RARE-EARTH PERMANENT MAGNETS AND THEIR APPLICATION IN MAGNETIC SYSTEMS OF TECHNOLOGICAL ELECTRON ACCELERATORS

High performance rare-earth permanent magnets become crucial components of modern electron accelerators. PLP (pressless process) method was described as the advanced production step in the current rare-earth permanent magnet manufacturing. The radiation resistance of SmCo and Nd-Fe-B magnets under electron beam with 10 and 23 MeV and bremsstrahlung were studied. Dipole magnetic systems on the base of rare-earth permanent magnets were designed for the technological electron accelerators at NSC KIPT.

VACUUM SYSTEM OF KLYSTRON REPAIR FACILITY FOR ELECTRON ACCELERATORS

KIU-12AM “AVRORA” klystron has been the main source of rf power for the accelerators for decades. Large accumulations of malfunctioning klystrons made it possible to recycle them using the donor parts, which are well preserved and still functional. Klystron repair process comprises of few stages and part of these stages requires maintaining the high vacuum inside the klystron and adjacent systems.

Dynamical Properties of Baryons

The internal structure of composite particles is conveniently described in terms of form factors (FFs)—these are experimentally accessible in annihilation and scattering of elementary reactions, and are theoretically calculable by all models that describe the properties of particles. FFs depend only on one kinematical variable, q2. This is the four-momentum transferred by the virtual photon that carries the interaction. Important developments in accelerator and detector techniques have brought impressive advances, both by extending the kinematical region and by reaching a higher precision. A critical review on the underlying methods and findings in polarized and unpolarized experiments is presented. The unique role played by polarization in determining the ratio of electric to magnetic form factors in the space-like region, and the extraction of individual form factors in the whole kinematical region, are described. Recent results at electron accelerators and electron–positron colliders confirm the existence of periodical structure in the annihilation cross section. We suggest a global framework which describes the dynamical structure of charge distribution in baryons, in order to build a coherent view of the creation and annihilation of baryonic matter.

Recirculated Wave Undulators for Compact FELs

Particular schemes of Free Electron Lasers (FELs) are designed to exploit wave undulators. We consider a system employing a recirculated electromagnetic undulator provided by a high-power laser in a resonator cavity. The aim is to establish from calculations a set of realizable parameters for such a device. Indeed, novel generation electron accelerators push forward the limits on the accelerating fields, reducing to the sub-meter scale the length over which the electrons can gain enough energy for lasing in the VUV/X-ray region of the electromagnetic spectrum. On the other hand, these innovative technologies do not solve yet the problem associated with the saturation length and therefore of the undulator length, which can be as long as several tens of meters. The option of a FEL based on a wave undulator might provide a valid solution in this respect.

Multi-GeV Laser Wakefield Electron Acceleration with PW Lasers

Laser wakefield electron acceleration (LWFA) is an emerging technology for the next generation of electron accelerators. As intense laser technology has rapidly developed, LWFA has overcome its limitations and has proven its possibilities to facilitate compact high-energy electron beams. Since high-power lasers reach peak power beyond petawatts (PW), LWFA has a new chance to explore the multi-GeV energy regime. In this article, we review the recent development of multi-GeV electron acceleration with PW lasers and discuss the limitations and perspectives of the LWFA with high-power lasers.

IMPROVED FAST PROTECTION SYSTEM AT HIGH-VOLTAGE GAS BREAKDOWNS FOR INDUSTRIAL ELECTRON ACCELERATORS

The article considers the ways to improve the protection system of linear electron accelerators ELV-1 and ELV-2 series on the basis of modern integrated and semiconductor component base. The proposed circuit solutions allowed turning off the facility power in case of gas electrical insulation breakdowns in the fast mode, that makes it impossible to work in an emergency. In order to improve the quality of control over the accelerator operation and additional informing an operator, capability of the proposed system to display information on the operator's computer monitor has been realized.

MECHANISMS OF MORPHOLOGY DEATH OF TUMOR CELL BY EFFECT NON-RADIOACTIVE AND RADIOACTIVE 195mPt-CISPLATIN

The photonuclear technology of preparation radioactive cisplatin 195mPt was been developed by the bremsstrahlung from the electron accelerators. In the novel technology, the production of 195mPt from reaction 197Au(γ,np)195mPt with a high specific activity >1 Ci/mg-1 was realized. The Ehrlich adenocarcinoma cells were been used as a neoplastic model. There are two groups: 1. tumor cells with non-radioactive cisplatin; 2. tumor cells with radioactive cisplatin (0.17 pg 195mPt-cisplatin). The number of morphology death cells as a result of radioactive cisplatin action was more than after action of non-radioactive cisplatin. The different mechanisms of the morphology death cell (necrosis for non-radioactive and apoptosis for radioactive) were detected.