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LEPTA: Low Energy Particle Toroidal Accumulator

LEPTA: Low Energy Particle Toroidal Accumulator. Presented by: Mkhatshwa S. L. Nkabi N. Loqo T. Mbebe N. Supervisor: A. Sidorin SA STUDENT PRACTICE 2010 DUBNA, RUSSIA. kicker. 10E4 o-Ps per sec. 22 Na 10E6 e+ per sec. Ps detector. LEPTA FACILITY. septum. cooling section. e-gun.

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LEPTA: Low Energy Particle Toroidal Accumulator

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  1. LEPTA: Low Energy Particle Toroidal Accumulator Presented by: Mkhatshwa S. L. Nkabi N. Loqo T. Mbebe N. Supervisor: A. Sidorin SA STUDENT PRACTICE 2010 DUBNA, RUSSIA

  2. kicker 10E4o-Ps per sec 22Na 10E6e+ per sec Ps detector LEPTA FACILITY septum cooling section e-gun positron trap Helical quadrupole

  3. е+ trap е+ source Transfer channel Septumsolenoids е-gun Collector Straight section 1. LEPTA facility Ps

  4. Main goals of the project • Particle dynamics in LEPTA • Electron cooling of positrons • Positronium generation in-flight • Experiments on Positronium physics • Feasibility studies ofslow antihydrogen generation in-flight • Applied research (Positron Annihilation Spectroscopy)

  5. Design parameters of the LEPTA

  6. Positron Injector 8 5 4 6 1 2 7 4 3 11 9 10 9 1- positron source22Na,2 - radioactive protection shield, 3 - vacuum valve, 4 - vacuum chamber for pumping out and diagnostic tools, 5 -positron trap, 6 - vacuum isolator, 7 - positron vacuum channel, 8 - vacuum “shutter” (fast valve), 9 - ion pump, 10 - turbo pump, 11 - He vessel.

  7. The Cryogenic Source of Positrons

  8. Positron source

  9. Work on the Recuperator Oscilloscope – measurement of cathode current (I) and voltage (V)

  10. Results Graph of current against voltage

  11. Work on the LEPTA Ring

  12. Application of voltage Electron gun Power Supply

  13. Electron beam image (CCD Camera)

  14. Electron beam image (illuminescent screen)

  15. WORK TO BE DONE Measure: • Shape of the beam • Charge in the accumulator • Lifetime of electron beam in the ring

  16. Problems encountered • No water • No vacuum • Low emission • Injector broke down

  17. Conclusion • We were able to measure the current of the electron beam against voltage. • Direct the electron beam, in the injector, from the gun to the collector (CCD camera). • Direct electron beam, in the ring, from the gun to the kicker (illuminescent screen). • Use vertical and horizontal correctional coils to direct the position of the beam.

  18. Acknowledgements • NRF • Dr. Jacobs • Prof. Lekala • JINR • A. Sidorin and his colleagues (LEPTA project)

  19. THE END • THANK YOU • ENKOSI • SIYABONGA

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