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Title: Assembly and testing of a large zoom lens for proton radiography

Conference · · Proceedings Volume 10747, Optical System Alignment, Tolerancing, and Verification
DOI:https://doi.org/10.1117/12.2324289· OSTI ID:1499704
 [1];  [1];  [1];  [1];  [1]
  1. Nevada National Security Site, Mission Support and Test Services LLC
+ Show Author Affiliations

A zoom lens has been designed for proton radiography applications. Radiographic images are recorded at the end of an accelerator, where protons exit an aluminum vacuum window, producing a shadowgraph image onto an LYSO (lutetium yttrium orthosilicate) scintillator. Emission from this 5-inch-square scintillator reflects off a pellicle and is then collected by a zoom lens located 24 inches away. Proton radiography can make high-speed, multi-frame radiographs or radiographic movies. This zoom lens provides 2X magnification for viewing different object sizes. The zoom lens incorporates eleven lenses, including a moving doublet that changes the magnification. Refocus of the camera is required when zooming. Only one moving doublet lens is required to change magnification. The stop was anchored to the moving doublet, and its diameter is unchanged throughout magnification changes. The entire lens system is housed in a cylindrical tube. This lens will be used with a 10-frame camera with a 44 × 44 mm square image format and 1100 × 1100 pixel resolution. Suppressing stray light is very important in this lens system. Radial compensation is controlled by two locking micrometers on element 9, which relaxes the mechanical tolerancing. A helical cam barrel using a linear rail controls the movement of the doublet. Alignment of the mechanical gears will be discussed.

Research Organization:
Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
DOE Contract Number:
DE-NA0003624
OSTI ID:
1499704
Report Number(s):
DOE/NV/03624-0228
Journal Information:
Proceedings Volume 10747, Optical System Alignment, Tolerancing, and Verification, Vol. 10747, Issue XII; Conference: SPIE Optical Engineering + Applications, August 19 - 23, 2018, San Diego, California
Country of Publication:
United States
Language:
English

References (3)

Paraxial analysis of double-sided telecentric zoom lenses with four components journal November 2014
An 800-MeV proton radiography facility for dynamic experiments
  • King, N. S. P.; Ables, E.; Adams, Ken
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 424, Issue 1 https://doi.org/10.1016/S0168-9002(98)01241-8
journal November 1999
WITHDRAWN: Ultra-high speed burst-mode imager for multi-frame radiography
  • Kwiatkowski, Kris; Nedrow, Paul; Douence, Vincent
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment https://doi.org/10.1016/j.nima.2010.11.051
journal November 2010

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Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
zoom lens
proton radiography
optical alignment
optical tolerance