The Institute for Particle Physics Phenomenology is involved with several activities connected with beam development for the Linear Collider.
Beam polarisation is a powerful tool at a future Linear Collider for exploring both new physics as well as testing the Standard Model with unprecedented precision. The Institute for Particle Physics Phenomenology is participating the international working group on all kinds of polarisation issues at a Linear Collider called POWER (POlarisation at Work in Energetic Reactions). POWER addresses physics issues as well as technical questions how to produce the polarised beams, how to measure the polarisation etc.
An interesting and novel problem is the generation of polarised positrons, the antiparticles of the electrons, at a Linear Collider. Several schemes are currently under discussion for the global International Linear Collider (ILC), e.g. to generate polarised positrons via undulator radiation. The IPPP is member at the current E166 project at SLAC which presents a kind of `proof of principles' for this undulator-based scheme.
The physics goals for the currently planned International Linear Collider (ILC) require a very high luminosity, i.e. the availability of a high rates of events. In particular, the ILC requires a large number of positrons, about three orders of magnitude higher per pulse than at the positron source of the Slac Linear Collider (SLC), the only linear collider accelerator that has been built so far and that had its major runs in the mid nineties. To meet such technical challenges three possible kinds of sources (polarized or unpolarized) for the positron particles are under discussion/under development and several prototypes are already under construction. An overview and the current R+D status about the possible positron sources at the ILC is given here.
The UK is actively engaged in producing undulator prototypes for the future Linear Collider at the ASTeC Laboratory at Daresbury. The IPPP is part of the UK LC-ABD working group on the beam delivery design at a future Linear Collider and is particularly involved in the precise anaylsis of depolarisation effects which might occur on the way from the source of the polarised beams to the interaction point at a Linear Collider. For these calculations precession and quantum effects have to be taken into account as well as specific technical machine details. The project is carried out within the UK HeLiCal group in collaboration with the Daresbury Laboratory, and groups at Liverpool University, the Cockcroft Institute, Lancaster University and DESY Hamburg, Germany.