Sensitivity of combined albedo-track personnel dosimeters of neutrons behind the shield of the proton synchrotron of the institute of high-energy physics

Translated from Atomnaya Énergiya, Vol. 69, No. 3, pp. 171–175, September, 1990.     

Pneumatic fast-closing valve for synchrotron radiation beam linesat the photon factory

A fast-closing valve system has been designed and fabricated in order to protect the vacuum of the synchrotron radiation beam line and that of the 2.5 GeV storage ring from a sudden vacuum failure at the downstream end of the beam line. Upon the detection of a failure the valve closes within 11.9 ms by pneumatic pressure on a drive piston in a cylinder. Within the last 3.7 ms of the closing time the downward movement of the blade is decelerated so as to reduce the closing shock. A hard TiN ceramic membrane is coated on the surface of the titanium blade. On the surface of a stainless steel aperture, an Al₂O ₃-TiO₂ ceramic membrane (less hard than TiN) is coated in order to attain low conductance and smooth movement of the blade. This ensures a low leak rate of 0.135 torr l/s and a long life cycle of the mechanism (more than 8000 times)     

Formation of the dendrite structure at ion beam synthesis in the external magnetic field

For the first time the dendrite structure on the surface of single-crystal silicon wafers implanted with Fe⁺ at high fluences in the applied magnetic field was revealed by atomic-force microscopy. The nucleation and growth of dendrites were simulated using the modified model of the diffusion limited aggregation at ion implantation. The magnetic dipole–dipole interaction between diffusing implanted atoms and forming ferromagnetic clusters was also considered. In the frame of this model the form of the dendrite structure is mainly determined by the effective magnetic moment and the diffusion coefficient.     

Angle and energy characteristics of neutrons produced by a high-energy ion beam

Translated from Atomnaya Énergiya, Vol. 66, No. 3, pp. 213–215, March, 1989.     

Research in high-energy particle physics performed on the synchrocyclotron of the laboratory for nuclear problems of the joint institute for nuclear research

Summary In brief summation of the physics research performed on the six-meter synchrocyclotron in the Laboratory for Nuclear Problems, one may say that it has contributed valuable information to high-energy physics. It has broadened our knowledge in this field of modern physics and it has aided in exposing a series of new important problems and indicating effective methods for their study.To a large extent it is due to this research that the young science of high-energy physics has come to occupy a lasting place among the other sciences of our nation.Work on the six-meter synchrocyclotron has proved a good school in developing a large group of Soviet scientists with a mastery of modern physics, as well as engineers and designers with various specialties who have become familiar with totally new techniques.During 1956–1957, as a result of the organization of the Joint Institute for Nuclear Research, the laboratories of the Institute have been enriched by scientists from foreign countries. The Institute has become an international center for nuclear research, and one of its goals is the instruction of groups of physicists from the twelve nations participating in the Institute.On the glorious fortieth anniversary of the Great October, The High-Energy Laboratory of the Joint Institute for Nuclear Research has turned on the gigantic 10 Bev proton synchrotron, opening for modern nuclear physics additional new perspectives for further development.     

IRT research reactor at the physics institute of the Academy of Sciences of the Latvian SSR

Translated from Atomnaya Énergiya, Vol. 64, No. 5, pp. 354–360, May 1988.