IMPURITY SOURCES AND IMPURITY INFLUXES IN THE JET TOKAMAK
Spectral lines from hydrogen and low ionization stages of impurities (C, O, Cl, Cr, Ni) have been studied routinely in JET by means of visible spectroscopy. The plasma light, collected along selected chords terminating on the upper torus walls (vertical chords) or on carbon limiters or an RF antenna (horizontal chords), is relayed to spectrometers or narrow band interference filters outside the torus hall by about 100 m long optical fibres. Since the use of fibres restricts the wavelength range to lambda > 380 nm, a close coupled spectrometer is mounted on the torus, viewing a carbon limiter in the extended range down to about 200 nm. Calibrated signals from these instruments are used for determining the local influxes GAMMA of hydrogen and impurities from walls and limiters, and for calculating the integral fluxes phi by multiplying by the respective areas.
Bibliographic Reference: 12TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA PHYSICS, BUDAPEST (HUNGARY), SEPT. 2-6, 1985 PP. 93-96 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK), MENTIONING REPORT JET-P(85)10, 1985
Record Number: 1989124056700 / Last updated on: 1987-01-01
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