Getter Films for Vacuum System Applications

Getter films, particularly non-evaporable getters, constitute a critical technology for maintaining ultrahigh vacuum in a broad spectrum of scientific and industrial systems. These thin metallic coatings, typically comprising alloys of titanium, zirconium and vanadium, chemisorb residual gases including hydrogen, oxygen, nitrogen and carbon oxides. Activation by controlled heating removes surface oxides and exposes fresh getter sites, establishing a self-regenerating pumping mechanism without moving parts or external power. Recent advances have focused on optimising film microstructure, deposition techniques and substrate compatibility to enhance sorption rates, thermal stability and electrical and electromagnetic properties. Applications span particle accelerators, synchrotron storage rings, neutral beam injectors for fusion devices and micro-electromechanical systems, where getter films deliver sustained low pressure, reduced outgassing and mitigation of deleterious effects such as electron cloud formation and secondary-electron emission. Progress in characterising getter performance across frequencies from DC to sub-terahertz regimes and in developing large-scale getter cartridges underscores their global significance, offering compact, reliable vacuum pumping solutions for emerging high-energy and fusion technologies.

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Getter Films for Vacuum System Applications publication trend

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Technical terms

Non-evaporable getter (NEG): A chemically active thin film alloy that sorbs residual gases in vacuum systems after thermal activation, without forming a gaseous phase itself.

Pumping speed: The volumetric flow rate at which a vacuum pump or getter film removes gas, typically expressed in litres per second.

Activation temperature: The minimum temperature at which a getter film’s surface oxides are desorbed to reveal reactive sites for gas sorption.

Regeneration: The thermal reactivation process whereby a spent getter film restores sorption capacity by releasing trapped gases and re-exposing fresh metal surface.

Resistive-wall impedance: The electromagnetic resistance and reactance encountered by charged particle beams due to conductive coatings on vacuum chamber walls, affecting beam stability and power loss.

Sub-terahertz spectroscopy: A measurement technique using electromagnetic waves in the 0.1–1 THz range to characterise material properties such as conductivity and permittivity.

References

1. Sub-THz Characterization of Technical Surfaces for Particle Accelerator Vacuum Chambers. Sensors (2024).
2. Experimental Characterization of an NEG Pump of Novel Size—A Major Step toward Its Application in DEMO Neutral Beam Injectors. Energies (2023).
3. Commissioning and operation status of the MAX IV 3 GeV storage ring vacuum system. Journal of Synchrotron Radiation (2021).
4. Development and Characterization of Non-Evaporable Getter Thin Films with Ru Seeding Layer for MEMS Applications. Micromachines (2018).