Yakovenko, S.
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DEVELOPMENT OF THE POSITRON INJECTOR FOR LEPTA FACILITY |
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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, τlife≥80 s and capture efficiency ε~0.4 have been obtained. The maximum number of the accumulated particle was Nexper = 2∙108 at the initial flux of 5∙106 electrons per sec. ª – corresponding author |
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STATUS OF THE LEPTA PROJECT |
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V. Bykovsky, E. Ahmanova, V.I. Kaplin, V.N. Karpinsky, A. Kobetsª, V. Lokhmatov, V. Malakhov, I. Meshkov, R. Pivin, A. Rudakov, G. Trubnikov, S. Yakovenko Joint Institute for Nuclear Research, Dubna, Russia Abstract The project of the Low Energy Positron Toroidal Accumulator (LEPTA) is under development at JINR. The LEPTA facility is a small positron storage ring equipped with the electron cooling system. The project positron energy is of 4÷10 keV. The main goal of the facility is to generate an intense flux of positronium atoms – the bound state of electron and positron. The focusing system of the LEPTA ring after solenoidal magnetic field remeasurement and correction has been tested with pulsed electron beam by elements. Some resonant effects of beam focusing have been observed. Storage ring of LEPTA facility was commissioned in September 2004. Since then the ring was equipped with additional beam diagnostics. The magnetic field quality in the ring was improved. Results of testing the storage ring with electron beam after the upgrade are presented. The experiments aiming to increase the life time of the circulating electron beam and test the electron cooling elector beam are in progress. ª – corresponding author |
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