Underground lab plunges researchers into the dark (matter)

Located one kilometre underground, the Southern Hemisphere’s first dark matter underground physics laboratory is open. The one-of-a-kind lab will allow researchers from several Australian universities to attempt to understand the nature of dark matter and unlock the secrets of our universe.

Lead researcher on the project, Professor Elisabetta Barberio from the University of Melbourne, unveils the Stawell Underground Physics Laboratory

A lab to shine a light in the dark

The first stage of the Stawell Underground Physics Laboratory, located at the active Stawell Gold Mine in the Wimmera region of Victoria, is complete.

It takes half an hour to journey down to the lab site along a 10-kilometre drive through what seems like a maze of tunnels. Once you get there, you find a 33-metre-long by 10-metre-wide lab protected further by a product sprayed on the walls called Tekflex – which reduces the potential for interference from radon gas in the rock mass.

All this to house the SABRE detector (Sodium-iodide with Active Background REjection). With it, researchers will look for visible light emitted as dark matter particles collide with a highly sensitive crystal target.

Professor Alan Duffy, Professor Geoffrey Brooks and Dr Shanti Krishnan – all from Swinburne University of Technology – have been collaborating with scientists from other universities in the design and construction of the SABRE detector, with the main vessel at Swinburne’s Wantirna campus. The components are currently being tested in different facilities around the country before being installed underground in the Stawell Underground Physics Laboratory next year for the first experiment conducted in the lab.

“One of the critical elements developed at Swinburne has a been the ‘slow control system’ developed by a team led by Shanti Krishnan from our Factory of the Future. It is designed to ensure that all the conditions in the SABRE detector are accurately recorded, given the detector is sensitive to small changes in temperature, humidity and movement,” says Professor Geoffrey Brooks.

“It’s exciting that the cutting-edge of physics research is happening right here in Wantirna, just down the road from where I grew up. A boyhood dream has come true!”

Five research institutions will use the Stawell Underground Physics Laboratory to unlock the secrets of the universe, including Swinburne University of Technology, the University of Melbourne, the Australian National University, the University of Adelaide and the Australian Nuclear Science and Technology Organisation (ANSTO).

The Australian and Victorian governments each gave $5 million in funding for the building of the Stawell Underground Physics Laboratory, and this funding was boosted by the Australian Research Council awarding a $35 million grant for the development of a national Centre of Excellence for Dark Matter Particle Physics.

What’s the matter with dark matter?

Dark matter is an invisible and unknown form of mass, which accounts for five times more of the universe than all the atoms, or baryons, we can see. Understanding the nature of this so-called dark matter is one of the greatest challenges in the physical sciences for this century, bringing together astronomers, particle and nuclear physicists in a global hunt.