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Fountain Spectrometer PowerPoint Presentation
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Fountain Spectrometer

Fountain Spectrometer

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Fountain Spectrometer

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  1. FountainSpectrometer Alexander Koukras Gyula Nagy Miguel Fernández

  2. Topics • Geometry • Calibration • Transmission • Focusing properties • Resolution • Conclusions

  3. Geometry • JustPPAwith 2πcylindricalsymmetry (rotatingaround x axis) • AdvantagecomparedtoPPA: • Greateracceptance: more solidangle (2πsymmetry)

  4. Calibration • Linear relationbetweenE0 and Vd • Here, q=-1 (e) so • For 45º RelationVd, E0: UsingLUA

  5. Calibration (45º & 30º) Slope Formula  Slope

  6. Transmission • T(%) = • For a fixedKE of particles and itscorrespondingVd (calibration) • Flyparticlesslightlydifferentangles measure #particlesenter, #particlespassthrough • 45º  T= 98.5% • 30º  T= 20% !!! • Widerexitslit + 3rdplate (onlyfor 30º)

  7. Transmission (3 plates) • Now: T = 92% • f doesnotchange • 3rdplatenotto lose resolution

  8. Focusing properties • For 45º  1storderfocusing, focusinside • For 30º  2ndorderfocusing, focusoutside Trace width:

  9. Resolution • Luaprogramtoscanenergy,measuretheEmin and Emaxthatleavetheexitslit, and calculate R • Thelower R  thebetter

  10. Resolution • Compare 45º withtheory:

  11. Resolution • Independent of energy • 30º has betterresolutionforsamegeometry • For 30º, R doesnotchangewith3rdplate + widerexitslit

  12. Conclusions • Betterresolutionfor 30º • Betterfocusingfor 30º • Lowertransmissionfor 30º • Solution: 3rdelectrode + widerexitslit

  13. Allinformation fountainspectrometer.blogspot.com QRCode

  14. Thanksforyourattention Thankstoouradvisors: • ManolisBenis • Pilar Garcés And allotherCPOTSteachers