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Abstract

The spatial distribution of neutral deuterium has been determined in a reversed field pinch by fluorescence scattering. The first series of measurements, with a resolution of 4 cm were made with the laser tuned to the D-alpha, n = 2 3(6561 ANGSTROEM) transition. The second set of measurements, with both 4 and 2 cm resolution were performed with the laser tuned to the D-beta-n = 2 4(4861 ANGSTROEM) wavelength. The improvement in signal to noise obtained was substantial, being increased by a factor of approximately equal to 2.5 in general. This is believed to be the first such measurement at this wavelength. The advantages of using this transition are such that this technique can be extended to measure the electron density near the plasma edge.

Additional information

Authors: EVANS D A, EURATOM-UKAEA (UK);FORREST M J, EURATOM-UKAEA (UK);NICHOLSON M G, EURATOM-UKAEA (UK);BURGESS D D, EURATOM-UKAEA (UK);CAROLAN P G, EURATOM-UKAEA (UK);GOHIL P EURATOM-UKAEA (UK), EURATOM-UKAEA (UK)
Bibliographic Reference: REV. SCI. INSTRUM., VOL. 56 (1985), NO. 5, PP. 1012- 1014
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