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“Design Of The Ion Extraction System In A Reaction Microscope”

Federico II University Industrial Engineering PhD School “Innovative Technologies For Materials, Sensors And Imaging” .

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“Design Of The Ion Extraction System In A Reaction Microscope”

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  1. Federico II UniversityIndustrial Engineering PhD School “Innovative Technologies For Materials, Sensors And Imaging” “Design Of The Ion Extraction System In A Reaction Microscope” Speaker: Marco Panniello

  2. Federico II University Industrial Engineering PhD School “Innovative Technologies For Materials, Sensors And Imaging” Federico II University Industrial Engineering PhD School Innovative Technologies For Materials, Sensors And Imaging” Introduction Introduction Development Conclusions Context: Purpose: Antiprotons Recycler ring for differential cross section measurements. Design of a suitable geometry for the recoil ion extraction system.

  3. Recoil Ion Momentum Spectroscopy Introduction Development - R.I.M.S. - The Recycler - Working Principles - Geometry U.C. - T.F.C. - Homogeneously - Catch & Resolve - Resolution - Suitable Geometry • high precision device • more appropriate for coincidence measurements than energy or momentum dispersive spectrometers. • Evolutions: • COLTRIMS (Cold Target RIMS); • Reaction Microscopes. Conclusions

  4. The Recycler • The projectile hits the target gas molecules generating an atomic reaction. The most common effect is the target ionization • The “recoil” ion is extracted from the collision area and accelerated toward a Time-Position sensible Detector. (MCP). Introduction Development - R.I.M.S. - The Recycler - Working Principle - Geometry U.C. -T.F.C. - Homogeneously - Catch & Resolve - Resolution - Suitable Geometry • The projectile type is antiproton, currently used for single pass experiments. • A simple structure called recycler is able to use these antiprotons more than one time. Conclusions

  5. Geometry Under Consideration Introduction Development - R.I.M.S. - The Recycler - Working Principle - Geometry U.C. -T.F.C. - Homogeneously - Catch & Resolve - Resolution - Suitable Geometry A simple structure that grants the homogeneous field on Detector axis can be taken as a basic idea. Conclusions

  6. Time Focusing Condition Introduction Development - R.I.M.S. - The Recycler - Working Principle - Geometry U.C. -T.F.C. - Homogeneously - Catch & Resolve - Resolution - Suitable Geometry • In the real case we have not a point like volume source, so we have to take in account the consequent time jitter ΔE/E=18% Conclusions

  7. Homogeneous Field Introduction Development - R.I.M.S. - The Recycler - Working Principle - Geometry U.C. -T.F.C. - Homogeneously - Catch & Resolve - Resolution - Suitable Geometry More difficult than you can expect……. ΔE/E=0.27% ΔE/E=1.4% Conclusions

  8. Acceptance vs Resolution Introduction Development - R.I.M.S. - The Recycler - Working Principle - Geometry U.C. -T.F.C. - Homogeneously - Catch & Resolve - Resolution - Suitable Geometry • A good acceptance needs a strongest field • A good resolution needs a weaker field • All depend by ion type and Spectrometer geometry Conclusions

  9. Resolution Considerations Introduction Development - R.I.M.S. - The Recycler - Working Principle - Geometry U.C. -T.F.C. - Homogeneously - Catch & Resolve - Resolution - Suitable Geometry spectrometer resolution limitations imposed by the detector As example : 10V/10cm ; Time resolution Δt = 1ns = 0.01 a.u. Position resolution Δr = 0.1mm = 0.02 a.u. Conclusions

  10. Suitable Geometry Introduction Development - R.I.M.S. - The Recycler - Working Principle - Geometry U.C. -T.F.C. - Homogeneously - Catch & Resolve - Resolution - Suitable Geometry In addition we have problems depending on the spectrometer, in terms of dimension limitations. ΔE/E=0.5% Conclusions

  11. Federico II University Industrial Engineering PhD School Innovative Technologies For Materials, Sensors And Imaging” Conclusions Introduction Development - R.I.M.S. - The Recycler - Working Principle - Geometry U.C. -T.F.C. - Homogeneously - Catch & Resolve - Resolution - Suitable Geometry After several simulation I reached a geometry With these properties: Length of acceleration region a = 7 cm Potential U = 7 V Maximum Transverse Momentum P = 8.7 a.u. It guarantee an Acceptance of 4π Transverse momentum resolution 0.02 a.u. Longitudinal Momentum Resolution 0.01 a.u. Conclusions

  12. Federico II University Industrial Engineering PhD School Innovative Technologies For Materials, Sensors And Imaging” END Grazie per l’attenzione Marco Panniello “You do not really understand something until you can explain it to your grandmother” Albert Einstein

  13. A Look Forward Introduction Development - R.I.M.S. - The Recycler - Working Principle - R.I.M.S. Theory - P// Reconstruction - T. F. Condition - P† Reconstruction - Resolution - A Look Forward • Detection of Recoil Ion only is not enough to characterize the reaction completely. • Hence, it is “sufficient” to measure the momentum vectors of all target fragments. • Since the reactions product usually consist of ions and electrons, it’s necessary a system to push them towards a detector. • The electron trajectories are easily modified by small magnetic fields. • It is possible to detect ions and electrons at the same time using both electric and magnetic fields Conclusions

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