Manipulating hydrogen atoms using permanent magnets: Characterisation of a velocity-filtering guide

Area of Science:

• Atomic and Molecular Physics
• Beam Manipulation Technology
• Magnet Design

Background:

• Purifying hydrogen atom (H atom) beams is challenging due to limited effective techniques.
• Existing methods struggle to separate H atoms from precursor molecules and seed gases.
• Selective manipulation of H atoms is crucial for advanced atomic physics experiments.

Purpose of the Study:

• To develop and characterize a novel radical beam filter for purifying hydrogen atom beams.
• To investigate the deflection capabilities of Halbach arrays for H atom manipulation.
• To generate a pure and velocity-selected H atom beam using magnetic guiding.

Main Methods:

• Utilized a hexapole Halbach array to deflect hydrogen atoms from a Zeeman decelerator.
• Experimentally characterized H atom deflection by tilting and shifting the Halbach array.
• Designed and implemented a radical beam filter with four series-arranged Halbach arrays and skimming blades.
• Complemented experimental measurements with detailed simulations to analyze filter properties.

Main Results:

• Demonstrated effective deflection of hydrogen atoms using a single Halbach array.
• The radical beam filter successfully deflected H atoms away from the main beam axis.
• Skimming blades blocked all other beam components, ensuring high purity.
• Experimental data and simulations confirmed the filter's high effectiveness.

Conclusions:

• Halbach arrays provide a viable method for the preferential manipulation of hydrogen atoms.
• The developed radical beam filter is highly effective in generating pure, velocity-selected H atom beams.
• This technique offers a significant advancement in beam purification for atomic physics research.