by David Lee (Imperial College)
The next generation of hadron accelerators (SLHC, the Neutrino Factory, megawatt neutron sources) require high-brightness injectors that are unavailable today. As the beam brightness is increased, activation of the accelerator must also be kept to a minimum (i.e. uncontrolled losses at levels less than 1W/m). To be able to do this, knowledge of beam emittance and the beam halo is of the upmost importance. So, in parallel to the advances in accelerator physics required for the next-generation of high-brightness injectors it is also necessary to develop new instruments to diagnose the beams produced. Non-intrusive beam diagnostics are increasingly popular with laser-based diagnostics proving a promising way of meeting the upcoming needs.
In this talk I will first introduce the Front End Test Stand (FETS) - the UK's contribution to the development of the next generation of injectors - and motivate non-intrusive beam diagnostics. I will then discuss the principle of laser-based beam diagnostics for H- beams, using the FETS diagnostics as an example before focussing on the design and status of the FETS laser-based profile measuring diagnostic.