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We implemented a didactic experiment to study the angular correlation between the two gamma rays emitted in typical $^{60}$Co radioactive decays. We used two NaI(Tl) scintillators, already available in our laboratory, and a low-activity $^{60}$Co source. The detectors were mounted on two rails, with the source at their center. The first rail was fixed, while the second could be rotated around the source. We performed several measurements by changing the angle between the two scintillators in the range from $90^\circ$ to $180^\circ$. Dedicated background runs were also performed, removing the source from the experimental setup. We found that the signal rate increases with the angular separation between the two scintillators, with small discrepancies from the theoretical expectations., 15 pages, 12 figures

In this article we discuss the measurement of the field profile in the sustained spheromak physics experiment (SSPX). We have built a transient internal probe (TIP) diagnostic to measure the internal field profile in a SSPX plasma sustained by dc coaxial helicity injection. TIP is a diagnostic that makes a spatially resolved (i.e., not chord averaged) measurement of the local magnetic field using Faraday rotation. A 1-cm by 4-mm-diameter verdet probe is fired through the plasma at about 2 km/s by a two-stage light gas gun. The probe is illuminated by an argon ion laser throughout the traverse of the plasma—the retro-reflected light is then analyzed with an ellipsometer to determine the field at each location. The speed, small size of the probe, and the probe cladding make this measurement possible even in hot plasmas (100 s of eV). The measurement is accurate enough (1 MHz, ±7 G, 1-cm spatial resolution) to map out magneto hydrodynamic (MHD) mode amplitudes from the edge to the magnetic axis.

During many years the produced gas from Eastern Venezuela reservoirs has been one of the most important energy sources for the Venezuela internal domestic market. To support the new gas business vision, this region has in only three fields (San Joaquin / El Roble / Guario) potential gas reserve in the order of 13 MMMMSCF in 670 reservoirs. Surely, it will provide essential support and play an important role for investment to supply the necessary gas volumes for the market. This paper, is a case study of the results obtained in the integrated study elaboration which was initiated in the RPN-24 reservoir, Merecure G sand, Roble field. The field is located geologically in the northwestern block of the Anaco thrust. Using available technologies, the revision of the data (seismic, geological and production behavior) detected the existence of a hydraulic unit with both areal and vertical comunication with other three Oligocene reservoirs. The multidisciplinary integrated study of these mature gascondensate reservoirs revised, the existent structural model of the three cited fields, with good results. These results, through both static and dynamic model integration, identified the coalescence of four reservoirs into an unique hydraulic unit. This integrated team process increased the GCOES to 232 MMMSCF with an average yield of 46 barrels of liquid per each MMSCF gas. Additionally, it will improve the operational process and the effective control of reservoirs by increasing the recoverable reserves. The appropiate use of 2D seismic and the use of conventional reservoir analysis methods are always a great tool to work out studies in mature reservoirs through the application of team sinergy.