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Simultaneous observation of CD and C 2 in the near UV region in the JET divertor

Simultaneous observation of CD and C 2 in the near UV region in the JET divertor. spectral window for the observation of CD and C 2 examples a) nitrogen seeding – observation of CN (last week) b) argon seeding – reduction of CD and C 2 light

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Simultaneous observation of CD and C 2 in the near UV region in the JET divertor

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  1. Simultaneous observation of CD and C2in the near UV region in the JET divertor • spectral window for the observation of CD and C2 • examples a) nitrogen seeding – observation of CN (last week) b) argon seeding – reduction of CD and C2 light c) high triangular plasmas – different behaviour of CD and C2 S. Brezinsek, A. Pospieszczyk A. Meigs, M. Stamp

  2. Standard CD and C2 spectroscopy • sources, particle fluxes, chemical erosion yield … • observation of CD at 431 nm (A-X band) • observation of C2 at 517 nm (Swan band) • wide range & low resolution (e.g. KS3) • different devices & l-o-s (e.g. KT3) • good resolution & low time resolution (e.g. KME) often necessary: simultaneous measurement of CD and C2 • good spectral resolution • good spatial resolution and the same l-o-s • good time resolution

  3. C2 and CD spectroscopy in the near UV C2 spectrum CD spectrum observed and identified at JET (10/2003) KT3A outer divertor ch2

  4. example: N2 seeding Identification of CN radicals C2 CN

  5. example: Ar seeded plasmas strike point on the outer horizontal target plate (14 MW NBI) without Argon CD C2 with Argon C2 CD

  6. example: Ar seeded plasmas strike point on the outer horizontal target plate (14 MW NBI) without Argon CD C2 influence of Ar on the local plasma parameters? with Argon CD C2

  7. example: high triangular plasmas strike point on the outer horizontal target plate high power: 14 MW NBI observation along the outer vertical target plate different behaviour of CD and C2

  8. conclusion • spectral region is good for the observation of relative changes of CD and C2 • KT3A system in combination with this spectral range very useful (time / spatial resolution) • only theoretical data for CD (B-X) transition available

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