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Atomic Beam Probe (ABP) is an extension of the routinely used Beam EmissionSpectroscopy (BES) diagnostic for plasma edge current fluctuation measurementat magnetically confined plasmas. Beam atoms ionized by the plasma are directedto a curved trajectory by the magnetic field and may be detected close to thewall of the device. The arrival location and current distribution of the ionscarry information about the plasma current distribution, the density profileand the electric potential in the plasma edge. This paper describes amicro-Faraday cup matrix detector for the measurement of the few microampereion current distribution close to the plasma edge. The device implements ashallow Faraday cup matrix, produced by printed-circuit board technology.Secondary electrons induced by the plasma radiation and the ion bombardment arebasically confined into the cups by the tokamak magnetic field. Additionally, adouble mask is installed in the front face to limit ion influx into the cupsand supplement secondary electron suppression. The setup was tested in detailusing a Lithium ion beam in the laboratory. Switching time, cross talk andfluctuation sensitivity test results in the lab setup are presented, along withthe detector setup to be installed at the COMPASS tokamak.

Micro-Faraday cup matrix detector for ion beam measurements in fusion plasmas