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Using remote experimentation in a large undergraduate course: initial findings
Costa-Lobo, Cristina; Alves, Gustavo R.; Marques, Maria A.; Viegas, C.; Barral, R. G.; Couto, R. J.; Jacob, F. L.; Ramos, C. A.; Vilão, G. M.The use of remote labs in undergraduate courses has been reported in literature several times since the mid 90's. Nevertheless, very few articles present results about the correspondent learning gains obtained by students, and in what conditions those systems can be more efficient, thus suggesting a lack of data concerning their pedagogical effectiveness. This paper addresses such a gap by presenting some initi...
Using VISIR in a large undergraduate course: preliminary assessment results
Alves, Gustavo R.; Marques, Maria A.; Viegas, C.; Costa-Lobo, Cristina; Barral, R. G.; Couto, R. J.; Jacob, F. L.; Ramos, C. A.; Vilão, G. M.The use of remote labs in undergraduate courses has been reported in literature several times since the mid 90's. Nevertheless, very few articles present results about the learning gains obtained by students using them, especially with a large number of students, thus suggesting a lack of data concerning their pedagogical effectiveness. This paper addresses such a gap by presenting some preliminary results conc...
Xenon GPSC high-pressure operation with large-area avalanche photodiode readout
Coelho, L. C. C.; Lopes, J. A. M.; Covita, D. S.; Conceição, A. S.; Santos, J. M. F. dosThe performance of a xenon high-pressure gas proportional scintillation counter (GPSC) instrumented with a large area avalanche photodiode (LAAPD) as the VUV-photosensor has been investigated for filling pressures from 1 up to 10 bar, for 22- and 60-keV photons. The LAAPD photosensor is placed directly within the xenon envelope, as a substitute for the photomultiplier tube, avoiding the constraints of the use o...
High-pressure operation of a xenon-GPSC/MSGC hybrid detector for hard X-ray spe...
Coelho, L. C. C.; Veloso, J. F. C. A.; Covita, D. S.; Ferreira, L. F. Requicha; Santos, J. M. F. dosThe performance of a high-pressure xenon gas proportional scintillation counter/microstrip gas chamber (GPSC/MSGC) hybrid detector has been investigated for filling pressures from 1 up to 10 bar, for 22-, 30- and 60-keV photons. GPSC/MSGC hybrid detectors are based on a xenon-GPSC instrumented with a CsI-coated microstrip plate photosensor placed directly within the xenon envelope, as a substitute for the photo...
Planar LAAPDs: temperature dependence, performance, and application in low-ener...
Ludhova, L.; Amaro, F. D.; Antognini, A.; Biraben, F.; Cardoso, J. M. R.; Conde, C. A. N.; Covita, D. S.; Dax, A.; Dhawan, S.; Fernandes, L. M. P.An experiment measuring the 2S Lamb shift in muonic hydrogen ([mu]-p) was performed at the Paul Scherrer Institute, Switzerland. It required small and compact detectors for 1.9 keV X-rays (2P-1S transition) with an energy resolution around 25% at 2 keV, a time resolution better than 100 ns, a large solid angle coverage, and insensitivity to a 5 T magnetic field. We chose Large Area Avalanche Photodiodes (LAAPDs...
The X-ray performance of a driftless gas proportional scintillation counter usi...
Covita, D. S.; Simões, P. C. P. S.; Fernandes, L. M. P.; Freitas, E. D. C.; Ferreira, L. F. Requicha; Veloso, J. F. C. A.; Santos, J. M. F. dosPerformance characteristics are evaluated for a xenon driftless gas proportional scintillation counter (GPSC), for which detector pulses are formatted using very short shaping-time constants (~50 ns), and directly analyzed by the MCA without previous pulse time duration analysis and amplitude correction. The present detector and method allow the achievement of detector energy linearity and energy resolution sim...
A new method for pulse analysis of driftless-gas proportional scintillation cou...
Simões, P. C. P. S.; Covita, D. S.; Veloso, J. F. C. A.; Santos, J. M. F. dos; Morgado, R. E.A new method for pulse analysis of driftless-gas proportional scintillation counters (GPSCs) is presented. With this method the requirement for additional analog or digital signal time-analysis and pulse-amplitude correction currently used is eliminated. In contrast to conventional- and driftless-GPSCs that have always relied on long shaping-time constants (several [mu]s), the use of very short linear amplifier...
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