291 research outputs found
Automatic tuning of Free Electron Lasers
Existing FEL facilities often suffer from stability issues: so electron
orbit, transverse electron optics, electron bunch compression and other
parameters have to be readjusted often to account for drifts in performance of
various components. The tuning procedures typically employed in operation are
often manual and lengthy. We have been developing a combination of model-free
and model-based automatic tuning methods to meet the needs of present and
upcoming XFEL facilities. Our approach has been implemented at FLASH
\cite{flash} to achieve automatic SASE tuning using empirical control of orbit,
electron optics and bunch compression. In this paper we describe our approach
to empirical tuning, the software which implements it, and the results of using
it at FLASH. We also discuss the potential of using machine learning and
model-based techniques in tuning methods
Fitting Algorithms for Optical and Beam Parameters in Transfer Lines with Application to the LHC Injection Line T12
As part of the commissioning with beam of the transfer line TI2 and TI8 from the SPS to the LHC [1], a series of optics measurements has been conducted. The paper presents the results in terms of Twiss parameters (including the dispersion), emittance and momentum spread obtained from the combination of trajectory and beam profile measurements. Profiting from the redundancy of monitors, there is a possibility of applying different fitting algorithms to retrieve beam parameters and to extract information on the optics of the line. The results from the different fit methods applied to the data will be compared with the expected values and cross-checked with independent measurements
The BDSIM Toolkit
This report is a description of the BDSIM toolkit based on the User's Manual for the v0.1 version
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