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A spectral survey of tungsten emission in the ultraviolet region has beencompleted in the DIII-D tokamak and the CTH torsatron to assess the potentialbenefit of UV emission for the diagnosis of gross W erosion. A total of 29 W Ispectral lines are observed from the two experiments using survey spectrometersbetween 200-400 nm with level identifications provided based on a structurecalculation for many of the excited states that produce strong emission lines.Of the 29 observed lines, 20 have not previously been reported in fusionrelevant plasmas, including an intense line at 265.65 nm which could beimportant for benchmarking the frequently exploited line at 400.88 nm. Nearlyall of the observed spectral lines decay down to one of the six lowest energylevels for neutral W, which are likely to be long-lived metastable states. Theimpact of metastable level populations on the W I emission spectrum and anyerosion measurement utilizing a spectroscopic technique is potentiallysignificant. Nevertheless, the high density of W I emission in the UV regionallows for the possibly of determining the relative metastable fractions andplasma parameters local to the erosion region. Additionally, the lines observedin this work could be used to perform multiple independent gross erosionmeasurements, leading to more accurate diagnosis of gross tungsten erosion.

Advances in neutral tungsten ultraviolet spectroscopy for the potential benefit to gross erosion diagnosis