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Your search keyword '"Noke, F."' showing total 17 results
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17 results on '"Noke, F."'

1. Status of Resonant Diplexer Development for high-power ECRH Applications.

Author

Kasparek, W., Plaum, B., Lechte, C., Filipovic, E., Erckmann, V., Grünwald, G., Hollmann, F., Maraschek, M., Michel, G., Monaco, F., Müller, S., Noke, F., Purps, F., Schubert, M., Schütz, H., Stober, J., Wagner, D., Van den Braber, R., Doelman, N., and Fritz, E.

Subjects
RESONATORS, ELECTRON cyclotron resonance sources, CYCLOTRONS, PLASMA gases, POWER electronics
Abstract

Characteristics of ring resonator diplexers for high-power ECRH are briefly reviewed. Commissioning experiments performed on ASDEX Upgrade with the diplexer Mk IIa are presented, which demonstrate slow and fast switching of the power between two launchers, and thus the capability for efficient suppression of neoclassical tearing modes and simultaneous central heating of the plasma. The development of the compact diplexer Mk IIIb is discussed, and test results are presented. Finally, an evacuated design for 170 GHz is shown. [ABSTRACT FROM AUTHOR]

Published
2012
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2. Controlled Mirror Motion System for Resonant Diplexers in ECRH Applications.

Author

Doelman, N., Van Den Braber, R., Kasparek, W., Erckmann, V., Bongers, W., Krijger, B., Stober, J., Fritz, E., Dekker, B., Klop, W., Hollmann, F., Michel, G., Noke, F., Purps, F., de Baar, M., Maraschek, M., Monaco, F., Müller, S., Schütz, H., and Wagner, D.

Subjects
ELECTRON cyclotron resonance sources, ELECTRIC waves, RESONATORS, MOTION, CYCLOTRONS
Abstract

High-power resonant diplexers for millimetre waves have various promising applications in ECRH systems. The round-trip resonator length of a diplexer needs to be accurately tuned to match its prescribed functionality. For this purpose one of the mirrors in the FADIS MkIIa diplexer has been mounted on a motion system, in order to control the mirror to its desired location despite the presence of substantial disturbances. The mechanical properties and control strategy for the mirror motion system have been designed such as to meet the overall system requirements. The performance of the motion system has been experimentally validated in various high power mm-wave tests. [ABSTRACT FROM AUTHOR]

Published
2012
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3. DEVELOPMENT OF COMPACT RESONANT DIPLEXERS FOR ECRH: DESIGN, RECENT RESULTS, AND PLANS.

Author

KASPAREK, W., PLAUM, B., BRAND, P., LECHTE, C., SALIBA, M., WANG, Y., ERCKMANN, V., HOLLMANN, F., MICHEL, G., NOKE, F., PURPS, F., STOBER, J., WAGNER, D., PETELIN, M., KOPOSOVA, E., LUBYAKO, L., DOELMAN, N., VAN DEN BRABER, R., BRUSCHI, A., and BONGERS, W.

Subjects
ELECTRON cyclotron resonance heating, GYROTRONS, ELECTRON emission, INSERTION loss measurement, PLASMA waveguides
Published
2011

4. Concurrent operation of 10 gyrotrons at W7-X - experience and improvement opportunities.

Author

Braune, H., Brunner, K. J., Laqua, H. P., Marsen, S., Moseev, D., Noke, F., Purps, F., Schneider, N., Schulz, T., Stange, T., Uhren, P., and Wilde, F.

Subjects
ELECTRON cyclotron resonance heating, GYROTRONS, STELLARATORS, PLASMA confinement, CURRENT-drive heating
Abstract

At the stellarator Wendelstein 7-X (W7-X) Electron Cyclotron Resonance Heating (ECRH) is the main heating system for steady-state operation and was the only available heating system during the operation phase OP1.2a in 2017. The ECRH, equipped with 10 operational 140 GHz gyrotrons [1], was used for different tasks at W7-X such as wall conditioning, controlled plasma start-up from the neutral gas up to steady state plasma control and different heating scenarios such as X2-mode and O2-mode heating as well as current drive (ECCD). The operational experiences and improvement opportunities of the ECRH plant will be discussed. [ABSTRACT FROM AUTHOR]

Published
2018
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7. Progress on 140 GHz, 1 MW, CW series gyrotrons for W7-X.

Author

Jelonnek, J., Braune, H., Dammertz, G., Erckmann, V., Flamm, J., Gantenbein, G., Hollmann, F., Jonitz, L., Kasparek, W., Kern, S., Laqua, H. P., Lechte, C., Legrand, F., Leonhardt, W., Lietaer, G., Michel, G., Noke, F., Purps, F., Samartsev, A., and Schlaich, A.

Abstract

The construction of the 140 GHz, 1 MW CW gyrotrons for the 10 MW ECRH system of the stellarator W7-X at IPP Greifswald is ongoing. While acceptance testing of the gyrotrons is progressing, reliable output parameters and stable production have been achieved. This report summarizes the actual status and some topical results. Focus is put on the final construction and latest parameters measured at factory-acceptance tests and site-acceptance tests. Parallel to the design optimization a new spectral measurement method has been developed, which allows time-dependent broadband spectral measurements with µs resolution for ms range pulses. Results of measurements done with W7-X gyrotrons are shown. [ABSTRACT FROM PUBLISHER]

Published
2012
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14. Extended operation of the 1 MW, CW gyrotrons for W7-X.

Author

Braune, H., Brand, P., Dammertz, G., Erckmann, V., Gantenbein, G., Kasparek, W., Laqua, H.P., Lechte, C., Leonhardt, W., Mellein, D., Michel, G., Noke, F., Purps, F., Schluter, K.-H., Schmid, M., and Thumm, M.

Published
2007

17. High-power tests of a remote steering launcher mock-up at 140 GHz.

Author

Plaum, B., Gantenbein, G., Kasparek, W., Schwörer, K., Grünert, M., Braune, H., Erckmann, V., Hollmann, F., Jonitz, L., Laqua, H., Michel, G., Noke, F., Purps, F., Bruschi, A., Cirant, S., Gandini, F., Verhoeven, A. G. A., Greifswald, ECRH group at I. P. P., Karlsruhe, ECRH group at F. Z. K., and Stuttgart, ECRH group at I. P. F.

Published
2005
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