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

Lead Research Organisation: University of Oxford
Department Name: Oxford Physics

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 Facility, 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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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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Holloway JA (2017) Brilliant X-rays using a Two-Stage Plasma Insertion Device. in Scientific reports

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

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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

 
Description We have continued the development of the photon acceleration diagnostic instrument. It has been refined to allow full integration with the 10-metre long plasma cell that will be used in the funded AWAKE experiment at CERN. This has been done by incorporating the instrument into the engineering design, in principal. It will be deployed in the second stage of the project starting 2020/21, STFC follow-on funding permitting.
Exploitation Route The diagnostic can be ported to any beam-driven plasma wakefield experiment in future.
Sectors Aerospace, Defence and Marine,Digital/Communication/Information Technologies (including Software),Education,Energy,Healthcare

URL http://www.cern.ch/awake
 
Description We have filed a patent for a new spectrometer. It could lead to a new product and company. The work has been written up and published in Physical Review Special Topics - Accelerators and Beams with further publications immenient in that journal. We have taught a cohort of PhD students on this topic and have trained them in cutting edge experimental laser-plasma interaction physics, high performance computing and analytical modelling. This skill set is high demand across academia and industry.
First Year Of Impact 2014
Sector Digital/Communication/Information Technologies (including Software),Education,Other
Impact Types Cultural,Societal,Economic

 
Description High Power Laser Facility Access
Amount £0 (GBP)
Funding ID 15210000 
Organisation Rutherford Appleton Laboratory 
Department Central Laser Facility
Sector Public
Country United Kingdom
Start 06/2016 
End 11/2016
 
Description AWAKE collaboration experiment in CERN 
Organisation Cockcroft Institute
Country United Kingdom 
Sector Academic/University 
PI Contribution This project is led by University College London. We are investigating the use of photon acceleration as a diagnostic for large amplitude plasma wave amplitude and structure.
Collaborator Contribution This collaboration is preparing a proof of concept experiment of plasma wave generation using a proton beam as a driver.
Impact We have developed a new ultra-bright X-ray source by scaling this concept from CERN to the Diamond Light Source at the Rutherford Appleton Laboratory.
Start Year 2010
 
Description AWAKE collaboration experiment in CERN 
Organisation European Organization for Nuclear Research (CERN)
Country Switzerland 
Sector Public 
PI Contribution This project is led by University College London. We are investigating the use of photon acceleration as a diagnostic for large amplitude plasma wave amplitude and structure.
Collaborator Contribution This collaboration is preparing a proof of concept experiment of plasma wave generation using a proton beam as a driver.
Impact We have developed a new ultra-bright X-ray source by scaling this concept from CERN to the Diamond Light Source at the Rutherford Appleton Laboratory.
Start Year 2010
 
Description AWAKE collaboration experiment in CERN 
Organisation Imperial College London
Country United Kingdom 
Sector Academic/University 
PI Contribution This project is led by University College London. We are investigating the use of photon acceleration as a diagnostic for large amplitude plasma wave amplitude and structure.
Collaborator Contribution This collaboration is preparing a proof of concept experiment of plasma wave generation using a proton beam as a driver.
Impact We have developed a new ultra-bright X-ray source by scaling this concept from CERN to the Diamond Light Source at the Rutherford Appleton Laboratory.
Start Year 2010
 
Description AWAKE collaboration experiment in CERN 
Organisation Lancaster University
Country United Kingdom 
Sector Academic/University 
PI Contribution This project is led by University College London. We are investigating the use of photon acceleration as a diagnostic for large amplitude plasma wave amplitude and structure.
Collaborator Contribution This collaboration is preparing a proof of concept experiment of plasma wave generation using a proton beam as a driver.
Impact We have developed a new ultra-bright X-ray source by scaling this concept from CERN to the Diamond Light Source at the Rutherford Appleton Laboratory.
Start Year 2010
 
Description AWAKE collaboration experiment in CERN 
Organisation Rutherford Appleton Laboratory
Department Central Laser Facility
Country United Kingdom 
Sector Public 
PI Contribution This project is led by University College London. We are investigating the use of photon acceleration as a diagnostic for large amplitude plasma wave amplitude and structure.
Collaborator Contribution This collaboration is preparing a proof of concept experiment of plasma wave generation using a proton beam as a driver.
Impact We have developed a new ultra-bright X-ray source by scaling this concept from CERN to the Diamond Light Source at the Rutherford Appleton Laboratory.
Start Year 2010
 
Description AWAKE collaboration experiment in CERN 
Organisation University College London
Country United Kingdom 
Sector Academic/University 
PI Contribution This project is led by University College London. We are investigating the use of photon acceleration as a diagnostic for large amplitude plasma wave amplitude and structure.
Collaborator Contribution This collaboration is preparing a proof of concept experiment of plasma wave generation using a proton beam as a driver.
Impact We have developed a new ultra-bright X-ray source by scaling this concept from CERN to the Diamond Light Source at the Rutherford Appleton Laboratory.
Start Year 2010
 
Description AWAKE collaboration experiment in CERN 
Organisation University of Liverpool
Country United Kingdom 
Sector Academic/University 
PI Contribution This project is led by University College London. We are investigating the use of photon acceleration as a diagnostic for large amplitude plasma wave amplitude and structure.
Collaborator Contribution This collaboration is preparing a proof of concept experiment of plasma wave generation using a proton beam as a driver.
Impact We have developed a new ultra-bright X-ray source by scaling this concept from CERN to the Diamond Light Source at the Rutherford Appleton Laboratory.
Start Year 2010
 
Description AWAKE collaboration experiment in CERN 
Organisation University of Manchester
Country United Kingdom 
Sector Academic/University 
PI Contribution This project is led by University College London. We are investigating the use of photon acceleration as a diagnostic for large amplitude plasma wave amplitude and structure.
Collaborator Contribution This collaboration is preparing a proof of concept experiment of plasma wave generation using a proton beam as a driver.
Impact We have developed a new ultra-bright X-ray source by scaling this concept from CERN to the Diamond Light Source at the Rutherford Appleton Laboratory.
Start Year 2010
 
Description AWAKE collaboration experiment in CERN 
Organisation University of Strathclyde
Country United Kingdom 
Sector Academic/University 
PI Contribution This project is led by University College London. We are investigating the use of photon acceleration as a diagnostic for large amplitude plasma wave amplitude and structure.
Collaborator Contribution This collaboration is preparing a proof of concept experiment of plasma wave generation using a proton beam as a driver.
Impact We have developed a new ultra-bright X-ray source by scaling this concept from CERN to the Diamond Light Source at the Rutherford Appleton Laboratory.
Start Year 2010
 
Description International Year of Light 
Form Of Engagement Activity Participation in an activity, workshop or similar
Part Of Official Scheme? No
Geographic Reach National
Primary Audience Professional Practitioners
Results and Impact International Year of Light Launch Event, St James Palace, London
Year(s) Of Engagement Activity 2015
URL http://light2015.org.uk/international-year-of-light-launched-in-the-uk/
 
Description Open Days Harwell Campus 
Form Of Engagement Activity Participation in an open day or visit at my research institution
Part Of Official Scheme? No
Geographic Reach National
Primary Audience Schools
Results and Impact I helped with the Open Days at STFC Rutherford Appleton Laboratory
Year(s) Of Engagement Activity 2015
URL http://www.stfc.ac.uk/info/science-up-close-harwell-open-days/general-public-access-day/