A Scintillating-fiber Beam Profile Monitor for the DAFNE BTF
A scintillating-fiber beam profile detector has been designed, built and tested, for the monitoring of the position and size of the electron beam of the DAFNE, the recently commissioned electron beam-test facility at the Frascati LNF. A description of the detector construction and assembly, together with the results achieved during the 2003-2004 run, are here reported.
Diagnostics and Upgrade of the DAFNE Beam Test Facility (BTF)
The DAFNE Beam Test Facility (BTF), operational in Frascati LNF since November 2002, is a beam transfer line optimized for single particle production, mainly for high-energy detectors calibration. It can provide e − / e + beams in a wide range of intensity – between single particle and 1010 particles/pulse – and energy, from few tens of MeV up to 800 MeV; the pulse duration can also be adjusted between 1 and 10 ns at a maximum repetition rate of 50 Hz. In the last year many groups have accessed the facility, for testing a number of apparata: silicon detectors, calorimeters, scintillator counters, GEM (in single particle mode); fluorescence counters, crystal and nanotube bendings, Cerenkov counters, thermo-acoustical detectors (at high intensity). The large beam multiplicity range required to implement different diagnostic devices: calorimeters for particle counting at low intensity, fluorescence chambers and Cerenkov detectors for intermediate-high intensity monitor, up to standard beam diagnostic systems. The beam spot profile and position is also measured by means of a x-y scintillating fiber hodoscope with multi-anode PMT readout.
Cognitive Correlaretes of Physics Achievement of Some Nigeria Senior Secondary Students
Some cognitive correlates of physics achievement of some Nigeria senior secondary students were considered in the study. Specifically, the study examined the relationship between measures of student’s field independency. Cognitive tasks, formal reasoning and their achievement in physics. Purposive and stratified random sampling techniques were employed to obtain a sample of 524 senior secondary two students from six education zones in Kogi State of Nigeria. Three instruments were used. They are science Reasoning Tasks (SRTs). Group Embedded Figures Test (GEFT) and Physics Achievement Test (PAT). Data analysis using multiple regressions reveals that measures of students’ fields’ independency and cognitive tasks predicted student’s achievement in physics generally. However, only measure of field independency predicted students’ achievement in physics in the higher order cognitive demand questions. Measures of formal reasoning had no significant relationship with students’ achievements in physics generally or in higher order cognitive demand questions in physics. However, the overall relationships between measures of field independency, cognitive tasks, formal reasoning and students’ achievement in physics generally and in higher order cognitive demand questions in physics were both significant. Educational implications of these findings were discussed.