We present results of the commissioning of a new injector for the Brazilian Synchrotron Light Source. The new injector consists of the existing 125-MeV LINAC and a new 500-MeV booster synchrotron. At present, about 40 mA can be injected into the booster and about 15 mA can be ramped up to 500 MeV at a repetition rate of 0.17 Hz. The new injector has allowed the accumulation of up to 540 mA in the main ring at 500 MeV and up to 305 mA has been ramped up to the storage ring nominal energy of 1.37 GeV. The new beam intensity is more than twice as large as the typical stored beam current before the installation of the booster synchrotron.
We present the RF system for the 500-MeV booster of the LNLS synchrotron light source. The heart of the RF system is a home-made narrow-band MOSFET based solid state amplifier which delivers up to 900 W RF power to the 476 MHz Elettra-type RF cavity of the booster. The amplifier is made up of 5 conveniently combined modules, each module being able to deliver up to 230 W at 476 MHz. The system also includes the usual feedback loops for amplitude and phase controls.
We present the results of hardware, software and operational improvements implemented at the injector complex of the 1.37 GeV electron storage ring of the Brazilian Synchrotron Light Source (LNLS) with the aim of improving injector stability and reliability, thus reducing the injection time. The improvements include changes to the 120 MeV injector LINAC RF system and high power modulators, injection automation and the implementation of a new procedure for reusing the current at the end of each user´s shifts before injection by ramping the energy back down to 500 MeV (the injection energy) without dumping the beam. All of these changes allowed us to significantly reduce the overall time from the end of a shift to the delivery of beam in the following shift with a positive impact on the reduction of injection thermal transients for the storage ring and beamlines. Further improvements are expected in the near future as a result of planned changes to the injection timing system and of the installation of a recently assembled upgrade of the 500 MeV booster synchrotron RF system.
The energy of the injection linac and transport line into the LNLS synchrotron storage ring will be increased to 170 MeV by doubling the microwave power of the linac.The new system will operate with 4 klystrons, delivering 25 MW pulses into each one of 4 accelerating SLAC-type structures. This paper describes the design and construction and tests of 2 new klystron modulators, microwave drive system, waveguides, as well as the upgrading of the power supplies for the linac and transport line magnets.
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