alumina: ohmic power and oxygen contamination are significantly reduced
Availability note (English)
Copies available from Service de Documentation, CEN Saclay, BP No 2, 91190 Gif-sur-Yvette (France).Abstract (French)
En vue de la construction de la chambre a vide en alumine de PETULA, on a mesure les proprietes de degazage de l'alumine et etudie l'interaction d'un plasma avec ce materiau. Des taux de degazage de 10-11 a 10-12 Torr l/scm2 ont ete atteints apres etuvage a 150-200 deg C. Les interactions alumine plasma ont ete etudiees de deux manieres differentes. Dans un cas -experience ELISA- on a montre qu'avec des plasmas denses (1013e/cm3) et froids (quelques eV), la densite d'impurete etait inferieure a 1%. Pour des plasmas denses et chauds, la comparaison entre des decharges tokamaks obtenues avec des diaphragmes en tungstene ou en alumine, a montre que les caracteristiques du plasma sont meilleures dans le cas de l'alumine: les pertes et la contamination par l'oxygene sont plus faiblesAdditional details
Additional titles
- Original title (French)
- Interaction alumine-plasma dans le Tokamak PETULA
Publishing Information
- Imprint Pagination
- 19 p.
- Report number
- CEA-CONF--3860
Conference
- Title
- National congress on plasma physics.
- Dates
- 6 - 10 Dec 1976.
- Place
- Paris, France.
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 8338966
- Subject category
- S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Resource subtype / Literary indicator
- Conference, Non-conventional Literature
- Descriptors DEI
- ALUMINIUM OXIDES; COLD PLASMA; HOT PLASMA; IMPURITIES; PETULA TOKAMAK; VACUUM SYSTEMS
- Descriptors DEC
- ALUMINIUM COMPOUNDS; CHALCOGENIDES; CLOSED PLASMA DEVICES; OXIDES; OXYGEN COMPOUNDS; PLASMA; THERMONUCLEAR DEVICES; TOKAMAK DEVICES