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Bakhita Thordarson, Columbia UniversityMentor: Peter Cheimets, SAO
Improved Ray Trace Program for Deformed X-ray Optical Systems
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Accomplishments
Increased processing speed by a factor of 5
Adapted the program to use input from new FEA software
Program now accepts new optical designs and predicts optical performance for both the perfect surface and an approximation of the deformed surface
Program also has the ability to reflect rays off of the actual deformed surface
Ray accuracy
Ray trace results
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Overview
We need the ability to evaluate the optical performance of deformed optical systems
Current programs to do so either do not work because of system upgrades or are inefficient and not very versatile
They ray trace off of the ideal surface rather than the deformed surface
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Wolter I System
X-ray optical system
Two mirror system, parabola followed by a hyperbola
Examples Chandra Solar B
Incoming ray
Wolter I System
X-rays
Solar B
Chandra
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Optical Surface Analysis Code (OSAC)
OSAC Previous program for ray tracing deformed
optics Written in Fortran Obsolete due to several system upgrades
OSAC-like Program Written in Matlab Slow Not very versatile No longer have the ability to retrieve the FEA
data
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Improved program
Now accepts data from new FEA input files
Increased processing speed by 5x
User input allows for more versatility and variability in results
Helped develop GUI
Now able to deflect the rays off of the deformed surface
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Modeled Deformed Surface
Parabolic Mirror
Hyperbolic Mirror
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GUI
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Finding the Deformed Surface
θr
z
Delta r
ray
Ideal surface
Deformed surface
Reflected ray
Reflected ray
α
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ResultsIdeal Surface
Approximated Deformed Surface
Deformed Surface
RMS dia: 0.396 arcsec
RMS dia: 1.037 arcsec
RMS dia: 0.011 arcsec
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Future Work
Now that it’s working for two surfaces, make sure the rays are finding the deformed second surface
Work with slopes generated from FEA program rather than calculated slopes
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Acknowledgements
Peter Cheimets
Jenna Samra
Mark Freeman
Kathy Reeves and Henry Winter
MaGIXS Technology Development Contract NNM13AA40C
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Finding the Deformed Surface
Work with the deformed surface rather than ideal one
Use the angle with the surface and the delta r to walk along the ray path
Iterative process; if deformed surface is not found, repeat the process with the same angle and the new delta r