The temperature dependence of deuterium trapping in fusion reactor materials

Wilson, Kenneth L.; Pontau, A.E.

doi:10.1016/0022-3115(79)90390-8

Cited by 28 publications

(12 citation statements)

References 17 publications

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“…The typical ion beam spot was circular with a diameter of $5 mm. The typical ion beam current for the 3 He beam was $1.7 lA for 3 He ++ (0.086 A/m 2 ). Table 1 lists the beam specifications for each exposure condition utilized in this paper.…”

Section: Methodsmentioning

confidence: 99%

“…1). In these experiments a 3.5 MeV 3 He ++ beam was used to monitor the D content of the targets with nuclear reaction analysis (NRA) exploiting the 3 He(d,p)a nuclear reaction. Further details on the DIONISOS experiment can be found elsewhere [8].…”

Section: Methodsmentioning

confidence: 99%

“…This makes the common method of achieving depth profiles, obtaining energy spectra for several 3 gies [9], unfeasible due to time required to vary the beam energy and collect the data.…”

Section: Methodsmentioning

confidence: 99%

“…It is expected that the hydrogenic retention in Mo will be low. Laboratory results for hydrogenic retention in Mo [1][2][3][4][5] show a low rate of retention when Mo is exposed to H or D ions. However the hydrogenic retention for Mo in a tokamak environment is not well documented.…”

Section: Introductionmentioning

confidence: 94%

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Measurement of hydrogenic retention and release in molybdenum with the DIONISOS experiment

Wright

Whyte

Lipschultz

2009

Journal of Nuclear Materials

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…This makes the common method of achieving depth profiles, obtaining energy spectra for several 3 gies [9], unfeasible due to time required to vary the beam energy and collect the data.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

See 2 more Smart Citations

Measurement of hydrogenic retention and release in molybdenum with the DIONISOS experiment

Wright

Whyte

Lipschultz

2009

Journal of Nuclear Materials

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“…The experiment most closely recreating a tokamak plasma environment was performed by Causey et al [46], where Mo was exposed to a Penning deuterium discharge resulting in a high flux of 600 eV D+ ions. These experiments were conducted at elevated temperatures (573-773 K) but were shown to somewhat agree with lower temperature measurements made by Wilson on TZM, a Mo alloy [46,51]. The…”

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confidence: 82%

Dynamics of Plasma-Surface Interactions using In-situ Ion Beam Analysis

Whyte¹

2009

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SummaryThe overall goal of this proposal was to develop an innovative experimental facility that would allow for the measurement of real-time response of a material surface to plasma bombardment by employing in-situ high-energy ion beam analysis. This facility was successfully developed and deployed at U. Wisconsin-Madison and was named DIONISOS (Dynamics of IONic Implantation & Sputtering on Surfaces).There were several major highlights to the DIONISOS research which we will briefly highlight below. The full technical details of the DIONISOS development, deployment and research results are contained in the Appendices which contain several peer-reviewed publications and a PhD thesis devoted to DIONISOS. The DIONISOS results on deuterium retention in molybdenum were chosen as an invited talk at the 2008 International Conference on Plasma-Surface Interactions in Toledo, Spain. Design HighlightsThe DIONISOS design activity was significant. For the first time ever, a high power magnetized plasma environment was combine with high-energy ion beams from an accelerator. This posed several unique challenges that were overcome in the first 1.5 years of design and implementation.1. The 1.7 MV tandem ion accelerator was refurbished and commissioned. The accelerator was re-assembled and installed at UW-Madison after being shipped from Bell Labs in New Jersey, from where it was purchased 2. A dedicated plasma exposure chamber was designed which featured several innovations ( Fig. 1 5. Innovative charged-particle detectors for ion beam analysis that included active cooling and particle shielding from the nearby plasma. This allowed in-situ surface analysis when the plasma was bombarding the target samples.6. Remotely controlled beam-steering and rastering across the sample face using upstream electrostatic deflectors and strong differential pumping.7. Plasma diagnostics including a scanning langmuir probe and infrared thermography of the target.In summary, the design was successful at integrating a high flux plasma exposure chamber with real-time in-situ ion beam surface analysis for the first time. Fig. 2 Photos of the DIONISOS target chamber a) Rotatable target assembly with active heating/cooling and electrical biasing. Overlays shows how the ~mm diameter ion beam can be scanned across the plasma profile. B) Deuterium helicon plasma incident on a molybdenum target. Research HighlightsThe latter half of the research grant activity focused on deuterium fuel retention in refractory metals. In future burning plasma devices like ITER, tritium fuel retention is a serious safety concern; and tritium fuel economy is a concern for eventual fusion reactors breeding their own tritium. At the same time, refractory metals such as molybdenum and tungsten are leading candidates as PFC materials because of their erosion resistance. We used the unique scientific measurement tools of DIONISOS to explore the dynamic interaction of a deuterium plasma with the metals to illuminate fundamental process of importance. Further motivation was provid...

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