A hybrid reflective/refractive/diffractive achromatic fiber-coupled radiation resistant imaging system for use in the Spallation Neutron Source (SNS)

L. C. Maxey; T. R. Ally; A. M. Brunson; F. D. Garcia; K. C. Goetz; K. E. Hasse; T. J. McManamy; M. A. Mitchell; M. L. Simpson; T. J. Shea; J. J. Kumler; D. Brown; T. Lindsey; T. Victorio

doi:10.1117/12.894125

27 September 2011 A hybrid reflective/refractive/diffractive achromatic fiber-coupled radiation resistant imaging system for use in the Spallation Neutron Source (SNS)

L. C. Maxey, T. R. Ally, A. M. Brunson, F. D. Garcia, K. C. Goetz, K. E. Hasse, T. J. McManamy, M. A. Mitchell, M. L. Simpson, T. J. Shea, J. J. Kumler, D. Brown, T. Lindsey, T. Victorio

Author Affiliations +

Proceedings Volume 8142, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII; 81420N (2011) https://doi.org/10.1117/12.894125
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

A fiber-coupled imaging system for monitoring the proton beam profile on the target of the Spallation Neutron Source was developed using reflective, refractive and diffractive optics to focus an image onto a fiber optic imaging bundle. The imaging system monitors the light output from a chromium-doped aluminum oxide (Al₂0₃:Cr) scintillator on the nose of the target. Metal optics are used to relay the image to the lenses that focus the image onto the fiber. The material choices for the lenses and fiber were limited to high-purity fused silica, due to the anticipated radiation dose of 10⁸ R. In the first generation system (which had no diffractive elements), radiation damage to the scintillator on the nose of the target significantly broadened the normally monochromatic (694 nm) spectrum. This created the need for an achromatic design in the second generation system. This was achieved through the addition of a diffractive optic for chromatic correction. An overview of the target imaging system and its performance, with particular emphasis on the design and testing of a hybrid refractive/diffractive high-purity fused silica imaging triplet, is presented.

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L. C. Maxey, T. R. Ally, A. M. Brunson, F. D. Garcia, K. C. Goetz, K. E. Hasse, T. J. McManamy, M. A. Mitchell, M. L. Simpson, T. J. Shea, J. J. Kumler, D. Brown, T. Lindsey, and T. Victorio "A hybrid reflective/refractive/diffractive achromatic fiber-coupled radiation resistant imaging system for use in the Spallation Neutron Source (SNS)", Proc. SPIE 8142, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIII, 81420N (27 September 2011); https://doi.org/10.1117/12.894125

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