Sputter ion pump element pumping speed measurement with the help of a Monte Carlo code
As part of the design of the vacuum system of a new Synchrotron Light Source for Brazil – SIRIUS, the Vacuum Group from the Brazilian Synchrotron Light Laboratory (LNLS) proposed the pumping speed study of a sputter ion pump element assembled inside the vacuum chamber. This configuration aims to reduce components attached to the chamber enabling an easier alignment procedure and a conductance enhancement to pumped gases. The study was carried out by experimental measurements and numerical simulations using Monte Carlo method. ::: The measurements and Monte Carlo calculations results presented a good agreement, with errors less than 10%. Further, inserting the element in the vacuum chamber enhanced maximum pumping speed when compared with the manufacturer’s data, due to the conductance’s increase for gases.
Abstract The Fibre-Injection System in the LIL–LMJ facilities makes use of a single-mode fiber based arborescent architecture. Starting from a unique single-mode oscillator, it consists of a high performance PM design which is dedicated to the generation of pulses onto a large number of synchronous outputs. The optical features to be optimised involve dynamic ranges in excess of 50 dB and the generation of 25 ns wide arbitrary waveforms at 100 ps time resolution, of which the PSD looks like a precisely controlled Bessel distribution. We analyse the complete design issues, together with the optical components which have been developed specifically. To cite this article: A. Jolly et al., C. R. Physique 7 (2006).