POSTERS


Radiation Problems In Accelerators

ECOLOGICALLY CLEAN ACCELERATOR FOR NUCLEAR PHYSICS RESEARCH

V.G. Kurakinª, A.V. Koltsov

Lebedev Physical Institute of Russian Academy of Sciences, Moscow, Russia

Abstract

Rigid ecological requirements to human activity including industry and science force to search for specific technologies to reduce the undesired influence on nature. High intensity accelerators belong to the objects that produce radioactive waste. We have studied rf accelerator schema where the electron beam used is directed again into the same accelerator with appropriate phase in order to reduce beam energy down to acceptable level and in such a way to reduce radioactive problem for environment (beam energy recovering). In addition, this reduces background at experimental area as well as saves rf power in the case of superconducting rf cavities.

The following main processes have been taken into account while considering beam emittance degradation in a target: multiple electron scattering, ionization losses and bremsstrahlung. The first one results in transverse beam emittance growth while the latter two result in beam energy losses and energy spectrum width growth as well. Appropriate calculations have bean made and various plots have been presented. Critical target parameters namely target material nuclei charge as well as target thickness that allows leave a possibility the recovering process can be defines from these plots.

ª – corresponding author

Paper 

376 

FIRST RESULTS OF THE RADIATION MEASUREMENTS NEAR SIBERIA-2 STORAGE RING

V. Korchuganov, V. Novikov, V. Ushkovª

Russian Research Centre Kurchatov Institute, Moscow, Russia

Abstract

When an electron is lost in the storage ring due to a bremsstrahlung it produces high energy photons. These photons, in turn, produce neutrons. In the vicinity of the storage ring the residual radiation field is dominated by these photons and neutrons.

The report describes first results of the radiation field measurements. The measurement was carried out by a set of high sensitivity to scattered particles monitors which were placed near the vacuum chamber at critical positions of the ring.

The extended use of beam loss monitoring gives a better understanding of the linear and non-linear physics involved in the single and multiple particle dynamics.

ª – corresponding author

Paper 

374 

THE BIOLOGICAL SHIELDING FOR STORAGE RINGS OF NICA PROJECT

V.Ju. Shegolevª, B.V. Florko

Joint Institute for Nuclear Research, Dubna, Russia

Abstract

Intermediate results of biological shielding of calculations for storage rings are presented. 238U ions are accelerated in nuclotron up to the energy 3.5 GeV/nucleon and extracted to storage rings. The beam intensity of the order makes about 5∙1010 pps. Beam losses due to collisions with residual gas and on elements of the construction of a path both in work and adjustment modes were considered in calculation.

ª – corresponding author

Paper 

371