Laser based Beam Diagnostics for the RAL Front End Test Stand

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.