1 experimental determination of the stable boundary for a cylindrical ion trap andrew alexander, dr....
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Experimental Determination of the Stable Boundary for a Cylindrical Ion Trap
Andrew Alexander, Dr. Victor Kwong*, Brad Clarke, James BeneventeUNLV Summer REU Program,
Las Vegas, Nevada
August 9, 2010
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Introduction
Ion Traps: first designed with hyperbolic electrodesEquations of motion – exact analytic
solutionDifficult fabrication process
Cylindrical ion trapEasily constructed and functional
alternativeTheoretical model remains elusive.
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Objective
Ions near center of trap “see” approx. hyperbolic potentialsGood starting pointExact trapping parameters must be
determined experimentally Goals:
Determine stable boundary for cylindrical design
Compare findings: simulated results & hyperbolic electrode theory
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System Components
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System Components
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System Components
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System Components
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System Components
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System Components
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Trap Design Basics
Ring electrode:AC potential (V0) & DC potential offset (U0)
end capelectrodes
ringelectrodes
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Theory – Hyperbolic
Ion equation of motionForm of Mathieu differential equation:
& – linearly related - V0 and U0
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Simulation - Cylindrical
Ion equation of motionNo simple solution
Turn to simulation program: SimIonNumerically determine ion trajectory
& defined the same – comparison
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Methods
Experiment 1 Experiment 2 (Delta U0)
Ions created and stored with au near boundary
Ions storage times: 345 & 690 ms
Ions created and cooled – 700 ms
Ideal trapping parameters
U0 brought near boundary
2 ms storage time near boundary
Basic Process Ion signal scanned as a function of Uo Boundary approx. where signal is lost
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Global Comparison of Results
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Conclusion
Creation of ions near the boundary adversely affects ion population
Trap design appear to “leak” ions over time
Delta U0 approach minimizes these complications
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Acknowledgments
Dr. Victor Kwong Brad Clarke James Benevente Financial support from NSF REU
program DMR-1005247 is gratefully acknowledged.
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