Proton-driven plasma wakefield acceleration---a new route to a TeV e+e- collider

Lead Research Organisation: University College London
Department Name: Physics and Astronomy

Abstract

Over the last fifty years, accelerators of ever increasing energy and size have allowed us to probe the fundamental structure of the physical world. This has culminated in the Large Hadron Collider at CERN, Geneva, a 27-km long accelerator which hopes to discover new particles such as the Higgs Boson or new phenomena such as Supersymmetry. Using current accelerator technology, a next collider such as a linear electron-positron collider would 30-50 km long which would require immense investment. As an alternative, we are pursuing a new ultra-compact technology which would allow a reduction by about a factor of ten in length and hence would reduce the cost by a significant fraction.

The idea presented here is to impact a high-energy proton beam, such as those at CERN, into a plasma. The free, negatively-charged electrons in the plasma are knocked out of their position by the protons, but are then attracted back by the positively-charged ions, creating a high-gradient electric "wakefield" and an oscillating motion is started by the plasma electrons. Experiments have already been carried out impacting lasers or an electron beam onto a plasma and accelerating gradients have been observed which are 1000 times higher than conventional accelerators. Given the much higher initial energy of available proton beams, it is anticipated that the electric fields it creates in a plasma could accelerate electrons in the wakefield up to the teraelectron-volts scale required for a future collider, but in a single stage and with a length of a few km. Such a collider is, however, many years in the future and test experiments are first needed.

A first proof-of-principle experiment will be performed at CERN over the next 5 years. The experiment will use a high-energy proton beam to impact on a plasma cell of about 10 m and measure the energy change in a bunch of electrons which will travel behind the proton beam. Observing significant energy changes in the electrons would demonstrate the concept of this form of acceleration which has so far only been studied in simulation.

The UK has seven groups (ASTeC, Central Laser Facilities, Cockcroft Institute, Imperial College, John Adams Institute, Strathclyde and UCL) in the collaboration preparing for this test experiment in CERN. We propose a programme to answer various technical issues and develop a wide-range of instrumentation which will the allow us to successfully build the test experiment. A crucial part is being able to build a plasma cell with a uniform density over lengths much longer than previously tried. We will also design the electron particle source to be fired into the plasma at exactly the right time so as to feel the largest possible accelerating gradient in the wakefield created by the proton beam. To determine the success of the experiment, we will design diagnostic tools which will measure the size of the wakefield and the energy and spatial profile of the electron beam after it has been accelerated in the plasma. Finally, our results will improve simulations of plasma wakefields to give us more confidence in our expectations of a larger-scale experiment and help us best optimise its layout and capabilities.

If successful, this experiment will lead to a further larger-scale project to accelerate bunches of electrons of small spatial extent with high particle numbers and ultimately a new form of acceleration which could lead to future, energy-frontier particle physics experiments. This technique has the potential to radically alter the frontier of high energy physics with accelerators as performant as currently planned or required, but at a tenth of the length and hence cost. With the significantly larger acceleration gradients and smaller spatial extent, plasma-based accelerator technology could also lead to vastly smaller synchrotron light sources which probe the structure of e.g. proteins and table-top accelerators of lower energy for use in hospitals or industry.

Planned Impact

This project is naturally a multi-disciplinary pursuit involving accelerator, plasma and particle physicists as well as engineers and technical staff. If successful, this method of acceleration could provide a new cost-effective route to a TeV-scale electron-positron linear collider. This application is for significant development and is wide-ranging in scope. Although equipment will be purchased from UK-based companies, this will initially be small due to the financial limitations of the bid but could increase significantly in the future. As we in the UK are a significant part of this project from the start, should the final goal be realised, there is potential for economic stimulus to the UK which building a large-scale research facility brings. This will involve the potential for large industrial contracts, training for students and other staff and knowledge exchange between academic institutes and industry arising from the R&D and the method of plasma wakefield acceleration.

The final aim of this project is to build an accelerator for investigation of fundamental particles and forces, however, the principle of plasma wakefield acceleration could revolutionise accelerators in general. The accelerating gradients achieved are three orders of magnitude higher than current techniques allowing a corresponding reduction in the size (and cost) of future accelerators. This could then benefit any branch of science, health or industry which uses particle accelerators. An example is for future free electron laser facilities which could benefit significantly from this technique in which the acceleration of electrons takes place using a much shorter accelerating structure.

Diagnostic techniques developed here could benefit many plasma wakefield experiments with different goals or applications. Additionally, the improved simulations of the dynamics of the plasma will aid our understanding of plasmas in general. Therefore the work done here could benefit accelerators planned for other industries using the technique of plasma wakefield acceleration.

Finally, the physics behind the accelerator R&D and the final goal of the next energy-frontier collider will excite future students and captivate the public in much the same was as the Large Hadron Collider has. Having the UK as part of such cutting-edge development in order to be leaders of future experiments on the nature of the physical world is essential and beneficial for society. Any economic impact, as mentioned above, can only be achieved through being a strong partner. And the societal benefit of encouraging students to study physics and improving the general public's knowledge of science can best be achieved if we are part of future pursuits.

Publications

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Muggli P (2018) AWAKE readiness for the study of the seeded self-modulation of a 400 GeV proton bunch in Plasma Physics and Controlled Fusion

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Gschwendtner E (2016) AWAKE, The Advanced Proton Driven Plasma Wakefield Acceleration Experiment at CERN in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

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Bracco C (2016) AWAKE: A Proton-Driven Plasma Wakefield Acceleration Experiment at CERN in Nuclear and Particle Physics Proceedings

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Xia G (2014) Collider design issues based on proton-driven plasma wakefield acceleration in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

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Caldwell A (2016) Path to AWAKE: Evolution of the concept in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

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P. Muggli (2013) Physics of the AWAKE project in Proceedings of IPAC 2013

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Jolly, S. (2014) Proceedings of IPAC2014

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Deacon, L. (2015) Proceedings of IPAC2015

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Caldwell, A (2015) Proceedings of Science

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Wing, M (2014) Proceedings of Science

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Kasim M (2015) Quantitative single shot and spatially resolved plasma wakefield diagnostics in Physical Review Special Topics - Accelerators and Beams

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Kasim M (2015) Simulation of density measurements in plasma wakefields using photon acceleration in Physical Review Special Topics - Accelerators and Beams

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Caldwell A (2016) VHEeP: a very high energy electron-proton collider in The European Physical Journal C

 
Description We have defined the baseline energy spectrometer for the AWAKE experiment. This instrument will measure the energy to which electrons are accelerated using a novel technological scheme.
Exploitation Route Proton-driven plasma wakefield acceleration is really focussed on applications for particle physics. However, work developed for plasma wakefield acceleration as a whole is useful for the whole technology of havin smaller particle accelerators.
Sectors Education,Pharmaceuticals and Medical Biotechnology,Other

 
Description We are still in an R&D phase and future funding is needed to be able to realise proton-driven plasma wakefield acceleration for the first time.
Impact Types Cultural

 
Description AWAKE: a proton-driven plasma wakefield acceleration experiment at CERN
Amount £363,608 (GBP)
Funding ID ST/N001613/1 
Organisation Science and Technologies Facilities Council (STFC) 
Sector Public
Country United Kingdom
Start 10/2016 
End 09/2017
 
Description FP7
Amount € 133,425 (EUR)
Organisation European Research Council (ERC) 
Sector Public
Country Belgium
Start 05/2013 
End 04/2017
 
Description Research Grant
Amount £662,135 (GBP)
Funding ID ST/R002339/1 
Organisation Science and Technologies Facilities Council (STFC) 
Sector Public
Country United Kingdom
Start 10/2017 
End 03/2020
 
Description Research Project Grant
Amount £318,272 (GBP)
Funding ID RPG-2017-143 
Organisation The Leverhulme Trust 
Sector Charity/Non Profit
Country United Kingdom
Start 10/2017 
End 09/2021
 
Description AWAKE Collaboration 
Organisation European Organization for Nuclear Research (CERN)
Country Switzerland 
Sector Academic/University 
PI Contribution Members of AWAKE Collaboration along with about 20 other institutes.
Collaborator Contribution CERN is the lead partner and experiment host.
Impact Development of experiment
Start Year 2009