In a significant development for particle physics, Canadian researchers are playing a crucial part in the next phase of the Large Hadron Collider (LHC) at CERN, the world’s largest and most powerful particle accelerator. Based primarily in British Columbia, these scientists are constructing state-of-the-art components designed to enhance the collider’s ability to explore the fundamental mysteries of the universe. This ambitious initiative promises to unlock new insights into the nature of particles and phenomena that have yet to be understood.
From Vancouver to CERN: The Journey of Innovation
At Simon Fraser University (SFU) in Vancouver, a team of researchers is meticulously assembling components known as “petals,” made from crystalline silicon. Each petal is crafted with precision and care, as these delicate structures will ultimately face extreme conditions in the LHC, where they will be bombarded by billions of high-energy particles. Professor Bernd Stelzer, who leads this project, emphasises the importance of this work: “The theory landscape is wide open in terms of breakthrough discoveries, but we need the data to really shed light on this.”
Approximately 200 researchers across ten Canadian institutions are involved in this monumental effort. The urgency has heightened significantly as CERN prepares for a lengthy shutdown to facilitate the installation of new equipment. Luise Poley, a scientist at TRIUMF and a project manager for Canada’s contribution to the ATLAS inner tracker, expressed the critical timeline: “The clock is ticking. Now things need to be installed, and we have a deadline.”
The Legacy of the Higgs Boson
The LHC gained global recognition in 2012 with the groundbreaking discovery of the Higgs boson, a particle integral to our understanding of mass. However, even with this monumental achievement, many questions remain unanswered. The upcoming upgrades to the LHC are aimed at exploring these unresolved mysteries, including the nature of dark matter, which constitutes a significant portion of the universe but eludes the Standard Model of particle physics.
The LHC, operational since 2010, involves two beams of protons racing in opposite directions around a 27-kilometre magnetic ring. The collisions of these protons create conditions similar to those just after the Big Bang, allowing scientists to study the resulting particles. The LHC has undergone previous shutdowns for upgrades, but the current hiatus, which is set to last 47 months, marks its longest yet.
Enhancing Collision Rates for Discovery
During this extended shutdown, scientists will overhaul the collider’s technology, including enhancements to two primary detectors: ATLAS and CMS. A key focus of these upgrades is to significantly increase the collision rate within the detectors. Markus Zerlauth, the overall project leader for the upgrade, noted, “Our goal is to increase the collision rate by a factor of 10.” Currently, the LHC achieves around 2.4 billion particle collisions per second, yielding valuable data, but the aim is to further refine these interactions to uncover rare and subtle behaviours of particles.
As part of Canada’s contribution, researchers are developing new devices known as “crab cavities,” which will be installed along the beamlines. These cavities, employing powerful magnetic fields, will help narrow the proton beams to enhance collision probabilities, thereby facilitating the collection of additional data.
The Heart of the Inner Tracker
At the core of Canada’s contribution is the construction of the inner tracker for the ATLAS detector, which will play a vital role in tracking the paths of particles produced by high-energy collisions. The design of the inner tracker includes numerous rows of petals, which will surround the collision points. As particles travel outward from the collisions, they will pass through these petals, allowing scientists to reconstruct their trajectories and identify their properties.
Canada is committed to producing approximately 1,500 petals, representing around 20% of the total required for the tracker. The assembly process, located primarily in Vancouver but also involving industrial partners in Toronto and Ottawa, combines precision engineering with innovative technology.
As the project progresses, undergraduate students like Madison Levagood from the University of British Columbia are gaining invaluable experience. “It’s incredibly exciting to be part of something so significant,” she shared, reflecting on her journey over the past three years and her upcoming work at CERN.
Why it Matters
The work being undertaken by Canadian researchers at SFU and TRIUMF is not just a local achievement; it represents a vital contribution to the global scientific community’s understanding of the universe. As the LHC prepares for its next phase, the insights gained from these efforts could reshape our comprehension of fundamental physics and potentially lead to groundbreaking discoveries in areas such as dark matter and beyond. The collaboration exemplifies how international partnerships and local expertise can come together to tackle some of the most profound questions facing science today.
