So-called 'wake fields' occur during the process of acceleration and can cause particles to fly apart.
The particles are travelling at extremely high energies – and if they are subjected to these wake fields, they can easily destroy the accelerators.
In his paper 'Wake field Suppression in High Gradient Linacs for Lepton Linear Colliders', accelerator physicist Professor Roger Jones examines research into the suppression of these wake fields.
The challenge, he says, is finding a way to suppress wake fields sufficiently while still maintaining a high acceleration field to perform particle collisions.
Prof Jones said: "Wake fields have been carefully controlled and suppressed in the Large Hadron Collider (LHC) at CERN. However, physicists are now looking at what comes after the LHC.
"An electron-positron collider is the natural successor to the LHC and it turns out the wake fields are much more severe in these linear collider machines.
"Indeed, acceleration of particles to ultra-relativistic energies over several tens of kilometres in the proposed Compact Linear Collider (CLIC), for example, poses several significant accelerator physics challenges to designers of these immense machines.
"Beams consisting of several hundred bunches of tightly focussed charged particles can readily excite intense wake fields, forcing the bunches to fly apart."
In his conclusions, Prof Jones suggests two approaches to mitigate for the effects of these extreme wake fields.
One approach entails heavy damping, in which the majority of the wake field is sucked out of the collider by structures, known as waveguides, coupled to each cell in the accelerator.
A second approach entails light damping - in which a small portion is removed - in combination with detuning the cell frequencies of the accelerator.
Prof Jones adds: "Detuning the wake field can be understood by thinking about acoustics. If you have a collection of huge bells all ringing at slightly different frequencies or tones, the amplitude or 'wave height' of the overall sound heard will be markedly smaller than that heard if they all ring at the same tone. This method is very efficient and structures built in this manner are known as a Damped Detuned Structures (DDS).
"Detuning is perhaps more elegant than heavy damping as it also enables the position of the beam to be determined by the quantity of wake fields radiated by the beam – in this way a DDS accelerator removes the wake fields and has its own built-in diagnostic."
The DDS concept was developed by Prof Jones and colleagues during one and a half decades spent working at the SLAC National Laboratory at Stanford University in the United States.
Whilst at the University of Manchester, he has recently developed this method to apply to the CLIC 3 TeV centre of mass collider being developed at CERN. More than 143,000 of these accelerating structures will be needed for the CLIC.
Prof Jones added: "At this stage, both means of wake field suppression should be pursued in order to thoroughly assess their applicability. Experimental testing, using realistic pulse lengths and at the high gradients planned for the linear collider, will be the final test on the suitability of these techniques."
Prof Jones has undertaken research into wake field suppression over the last 20 years – the last four of which have been spent at The University of Manchester's School of Physics and Astronomy and at The Cockroft Institute of Accelerator Science and Technology, based at the Daresbury Laboratory in Cheshire..
Prof Jones' review article is due to be published online in 'Physical Review Special Topics - Accelerators and Beams' on Monday 5 October.
The Cockroft Institute (www.cockroft.ac.uk) was officially opened in September 2006 and is an international centre for Accelerator Science and Technology (AST) in the UK. It is a joint venture of Lancaster University, the Universities of Liverpool and Manchester, the Science and Technology Facilities Council (STFC) and the North West Development Agency (NWDA). The Institute is located in a purpose-built building on the Daresbury Laboratory campus and in centres in each of the participating universities. For more information see www.cockroft.ac.uk.
The proposed CLIC (Compact Linear Collider) at CERN is an electron-positron collider that would allow physicists to explore a new energy region beyond the capabilities of today's particle accelerators. It would provide significant fundamental physics information even beyond that available from the LHC, offering a unique combination of high energy and experimental precision. For more information visit www.cern.ch
23.01.2018 | Physikalisch-Technische Bundesanstalt (PTB)
New for three types of extreme-energy space particles: Theory shows unified origin
23.01.2018 | Penn State
Physicists have developed a technique based on optical microscopy that can be used to create images of atoms on the nanoscale. In particular, the new method allows the imaging of quantum dots in a semiconductor chip. Together with colleagues from the University of Bochum, scientists from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute reported the findings in the journal Nature Photonics.
Microscopes allow us to see structures that are otherwise invisible to the human eye. However, conventional optical microscopes cannot be used to image...
On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.
We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
23.01.2018 | Life Sciences
23.01.2018 | Earth Sciences
23.01.2018 | Physics and Astronomy