Fountain Spectrometer

# Fountain Spectrometer

## Fountain Spectrometer

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##### Presentation Transcript

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