[en] The relativistic equation which describes the electron movement, of an annular section beam, in the electromagnetic field of a cylindrical waveguide that operates in TE sub (021) mode is numerically solved. The energy exchange processes between the beam and RF fields are investigated, calculating the electron energy into the cavity. The energy extracted by electromagnetic fields of resonance cavities is provided from crossed energy of electron rotation. (M.C.K.)

[en] The theory of electron cyclotron resonance phenomena is highly developed. The main theoretical tools are well established, generally accepted and able to give a satisfactory description of the main results obtained in electron cyclotron emission, absorption and current drive experiments. In this workshop some advanced theoretical and numerical tools have been presented (e.g., 3-D Fokker-Planck codes, treatment of the r.f. beam as a whole, description of non-linear and finite-beam effects) together with the proposal for new scenarios for ECE and ECA measurements (e.g., for diagnosing suprathermal populations and their radial transport). (orig.)

[en] The effect of magnetic field on the resonance probe was observed in a diffusion type plasma. The argon discharge was maintained by means of two anode-hot cathodes biased at 75 V. The plasma container is a pyrex tube having a diameter of 30 cm. The applied magnetic field is 100 Gauss at max. range. The d.c. current frequency signal of spherical probe was obteined by varying the magnetic field for the frequency range of 1-110 MHz. The variation of measured antiresonance frequency with electron cyclotron frequency was observed. (author)

[en] The seventh Workshop on electron cyclotron emission (ECE) and electron cyclotron resonance heating (ECRH) was held in Hefei, China from 9 to 11 May, 1989. This paper provides a synopsis of presentations at the conference. The main subjects covered are the theory of electron cyclotron resonance phenomena and exploitation of these phenomena in plasma diagnostics and plasma heating

[en] This workshop was the third one on ECR-ion-sources. If we look back to the earlier ones a rapide progress in this field can be perceived. Two years ago in Karlsruhe experimental results were reported only by the Grenoble group of R. Geller. Last year in Louvain-la-Neuve we saw the first stage of ECREVIS in operation. At this workshop first experimental results of the Karlsruhe p-HISKA and the GSI-ECR source have been presented too. Two years ago the Triple-MAFIOS source in Grenoble needed some MW electrical power and had some meters in length. Today the power consumption of the Micro MAFIOS source, the p-HISKA or the GSI source is of the order of 100 kW and the total length about one meter or less. New projects for the installation of ECR-ion sources at accelerators in Juelich and Groningen were discussed at this workshop. I am quite sure, that at the next workshop in Grenoble (at the end of 1981) first results of the operation of an ECR-source at an accelerator will be presented. (orig.)

[en] The purpose of this study is to bring together some relevant ideas and developments in the field of gyrotrons. The development of the electron cyclotron resonance maser (ECRM or Gyrotron) was an important break through in microwave electronics in the 1970s. As we look to the 1980's, we find scientists channelling their collective efforts to shorten the wavelength and increase output power and efficiency, thereby yielding an important device for generating high power microwave radiation. 24 refs

No abstract available

[en] The JT-60SA project has been implemented for the purpose of an early realization of fusion energy. With a powerful and versatile NBI and ECRF system, a flexible plasma-shaping capability, and various kinds of in-vessel coils to suppress MHD instabilities, JT-60SA plays an essential role in addressing the key physics and engineering issues of ITER and DEMO. It aims to achieve the long sustainment of high integrated performance plasmas under the high β _N condition required in DEMO. The fabrication and installation of components and systems of JT-60SA procured by the EU and Japan are steadily progressing. The installation of toroidal field (TF) coils around the vacuum vessel started in December 2016. The commissioning of the cryogenic system and power supply system has been implemented in the Naka site, and JT-60SA will start operation in 2019. The JT-60SA research plan covers a wide area of issues in ITER and DEMO relevant operation regimes, and has been regularly updated on the basis of intensive discussion among European and Japanese researchers. (paper)

[en] A new mode of operation using only the second stage of the LBL ECR has been developed. This single stage mode produces charge states and currents equal to or better than the traditional two stage operation of the LBL ECR for a variety of gases such as nitrogen, oxygen, and argon. The critical parameter for this mode appears to be conditioning the plasma chamber walls with a coating of SiO₂. Various models to explain this effect will be discussed along with implications for ECR ion source design. A new Advanced ECR ion source which will operate at 14 GHz is being designed for the 88-Inch Cyclotron. Construction is scheduled to begin in the fall of 1988 and test operation should begin in the fall of 1989. The design includes hollow core copper wire solenoids, iron yoke, a Nd-Fe-B sextupole, radial pumping, and access to the plasma chamber. 8 refs., 4 figs., 1 tab

[en] The gyrotron has proven to be a powerful source in the millimeterwaves region. However fusion application calls for more power per tube. Therefore highly overmoded resonators are required, with a vary dense mode spectrum, which leads to mode-competition. The influence of external parameters - such as the electron beam, magnetic field and load - on mode competition has been investigated theoretically and experimentally. It could be shown, that even in a dense mode spectrum single-mode operation of a gyrotron is possible. Due to the optimized startup conditions high-power single-mode oscillation could be achieved in the KfK 150 GHz gyrotron experiment. In the appendices a self-consistent multi-mode theory is developed and the problems in numerically solving the differential equations of the gyrotron are investigated. (orig.)