Emittance meter with CEM Initially we had an Allison type emittance meter s - 100V SCANNER CURREN T ± V g L beam L = 70 mm g = 4 mm V = ± 1000 V (KEPCO) Limitations • Could not take a scan for beam currents below 1 nA • between 1-3 nA one had to use reverse bias to take a scan. Upgrade: CEM incorporation Two modes of operation • Channeltron: Low beam intensity~10pA • Faraday cup: Beam intensity > 1nA L = 50 mm g = 2mm V = ± 1000 V (KEPCO)