On November 28, 2008 we, VG dell'ISSG Mazzini, we visited the university complex of Mount St. Angelo, via Cintia located. The aim of the visit was to make a first approach to the university world, and to receive some clarifications about the various faculties offered by the University Federico II.
The first part of the visit took place within a research office, where we have had discussions with a professor of astrophysics attitudes about our university and our doubts, the comparison has been very constructive and interesting because we have been given a complete overview of the university and how it changes the lifestyle of the student from high school to college. Later we went to a lab where we study and monitor the behavior of the system VIRGO: this is a Michelson interferometer with long arms 3 k m , located in the municipality of Cascina ( PI). The construction equipment was completed in 2003 . The project's aim is to reveal the gravitational waves in a wide range of observable frequencies between 10 Hz and 6000 . Such precision will see the effects of supernovae and binary systems located in ' Virgo cluster (hence the name of the project). The project uses a high precision laser prestabilizzato, this sends a laser beam that is split and sent in the two arms of the complex. The beams are bounced 50 times before being recombined to identify the differences.
We then went to another room in the laboratory, where we saw a demonstration on a small scale, the Michelson interferometer, using a laser source with monochromatic red light. The Michelson interferometer is the most common type of interferometer and is named after its inventor, Albert Abraham Michelson . A interference pattern is obtained by dividing routed on different paths and a beam of photons and doing it again converge. The two pathways must have different lengths, or may be different materials, so that it is a considerable lag in optical path of the beams divided. Of the two different light beams (equally likely paths for the single photon) is a reflection by the semi-reflective mirror , arrives on a mirror at the top, from which it is reflected and, through the semi-reflective mirror, she meets the detector. The second beam passes through the mirror first instead of mirrors, and is subsequently reflected in the detector. Two other beams do not converge on the detector, and are therefore not taken into account. If the paths differ by integers wavelengths , the ' constructive interference generates a strong output signal. For difference equal to an odd number of half-lengths wavelength, the interference is destructive and the signal is close to zero.
In conclusion, we would like to sincerely thank all staff who accompanied us during the visit, especially the professor with whom we have had the initial discussion about the academic orientation, which proved to be certainly more constructive conversations that usually you can get. Demonstrations also were particularly exciting because the interaction between our technicians and students.
Naples, 12/03/2008
Class VG, ISSG Mazzini, Naples
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