Enhancement of the sputtering yield of pyrolytic graphite at elevated temperatures

Philipps, V.; Flaskamp, K.; Vietzke, E.

doi:10.1016/0022-3115(82)90305-1

Cited by 78 publications

(15 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 11(a) shows the measured temperature dependence of C reemission from a pure C surface [40]. Although there is much scatter in the data, one observes an approximately constant C reemission over the temperature range 300-1200 K, confirming previously published findings that RES is negligible at temperatures below 1200 K [41,42]. For temperatures above ≈1200 K, the C reemission increases steeply with increasing temperature as expected for RES.…”

Section: Radiation-enhanced Sublimation From Mixed W-c Surfacessupporting

confidence: 84%

An overview of sputtering-related processes occurring at mixed surfaces formed by simultaneous C+ and D+ irradiation of W

Bizyukov

Krieger

Lee

et al. 2012

Journal of Nuclear Materials

View full text Add to dashboard Cite

This paper reviews the interaction of carbon and deuterium ions with tungsten leading to the formation of mixed W-C-D surfaces. This projectile-target system is prone to synergistic effects, which are dependent on the presence of both projectile species. The erosion of the surface is governed by both kinematic effects and effects related to elevated surface temperature. It is found that the kinematics can be well described by available models of ionsurface interactions based on binary-collision approximations. The temperature-dependent processes include: chemical erosion, diffusion, erosion at elevated temperatures and radiation-enhanced sublimation. The effects of these processes, in particular their influence on the carbon content of the mixed W-C surface, have been studied experimentally. These experimental results and their implications for fusion applications are discussed here.2

show abstract

Section: Radiation-enhanced Sublimation From Mixed W-c Surfacessupporting

confidence: 84%

An overview of sputtering-related processes occurring at mixed surfaces formed by simultaneous C+ and D+ irradiation of W

Bizyukov

Krieger

Lee

et al. 2012

Journal of Nuclear Materials

View full text Add to dashboard Cite

show abstract

“…Another erosion process, unique for carbon -radiation-enhanced sublimation (RES) -has been observed in ion-beam experiments [314,315]. RES results in the release of carbon atoms with a thermal velocity distribution [316] under ion irradiation.…”

Section: Radiation-enhanced Sublimation (Res)mentioning

confidence: 99%

Plasma-material interactions in current tokamaks and their implications for next step fusion reactors

et al. 2001

View full text Add to dashboard Cite

The major increase in discharge duration and plasma energy in a next step DT fusion reactor will give rise to important plasma-material effects that will critically influence its operation, safety and performance. Erosion will increase to a scale of several centimetres from being barely measurable at a micron scale in today's tokamaks. Tritium co-deposited with carbon will strongly affect the operation of machines with carbon plasma facing components. Controlling plasma-wall interactions is critical to achieving high performance in present day tokamaks, and this is likely to continue to be the case in the approach to practical fusion reactors. Recognition of the important consequences of these phenomena stimulated an internationally co-ordinated effort in the field of plasma-surface interactions supporting the Engineering Design Activities of the International Thermonuclear Experimental Reactor project (ITER), and significant progress has been made in better understanding these issues. The paper reviews the underlying physical processes and the existing experimental database of plasma-material interactions both in tokamaks and laboratory simulation facilities for conditions of direct relevance to next step fusion reactors. Two main topical groups of interaction are considered: (i) erosion/redeposition from plasma sputtering and disruptions, including dust and flake generation and (ii) tritium retention and removal. The use of modelling tools to interpret the experimental results and make projections for conditions expected in future devices is explained. Outstanding technical issues and specific recommendations on potential R&D avenues for their resolution are presented.

show abstract

“…Carbon diffusion resulted in changes to the implanted C depth profiles at K T 900 > [4] resulting in increased W sputtering by reducing the rate of C surface buildup. In addition, enhanced sputtering yield of carbon with increasing temperature occurs for all ions [5,6,7] due to weakly bound or sublimation of carbon interstitials formed during irradiation [6,8]. Such enhanced C sputtering with increasing temperature plays an important role in determining the surface C concentration in tungsten irradiated by carbon.…”

Section: Introductionmentioning

confidence: 99%

Modeling tungsten and carbon sputtering by carbon at elevated temperatures

Lee

Krieger

2009

Phys. Scr.

View full text Add to dashboard Cite

Abstract. The planned use of carbon strike plates adjacent to tungsten tiles in the ITER divertor will lead to W erosion by sputtered C ions. The W sputtering yield by C decreases with increasing surface concentration of the implanted C. However with increasing temperature, the C self-sputtering yield increases, reducing the rate of C surface coverage. This study attempts to model the temperature dependent C self-sputtering process and its impact on W erosion by using modified surface binding energies (SBEs) in TRIDYN. The SBEs are benchmarked against C self-sputtering yields measured in this study and W irradiation by C is simulated and compared to previous experimental results. Good agreement between simulation and experiments is seen at 670 K, while small deviations are observed at 770 K due to surface roughening. At 870 K, significant deviation is observed which can be attributed to enhanced surface roughening as well as diffusion effects.

show abstract

Enhancement of the sputtering yield of pyrolytic graphite at elevated temperatures

Cited by 78 publications

References 4 publications

An overview of sputtering-related processes occurring at mixed surfaces formed by simultaneous C+ and D+ irradiation of W

An overview of sputtering-related processes occurring at mixed surfaces formed by simultaneous C+ and D+ irradiation of W

Plasma-material interactions in current tokamaks and their implications for next step fusion reactors

Modeling tungsten and carbon sputtering by carbon at elevated temperatures

Contact Info

Product

Resources

About