A thin foil Faraday cup array is being built to measure the loss of 3.5 MeV alpha particlesand MeV ion cyclotron heating (ICH) tail ions on JET. It will consist of nine detectors spread over five different poloidal locations and three radial positions. They willmeasure the poloidal distribution and radial scrape off of the losses. The detectors will be comprised of four layers of thin (2.5 micron) Ni foil, giving some resolution of the lostparticle energy distribution as different ranges of energies will stop in different layers of the detector. One detector will utilize eight thinner (1.0 micron) foils to obtain a better-resolved energy distribution. These detectors will accept particles incident up to 45° from the normal to the foils.