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Can hydrogen be the transportation fuel in an otherwise nuclear economy?
Let’s face it: The global economy should be powered primarily by nuclear power. And it probably will by the end of this century, with a still-significant assist from renewables and hydro. Once nuclear systems are dominant, the costs come down to where gas is now; and when carbon emissions are reduced to a small portion of their present state, it will become obvious that most other sources are only good in niche settings. I mean, why use small modular reactors to load-follow when they can just produce that power instead of buffering it?
F. Leuterer, M. Münich, F. Brandl, H. Brinkschulte, G. Grünwald, A. Manini, F. Monaco, F. Ryter, H. Schütz, J. Stober, D. Wagner, W. Kasparek, G. Gantenbein, L. Empacher, C. Lechte, H. Kumric, P. Schüller, A. Litvak, A. Chirkov, G. Denisov, A. Fix, V. Illin, S. Malygin, V. Miasnikov, V. Nichiporenko, L. Popov, E. Tai, V. Zapevalov
Fusion Science and Technology | Volume 55 | Number 1 | January 2009 | Pages 31-44
Technical Paper | Electron Cyclotron Emission and Electron Cyclotron Resonance Heating | doi.org/10.13182/FST09-A4051
Articles are hosted by Taylor and Francis Online.
In 1989 the planning for a 140-GHz, 2-MW, 2-s electron cyclotron resonance heating system for ASDEX Upgrade started. These plans were finally approved in 1993. The system comprises four gyrotrons with four separate transmission lines and launchers. Although a 0.5-s test gyrotron was already installed in autumn 1994, it was only in summer 1997 when the first gyrotron of the final system was ready for use in the experiments, and in spring 2000 the system was completed with all four gyrotrons. This paper reviews the experience gained in construction and operation of this system. In particular, we describe how we solved problems with external magnetic fields affecting gyrotron operation. These fields originate both from the tokamak and from the cryomagnet of adjacent gyrotrons. We also report about the gyrotron performance, our techniques for the alignment of the transmission lines, the calibration of the polarizer mirrors, and the power calibration.