[en] The main features of the JINR tau-charm factory design with colliding beam energy up to 2,5 GeV are discussed. The booster synchrotron is designed as the injection of tau-charm factory and will be used for acceleration of 500 MeV electrons and positrons. Booster and storage ring magnet systems, power supply and RF system are described. 12 refs

[en] Requirements and possibilities of future tau-charm factory projects are reviewed. The projects to be implemented at Dubna and at CERN-ISR site are discussed. (K.A.)

[en] A review of the Tau/charm Factory in JINR (Dubna) is presented. The structure, the working regime, the parameters, and the open issues of the injector system are reviewed. A versatile magnet lattice is used in the Tau/charm collider which can realize a conventional flat beam scheme and a monochromatization or crossing angle scheme. The list of parameters of the Tau/charm Factory is given. Technical solutions for magnet elements and their power supplies used in the booster and in the collider, for RF power supplies of the collider, and for the vacuum system of the periodic cells are presented. copyright 1996 American Institute of Physics

[en] Tau-charm factory (TCF) was proposed by J. Kirkby for high precision studies of τ-leptons, τ-neutrinos and charmed particles. A number of requirements for TCF physics put hard constraints on the machine. The peak luminosity must be around the τ-lepton production threshold energy of E≅2 GeV and higher than 10³³ cm^-2s^-1. TCF must provide a high average luminosity and high luminosity must be provided is a wide energy range from E≅1.5∼2.85 GeV. In this report, the TCF lattice requirements and possible solutions were discussed. The lattices with FODO regular cells were considered to be suitable for TCF, although larger longitudinal acceptance at low emittance option is desirable. Additional studies for high emittance option with DBA and TBA regular cells are necessary to overcome small dynamic aperture. The main collider parameters of conventional and monochromatic designs were presented. And it was concluded that TCF should be designed with possibility to work not only with marginal values of emittance, but intermediate too. (M.N.)

[en] At present there are several proposals of the magnet lattices suitable for the standard and monochromatization regimes for tau-charm factory. In this paper the main features of the design using versatile lattice are discussed. The beam and machine parameters and a short description of some factory systems are presented to illustrate the design feasibility

[en] Therapeutic hyperthermia (including RF hyperthermia) in combination with radiotherapy (called thermoradiotherapy) is one of widely used contemporary cancer treatment methods. The independent electron linac and RF system or their combinations are necessary for effective therapy. Whole-body hyperthermia is used for treatment of metastatic cancer that was spread throughout the body, regional one is used for treatment of part of the body (for instance leg or abdominal cavity). Local hyperthermia with characteristic size of heating volume of 20-100 mm permits to heat tumour without overheating of healthy tissues. The thermometry of deep suited tissues during the hyperthermia process is an important and complex task. Invasive methods as thermistors, optical sensors or thermo-couples can not be widely used because all of them are able to transport tumor cells to the healthy region of the patient body. Distant methods of the temperature measurement such, as radiothermometry and acoustic thermometry can not be used for tissues seated deeper than 5-7 cm. One of possible ways to solve the problem of temperature measurement of the deep suited tissues is discussed in this article: it was proposed to use the same electrodes for RF hyperthermia and thermometry. As known electrodynamics characteristics of tissues are sufficiently depends on temperature. It was proposed to use this effect for active radiothermometry in local hyperthermia. Two opposite RF dipoles can be used as generator and receiver of pick-up signal. (paper)

[en] A number of technical aspects of τcF colliders are discussed including comparisons of the current concepts with each other and with B Factories, luminosity limits, operating energy limits, needed R/D and next steps in pushing forward with the designs. copyright 1996 American Institute of Physics

[en] The project of a storage ring complex involving heavy ion beam lines with energy up to 1 GeV/nucleon, a Tau-Charm Factory with colliding beam energy up to 2.5 GeV, a high resolution neutron source - IREN, and a synchrotron light source NK-10 with positron (electron) storage ring energy of 8-10 GeV. The Tau-Charm Factory design is based on conservative approach, i.e. high luminosity must be obtained with principles, systems and devices tested in various scientific centres. Conventional flat beam scheme and versatile magnet lattice to have the possibility of using both conventional and monochromatization schemes is under study. The main features of the design on the base of the versatile lattice are discussed. (K.A.). 12 refs., 12 figs., 3 tabs

[en] Splitting of the fundamental mode in an oversized Bragg resonator with a step of the corrugation phase, which operates over the feedback loop involving the waveguide waves of different transverse structures, was found to be the result of mutual influence of the neighboring zones of the Bragg scattering. Theoretical description of this effect was developed within the framework of the advanced (four-wave) coupled-wave approach. It is shown that mode splitting reduces the selective properties, restricts the output power, and decreases the stability of the narrow-band operating regime in the free-electron maser (FEM) oscillators based on such resonators. The results of the theoretical analysis were confirmed by 3D simulations and “cold” microwave tests. Experimental data on Bragg resonators with different parameters in a 30-GHz FEM are presented. The possibility of reducing the mode splitting by profiling the corrugation parameters is shown. The use of the mode splitting effect for the output power enhancement by passive compression of the double-frequency pulse generated in the FEM with such a resonator is discussed.