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1. 2018 Status on KIT Gyrotron Activities

Author

Jelonnek John, Aiello G., Avramidis K., Gantenbein G., Grossetti G., Illy S., Ioannidis Z. C., Jin J., Kalaria P., Marek A., Pagonakis I. Gr., Rzesnicki T., Ruess S., Ruess T., Scherer T., Schmid M., Strauss D., Thumm M., Wilde F., Wu C., and Zein A.

Subjects
Physics, QC1-999
Published
2018
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2. Extension of the multi-frequency ECRH system at ASDEX upgrade

Author

Wagner D., Stober J., Kircher M., Leuterer F., Monaco F., Münich M., Schubert M., Zohm H., Gantenbein G., Jelonnek J., Thumm M., Meier A., Scherer T., Strauss D., Kasparek W., Lechte C., Plaum B., Zach A., Litvak A.G., Denisov G.G., Chirkov A., Malygin V., Popov L.G., Nichiporenko V.O., Myasnikov V.E., Tai E.M., Solyanova E.A., and Malygin S.A.

Subjects
Physics, QC1-999
Published
2017
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5. CVD diamond Brewster window: feasibility study by FEM analyses

Author

Vaccaro A., Strauss D., Spaeh P., Schreck S., Scherer T., Meier A., Grossetti G., and Aiello G.

Subjects
Physics, QC1-999
Abstract

Chemical vapor deposition (CVD) diamond windows are a crucial component in heating and current drive (H&CD) applications. In order to minimize the amount of reflected power from the diamond disc, its thickness must match the desired beam wavelength, thus proper targeting of the plasma requires movable beam reflectors. This is the case, for instance, of the ITER electron cyclotron H&CD system. However, looking at DEMO, the higher heat loads and neutron fluxes could make the use of movable parts close to the plasma difficult. The issue might be solved by using gyrotrons able to tune the beam frequency to the desired resonance, but this concept requires transmission windows that work in a given frequency range, such as the Brewster window. It consists of a CVD diamond disc brazed to two copper cuffs at the Brewster angle. The brazing process is carried out at about 800°C and then the temperature is decreased down to room temperature. Diamond and copper have very different thermal expansion coefficients, therefore high stresses build up during the cool down phase that might lead to failure of the disc. Considering also the complex geometry of the window with the skewed position of the disc, analyses are required in the first place to check its feasibility. The cool down phase was simulated by FEM structural analyses for several geometric and constraint configurations of the window. A study of indirect cooling of the window by water was also performed considering a HE11 mode beam. The results are here reported.

Published
2012
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6. European research activities towards a future DEMO gyrotron

Author

Jelonnek, J., primary, Aiello, G., additional, Alberti, S., additional, Avramidis, K., additional, Bertinetti, A., additional, Bruschi, A., additional, Chelis, J., additional, Franke, T., additional, Gantenbein, G., additional, Garavaglia, S., additional, Granucci, G., additional, Grossetti, G., additional, Illy, S., additional, Ioannidis, Z.C., additional, Jin, J., additional, Kalaria, P., additional, Latsas, G.P., additional, Laqua, H., additional, Leggieri, A., additional, Legrand, F., additional, Marek, A., additional, Pagonakis, I.Gr., additional, Peponis, D., additional, Savoldi, L., additional, Rzesnicki, T., additional, Ruess, S., additional, Ruess, T., additional, Scherer, T., additional, Schmid, M., additional, Strauss, D., additional, Tigelis, I., additional, Thumm, M., additional, Tran, M.Q., additional, Wilde, F., additional, Wu, C., additional, Zanino, R., additional, and Zein, A., additional

Published
2017
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7. High power ECRH and ECCD in moderately collisional ASDEX Upgrade Hmodes and status of EC system upgrade

Author

Stober, J., primary, Sommer, F., additional, Angioni, C., additional, Bock, A., additional, Fable, E., additional, Leuterer, F., additional, Monaco, F., additional, Müller, F., additional, Münich, S., additional, Petzold, B., additional, Poli, E., additional, Schubert, M., additional, Schütz, H., additional, Wagner, D., additional, Zohm, H., additional, Kasparek, W., additional, Plaum, B., additional, Meier, A., additional, Scherer, Th., additional, Strauß, D., additional, Jelonnek, J., additional, Thumm, M., additional, Litvak, A., additional, Denisov, G.G., additional, Chirkov, A.V., additional, Tai, E.M., additional, Popov, L.G., additional, Nichiporenko, V.O., additional, Myasnikov, V.E., additional, Soluyanova, E.A., additional, and Malygin, V., additional

Published
2015
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8. Status of Europe’s contribution to the ITER EC system

Author

Albajar, F., primary, Aiello, G., additional, Alberti, S., additional, Arnold, F., additional, Avramidis, K., additional, Bader, M., additional, Batista, R., additional, Bertizzolo, R., additional, Bonicelli, T., additional, Braunmueller, F., additional, Brescan, C., additional, Bruschi, A., additional, von Burg, B., additional, Camino, K., additional, Carannante, G., additional, Casarin, V., additional, Castillo, A., additional, Cauvard, F., additional, Cavalieri, C., additional, Cavinato, M., additional, Chavan, R., additional, Chelis, J., additional, Cismondi, F., additional, Combescure, D., additional, Darbos, C., additional, Farina, D., additional, Fasel, D., additional, Figini, L., additional, Gagliardi, M., additional, Gandini, F., additional, Gantenbein, G., additional, Gassmann, T., additional, Gessner, R., additional, Goodman, T.P., additional, Gracia, V., additional, Grossetti, G., additional, Heemskerk, C., additional, Henderson, M., additional, Hermann, V., additional, Hogge, J.P., additional, Illy, S., additional, Ioannidis, Z., additional, Jelonnek, J., additional, Jin, J., additional, Kasparek, W., additional, Koning, J., additional, Krause, A.S., additional, Landis, J.D., additional, Latsas, G., additional, Li, F., additional, Mazzocchi, F., additional, Meier, A., additional, Moro, A., additional, Nousiainen, R., additional, Purohit, D., additional, Nowak, S., additional, Omori, T., additional, van Oosterhout, J., additional, Pacheco, J., additional, Pagonakis, I., additional, Platania, P., additional, Poli, E., additional, Preis, A.K., additional, Ronden, D., additional, Rozier, Y., additional, Rzesnicki, T., additional, Saibene, G., additional, Sanchez, F., additional, Sartori, F., additional, Sauter, O., additional, Scherer, T., additional, Schlatter, C., additional, Schreck, S., additional, Serikov, A., additional, Siravo, U., additional, Sozzi, C., additional, Spaeh, P., additional, Spichiger, A., additional, Strauss, D., additional, Takahashi, K., additional, Thumm, M., additional, Tigelis, I., additional, Vaccaro, A., additional, Vomvoridis, J., additional, Tran, M.Q., additional, and Weinhorst, B., additional

Published
2015
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9. High power ECRH and ECCD in moderately collisional ASDEX U-pgrade Hmodes and status of EC system upgrade.

Author

Stober, J., Sommer, F., Angioni, C., Bock, A., Fable, E., Leuterer, F., Monaco, F., Müller, F., Münich, S., Petzold, B., Poli, E., Schubert, M., Schütz, H., Wagner, D., Zohm, H., Kasparek, W., Plaum, B., Meier, A., Scherer, Th., and Strauß, D.

Subjects
HEAT exchangers, ELECTRON research, IONS, COLLISIONS (Nuclear physics), TOKAMAKS
Abstract

This contribution deals with H-modes with significant heat exchange between electrons and ions, but which can still show large differences between electron and ion-temperatures especially inside half minor radius. These conditions are referred to as moderately collisional. A systematic study shows that an increasing fraction of electron heating increases the transport in the ion channel mainly due to the dependence of the ITG dominated ion transport on the ratio Te/Ti in agreement with modeling. The rotational shear in the plasmas under study was so small that it hardly influences ITG stability, such that variations of the rotation profile due to a change of the heating method were of minor importance. These findings connect to studies of advanced tokamak scenarios using ECCD as a tool to modify the q-profile. The electron heating connected to the ECCD tends to increase the transport in the ion channel quite in contrast to the goal to operate at reduced current but with increased confinement. The confinement only increases as the fraction of ion heating is increased by adding more NBI. An ITER case was modeled as well. Due to the larger value of vei ⋅ τE the ratio Te/Ti is only moderately reduced even with strong electron heating and the confinement reduction is small even for the hypothetic case of using only ECRH as additional heating. Finally the paper discusses the ongoing upgrade of the AUG ECRH-system. [ABSTRACT FROM AUTHOR]

Published
2015
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