Abstract
A hybrid seven-bend-achromat lattice that features very strong focusing elements and a relatively small vacuum chamber has been proposed for the Advanced Photon Source (APS) upgrade. The design lattice parameters during commissioning will need to be quickly achieved in order to minimize the interruption of user operation. This paper describes start-to-end simulation of the machine commissioning beginning from first-turn trajectory correction, progressing to orbit correction, and culminating in lattice correction and coupling adjustment. The automated commissioning procedure shows that the rapid commissioning of the ultralow emittance lattice is possible. It also enables a more rigorous statistical evaluation of expected performance of proposed lattices.
Highlights
The Advanced Photon Source [1] is a 7-GeV, 100-mA, 40-sector 3rd generation storage ring light source with a 1104-m circumference, providing beams to dozens of insertion device (ID) and bending magnet (BM) beamlines simultaneously
Due to compactness of the lattice, the correctors in the new machine will be five to ten times weaker than in the present Advanced Photon Source (APS) while the quadrupole kicks due to misalignments will be five times stronger. These many factors suggest that the hoped-for three-month commissioning period will be very challenging. This paper addresses this question using a realistic simulation of the commissioning process
The upstream and downstream ends of the girder are randomly misaligned with the displacement given in Table II; the magnets on the girder are assigned displacements following the straight line connecting the ends of the girder
Summary
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA (Received 18 September 2018; published 26 April 2019). A hybrid seven-bend-achromat lattice that features very strong focusing elements and a relatively small vacuum chamber has been proposed for the Advanced Photon Source (APS) upgrade. The design lattice parameters during commissioning will need to be quickly achieved in order to minimize the interruption of user operation. This paper describes start-to-end simulation of the machine commissioning beginning from first-turn trajectory correction, progressing to orbit correction, and culminating in lattice correction and coupling adjustment. The automated commissioning procedure shows that the rapid commissioning of the ultralow emittance lattice is possible. It enables a more rigorous statistical evaluation of expected performance of proposed lattices
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