Scintillator-based ion beam profiler for diagnosing laser-accelerated ion beams

Next generation intense, short-pulse laser facilities require new high repetition rate diagnostics for the detection of ionizing radiation. We have designed a new scintillator-based ion beam profiler capable of measuring the ion beam transverse profile for a number of discrete energy ranges. The optical response and emission characteristics of four common plastic scintillators has been investigated for a range of proton energies and fluxes. The scintillator light output (for 1 MeV > Ep < 28 MeV) was found to have a non-linear scaling with proton energy but a linear response to incident flux. Initial measurements with a prototype diagnostic have been successful, although further calibration work is required to characterize the total system response and limitations under the high flux, short pulse duration conditions of a typical high intensity laser-plasma interaction

Equinodermes da região entre o Amapá (Brasil) e a Flórida (E.U.A.) II: echinozoa

The echinozoan species collected by the Exploratory Fishing and Gear Research Base of Pascagoula, Mississipi, U.S.A., between the Southwest region of U.S.A. and the Amapa (Brasil) are listed. The geo graphical distribution of twenty two species is extended. A new species, Thyone pawsoni sp. n., is described