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description Publicationkeyboard_double_arrow_right Article , Journal 2019Publisher:Elsevier BV Authors:M.W. Shafer;
B. Covele; J.M. Canik;M.W. Shafer
M.W. Shafer in OpenAIREL. Casali;
+9 AuthorsL. Casali
L. Casali in OpenAIREM.W. Shafer;
B. Covele; J.M. Canik;M.W. Shafer
M.W. Shafer in OpenAIREL. Casali;
H.Y. Guo; A.W. Leonard; J.D. Lore; A.G. McLean; A.L. Moser; P.C. Stangeby; D. Taussig;L. Casali
L. Casali in OpenAIREH.Q. Wang;
J.G. Watkins;H.Q. Wang
H.Q. Wang in OpenAIRELocal neutral pressure measurements in the closed small angle slot (SAS) divertor [1,2] on DIII-D show a large increase when the divertor plasma shifts from high recycling into detachment. In-tile pressure gauges were installed to measure the pressure in the near- and far-SOL regions to examine the predicted high neutral pressures and compression. Cross-field drift effects lead to ∼ 10 × higher peak neutral pressure in detachment with the ion ∇B drift toward the divertor compared to out of the divertor, with similar pressures in attached conditions. Drifts also play a role in the neutral distribution in the slot while attached but become less pronounced in detachment once gradient drives reduce. Variation in the outer strike point location found higher neutral pressure and detachment at modestly lower main-plasma density with the strike point positioned away from the designed operation point. Reducing the fraction of the SOL width allowed into the slot increases neutral leakage into the main chamber and increases the main-plasma density required for detachment. Preliminary modeling with the SOLPS code without drifts over-predicts the neutral pressure in detachment by a factor of 2 with the strike point in the designed operation point while more significantly over-predicts the neutral slot compression; experiments show a broader distribution of neutrals through the slot. These measurements are used to help understand detachment and validate divertor design metrics. Keywords: DIII-D, Divertor, Neutral pressure, Detachment,
Nuclear Materials an... arrow_drop_down Nuclear Materials and EnergyArticle . 2019 . Peer-reviewedLicense: CC BY NC NDData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.nme.2019.04.003&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 29 citations 29 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Nuclear Materials an... arrow_drop_down Nuclear Materials and EnergyArticle . 2019 . Peer-reviewedLicense: CC BY NC NDData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.nme.2019.04.003&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2019Publisher:Elsevier BV SOLPS5.1 modelling of first detachment experiments carried out in the new Small Angle Slot (SAS) divertor recently installed at DIII-D has indicated a significant reduction in Te at the strike point compared to a matched open divertor case for a given separatrix density. The SAS divertor combines a gas-tight slot geometry with a small target angle to bootstrap power and momentum dissipation of recycling neutrals with the goal of achieving simultaneous control of heat flux and erosion at relatively low plasma density required for non-inductive current drive in future steady-state tokamaks. The changes in the neutral ballistics influenced by the combination of closure and small angle target, result in a build-up of the neutral density in the slot, which promotes volumetric losses and facilitates detachment. Variations in the strike point location within the slot reveal a strong dependence of divertor cooling on the strike point location. This is due to the fact that by changing the strike point location, the region where the neutral leakage takes place is varied, thus affecting detachment. The results presented in this paper highlight the importance of controlling the neutral recycling flux to facilitate power dissipation. Keywords: Divertor, Closure, Detachment, Neutrals, SOLPS, DIII-D tokamak
Nuclear Materials an... arrow_drop_down Nuclear Materials and EnergyArticle . 2019 . Peer-reviewedLicense: CC BY NC NDData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.nme.2019.03.021&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 24 citations 24 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Nuclear Materials an... arrow_drop_down Nuclear Materials and EnergyArticle . 2019 . Peer-reviewedLicense: CC BY NC NDData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.nme.2019.03.021&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu