| Paper |
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| MOPD029 |
Commissioning of the 2,2 kW, 476 MHz Solid State RF Power Source for the LNLS Booster Synchrotron
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511 |
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- C. Pardine, R. H.A. Farias, P. F. Tavares
LNLS, Campinas
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A 2.2 kW, 476 MHz unconditionally stable solid state RF amplifier for CW operation has been built, tested, and is being used since july 2007 at LNLS. The amplifier, designed and developed in collaboration with Synchrotron SOLEIL, is made of 9 modules, each one containing one push-pull 290 W MOSFET equipped with an internal circulator and RF load. Low cost, reliability, linearity and high efficiency are the main features we aimed for in this device, which was developed for the LNLS Booster Injector. In this paper, we present technical characteristics as well as test results of the system.
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| MOPP085 |
Bench Characterization of a Prototype of a 3rd Harmonic Cavity for the LNLS Electron Storage Ring
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748 |
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- R. H.A. Farias, D. A. Nascimento, C. Pardine, P. F. Tavares
LNLS, Campinas
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The UVX electron storage ring at the Brazilian Synchrotron Light Laboratory suffers from longitudinal instabilities driven by a HOM of one of the RF cavities. The operational difficulties related to these unstable modes were successfully overcome by determining the proper cavity temperature set point in combination with phase modulation of the RF fields at the second harmonic of the synchrotron frequency. However, a serious drawback of the method is to increase the energy spread of the electron beam, which is detrimental for the undulator emission spectrum. The use of higher harmonic cavities is a more appropriate technique since it provides damping of the longitudinal modes without increasing the energy spread. A full scale prototype of a 3rd harmonic cavity was manufactured at the LNLS workshops and had its main rf properties measured. Special care was taken to measure the shunt impedance of the fundamental resonant mode since it determines how many cavities will be necessary for the adequate operation of the system, which is designed to operate in passive mode. In this work we present the results of the bench characterization of the cavity.
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| THPC024 |
Closed Orbit Correction at the LNLS UVX Storage Ring
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3029 |
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- L. Liu, R. H.A. Farias, X. R. Resende, P. F. Tavares
LNLS, Campinas
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The orbit correction of stored electrons in the LNLS storage ring often needs a few iterations to converge to the smallest distortion. This is caused in part by the residual coupling between transverse planes. This coupling effect can be included in the correction algorithm leading to the best orbit in just one iteration. However, in the LNLS ring, the number of monitors equals the number of vertical correctors but surpasses the number of horizontal correctors. This means that the vertical orbit can be corrected to zero at the position monitors in the decoupled situation but the horizontal orbit cannot. For the coupled case, the incapacity of zeroing the horizontal orbit leaks into the vertical plane. This problem can be addressed by the eigenvector method with constraints.
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