[en] Technical and exploitation parameters of powerful electron accelerators of new generation constructed in Budker Institute of Nuclear Physics SB RAS in Novosibirsk have been shown. Two types (200 kW and 500 kW) of such accelerators designated especially for industrial applications have been presented. 4 figs

[en] Short communication

[en] A 540-kW continuous-wave (cw) klystron operating at 476 MHz was developed for use as a power source for testing PEP-II rf accelerating cavities and rf windows. It also serves as a prototype for a 1.2 MW cw klystron presently being developed as a potential rf source for asymmetric colliding ring use. The design incorporates the concepts and many of the parts used in the original 353 MHz PEP klystron developed sixteen years ago. The superior computer simulation codes available today result in improved performance with the cavity frequencies, drift lengths, and output circuit optimized for the higher frequency. The design and operating results of this tube are described with particular emphasis on the factors which affect efficiency and stability

[en] The Autonomous Marine Power Source (AMPS) is a small-scale nuclear-electric power plant initially conceived for commercial submarine applications requiring a long-endurance air-independent supply of electrical power. Refinement of the concept permits adaptation to potential applications in military nuclear/diesel-electric submarines. The initial development effort has focused on an extremely compact 100 kWe prototype power plant, but design studies indicate that on relaxing the size constraint the AMPS principles may be readily applied in the 400 to 1000 kWe range. The AMPS plant utilizes a low-pressure, low-temperature reactor heat source coupled to a low-temperature organic Rankine cycle engine generating electrical power. The dimensions and weight of the plant are necessarily constrained by the scale of the submarine, and the design incorporates features of intrinsic safety, reliability, simplicity and ease of operation conditioned to the intended mobile marine application. The use of intrinsic safety principles leads to simplification of plant systems, and thus to a cost-effective and compact design with improved likelihood of societal acceptance. This paper describes the key design features of the AMPS plant, while placing special emphasis on safety aspects

[en] Short communication

[en] A study of 1981-1992 energy production from Danish wind turbines has been carried out. The study is based on production data from the greater part of Danish wind turbines, as reported by the turbine owners and published in the magazine Naturlig Energi. The study shows a significant rise in the average energy production from 55 kW turbines erected in the early eighties to modern 150-500 kW turbines erected in 1992. The average yearly energy production of new turbines raised from rather more than 400 MWh per square meter swept rotor area in 1981 to 750-900 MWh in 1992. The main reasons for this increase are the development of larger wind turbines (with larger generator capacity, rotor area and hub height), more efficient turbines. (au) 18 tabs., 14 ills., 8 refs

[en] The paper deals with the design study of pillbox-type reduced waveguide RF window for 5 GHz klystron. Numerical simulation of the window has been carried out using the software 'CST MW Studio'. The proposed window is designed for 5 GHz operating frequency for handling a few kilowatts of RF power. The simulated results are validated through experiments. In the proposed window geometry, metalized alumina disc (99.5 % purity) of diameter 56 mm and thickness 1.5 mm is brazed in a cylindrical waveguide of diameter 56 mm. The cylindrical waveguide is terminated to WR 187 waveguide at its one end and 8 mm reduced height waveguide on the other end of the window. The return loss and insertion loss of the window length 26.7 mm has been found to be - 34.88 dB and - 0.014 dB respectively. The bandwidth of 60 MHz is achieved. (author)

No abstract available

[en] A Los Alamos design for a 1-MW pulsed neutron source incorporates a ring utilizing an rf-barrier bunching system. This bunching concept allows uniform longitudinal beam distributions with low momentum spread. Bunching cavities are operated at the revolution frequency (1.5 MHz in this case) and each of the 2nd, 3rd, 4th, and 5th revolution frequency harmonics. Their effects combine to maintain a beam free gap in the longitudinal distribution of the accumulated beam. The cavities are driven by low-plate-resistance common-cathode configured retrode amplifiers incorporating local rf feedback. Additional adaptive feed-forward hardware is included to reduce the beam-induced bunching-gap voltages well below that achievable solely with rf feedback. Details of this system are presented along with a discussion of the various feed-back and feed-forward techniques incorporated

[en] High-temperature superconductors count as the most innovative and future-oriented technology for electric motors. When these materials are used, the engine rating can be doubled and at the same time the losses halved while retaining the same size of construction. Siemens have recently developed a synchronous motor based on a high-temperature superconducting excitation winding. The rated power of the motor is 380 kW. The high-temperature superconductor that is used in this motor requires considerably less cooling outfit than low-temperature superconductors