[en] The aim of this paper is to present the project of the Brazilian Synchrotron Light Source. Technical issues will be raised on the scientific relevance and importance of a synchrotron light source. The author focuses his attention on the specific points of the Brazilian project

No abstract available

[en] The authors present an operation mode with very small momentum compaction factor for the LNLS UVX electron storage ring under construction in Campinas, Brazil. They establish conditions for longitudinal single particle stability in this quasi-isochronous mode including second order longitudinal and transverse effects. The results indicate that it is possible to operate this ring with the momentum compaction reduced by a factor of 100 with respect to the normal operation mode

[en] The initial project of LNLS contemplated the construction of a 2 GeV electron storage ring to be dedicated to the production of synchrotron light. A recent revision of the project involves the construction of a 1.15 GeV electron storage ring as a first step. This paper discusses to what extent this modification may affect the planning for the construction of experimental work-stations and related instrumentation. The addition of wiggler insertions was decided upon so as to maintain most of the scientific planning elaborated for the initial LNLS project. (author)

[en] The construction of light line for spectral range from 12 to 310 eV of Laboratorio Nacional de Luz Sincrotron (LNLS) is presented. The basic parameters of light line are shown. The components of UHV constructed in the LNLS considering installation aspects and final results are exposed. (M.C.K.)

No abstract available

[en] In experiences carried out recently in National Laboratory of Synchrotron light, LNLS, x rays diffraction diagrams of samples of zircaloy-4 irradiated with neutrons has been obtained. These samples were taken of a cooling channel removed of the Atucha 1 Nuclear Reactor -Argentina - after 10.3 years of operation to full power. Due to the pick up of hydrogen that it produced during their permanency in the reactor these samples contain around 180 ppm of hydrogen/deuterium. The diffraction diagrams obtained in samples of zircaloy-4 not irradiated of similar characteristics allow to observe with clarity the picks corresponding to the planes <111>δ and <200>δ, those more intense of the phase δ-hydrure, even for concentrations so low as 20 ppm. The intensity of the beam and the good relationship pick-bottom has allowed to quantify contents of hydrogen in the not irradiated samples used as reference in this work. The line <111>δ and <200>δ observed in the irradiated samples, reheating to 400 and 600^oC, indicates a recovery of the crystalline structure of the hydrure regarding the material 'as received' and an increase of the area under the picks, related directly with the quantity of hydrure phase present in the sample. These observations endorse the hypothesis of traps of hydrogen outlined in previous works (IE)

No abstract available

[en] A new, high-precision, low-ripple current power supply (CPS) for magnets, based on a combination of an SCR converter and a single transistor switched mode power supply (SMPS) is described. The load power is primarily supplied by the SCR converter. The SMPS handles only a small fraction of the load power, and also, what is more significant, a very small part of the load current. In this paper, the topology and operating principle of the new power supply is discussed. A CPS, rated at 200 A at 45 V, was constructed and tested. The power supply energizes a family of quadrupole magnets at the Brazilian Synchrotron Light Source--LNLS. Making use of the current limit modulation (CLM) control method, magnetic field variations at full current are 5 ppm, with only 8 A passing through the switching transistor. The design and performance of the power supply under different operating conditions ar described. Variations of the proposed topology, suitable for high-current and high-voltage loads, are also discussed

[en] The ion clearing system for the LNLS 1.15 GeV electron storage ring is composed of 54 vertical field electrodes in the straight sections and 12 horizontal field electrodes located inside the dipole vacuum chambers. The latter do not clear ions directly but rather produce large longitudinal cross-field velocities towards the ends of the dipole where ions are removed with vertical field electrodes. Electrode geometry, position and voltage are specified according to the variation of the beam potential well depth along the machine, of the expected longitudinal ion velocity, of the allowable residual neutralization and of the electron orbit perturbation due to clearing electrodes. (author) 6 refs.; 5 figs.; 5 tabs