1. Overview of recent TJ-II stellarator results
- Author
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Ascasibar, Enrique, Alba, D., Alegre Castro, Daniel, Alonso Poza, Alberto, Alonso Gonzalez, Javier, Aragón, F. de, Baciero, Alfonso, Barcala Riveira, Jose Miguel, Blanco, E., Botija, J., Bueno Gallardo, Leticia, Cabrera, S., Cal, E. de la, Calvo, Iván, Cappa, Alvaro, Carralero, D., Carrasco Perea, Raquel, Carreras Verdaguer, Benjamin A., Castejon Mochon, Jose Francisco, Castro, R., Castro, Alfonso de, Catalan, G., Chmyga, A. A., Chamorro, M., Cooper, Wilfred Anthony, Dinklage, Andreas, Eliseev, Leonid, Estrada, Teresa, Ezzat, M., Fernández Marina, F., Fontdecaba Climent, Jose Maria, Garcia Gonzalez, Leandro, Garcia Gonzalo, Luis, Garcia Cortes, Maria Isabel, Garcia Gomez, R., Garcia Regaña, Jose Manuel, Gonzalez Jerez, A., Grenfell, G., Guasp, J., Hernandez Sanchez, J., Hernanz Vila, Julio, Hidalgo, Carlos, Hollmann, Eric Matthias, Jimenez Denche, A., Khabanov, Philipp, Kharchev, N., Kirpitchev, I., Kleiber, R., Kozachek, A. S., Krupnik, L., Lapayese, F., Liniers, M., Liu, B., Lopez Bruna, Daniel, Lopez Fraguas, A., Lopez-Miranda, B, Lopez Razola, J., Losada, U., Luna, Elena de la, Martín de Aguilera, A., Martin-Diaz, F., Martinez Fuentes, M., Martin Gomez, G., Martin Rojo, Ana Belen, Martinez-Fernandez, J., Mccarthy, Kieran Joseph, Medina, F., Medrano, M., Melon, L., Melnikov, A. V., Mendez, P., Merino, R., Miguel, F. J., Van Milligen, Boudewijn, Molinero, A, Momo, Barbara, Monreal, P., Mulas, S., Narushima, Y., Navarro Dongil, Matilde, Ochando, Maria A., Ohshima, Shinsuke, Olivares, J., Oyarzabal, E., Pablos, Jose Luis de, Pacios, L., Panadero, N., Parra, Félix I., Pastor, Ignacio, Peña Gomez, Ángel de la, Pereira, A., Pinzon, J. R., Portas, A. B., Poveda, E., Quintana, J. A., Ramos Lopez, Francisco Javier, Ratta, G. A., Redondo Escudero, Miriam, Rincon, E., Rios, L., Rodriguez Fernandez, C., Rodriguez Rodrigo, L., Rojo, B., Ros, A., Rosa, E., Sanchez Moreno, Esteban, Sanchez Aguilar, Javier, Sanchez Dafauce, Mario, Sanchez Sarabia, E., Satake, S., Sebastian, J. A., Sharma, R., Silva, C., Solano, Emilia R., Soleto, A., Sun, B. J., Tabares, Francisco L., Tafalla, David, Takahashi, H., Tamura, N., Tolkachev, A., Vega, J., Velasco, G., Velasco, Jose Luis, Yamamoto, S., Zurro, B., Ministerio de Economía y Competitividad (España), and TJ Team
- Subjects
Nuclear and High Energy Physics ,Electric fields ,01 natural sciences ,7. Clean energy ,Gyrokinetic simulations ,010305 fluids & plasmas ,law.invention ,symbols.namesake ,Physics::Plasma Physics ,law ,Electric field ,0103 physical sciences ,Langmuir probe ,Perturbation theory ,010306 general physics ,Impurity transport ,Stellarator ,Physics ,Liquid metal plasma facing components ,Turbulence ,Física ,Transport theory ,Condensed Matter Physics ,Quantum electrodynamics ,symbols ,Alfvenic Activity - Abstract
The main results obtained in the TJ-II stellarator in the last two years are reported. The most important topics investigated have been modelling and validation of impurity transport, validation of gyrokinetic simulations, turbulence characterisation, effect of magnetic configuration on transport, fuelling with pellet injection, fast particles and liquid metal plasma facing components. As regards impurity transport research, a number of working lines exploring several recently discovered effects have been developed: the effect of tangential drifts on stellarator neoclassical transport, the impurity flux driven by electric fields tangent to magnetic surfaces and attempts of experimental validation with Doppler reflectometry of the variation of the radial electric field on the flux surface. Concerning gyrokinetic simulations, two validation activities have been performed, the comparison with measurements of zonal flow relaxation in pellet-induced fast transients and the comparison with experimental poloidal variation of fluctuations amplitude. The impact of radial electric fields on turbulence spreading in the edge and scrape-off layer has been also experimentally characterized using a 2D Langmuir probe array. Another remarkable piece of work has been the investigation of the radial propagation of small temperature perturbations using transfer entropy. Research on the physics and modelling of plasma core fuelling with pellet and tracer-encapsulated solid-pellet injection has produced also relevant results. Neutral beam injection driven Alfvénic activity and its possible control by electron cyclotron current drive has been examined as well in TJ-II. Finally, recent results on alternative plasma facing components based on liquid metals are also presented This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under Grant Agreement No. 633053. It has been partially funded by the Ministerio de Ciencia, Inovación y Universidades of Spain under projects ENE2013-48109-P, ENE2015-70142-P and FIS2017-88892-P. It has also received funds from the Spanish Government via mobility grant PRX17/00425. The authors thankfully acknowledge the computer resources at MareNostrum and the technical support provided by the Barcelona S.C. It has been supported as well by The Science and Technology Center in Ukraine (STCU), Project P-507F.
- Published
- 2019
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