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Detailed experiments have been carried out in ASDEX-Upgrade to characterize detached plasma conditions in divertor II. This paper presents measurements of the hydrogen emission in the visible and VUV spectral range that distinguishes between the ionization front and the recombing divertor plasma. Plasma parameters in the recombination dominated region were obtained from the Balmer continuum and line emission. By means of the ADAS programme package the rate of volume recombination is evaluated including the effect of opacity. The optical thickness was experimentally determined from the line ratio of L(beta) and H(alpha). In the recombining plasma we have observed an inverse response of H(alpha) light during the spatial broadening of ELMs. Inverse ELMs show signatures of convective transport.

Additional information

Bibliographic Reference: Article: Journal of Nuclear Materials, 266-269 (1999), 1252-1256
Record Number: 199910776 / Last updated on: 1999-05-21
Original language: en
Available languages: en
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