Design, assembly, and testing of a telecentric zoom lens for the Cygnus x-ray source

Transcription

1 paper , 1/22 Design, assembly, and testing of a telecentric zoom lens for the Cygnus x-ray source DOE/NV/ Robert M. Malone, Stuart A. Baker, Kristina K. Brown, Alden H. Curtis, David L. Esquibel, Daniel K. Frayer, Brent C. Frogget, James R. Garten, Russell A. Howe, Joe A. Huerta, Morris I. Kaufman, Stephen S. Lutz, Kevin D. McGillivray, Andrew S. Smith National Security echnologies, LLC Michael R. Furlanetto, odd J. Haines, Nicholas S. P. King Los Alamos National Laboratory 7.4 ft, 340 lb X-rays Replaceable scintillator Pellicle 15.5 x 11 (elliptical) Moving doublets and aperture (travel: 200 to 500 mm) SI camera (travel: 23 mm) his work was done by National Security echnologies, LLC, under Contract No. DE-AC52-06NA25946 with the U.S. Department of Energy.

2 Our goal is to collect x-ray images of different sized targets, which are positioned inside a containment vessel, onto different sized CCD cameras. SPIE Optics & Photonics 2012, paper , 3/22 CCD cameras vessel scintillator

3 paper , 4/22 X-rays Cygnus telecentric zoom lens, position #1 Elliptical pellicle 5 mm thick LYSO scintillator, 200 x 200 mm square Stop (diameter and position different for each zoom position) Directions of all light sources are parallel SI-1100s camera Circles represent NA of 0.1 Moveable doublets

4 paper , 5/22 X-ray directions LYSO scintillator, 150 mm diameter 500 mm CYGNUS LINOS lens specifications 7 lens elements 160 mm EFL Collects 0.08 NA (f/6.27) Magnification 0.33 Light at CCD is 0.24 NA (f/2.08) No vignetting Aperture Stop Mirror CCD 50 mm dia. 165 mm

5 paper , 6/22 Zoom Positions #1 & #2 Square scintillator material measures mm 10 mm thick zone for calibration features 220 mm diameter object field of view to be imaged Zoom Positions #3 & #4 Square scintillator material measures mm 10 mm thick zone for calibration features 180 mm diameter object field of view to be imaged Zoom Positions #5 & #6 Zoom Positions #7 & #8 Square scintillator material measures mm 10 mm thick zone for calibration features 140 mm diameter object field of view to be imaged Square scintillator material measures mm 10 mm thick zone for calibration features 105 mm diameter object field of view to be imaged

6 paper , 7/22 X-rays CYGNUS telecentric zoom lens specifications 11 lens elements Collects 0.10 NA (f/5.0), 1.56X more light than the LINOS lens Magnification Light at CCD is NA (f/1.43) LYSO scintillator, 220 mm dia. FOV Zoom Position #1 62 mm dia. imager 11.6 " dia mm Shutter 6.0" 6.4" PBM2Y Pellicle, elliptical, 15.5" x 11.0", decentered by 16.5 mm, 20λ surface irregularity, 45º tilt S-FSL5Y S-BAL35Y PBM2Y S-FPL51 S-LAH53 BSM51Y PBM8Y mm

7 paper , 8/22

8 FS SPIE Optics & Photonics 2012, paper , 9/22

9 paper , 10/22 Element 6, S-FPL51, 208 mm by 40 mm, broke during AR coating runs, 4 times! 25% P 2 O 5 15% AlF 3 25% SrF 2 15% BaF 2 15% CaF 2 15% SrO BaO Al 2 O 3 MgF 2 no SiO 2!?! Latest recommendation is to cool 4 C / hr, from 350 C down to 80 C. SN #2.JPG, 5/12/12

10 paper , 11/22 X-rays LYSO scintillator, 105 mm dia. FOV Zoom Position #7 62 mm dia. CCD 11.6 " dia mm Shutter 6.0" 6.4" Pellicle, elliptical, 15.5" x 11.0", decentered by 16.5 mm, 20λ surface irregularity, 45º tilt Moving doublet Moving stop (diameter also changes) Moving doublet mm Moving CCD

11 paper , 12/22 X-rays LYSO scintillator, 105 mm dia. FOV Zoom Position #7 ± 4.00 mm (Z) ± 1.0 mm (XY) 62 mm dia. CCD Shutter 6.0" 6.4" ± 3.00 mm (Z) ± 0.6 (2 angles) Pellicle, elliptical, 15.5" x 11.0", decentered by 16.5 mm, 20λ surface irregularity, 45º tilt Moving doublet Moving stop (diameter also changes) Moving doublet mm CCD: ± 0.3 (2 angles)

12 Zoom Position #7 LYSO scintillator, 105 mm dia. FOV 2.00 mm minimum clearance mm minimum clearance mm minimum clearance 62 mm dia. imager Shutter 6.0" Moving CCD Zoom Position #2 LYSO scintillator, 220 mm dia. FOV mm maximum clearance mm maximum clearance mm maximum clearance 50 mm dia. imager 11.6 " dia. Shutter 6.0" Moving CCD 6.4" Pellicle, elliptical, 15.5" x 11.0", decentered by 16.5 mm, 20λ surface irregularity, 45º tilt Reference Moving doublet Moving doublet surface Moving stop SPIE Optics & Photonics (diameter 2012, also changes) paper , 13/ mm

13 RMM CYGNUS_zoom_lens_V30.len DIFFRACION MF POSIION 2 15-Jul-12 Zoom Position #2 DIFFRACION LIMI R FIELD object 0.00 O ) R FIELD object 0.00 O ) R FIELD object 0.00 O ) R FIELD object 0.00 O ) R FIELD object ) WAVELENGH WEIGH nm nm nm nm nm nm nm nm O nm 0 DEFOCUSING R 30 lp/mm 0.8 M O D U L A I O N lp/mm resolution at the 50 mm diameter CCD will resolve 1 part in 1500 across the 220 mm scintillator (147 µm) µm is goal SPAIAL FREQUENCY (CYCLES/MM) SPIE Optics & Photonics 2012, paper , 14/22

14 RMM CYGNUS_zoom_lens_V30.len DIFFRACION MF POSIION 7 15-Jul-12 Zoom Position #7 DIFFRACION LIMI R 0.00 FIELD ( object 0.00 O ) R FIELD ( object 0.00 O ) R FIELD ( object 0.00 O ) R FIELD ( object 0.00 O ) R FIELD ( object ) WAVELENGH WEIGH nm nm nm nm nm nm nm nm O nm 0 DEFOCUSING R 30 lp/mm 0.8 M O D U L A I O N lp/mm resolution at the 62 mm diameter CCD will resolve 1 part in 1860 across the 105 mm scintillator (57 µm) µm is goal SPAIAL FREQUENCY (CYCLES/MM) SPIE Optics & Photonics 2012, paper , 15/22

15 paper , 16/22 7 mm thick window protrudes 2.25 mm past metal housing 62 mm CCD camera 6.11 mm Zoom Position # mm mm sag mm minimum clearance

16 paper , 17/22 7 mm thick window protrudes 2.25 mm past metal housing 62 mm CCD camera 6.11 mm Zoom Position # mm mm sag mm maximum clearance

17 paper , 18/22 1 st lens Elliptical pellicle LYSO scintillator National PhotoColor Pellicle, elliptical, 15.5" x 11.0", decentered by 16.5 mm, 20λ surface irregularity, 45º tilt

18 Centered olerances CYGNUS_zoom_lens_V30.len 2/22/ RADIUS FRINGES HICKNESS INDEX V-NO INHOMO- SUR RADIUS OL POW/IRR HICKNESS OL GLASS OL (%) GENEIY INF / SILICA INF / INF 30.0/ REFL / SFSL5Y / / SFSL5Y / / SFSL5Y / / BAL35Y / / PBM2Y / / SFPL / / SFPL / / SLAH / / BSM51Y / / PBM8Y / / PBM2Y / INF 5.0/ SILICA INF 5.0/ Image Radius, radius tolerance, thickness and thickness tolerance are given in mm. Fringes of power and irregularity are at nm over the clear aperture. Irregularity is defined as fringes of cylinder SPIE Optics power & Photonics in test 2012, plate fit. paper , 19/22 Scintillator Pellicle Lens 1 Lens 2 Lens 3 Lens 4 Lens 5 Lens 6 Stop Lens 7 Lens 8 Lens 9 Lens 10 Lens 11 window o minimize cost of large optics, their thickness tolerance is ± 2.0 mm

19 paper , 20/ mm sq. Using the same scaling for the current LINOS lens and for the new zoom lens 200 mm sq. Zoom Position # mm

20 paper , 21/22 Lenses shift positions for CsI scintillator operation New lens for CsI scintillator operation Moving doublet Moving stop (diameter also changes) Moving doublet mm Moving CCD

21 paper , 22/22 Summary We have enough optical elements to finish the first system. (We are building 3 systems.) his is a telecentric zoom lens. Each optical element or lens group protected inside a lens cell. We are using counter propagating laser beams to align each optical element and verify tracking. First system to be tested at Sandia on the RIS x-ray machine in the horizontal position. hen, testing in the vertical position. Order the replacement lens for green scintillator operation on the 3 rd system. 7.4 ft, 340 lb laser laser X-rays Replaceable scintillator Pellicle 15.5 x 11 (elliptical) Moving doublets and aperture (travel: 200 to 500 mm) SI camera (travel: 23 mm)