Reduced Dark Matter Detection Time Significantly with 'Pizza Gongjinki'

Invention of Pizza-Shaped Multi-Mode Resonator
Axion Detection Time Reduced to One Quarter

A new resonator design that divides a cylindrical resonator like a pizza. An antenna is installed in the central empty space (pizza saver) to read the signal.

[Asia Economy Reporter Junho Hwang] A technology that reduces the detection time of high-frequency signals of axions, a dark matter candidate, to one-quarter has been developed by a domestic research team. The research team led by Research Fellow Sungwoo Yoon at the Institute for Basic Science's Axion and Extreme Interaction Research Group developed a multi-chamber resonator that efficiently detects high-frequency signals of axions. The related research results were recently published in the American Physical Society journal Physical Review Letters.

Development of Pizza-Shaped Multi-Chamber Resonator

The Evolution of Resonator Design

This research outcome is expected to dramatically improve the detection efficiency of high-frequency signals in next-generation axion experiments. Axions are particles proposed to solve the mysteries of modern physics. When axions encounter a magnetic field, they convert into microwave electromagnetic waves, which can be detected through resonance. The principle is that when an axion signal occurs inside a resonator with a magnetic field, waves matching the resonator's natural frequency are amplified. The frequency of the signal is determined by the mass of the axion. However, since this mass is not theoretically established, experiments must cover all frequency ranges.

The research team devised a multi-chamber resonator shaped like a pizza by dividing a cylindrical resonator into several chambers, maximizing volume while increasing the natural frequency. The more chambers there are, the higher the natural frequency that can be achieved. Additionally, they created empty spaces connecting the chambers in the center, allowing the entire resonator signal to be read with a single antenna.

Research Taking 4 Years Completed in 1 Year

Research team participating in the experiment. From the left, Research Fellow Yoon Sung-woo, Former Research Fellow Kim Jin-geun, Student Researcher Jung Jun-woo

Over two years, the research team optimized the pizza resonator design and resolved machining error issues through extensive simulations and prototype testing. Even the slightest error during manufacturing can cause the electromagnetic field inside the resonator to concentrate in the largest chamber, reducing the actual detection volume. The team read the electromagnetic field interactions between chambers through an antenna in the center of the resonator. They also minimized the impact of machining errors by adjusting the size of the central space.

Using a 9-tesla superconducting magnet and a dual-chamber pizza resonator, the team conducted axion detection experiments and was able to scan frequency ranges 4 to 5 times higher than the ADMX search region within three weeks. This experiment would have taken three months with conventional resonators.

Research Fellow Sungwoo Yoon said, "Attempts to change the shape of the resonator itself have been rare, but the significance lies in greatly improving experimental efficiency simply by changing the design," adding, "If previous experiments took four years to achieve certain results, now one year is sufficient."

This content was produced with the assistance of AI translation services.