LNLS, Campinas
We present an overview of a new synchrotron radiation source currently being designed at the Brazilian Synchrotron Light Laboratory (LNLS) in Campinas. The LNLS-1 light source, based on a 1.37 GeV storage ring, has been in routine operation since 1997. The LNLS-2 light source will consist of an injector system and a low emittance 2.5 GeV electron storage ring capable of delivering undulator radiation with average brightness in excess of 1020 photons/sec/0.1%/mm2/mrad2 in the few hundred eV to several tens of keV photon energy range. High flux radiation up to 100 keV will also be available with the use of superconduting wigglers. In this work, we present the basic design considerations and parameters for a proposed magnetic lattice for LNLS-2, with special attention to providing solutions for the realization of low emittance which are cost effective regarding both the construction investment as well as the operation of the facility. In particular, the possibility of the large scale use of permanent magnet technology for the storage ring lattice magnets is discussed.
LNLS, Campinas
We describe the development of a new button-type beam position monitor (BPM) for the Brazilian Synchrotron Light Source (LNLS) electron storage ring. One third of the storage ring stripline BPMs were replaced whit this new model, which counts on bellows, temperature stabilization and new support stands in order achieve improved mechanical stability. Finally, in-vacuum heat absorbers were installed at the upstream vacuum tubes of the bending magnets to minimize the vacuum chamber motion due to the high thermal load. We also present performance results.
LNLS, Campinas
UNICAMP, Campinas, São Paulo
This paper reports on the LNLS experience with the digital electron beam position monitor Libera Brilliance through the realization of several standard accelerator physics experiments, taking advantage mainly of the equipment’s turn-by-turn capabilities.
LNLS, Campinas
As part of our efforts to improve beam stability in LNLS light source, we developed a system for automating tune measurements in the storage ring. This system is based on a commercial spectrum analyzer controlled via a GPIB port fed by a difference signal from a stripline pickup. Following a tandem-like approach, the software is divided in two parts: one inside the main operation software in the control system, which sends commands, and another one designed for receiving these commands and to suitably manage the analyzer The system is capable of setting the analyzer for optimal measurements for almost all operating conditions of the machine. This is achieved through feedback algorithms and triggered events. This tool improves machine diagnostics during failure conditions such as undesired magnet changes and is fast enough to enable tune tracking during particular events, such as ID movements and energy ramps.
LNLS, Campinas
The main facility of the Brazilian Synchrotron Light Laboratory is a 1.37 GeV Synchrotron Light Source. The accelerator ring can be filled with up to 148 electron bunches and the initial current of 250 mA decreases down to 150 mA at the end of the user’s shifts. The beam energy is ramped down to 500 MeV, the current is refilled and the energy is ramped up again to 1.37 GeV for a new shift. Coupled-bunch instabilities excited by different sources can negatively impact the light source performance either lowering the brilliance of the beam or causing beam losses in the energy ramps. The upcoming new insertion devices and beamlines are pushing up the beam stability requirements even more. We present the current status of a digital feedback system that is being designed for controlling transversal and longitudinal beam instabilities.