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RF Positron Deceleration Optimization: Monte Carlo Simulations & Field Dynamics

Explore positron deceleration using RF input and electron-positron beam dynamics simulations. Results of Monte Carlo simulations from the 6th GBAR collaboration meeting in April 2012 are analyzed. RF cavities, focusing solenoids, and beam dynamics are assessed for efficient positron production and deceleration. Various cavity positions and solenoid configurations are considered for optimal deceleration of positrons close to peak energy. Enhance the deceleration efficiency by optimizing magnetic field strengths and geometric placements. Further simulations and optimizations are required to increase efficiency, considering higher initial electron energies.

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RF Positron Deceleration Optimization: Monte Carlo Simulations & Field Dynamics

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  1. Positron deceleration using RF Input e+ beam from Monte Carlo (EGS) simulations- Field RF cavity – Poisson/Superfish- Focusing solenoid – Poisson/Superfish- Beam dynamics – General Particle Tracer Marcin Staszczak National Centre for Nuclear Research (Poland) Division of Accelerator Physics and Technology 6-th GBAR collaboration meeting, 18-19 April 2012

  2. e+ production from primary e- 10 MeV beam on 1mm W target- e+ production from primary e- 5 MeV beam on 0.5mm W target Results of Monte Carlo simulations: 6-th GBAR collaborationmeeting, 18-19 April2012

  3. N Energy [MeV] e+ production(10 MeV) Primary beam e- - energy 10 MeV hits 1mm W target. The total production efficiency ~ 0.16% Energy spectrum of produced e+ after living the target: Mean energy ~ 2 MeV Most probable energy ~ 0.9 MeV 6-th GBAR collaboration meeting, 18-19 April 2012

  4. e+ production(10 MeV) Angle distribution of e+ behind the target: N Spatial distribution of e+ behind the target. Almost identical as the primary electron beam:  x coordinate (for y=0) [cm] 6-th GBAR collaboration meeting, 18-19 April 2012

  5. N Energy [MeV] e+ production(5 MeV) Primary beam e- - energy 5 MeV hits 0.5mm W target. The total production efficiency ~ 0.012% Energy spectrum of produced e+ after living the target: Mean energy ~ 1 MeV Most probable energy ~ 0.6 MeV 6-th GBAR collaboration meeting, 18-19 April 2012

  6. RF cavities L=45.7mm L=41mm L=18mm Different positions of cavities and focusing solenoid were tested. 2 or 3 cavities (gap/L = 0.54) placed one after another were considered. 6-th GBAR collaboration meeting, 18-19 April 2012

  7. Focusing solenoid Additional compensating coil was used There were analyzed 2 versions - shorter and longer Max Bz field ~ 0.7 T Lower and higher values of magnetic field were also considered. 6-th GBAR collaboration meeting, 18-19 April 2012

  8. Focusing solenoid 6-th GBAR collaboration meeting, 18-19 April 2012

  9. RF positron deceleration Deceleration and acceleration by 2 RF cavities To set the proper values of decelerating E field one can start from mono-energetic e+ beam 0.9MeV 6-th GBAR collaboration meeting, 18-19 April 2012

  10. RF positron deceleration The goal is to decelerate as many positrons as possible, close to the peak energy 0.9MeV Unfortunately the beam is divergent in all directions. 6-th GBAR collaboration meeting, 18-19 April 2012

  11. RF positron deceleration Bz ~ 0.7T Bz ~ 7T Focusing solenoid (without RF field)– shorter version 6-th GBAR collaboration meeting, 18-19 April 2012

  12. RF positron deceleration Bz ~ 0.7T Bz ~ 7T Focusing solenoid (without RF field)– longer version 6-th GBAR collaboration meeting, 18-19 April 2012

  13. RF positron deceleration Bz ~ 0.7T Bz ~ 7T Positron energy along the z axis 6-th GBAR collaboration meeting, 18-19 April 2012

  14. RF positron deceleration Bz ~ 0.7T, cavities start 100mm after the target 6-th GBAR collaboration meeting, 18-19 April 2012

  15. RF positron deceleration Bz ~ 0.7T, cavities start 1mm after the target 6-th GBAR collaboration meeting, 18-19 April 2012

  16. RF positron deceleration Energy spectrum, bin width E = 40 keV 6-th GBAR collaboration meeting, 18-19 April 2012

  17. RF positron deceleration Only about 10-4 of all positrons are decelerated below 100keV. To get more accurate data of deceleration efficiency further optimizations of decelerating and focusing fields with higher number of initial particles have to be performed. 6-th GBAR collaboration meeting, 18-19 April 2012

  18. RF positron deceleration The beam aperture was small about 10mm After increasingthe radius acceptancemorepositronsare focused and decelerating cavities can beplaced farther. This is the next stepthatwillbe considered 6-th GBAR collaboration meeting, 18-19 April 2012

  19. RF positron deceleration First results with wider aperture at the beginning and RF cavities at the end: 6-th GBAR collaborationmeeting, 18-19 April 2012

  20. RF positron decelerationCONCLUSIONS Preliminary studies have been performed. Deceleration has been observed.Pulsed positron beam in effect. Efficiency is still low. Main problem is geometry and positron divergence living the target. More optimizations and further simulations must be performed. Higher initial electron energies should be considered. 6-th GBAR collaboration meeting, 18-19 April 2012

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