RESUMEN
A movable Allison type emittance scanner is being developed to characterize the phase-space distribution of the beamlets of spectral phase interferometry for direct electric-field reconstruction, the prototype RF negative ion source of the ITER heating neutral beam injector. To test the electronics and verify the capability of the device to resolve nearby beamlets, a compact RF ion source prototype has been set up, capable of accelerating 1 mA of helium ions up to a voltage of 2 kV. A commercial 100 W RF generator creates a plasma inside a Pyrex tube, with a density between 1015 and 1016 m-3 and an electron temperature up to 15 eV. Three multi-aperture grids in accel-decel configuration extract and accelerate the ions, which are measured with a Faraday cup. We present in this paper the characterization of the ion source and its first operation, showing that it is suitable for the commissioning of the Allison scanner.
RESUMEN
Fourty patients who underwent general surgery have been enrolled in a double-blind controlled trial which evaluated the efficacy and safety of Fragmin, a new low molecular weight heparin, chosen to be the 1st OMS International Standard for LMWH. Fragmin 2500 UI anti-Xa once daily and unfractionated heparin 5000 UI twice daily were administered to prevent postoperative deep venous thrombosis. Prophylaxis began two hours before surgery and continued for the next 5 postoperative days. The incidence of isotopic venous thrombosis, thromboembolic disorders and bleeding complications have been evaluated. Results have shown a similar efficacy and safety profile of the two drugs, although Fragmin doses are markedly inferior to unfractionated heparin's. Moreover, Fragmin has the advantage of a single daily administration, with a better patients' compliance and an easier and less expensive nursing care.