I. V. Kalagin

Roscosmos facilities for SEE testing at U400M FLNR JINR cyclotron

Aim of this report is to describe the main features of the Russian Federal Space Agency (Roscosmos) facilities which has been developed recently and will develop next year for SEE testing of the electronic devices at U400M cyclotron in Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna. At present specialized ion beam line with energy of 3÷6 MeV/nucleon O, Ne, Ar, Fe, Kr, Xe, Bi ions covering the LET range 4.5–100 MeV/(mg/cm2) is available to users. The project of ion beam line with ion energy up to 40 MeV/nucleon is presented too.

DC-60 heavy ion cyclotron complex: The first beams and project parameters

The construction of the DC-60 Heavy Ion Cyclotron for the Interdisciplinary Scientific Research Complex (ISRC) in Astana started in early 2004. The cyclotron was manufactured and tested at the Flerov Laboratory of Nuclear Reactions (FLNR) in Dubna. The main units were delivered to Astana and assembled in the ISRC building in the summer of 2006. The cyclotron was turned on in September, 2006. The first heavy ion beams in the whole A/Z and energy ranges were accelerated and extracted in December, 2006.

Heavy ion DC-110 cyclotron for industrial applications and applied studies in nanotechnologies

A cyclotron complex has been developed at the Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, for a wide spectrum of applied studies in the field of nanotechnologies (template technologies, track membranes, surface modification, etc.). This complex includes a specialized DC-110 cyclotron, which gives high intensity beams of accelerated Ar, Kr, and Xe ions with a fixed energy of 2.5 MeV/nucleon. This cyclotron is equipped by an external injection system with an ECR ion source operating at a frequency of 18 GHz. The cyclotron electromagnet with a pole diameter of 2 m offers a working magnetic field on a level of 1.67 T. The fixed RF frequency is 15.5 MHz. The beam is extracted from the cyclotron by the electrostatic deflector. The main parameters of DC-110 cyclotron are presented in this paper.

Using the FLNR Accelerator Complex for SEE Testing: State of Art and Future Development

Since 2010 the Russian Federal Space Agency (Roscosmos) has been utilizing SEE testing facilities at the Flerov Laboratory of Nuclear Reactions (FLNR) of the Joint Institute for Nuclear Research (JINR) in Dubna. The FLNR has abundant experience in development, creation and using heavy ion cyclotrons, ECR ion sources and auxiliary systems. The FLNR Accelerating Complex consists of four isochronous cyclotrons, two of them: U400 and U400M are used in programs of SEE testing with heavy ions. At present time, the accelerators equipped by four specialized beam lines for SEE testing. Beams of elements from Li to Bi in two energy ranges: 3 ÷6 MeV/nucleon (lower range) and 20 ÷50 MeV/nucleon (upper range) are available to users. Specialized beam lines provide irradiating areas up to 300 cm2 for the lower range and up to 28 cm2 for the upper one. Beam inhomogeneity over the irradiating area is not worse than 20%. On-line and ex situ diagnostics of the main experimental parameters have been provided. Annual operation of U-400 and U-400M is about 6000 hours each. Annual operation of SEE testing facilities at FLNR is about 2000 hours. The future FLNR plans of SEE testing development are presented.

Development, creation, and startup of the DC-110 heavy ion cyclotron complex for industrial production of track membranes

The DC-110 heavy ion cyclotron for industrial production of track membranes has been developed and created at the Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research. The cyclotron is equipped with an electron cyclotron resonance ion source operating at a frequency of 18 GHz. The accelerator complex was put into operation in 2012 and 40Ar6+, 86Kr13+, and 132Xe20+ ion beams with a energy of 2.5 MeV/nucleon and intensity of 13, 14.5, and 10.5 μA, respectively, were produced. Irradiation of a polymer film was carried out on a specialized channel and track membranes with a high uniformity of pores were obtained. The DC-110 accelerator complex can produce up to 2 million square meters of track membranes per year.

DC-350 accelerator complex

The DC-350 accelerator complex is described and its technical characteristics are presented.

Microbeam formation system

Equations for calculating the microbeam formation channel are derived. The channel consists of two coaxial diaphragms with radii r 1,2 and a target with a radius r T . With the given ion beam parameters, distance between the diaphragms L, beam radius on the target r T , and desired efficiency of beam passage through the diaphragms η0, the system of equations allows calculating the distance from the second diaphragm to the target L 1 and the radii of both diaphragms. Dependences of the diaphragm radii and the distance L 1on the efficiency η0 at a fixed target radius r T and of the efficiency η0 and the diaphragm radii r 1,2 on the distance L at a fixed distance L 1 are found. The effect of the deviations of the main channel and beam parameters from the optimum values on the microbeam formation efficiency is estimated. Tolerable values are determined for the diaphragm displacement and background magnetic field.

Correction of vertical displacement of extracted beam during commissioning tests of the DC-110 cyclotron

The specialized DC-110 heavy ion cyclotron has been developed and created at the Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research for the BETA research and production complex in Dubna (Russia), which allows producing intense accelerated Ar, Kr, and Xe ion beams with a fixed energy of 2.5 MeV/nucleon. Commissioning works on the cyclotron complex, during which the design parameters were obtained, were carried out at the end of 2012. During commissioning of the accelerator, vertical displacement of the beam was found at the final acceleration radii and during its extraction. It is shown that the main cause of this displacement was the occurrence of a radial component of the magnetic field in the median plane of the magnet caused by asymmetry of the magnetic circuit. Vertical beam displacement was corrected by creating asymmetry of the current in the main electromagnet winding of the DC-110 cyclotron.

Proposed design of axial injection system for the DC-280 cyclotron

The design of the high-voltage axial injection system for the DC-280 cyclotron that is being constructed at the Flerov Laboratory of Nuclear Reactions (FLNR) at the Joint Institute for Nuclear Research (JINR) is presented. The injection system will make it possible to efficiently inject ions of elements ranging from helium to uranium with the ratios of their atomic mass to the charge varying from 4 to 7.5.