45° Tandem Parallel Plate Analyser
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45° TANDEM PARALLEL PLATE ANALYSERSIMION PROJECT
Louise BelshawSpiros Divanis
Patrik GunackerPeter Herczku
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PPA ONE
PPA TWO
IONS, ELECTRONS IONS
ELECTRONS
SIMION Project: Tandem PPA Analyser
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SIMION Project: Tandem PPA Analyser
`Tandem Parallel Plate Analyser:
• Build a simple tandem PPA, consisting of two PPAs placed at 90°.• Investigate required voltages and angles of acceptance.
• Add an Einzel lens before the input slit of PPA1, and place another between the exit of PPA1 and the entrance of PPA2.• How does this change our results?
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SIMION Project: Tandem PPA Analyser
`SIMION Project: Tandem PPA Analyser
SIMPLE TANDEM PPA
PPA ONE
PPA TWO
0
0i
PASSii0d
L)2(Sind2f
EfVV
For this PPA, f = 0.6Electrons of KE = 1000 eVExpect required V = -600 VUsed: -597 V
SIMION results
Required Deflecting voltage:
Acceptance Solid Angle:
Transmission:
α = ± 3°β = ± 5°Ω = 4αβ = 0.018 steradians
Strong angular dependence:With α = 3, β = 5, T = 0.2 % α = 1, β = 1, T = 3 %
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SIMION Project: Tandem PPA AnalyserSIMION Project: Tandem PPA Analyser
SIMPLE TANDEM PPATypical Particle Definitions:
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SIMION Project: Tandem PPA Analyser
TANDEM PPA WITHOUT FOCUSSING
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SIMION Project: Tandem PPA Analyser
`TANDEM PPA WITH EINZEL LENS
EINZEL LENS 1
EINZEL LENS 2
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SIMION Project: Tandem PPA Analyser
`TANDEM PPA WITH EINZEL LENS
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TANDEM PPA WITH EINZEL LENSSIMION Project: Tandem PPA AnalyserSIMION Project: Tandem PPA Analyser
Voltages:
Transmission:
With α = 3, β = 5, T = 5 % α = 1, β = 1, T = 30 %
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SIMION Project: Tandem PPA Analyser
`TANDEM PPA WITH DECELERATION AND FOCUSSING
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SIMION Project: Tandem PPA Analyser
`TANDEM PPA WITH DECELERATION AND FOCUSSINGVoltages:
Transmission:
With α = 3, β = 5, T = 0.4 % α = 1, β = 1, T = 9.2 %
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SIMION Project: Tandem PPA Analyser
TRANSMISSION COMPARISON
PPA Type Transmission, α = 3, β = 5 Transmission, α = 1, β = 1
No focussing 0.2 3
Focussing 5 30
Focussing and deceleration
0.4 9.2
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