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CERN Accelerating science

What is the nature of our Universe? What is it made of?

Scientists from around the world come to CERN …

… pushing the limits of technology          for the benefit of society.

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CERN Accelerating science

CERN is the European laboratory for particle physics and one of the world’s leading scientific research laboratories. CERN's business is pure research - physicists and engineers use the world's largest and most complex scientific instruments to study Nature's tiniest building blocks, the fundamental particles, to find out how our world and the Universe work. 

An early European joint venture, CERN was founded in 1954 by the Conseil Européen pour la Recherche Nucléaire (hence the acronym). The Laboratory has become a prime example of international collaboration, with 23 Members States, seven Associate Member States, three Associate Member States in the pre-stage to Membership and a global community of more than 100 nationalities.  

CERN’s mission is to perform world-class research in fundamental physics and provide a unique range of particle accelerator facilities that enable that research to take place in an environmentally responsible and sustainable way. CERN also pushes the frontiers of science and technology for the benefit of society, trains new generations of physicists, engineers and technicians, and engages all citizens in research and in the values of science. 

Find out more about CERN here . 

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CERN the science gateway

Founded in 1954, the European Organisation for Nuclear Research (CERN) is one of the world’s largest and most prestigious scientific laboratories. Dedicated to particle physics research and the study of the laws of the Universe, the organisation welcomes visitors from all over the world and offers immersive exhibitions, interactive shows and hands-on workshops for young and old alike.

A world of discoveries

CERN is famous for being home to the Large Hadron Collider (LHC), a 27-kilometre-long machine that stretches under the French-Swiss border and which, among other things, led to the discovery of the Higgs boson, in 2012. It was also at CERN that the World Wide Web was invented in 1989 and that the first antimatter particles were created in 1995. From the infinitely small to the Big Bang, CERN is constantly revolutionising our understanding of the world!

Art and culture museums

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Science, nature and specialized museums

From the cutting-edge particle physics at A Globe of Science and Innovation (CERN) to the exploration of Earth's natural beauties at the Museum of Natural History, and the captivating world of...

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CERN Accelerating science

• how do i visit cern

How do I visit CERN?

CERN has a rich educational and cultural programme. As an integral part of this programme, tours of the Laboratory are free of charge.

Find out more about CERN tours via visit.cern , which includes frequently asked questions about CERN tours .

How to get to CERN .

Preparing for your CERN visit

Will CERN generate a black hole?

Facts and figures about the lhc, cern and the higgs boson.

Is This the Nerdiest Thing You Can Do in Switzerland?

Cern, the nuclear physics science center where the world wide web was invented and the higgs boson was discovered, is open to the public for free. and it’s awesome..

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The Globe of Science and Innovation houses an exhibition, and the ribbon-like steel sculpture in front is laser-cut with 396 great physics discoveries through the ages.

Photo by Billie Cohen

Switzerland is known to travelers for many good reasons: chocolate, cheese, mountains, lakes. But “world’s largest particle physics laboratory” isn’t really at the top of their minds. Nor is the fact that they can visit that lab for free, just 25 minutes outside of Geneva. In fact, I’d argue that a visit to CERN is one of the coolest—and, admittedly, nerdiest—things you can do in Switzerland.

What is CERN?

CERN ( Conseil Européen pour la Recherche Nucléaire in French, or European Council for Nuclear Research) is an internationally run science center that straddles the border of Switzerland and France.

This place is a pretty big deal: It’s where the world wide web was invented in 1989, where antimatter was discovered, and where the so-called God particle (aka the Higgs boson) was identified in 2012, validating scientists’ model for how the subatomic world works. As a result, a lot of what we know about atoms and the universe—and I guess, cat memes—can be attributed to the work done here.

For nerds of various stripes, this is all major—as is the fact that CERN’s campus is the home of the Large Hadron Collider particle accelerator, a 16.8-mile underground track where the world’s most brilliant minds smash tiny, speeding particles together to see what they can learn.

“What astronomers do with telescopes, we do with particle detectors,” said CERN’s head of media relations, Arnaud Marsollier, in a webinar last week. “When we look at the universe, we understand only 5 percent of it. The other 95 percent, which is dark matter or dark energy, we don’t know what it is. We know it’s there’s—we have proof of that—but we don’t know what it is. So this is exactly why we are experimenting further.”

CERN is also a rare example of successful international collaboration: A group of 23 member states manage CERN today , and more than 12,000 scientists from 110 countries use the facilities and research developed here.

The Large Hadron Collider is the most powerful particle accelerator ever built; it’s made of a 27-kilometer-long ring of superconducting magnets in a tunnel 100 meters underground at CERN.

Courtesy of CERN

What kind of nuclear research is going on here?

The word nuclear in CERN’s title doesn’t have to do with nuclear warheads or weaponry at all. In fact, CERN was founded after World War II by a consortium of European countries with the mission to bring scientists together to use their intelligence for peace rather than bombs. As CERN’s convention states : “The Organization shall have no concern with work for military requirements and the results of its experimental and theoretical work shall be published or otherwise made generally available.”

So why is the word nuclear in CERN’s title then? Because at the time of CERN’s founding, physics research was focused on understanding the inside of atoms—or the nucleus—and it was called “nuclear.” Today, that area of study is known as particle research. CERN develops technologies in three areas: particle accelerators, particle detectors, and computing. And the scientists here aim to answer questions including:

• What is the unknown 95 percent of the mass and energy of the universe?
• Why is gravity so weak compared to other forces?
• Why is the universe made only of matter, with hardly any antimatter?
• Is there only one Higgs boson, and does it behave exactly as expected?

In the process, their efforts have concrete, real-world applications for daily life. For example, accelerator technologies are used in cancer radiotherapy, and other tech helps with innovations in 3D color X-ray imaging and PET-scan imaging and diagnostics.

Is it safe to visit? Yes. However, over the years, some have raised concerns about the Large Hadron Collider (LHC) creating microscopic black holes (it can’t) or emitting cosmic rays. So the center’s website offers detailed explanations to assuage any fears, explaining, for example, “The Universe as a whole conducts more than 10 million million LHC-like experiments per second. The possibility of any dangerous consequences contradicts what astronomers see—stars and galaxies still exist.”

Renzo Piano designed CERN’s new Science Gateway; its tubular structure references the track of the Large Hadron Collider, and the forest planted around it suggests the connection between science and nature.

What can visitors can do and see at CERN?

The most innovative thing about this manicured, sprawling science mini-town is that everything the scientists do here is completely public. All of their research is accessible to everyone—and so is the campus. Free guided tours are offered in English and French and led by CERN staffers, such as physicists, engineers, and technicians. On the tours, guests can view the facility’s first particle accelerator, the synchrocyclotron, installed in 1957, and also peep into the control room that oversees the ATLAS experiment, which helped identify the Higgs boson in 2012. When I visited, my tour guide proudly stated, “Nothing is hidden.”

This month, CERN added another way for the public to engage with its work: a new exhibition and education center, dubbed the Science Gateway , designed by starchitect Renzo Piano. (He’s also responsible for New York’s new Whitney Museum, Paris’s Centre Pompidou, London’s Shard, and another Swiss beauty, the Zentrum Paul Klee in Bern.)

“This will be a place where people meet: kids, students, adults, teachers and scientists, everybody attracted by the exploration of the Universe, from the infinitely vast to the infinitely small. It is a bridge, in both a metaphorical and a real sense. This building is fed by the energy of the Sun, landed in the middle of a newly grown forest,” Piano said in a press release about the opening.

On the outside, the building looks like two parallel tubes connected by a bridge—a nod to CERN’s accelerators—and is carbon neutral, thanks to 4,000 square meters of solar panels. More than 400 trees were also planted around it, creating the effect that it’s floating above a forest.

Inside, the Science Gateway has three exhibitions (Discover CERN, Out Universe, and Quantum World), and it hosts science shows in a theater and hands-on workshops (for school groups as well as for individual visitors). There are also public events, like the upcoming Dark Matter Day with a talk by Nobel Prize–winning astronomer Michel Mayor (November 3) and a live performance of The Infinite Monkey Cage podcast featuring physicist Brian Cox and comedian Robin Ince (January 12).

Visitors can see CERN’s first particle accelerator, the synchrocyclotron, installed back in 1957.

How to visit

CERN is a 25-minute tram ride from Geneva’s city center, and some hotels may even offer free transport cards.

The Science Gateway ‘s exhibitions are open Tuesday–Sunday 9 a.m.–5 p.m. (reception opens at 8 a.m.). Tours can be booked at the Science Gateway on a first-come, first-served basis.

CERN Accelerating science

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Exploring farther: machines for new knowled...

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Lab workshops, guided tours, plan your visit, families and individual visitors, opening hours, accessibility, big bang café, getting here, group bookings (min 12 pers), public events.

Public events at CERN are organised with the support of the CERN & Society Foundation

Exploring farther: machines for new knowledge

Cern70 official ceremony: inspiring the future.

The CERN Science Gateway project is made possible thanks to the generous support of its donors. Click below to discover them all.

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Top choice in Geneva

Founded in 1954, the European Organization for Nuclear Research (CERN), 8km west of Geneva, is a laboratory for research into particle physics. It accelerates protons down a 27km circular tube (the Large Hadron Collider, the world's biggest machine) and the resulting collisions create new matter. Come anytime to see the permanent exhibitions shedding light on its work. Group tours of 12 or more can be booked in advance, but individual tours must be booked on site, up to an hour in advance.

Tours often fill up months ahead – access the online booking portal at http://visit.cern/tours/guided-tours-individuals. To get here take tram 18 from the main train station.

Get In Touch

022 767 84 84

https://​www​.cern​.ch​/

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More From Forbes

Cern digital storage demand will soar with more intense physics experiments.

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A worker rides on his bicycle in the CERN's Large Hadron Collider (LHC) tunnel during maintenance.

In late May, I had a chance to visit CERN, near Geneva, and visit with Jakub Mościcki, head of CERN’s Storage and Data Management Group in the CERN IT Department and Alberto Di Meglio, head of IT innovation, including CERN openlab. CERN conducts one of the world’s largest science experiments and the facility houses the world’s largest particle accelerator, the Large Hadron Collider (LHC). We had a discussion and tour of CERN’s main data center and I also got to see the antimatter factory (which I mentioned in an earlier blog). We spoke about digital storage and data management for the large volume of scientific data generated by CERN particle physics experiments.

The CERN Storage and Data Management Group designs and operates large-scale, open-source storage services in order to manage storage for experiments, both data taking and long-term archiving for the various research programs (there are 37 of these), including the LHC. The group also supports global data distribution and management to about 200 computer centers worldwide and end-user access and analysis on edge devices such as laptops, desktops and computer clusters.

This group also supports cloud and infrastructure storage including home directories, block and object data access. The image below, from my briefing, gives an idea of CERN storage services and its support of experiments, users and data centers. Ceph provides block devices for compute services such as batch and interactive clusters, while CERNBox provides storage for data analysis integrated with end-user access to data on edge devices. EOS is the the large-scale disk system with much of the facilities data stored on hard disk drives (over 1exabyte of storage on over 100,000 HDDs). CERN’s Tape Archive has about 750PB of data on 180 tape drives in 5 library systems.

Digital Storage Applications at CERN

Currently CERN makes minimal use of SSDs and other NVMe storage devices, mainly using them for efficient metadata handling and some high IOPs applications. Digging deeper into our understanding of particle physics requires regular upgrades in CERN’s facilities. The image below shows the history of increases in the luminosity (that is the intensity of particle collisions generation) in the LHC over the years and projected into the future (up to 2040).

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CERN LHC Luminosity History and Roadmap

The increase in the intensity of the particle collisions generation results in increasing data generated during experiments, which then needs to be stored, archived and shared with researchers all over the world. The charts below show CERN HDD (left) and magnetic tape (right) storage capacity increases from 2010 through 2024.

Storage Capacity Growth in HDDs and Magnetic Tape at CERN

Looking out beyond 2024, increases in the data generated during CERN experiments is projected to grow even further, with hard disk drive demand likely to be in a range of 5-10EB by 2037. With the growing amount of data archived, magnetic tape is expected to increase in installed capacity by much more, likely over 6EB of tape archival storage required by 2032. The image below shows Alberto Di Meglio with me in front of a Spectra Logic Tfinity tape library in the CERN main data center.

Alberto Di Meglio and me in front of a Spectra Logic Tape Library at CERN

CERN follows evolution of the technology and is ready to explore the move from HDDs using conventional magnetic recording (CMR) with perpendicular magnetic recording (PMR) to PMR HDDs with shingled magnetic recording (SMR, where tracks are written partially over each other to increase the track density and thus the HDD storage capacity). SMR drives have no significant read performance penalty, however, they are most useful for applications where data is written only once, since re-writing data on an SMR HDD requires extra steps, slowing write performance.

In addition, CERN plans to explore heat assisted magnetic recording (HAMR) HDDs as these become available. HAMR drives from Seagate are now available with 32TB capacities. I also spoke with my hosts about dual actuator HDDs, which could improve HDD data rates and might be useful to support the large data streams from their physics experiments.

Regarding future plans for archiving, CERN will continue to use magnetic tape but they are also looking into other data archiving technologies, including optical storage approaches such as those of Cerabyte (using a ceramic disc) and Project Silica (using quartz glass). They are also keeping an eye on using DNA storage for archiving applications.

CERN is pursuing continuous innovation using open-source software where software defined storage can be used to maximize performance at minimum hardware cost. They also seek to optimize the use of expensive tape infrastructure and provide new ways of accessing and sharing data for end-users “on the edge.” CERN also wants to integrate with Open Science FAIR services as well as data management and worldwide research infrastructures.

CERN, based near Geneva, Switzerland, hosts big physics experiments, including the LHC. The amount of data from these physics experiments is projected to swell over the next 10+ years, especially in the data requirements for archiving its scientific data. This will drive innovations in management software as well as storage hardware requirements.

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Responsible computing and accelerating scientific discovery across HPC, AI, and Quantum

• by Matthias Troyer, Technical Fellow and Corporate Vice President of Quantum at Microsoft
• Content type

Azure Quantum

• quantum computing

High-performance computing (HPC), AI, and future quantum computing systems have the potential to help humanity make progress against some of the most complex scientific problems facing the planet, including climate change, food insecurity, and new treatments for diseases. Unlocking the full potential of these computing technologies will require global collaboration among public and private institutions.

To foster the positive impacts of these technologies, we must first ensure that responsible use is at the center of their development and deployment.

Responsible AI initiatives have demonstrated the importance of proactively understanding and addressing risks that arise from advances in computing. One well-known example is the risk that future scaled quantum computers present to public-key cryptography. Chemistry applications leveraging HPC, AI, and in the future, quantum computing are dual-use, with potential benefits and risks. To protect against malicious use and ensure the use of this technology for societally beneficial purposes, we should build on learnings from the growing field of responsible AI and adopt a “responsible computing” approach .

Global action to mitigate these risks, especially with like-minded partners, will help us safely embrace technologies across the classical and quantum stack to the benefit of all of humanity. The recently launched Open Quantum Institute (OQI) is an exciting example of the importance of global collaboration bridging science, diplomacy, industry, and non-governmental organizations (NGOs) to realize this vision of inclusivity in the technology and its applications.

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HPC, AI, and Quantum can help condense years of scientific discovery

Today, AI has powerful applications across the humanities and the sciences. In January, Azure Quantum and Pacific Northwest National Laboratory (PNNL) researchers shared how HPC and AI were used to accelerate the scientific discovery of new energy storage solutions. Together, the teams discovered and synthesized a new electrolyte material candidate that showed potential for resource-efficient batteries. In less than nine months, the team built a battery proof of concept with the new electrolyte, which uses 70% less lithium than electrolytes in existing lithium-ion batteries. Although further optimization is required to improve conductivity, this accomplishment demonstrates the start of an R&D paradigm shift that will empower researchers to solve the most challenging chemistry and materials science problems quickly with AI and HPC, providing substantial environmental and economic benefits.

Future quantum computing capabilities could dramatically expand applications in chemistry, biochemistry, and materials science . Scaled quantum computers could offer an exponential speed-up for modeling molecules with higher accuracy than is possible classically, equipping researchers with more reliable computational understanding and design of materials and chemicals.

Advancing innovation through responsible computing

To enable these positive applications, we must develop and provide access to these innovative technologies responsibly. This commitment to responsibility exists today with HPC and AI, and it will extend to quantum computing in the future. In partnership, we must develop a clear understanding of the risks and the path forward for mitigation.

First, we need to address the risk that quantum computing presents to public-key cryptography, which serves as the foundation for data encryption in our digital economy. We must accelerate the global migration to post-quantum cryptography and the adoption of symmetric encryption, where appropriate. The enormity of this task and the immediate threat of bad actors storing data now to decrypt later when they have access to a scaled quantum computer require urgent action from governments and the private sector. The adoption of quantum-safe cryptography can mitigate quantum computing’s unique applications in cryptanalysis and is a mandatory first step in ensuring the responsible use of quantum computing. 

Second, we need to work closely with the technology ecosystem, governments, and NGOs to develop responsible computing governance frameworks that traverse dual-use risks in chemistry applications enabled by HPC, AI, and future quantum computing systems.

The field of chemistry is inherently dual-use. We can look to Alfred Nobel’s creation of dynamite as a clear example of how scientific innovation can be both a tool and a weapon. The dual-use risk in computational chemistry is not unique to quantum computing. It exists today with AI and HPC. For example, a bad actor could misuse a chemistry application developed for a societally beneficial purpose, such as creating less toxic chemicals, to attempt to cause harm instead. We need thoughtful product-based and user-based controls that prevent malicious actors from gaining access to these capabilities with the intention of doing harm. They should include:

• Partnering with global stakeholders to develop meaningful principles to guide our development and use of this technology.
• Implementing a “Know Your Customer” approach and working with trusted partners.
• Adopting product-based technical and contractual controls to limit misuse of applications.

As we’ve learned from AI, we can’t wait to address these opportunities and risks until they are upon us. The technological landscape can evolve quickly, and early adoption of governance and risk mitigation measures sets a critical foundation for future innovation.

Global collaboration to further impact

Many of the U.N.’s Sustainable Development Goals for 2030 are underpinned by chemistry and materials science problems that cannot be solved by advances in classical computing alone. The first applications for quantum computing may be modeling catalytic systems to discover more efficient catalysts for carbon fixation to help combat climate change, identifying sustainable production methods for fertilizer, or developing cleaner combustion.

The future impact of quantum computing on these fields cannot be understated, yet no country or company will be able to achieve these milestones alone. Realizing the full potential of quantum computing will require global partnerships across governments, industry, academia, and NGOs to not only build quantum computing systems, but to also develop high-impact applications and use cases to help solve previously intractable problems in chemistry and materials science.

Today, the Geneva Science and Diplomacy Anticipator (GESDA) and CERN launched the Open Quantum Institute to bring together countries with and without quantum capabilities to build an inclusive, global quantum ecosystem. The OQI is a forum for science diplomacy dialogue with more than 20 countries on relevant themes including standardization, human agency and capital, environmental impact, equity and inclusivity, and implications of the dual-use nature of the technology.

The OQI bridges quantum R&D stakeholders and U.N. organizations to explore applications of quantum computing for the U.N. 2030 agenda, while also providing education and access to quantum devices to underserved geographies. Multilateral governance plays a key role in ensuring the safe deployment of these global activities at scale. We are proud to support the OQI on its mission to ensure that quantum technologies benefit all of humanity.

By acting globally to understand and address the risks together, especially with partners who share our vision, we can safely embrace the promise of advanced classical computing, like HPC and AI, and future quantum computing systems. The OQI demonstrates the promise of global cooperation towards that goal.

Learn more about quantum computing

• Read more about responsible computing and the societal impact of quantum computing.
• Read more about the Open Quantum Institute .
• Discover more about the Geneva Science and Diplomacy Anticipator (GESDA).
• Learn about our recent materials discovery with PNNL.
• Visit Microsoft’s quantum roadmap .
• Learn more about our commitment to quantum-safety .

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CERN Accelerating science

Opening hours

CERN Science Gateway is open from Tuesday to Sunday

• Exhibitions and other activities from 09.00 to 17.00
• Last entry at 16.30
• Reception, Shop and Big Bang Café from 8.30 a.m. to 17.30 

Exceptional closures 

CERN Science Gateway will be exceptionnaly closed on the following days:

• Tuesday 1 October 2024
• Wednesday 2 October 2024
• Tuesday 24 December 2024
• Wednesday 25 December 2024
• Tuesday 31 December 2024
• Wednesday 1 January 2025
• Saturday 4 January 2025
• Sunday 5 January 2025

Reduced programme 

There won't be any guided tours on the following periods:

• From Saturday, 21 December 2024 to Sunday, 5 January 2025 inclusive