Erosion behavior and surface characterization of beryllium under high-flux deuterium plasma bombardment

Won, J.; Spada, F. E.; Boivin, R. L.; Doerner, R.; Luckhardt, S.; Sze, F. C.; Conn, R.W.

doi:10.1016/s0022-3115(97)80203-6

Cited by 16 publications

(2 citation statements)

References 12 publications

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“…A variety of past studies have examined the chemical interaction of beryllium and carbon and some similarity is to be found with the results of this study. Carbide formation on beryllium substrates is found in plasma exposure [18], plasma deposition [19], and e-beam evaporative deposition [16,17] experiments. It is therefore not surprising, in the present investigation, to find that carbide formation also occurs in the reverse scenario where C substrates, or targets, are exposed to deuterium plasmas with an incident-beryllium flux.…”

Section: Discussionmentioning

confidence: 99%

A time resolved study of the mitigation of graphite chemical erosion in deuterium plasmas containing beryllium

Baldwin¹,

Doerner

2006

Nucl. Fusion

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The interaction of the graphite strike plate material in ITER, with a divertor plasma containing beryllium, is simulated experimentally in PISCES-B. Graphite targets are exposed at 600 K to deuterium plasmas with fixed beryllium fractions ( ) in the range 0.0003 ⩽ fBe ⩽ 0.011. From the onset of beryllium injection, the intensity of plasma CD band optical emission caused by target chemical erosion, diminishes exponentially at a rate found to depend on fBe. The rate of chemical erosion decay, , is found to increase with fBe over the range of beryllium fractions explored and can be described by a simple power law expression, , where α = 785 ± 161 s−1 and β = 2.07 ± 0.10. Evidence of chemical binding between the surface carbon and beryllium is found in XPS analysis of targets following exposure. A reduction in available surface carbon bonds, due to the presence of beryllium, is believed to be responsible for the observed mitigation of chemical erosion.

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Section: Discussionmentioning

confidence: 99%

A time resolved study of the mitigation of graphite chemical erosion in deuterium plasmas containing beryllium

Baldwin¹,

Doerner

2006

Nucl. Fusion

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show abstract

“…Other than these, there are several laboratory studies reported in the literature in which the chemical interaction of beryllium and carbon is examined. Beryllium carbide formation is observed on beryllium substrates exposed to plasma with carbon impurities [20], in plasma-assisted deposition experiments [21], and on beryllium targets in e-beam evaporative deposition [12,13] experiments. It is therefore not too surprising that beryllium carbide is found to occur in the present experiments under the reverse scenario where graphite targets are exposed to plasma with an incident-beryllium flux.…”

Section: Discussionmentioning

confidence: 99%