| Title |
Lens Calibration for Beam Size Monitors at ThomX |
| Authors |
- S.D. Williams, G. Taylor
The University of Melbourne, Melbourne, Victoria, Australia
- I. Chaikovska, N. Delerue, A. Gonnin, V. Kubytskyi, H. Monard, A. Moutardier
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
|
| Abstract |
ThomX is a novel compact X-ray light source, utilising a laser and 50 MeV electron storage ring to produce X-ray photons via Compton scattering. Screens, observed by zoom lenses and optical cameras, can be used to monitor the transverse beam profile at various points. An issue with the implementation of this system is that after adjusting the zoom one needs to recalibrate the the optical system, measuring the resolution of the optical system and deducing the transformation from pixel space observed on the camera to geometrical space in the laboratory. To calibrate and measure the resolution limit of the cameras a USAF 1951 resolution chart that can be moved into or out of the screen position is used. We will report on and demonstrate the use of open source computer vision libraries to compute this calibration, and the affine transformation between the camera image plane and the screens can be deduced. We will also comment on how consumer available Canon EF mount lenses may be used as a remote controllable optical system.
|
| Funding |
Work supported by the French ANR under reference ANR-10-EQPX-51. Work also supported by grants from Région Ile-de-France. Work also supported by the Nicolas Baudin program. |
| Paper |
download THPP35.PDF [0.604 MB / 4 pages] |
| Poster |
download THPP35_POSTER.PDF [1.211 MB] |
| Export |
download ※ BibTeX
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※ EndNote |
| Conference |
IBIC2020 |
| Series |
International Beam Instrumentation Conference (9th) |
| Location |
Santos, Brazil |
| Date |
14-18 September 2020 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Daniel Tavares (LNLS, Campinas, Brazil); Renan Picoreti (LNLS, Campinas, Brazil); Gustavo Bruno (LNLS, Campinas, Brazil); Sergio Marques (LNLS, Campinas, Brazil); Volker R.W. Schaa (GSI, Darmstadt, Germany) |
| Online ISBN |
978-3-95450-222-6 |
| Online ISSN |
2673-5350 |
| Received |
01 September 2020 |
| Accepted |
16 September 2020 |
| Issue Date |
30 October 2020 |
| DOI |
doi:10.18429/JACoW-IBIC2020-THPP35 |
| Pages |
281-284 |
| 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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