New: The CLIC 2018 Summary Report

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In summary, the Compact Linear e+e- Collider (CLIC) is a proposed accelerator that would collide electrons and positrons at higher energies than previous colliders. It utilizes a linear design and two beams to achieve high accelerating gradients. The proposed three-stage project has collision energies of 0.38 TeV, 1.5 TeV, and 3 TeV with corresponding tunnel lengths of 11 km, 29 km, and 50 km. This would allow for a physics program beyond what other proposals could achieve, but it is also more expensive. The paper discusses the technical challenges and civil engineering requirements for the project. Overall, CLIC has the potential to be an exciting project, but there are still obstacles to overcome
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New: The Compact Linear ##e^+e^−## Collider (CLIC) -- 2018 Summary Report

CLIC is a proposed accelerator, potentially at CERN, that would collide electrons and positrons at energies far above what previous colliders achieved. Its overall energy would still be below the LHC but (unlike at the LHC) all the collision energy is available for the creation of new particles - it would combine the approximate energy reach of the LHC with the cleanliness of elementary particle collisions.

To achieve this energy the collider has to be linear (synchrotron radiation doesn't allow circular designs), to keep the tunnel length reasonable it needs very high accelerating gradients. State of the art are superconducting RF cavities achieve ~35 MeV/m - but that would need more than 100 km of tunnel to reach the proposed 3 TeV collision energy. To get higher gradients CLIC uses two beams: A low energy high current beam creates strong electromagnetic waves that drive a high energy low current beam. That should lead to an accelerating gradient of at least 70 MeV/m, potentially as high as 100 MeV/m. The full accelerator would still need a tunnel length of 50 km with 70 MeV/m - acceleration, focusing, pumps and other infrastructure. The focusing system around the collision point alone needs two kilometers for each beam.

You don't start with a 50 km tunnel, so the CLIC proposal has three stages with collision energies of 0.38 TeV, 1.5 TeV and 3 TeV with tunnel lengths of 11 km, 29 km, 50 km. The first stage would produce Higgs bosons (##e^-e^+ \to Z^* \to HZ##) and top quark pairs close to the threshold. A great way to study them in more detail, including much better mass measurements. W and Z bosons would be produced often as well. The second stage gives more Higgs bosons and more production modes (including (##e^-e^+ \to t\bar t H##). It would also give events with two Higgs bosons and some chance to produce new particles that escaped detection at the LHC. The third stage gives access to Higgs self-coupling (something very challenging to measure at the LHC) and a larger energy to look for undiscovered particles. In addition most interesting processes that happen at lower energies will be more common.

A nice physics program significantly beyond what the ILC proposal with its lower energy and the Chinese proposal with its much lower energy (just enough for the ZH process) would do. Unfortunately it looks more expensive, too. The paper estimates $6B for the first stage, $5B upgrade cost to the second stage and further $7B for stage three (all in 2018 CHF = 2018 dollars). That would make it even more expensive than the LHC. Unlike the LHC the CLIC design only allows one detector at the single collision point.
 
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The paper also discusses the technical challenges that have to be overcome, the beam dynamics and the design of the RF structure to reach the desired accelerating gradient. It also goes into some detail what the civil engineering requirements for the tunnel and other infrastructure would be.In short: CLIC has the potential to become a very exciting project with an interesting physics program, but it is significantly more expensive than previous collider proposals. The paper summarizes the status of the accelerator design and the challenges that still have to be overcome.
 

What is the purpose of the CLIC 2018 Summary Report?

The purpose of the CLIC 2018 Summary Report is to provide an overview of the key findings and developments discussed at the CLIC 2018 conference. This report serves as a resource for those interested in the latest research and advancements in the field.

Who is the intended audience for the CLIC 2018 Summary Report?

The intended audience for the CLIC 2018 Summary Report includes scientists, researchers, and industry professionals in the fields of climate change and sustainability. This report may also be of interest to policymakers and the general public.

What are the main topics covered in the CLIC 2018 Summary Report?

The main topics covered in the CLIC 2018 Summary Report include the latest research on climate change and its impacts, sustainable practices and technologies, and strategies for mitigating and adapting to the effects of climate change.

Are there any key takeaways from the CLIC 2018 Summary Report?

Yes, the CLIC 2018 Summary Report highlights several key takeaways from the conference, including the urgent need for global action on climate change, the importance of incorporating sustainability into all industries, and the potential benefits of embracing renewable energy sources.

Is the information in the CLIC 2018 Summary Report peer-reviewed?

While the content of the CLIC 2018 Summary Report is based on presentations and discussions at the conference, it is not a peer-reviewed publication. However, the report does include references to published scientific studies and research from reputable sources.

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