Hande Akbas Kealan Naughton Alexander FuchsFuchs Kingdon Trap Kingdon Trap with SIMION Create a working Kingdon trap in SIMION Results Energy range of potentially trapped particles Improvements ID: 511881
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Slide1
Kingdon Trap
Hande Akbas
Kealan Naughton
Alexander Fuchs-Fuchs Slide2
Kingdon TrapSlide3
Kingdon Trap with SIMION
Create a working Kingdon trap in SIMION
Results - Energy range of potentially trapped particles
ImprovementsSlide4
What is a
Kingdon
Trap?
One of the first ion trapsRadial trapping - two concentric cylinders with potential differenceAxial trapping -ends with higher potentialIons are trapped in stable orbits if they possess the right angular momentumStatic applied voltage results in a radial logarithmic potential between the electrodes
Ions pulled in elliptical orbitsSlide5
How it works
Static applied voltage results in a radial logarithmic potential between the electrodes
Ions pulled in elliptical orbitsSlide6
The Kingdon Trap
Symmetrical device
Inner cylinder a wire
Outer cylinder a hollow tubePut caps on the endsSlide7
Theory
Maximum and minimum energies defined by maximum and minimum orbits
Energy Max: 768 eV
Energy Minimum: 43 eVSlide8
The Trap
Outer cylinder radius: 50 mm
Length: 300 mm
Inner cylinder: 5mmThe end caps separated by a few mmSlide9
SIMION steps
Build the Geometry
Fly the first particlesSlide10
Getting the particles inside
Problem: Sealed cylinder
Make injection point
This addition must be kept same potential as caps and outer cylinder, for uniform distributionSlide11
In action
Getting the particles insideSlide12
Defining the energy range
Energy
Too High: Collide with outer cylinder
Too Low: Collide with inner rodSlide13
What we found
Inner rod Potential: -3200 V
Caps and cylinder: 20 V
Minimum energy: 43 eV (38 eV)Max energy: 580 eV (768 eV)Mass independentSlide14
Improvements
Never been reported to produce mass spectra
Modified version - Orbitrap - used as a mass spectrometerSlide15
Orbitrap
Type of mass spectrometer
outerbarrel-like electrode and coaxial inner spindle like electrode
Electric field: quadro-logarithmic potential distributionSlide16
Orbitrap
Oscillation frequency: independent of ion velocity, Inversely proportional to square root. Characteristic of the mass of the particle
High accuracy: 1-2 ppm
High resolving power: 200,000resolving power proportional to the number of harmonic oscillationsSlide17
Conclusions
Simulation of a working ion trap
Defined energy range agrees with theory
Upgrades can be made into a working mass spectrometerSlide18
Don’t get Caught