| Title |
Continuous Scans with Position Based Hardware Triggers |
| Authors |
- H. Enquist, A. Bartalesi, B. Bertrand, J. Forsberg, Á. Freitas, V. Hardion, M. Lindberg, C. Takahashi
MAX IV Laboratory, Lund University, Lund, Sweden
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| Abstract |
At beamline end-stations, data taking that relies on traditional step scanning, in which motors are repeatedly started and stopped, leads to inefficient usage of the x-ray source. This also increases the risk of sample radiation damage. We have developed a system where scans are performed while continuously moving the motors. To ensure stable repeatable measurements, the detector triggers are generated, in hardware, from the motor encoder positions. Before the scan starts, a list of positions is generated and as the scan progresses a trigger is produced as each successive position in the list is reached. The encoder signals from the motors are connected both to the IcePAP motion controller for closed loop operation, and a PandABox which is used as the trigger source. Control is from Tango and Sardana with a TriggerGate controller that calculates the motor positions and configures the PandABox. The scanned motor can be either a single motor, for example a sample positioner, or a combined motion like a monochromator. When combined motions are required, these make use of the parametric trajectory mode of the IcePAP. This enables continuous scans of coupled axes with non-linear paths.
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| Paper |
download FRBR04.PDF [0.439 MB / 5 pages] |
| Slides |
download FRBR04_TALK.PDF [1.685 MB] |
| Cite |
download ※ BibTeX
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※ EndNote |
| Conference |
ICALEPCS2021 |
| Series |
International Conference on Accelerator and Large Experimental Physics Control Systems (18th) |
| Location |
Shanghai, China |
| Date |
14-22 October 2021 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Kazuro Furukawa (KEK, Tsukuba, Japan); Yingbing Yan (SARI,Shanghai, China); Yongbin Leng (SARI,Shanghai, China); Zhichu Chen (SARI,Shanghai, China); Volker RW Schaa (GSI, Darmstadt, Germany) |
| Online ISBN |
978-3-95450-221-9 |
| Online ISSN |
2226-0358 |
| Received |
10 October 2021 |
| Revised |
14 October 2021 |
| Accepted |
12 November 2021 |
| Issue Date |
20 November 2021 |
| DOI |
doi:10.18429/JACoW-ICALEPCS2021-FRBR04 |
| Pages |
1069-1073 |
| Copyright |
 Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |
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