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The Columbia University Sub-micron Charged Particle Beam
Gerhard Randers-Pehrson1, Gary W Johnson, Stephen A Marino
1Center for Radiological Research, Columbia University, New York,, NY 10032, USA.
Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
|February 18, 2010
Summary
Researchers developed a novel electrostatic quadrupole lens system to focus helium ions to a 0.8 µm spot. This advanced ion beam focusing technology enhances precision in accelerator applications.
Area of Science:
- Physics
- Accelerator Science
- Ion Optics
Background:
- High-precision ion beam focusing is crucial for various applications in physics and materials science.
- Existing electrostatic lens systems face limitations in achieving sub-micrometer beam spot sizes and energy versatility.
Purpose of the Study:
- To design and construct a novel electrostatic quadrupole lens system for precise focusing of charged particles.
- To achieve sub-micrometer beam spot sizes for applications requiring high spatial resolution.
Main Methods:
- Designed and constructed a lens system using two electrostatic quadrupole triplets.
- Employed precise construction for alignment and varied element lengths for quadrupole strength control.
- Utilized ion implantation in insulating sections to enhance voltage stability.
Main Results:
- Successfully focused 6-MeV helium-4 ions to a beam spot with a 0.8 µm diameter in air.
- The system is capable of focusing helium-4 ions up to 10 MeV and protons up to 5 MeV.
- The novel design allows for nearly identical voltage magnitudes across quadrupoles.
Conclusions:
- The developed electrostatic quadrupole lens system achieves unprecedented sub-micrometer focusing for MeV ions.
- The innovative design and construction techniques offer improved voltage stability and operational versatility.
- This technology has significant potential for advancing research in accelerator physics and related fields.
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