Simultaneous observation of cd and c 2 in the near uv region in the jet divertor
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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
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


Standard cd and c 2 spectroscopy
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


C 2 and cd spectroscopy in the near uv
C2 and CD spectroscopy in the near UV

C2 spectrum

CD spectrum

observed and identified at JET (10/2003)

KT3A outer divertor ch2


Example n 2 seeding
example: N2 seeding

Identification of CN radicals

C2

CN


Example ar seeded plasmas
example: Ar seeded plasmas

strike point on the outer horizontal target plate (14 MW NBI)

without Argon

CD

C2

with Argon

C2

CD


Example ar seeded plasmas1
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


Example high triangular plasmas
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


Conclusion
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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