A simple method of impurity injection into tokamak plasmas

D. Hildebrandt, J. Bakos, G. Petravich, H. Badalec, K. Jakubka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Injection of test impurities into the edge plasma of tokamak discharges by erosion probes containing these impurities is described. By applying a short bias pulse to the probe inserted into the sol-plasma, the plasma density and temperature at the probe location can be deduced and the time of injection during the discharge can be controlled. By locating the probe at an appropriate position it is possible to release defined quantities of the material and to influence the fraction which penetrates into the core plasma. The injection of Li into hydrogen discharges of the small-sized tokamaks Castor and MT-1 is demonstrated. The nature of the main erosion process (ion sputtering or arcing) has been found to depend on the radial position of the probe and the probe potential. The lithium amount released by sputtering is determined, while in the case of arcing only an estimate can be given. The temporal evolution and the radial penetration of the Li influx into the plasma have been observed by monitoring the neutral emission line using a grating spectrometer and a CCD camera. In addition, Li transported through the plasma was collected on solid samples. An estimate is given on the fraction of the impurity efflux from the core plasma which is collected on the samples.

Original languageEnglish
Pages (from-to)547-551
Number of pages5
JournalReview of Scientific Instruments
Volume60
Issue number4
DOIs
Publication statusPublished - 1989

Fingerprint

Impurities
injection
Plasmas
impurities
probes
erosion
Sputtering
Erosion
sputtering
efflux
Plasma density
plasma temperature
Diffraction gratings
estimates
CCD cameras
Sols
plasma density
Spectrometers
Lithium
penetration

ASJC Scopus subject areas

  • Instrumentation
  • Physics and Astronomy (miscellaneous)

Cite this

A simple method of impurity injection into tokamak plasmas. / Hildebrandt, D.; Bakos, J.; Petravich, G.; Badalec, H.; Jakubka, K.

In: Review of Scientific Instruments, Vol. 60, No. 4, 1989, p. 547-551.

Research output: Contribution to journalArticle

Hildebrandt, D, Bakos, J, Petravich, G, Badalec, H & Jakubka, K 1989, 'A simple method of impurity injection into tokamak plasmas', Review of Scientific Instruments, vol. 60, no. 4, pp. 547-551. https://doi.org/10.1063/1.1140361
Hildebrandt, D. ; Bakos, J. ; Petravich, G. ; Badalec, H. ; Jakubka, K. / A simple method of impurity injection into tokamak plasmas. In: Review of Scientific Instruments. 1989 ; Vol. 60, No. 4. pp. 547-551.
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