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Figure 23
System summary for Aramis beamline operation. The K-value is obtained from the user-defined value of radiation wavelength in the Control Room and is then passed on to the SUBLIME models, where values for the parameters that control the undulators are produced (undulator and phase shifter gaps and orbit corrector currents) and passed on to EPICS. The SUBLIME models are all derived from the magnetic measurements of all U15 undulators and their respective correctors. These parameters are then implemented on the undulator line through EPICS. Amendments may still need to be implemented on SUBLIME once commissioning of the Aramis beamline is underway and online measurements are available. The value of the undulator gap is continuously acquired from each U15 undulator while setting the undulator gap for operation, and is used to calculate the current that needs to be applied to all orbit correctors in order to prevent loss of electron orbit while setting the undulator gap. Feedback models are used for this purpose.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 3| May 2018| Pages 686-705
https://doi.org/10.1107/S1600577518002205
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