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Improved long radius of curvature measurement system for FEL mirrors

Publication ,  Journal Article
Li, J; Wu, YK; Sun, C
Published in: Proceedings of the IEEE Particle Accelerator Conference
December 1, 2005

The 53.73 meter long Duke free electron laser (FEL) cavity consists of two concave mirrors with radius of curvature longer than 27 meters. A proper radius of curvature is designed to achieve an optimal and stable operation of the FEL. This requires accurate measurements of the cavity mirror's radius of curvature before its initial installation. Subsequent radius of curvature measurements are performed to ensure no significant deformation of the mirror occurs after a period of extensive use. A direct measurement based upon the geometric optics principles has been used at Duke PEL Lab (DFELL) for years. Recently, we have significantly upgraded this measurement apparatus by utilizing a He-Ne laser as the light source and a straight wire with a proper size as the object. In this paper we describe the details of the measurement setup and report the benefits of the recent upgrades. In addition, we report the improved data analysis technique and results of recent long radius of curvature measurements. © 2005 IEEE.

Duke Scholars

Published In

Proceedings of the IEEE Particle Accelerator Conference

DOI

Publication Date

December 1, 2005

Volume

2005

Start / End Page

1787 / 1789
 

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Li, J., Wu, Y. K., & Sun, C. (2005). Improved long radius of curvature measurement system for FEL mirrors. Proceedings of the IEEE Particle Accelerator Conference, 2005, 1787–1789. https://doi.org/10.1109/PAC.2005.1590913
Li, J., Y. K. Wu, and C. Sun. “Improved long radius of curvature measurement system for FEL mirrors.” Proceedings of the IEEE Particle Accelerator Conference 2005 (December 1, 2005): 1787–89. https://doi.org/10.1109/PAC.2005.1590913.
Li J, Wu YK, Sun C. Improved long radius of curvature measurement system for FEL mirrors. Proceedings of the IEEE Particle Accelerator Conference. 2005 Dec 1;2005:1787–9.
Li, J., et al. “Improved long radius of curvature measurement system for FEL mirrors.” Proceedings of the IEEE Particle Accelerator Conference, vol. 2005, Dec. 2005, pp. 1787–89. Scopus, doi:10.1109/PAC.2005.1590913.
Li J, Wu YK, Sun C. Improved long radius of curvature measurement system for FEL mirrors. Proceedings of the IEEE Particle Accelerator Conference. 2005 Dec 1;2005:1787–1789.

Published In

Proceedings of the IEEE Particle Accelerator Conference

DOI

Publication Date

December 1, 2005

Volume

2005

Start / End Page

1787 / 1789