DEVELOPMENT OF THE POSITRON INJECTOR FOR LEPTA FACILITY

V. Bykovsky¹, I. Meshkov¹, V. Pavlov¹, R. Pivin¹, A. Rudakov¹, G. Trubnikov¹, S. Yakovenkoª¹, M.K. Eseev²

¹Joint Institute for Nuclear Research, Dubna, Russia

²Lomonosov Pomor State University, Arkhangelsk, Russia

Abstract

An injector of the low energy positrons for the accumulator LEPTA has being assembled at JINR. The injector is based on ²²Na radioactive source. Positrons from the source are moderated in the solid neon. The cryogenic source of slow positrons has been tested with a isotope ²²Na of the initial activity of 0.8 MBk. The continuous slow positron beam with average energy of 1.2 eV, width of a spectrum 1 eV has been obtained. The achieved moderator efficiency is about 1 %.

The accumulation process in the positron trap was investigated with electron flux. The life time of the electrons in the trap, τ_life≥80 s and capture efficiency ε~0.4 have been obtained. The maximum number of the accumulated particle was N_exper = 2∙10⁸ at the initial flux of 5∙10⁶ electrons per sec.

ª – corresponding author

Paper Slides

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