Abstract
We present a new accelerator toolbox (AT)-based toolkit for simulating the commissioning of light-source storage rings. The toolkit provides a framework for supporting high-level scripts to represent with realism the various procedures (e.g., orbit and optics correction, beam-based alignment, etc.) encountered during commissioning and is designed to mirror as closely as possible the reality as seen from the control room. Emphasis is placed on the inclusion of a comprehensive set of error sources and faithful modeling of beam diagnostics. The toolkit capabilities are demonstrated in an application to the recent design and commissioning studies of the Advanced Light Source Upgrade (ALS-U) Accumulator Ring, a short-time successful commissioning of which will be critical to the overall ALS-U project success.
Highlights
To achieve small beam emittance, diffraction-limited light sources employ lattice designs based on high-gradient and small-aperture focussing elements, which lead to larger natural chromaticities, stronger chromatic sextupoles, and highly nonlinear lattices [1,2]
The apparent improvement of the vertical closed orbit deviation with increasing error scaling factor is due to the fact that only for lattice realizations with sufficiently small vertical orbit deviation the closed orbit is within the physical aperture and therefor exists
The average number of required beam injections is 192 with a standard deviation of about 9 injections. This small relative spread within the error realizations indicates that the required number of injections for the correction chain is dominated by the fixed number of steps in scans like, e.g., the rf commissioning, which is equal for all error realizations
Summary
To achieve small beam emittance, diffraction-limited light sources employ lattice designs based on high-gradient and small-aperture focussing elements, which lead to larger natural chromaticities, stronger chromatic sextupoles, and highly nonlinear lattices [1,2]. A consequence of the combined strong nonlinearities and focusing is an enhanced sensitivity to magnet and other lattice errors This places emphasis on the need for realistic modeling of the relevant errors, the development of efficient beam orbit/optics correction schemes, and high fidelity simulations of the actual procedures used for correction, with the goal to establish feasible error tolerance specifications and ensure rapid commissioning. The new tool, the Toolkit for Simulated Commissioning (SC), is an extension to the MATLAB®-based [11] Accelerator Toolbox (AT) [12] It has been designed with the primary goal of conducting realistic commissioning simulations of electron storage-rings including a large variety of error sources as well as accurately treating the beam diagnostics, within a framework that tries to reproduce as closely as possible the point of view of the machine operator. IV we apply the SC toolkit to the ALS-U AR while performing a start-to-finish commissioning simulation study including the transfer line from the booster
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