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Fountain Spectrometer. Alexander Koukras Gyula Nagy Miguel Fernández. Topics. Geometry Calibration T ransmission Focusing properties Resolution Conclusions. Geometry. Just PPA with 2 π cylindrical symmetry ( rotating around x axis) Advantage compared to PPA :
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FountainSpectrometer Alexander Koukras Gyula Nagy Miguel Fernández
Topics • Geometry • Calibration • Transmission • Focusing properties • Resolution • Conclusions
Geometry • JustPPAwith 2πcylindricalsymmetry (rotatingaround x axis) • AdvantagecomparedtoPPA: • Greateracceptance: more solidangle (2πsymmetry)
Calibration • Linear relationbetweenE0 and Vd • Here, q=-1 (e) so • For 45º RelationVd, E0: UsingLUA
Calibration (45º & 30º) Slope Formula Slope
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)
Transmission (3 plates) • Now: T = 92% • f doesnotchange • 3rdplatenotto lose resolution
Focusing properties • For 45º 1storderfocusing, focusinside • For 30º 2ndorderfocusing, focusoutside Trace width:
Resolution • Luaprogramtoscanenergy,measuretheEmin and Emaxthatleavetheexitslit, and calculate R • Thelower R thebetter
Resolution • Compare 45º withtheory:
Resolution • Independent of energy • 30º has betterresolutionforsamegeometry • For 30º, R doesnotchangewith3rdplate + widerexitslit
Conclusions • Betterresolutionfor 30º • Betterfocusingfor 30º • Lowertransmissionfor 30º • Solution: 3rdelectrode + widerexitslit
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