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Uniform large-area x-ray imaging at 9 keV using a backlit pinhole
Jonathan Workman1, James R Fincke, George A Kyrala
1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. workman@lanl.gov
Applied Optics
|March 9, 2005
Summary
We developed a point backlighting technique for diagnosing high-energy X-ray experiments. This method uses a zinc source and pinhole aperture, offering uniform irradiance and circumventing high laser energy needs for better resolution.
Area of Science:
- High-energy X-ray physics
- Plasma diagnostics
- Radiation-driven experiments
Background:
- Diagnosing radiation-driven experiments requires effective backlighting techniques.
- Existing area backlighters demand substantial laser energy at high X-ray energies (≥9 keV).
- Point backlighting offers a potential solution for uniform irradiance over large fields.
Purpose of the Study:
- To develop and apply a point backlighting technique for high X-ray energy applications.
- To demonstrate a zinc (Zn) 9 keV point-backlighter source.
- To assess the technique's effectiveness in diagnosing radiation-driven experiments.
Main Methods:
- Utilizing pinhole aperturing to precisely define the X-ray source size and control resolution.
- Developing a zinc (Zn) 9 keV point-backlighter source.
- Applying the technique to an undriven gold-walled hohlraum for diagnostic evaluation.
Main Results:
- Successful implementation of a Zn 9 keV point-backlighter source.
- Demonstration of uniform backlighter irradiance over a large field of view.
- Circumvention of high laser energy requirements associated with area backlighters at 9 keV and above.
Conclusions:
- The developed point backlighting technique is essential for diagnosing high-energy X-ray experiments.
- Pinhole aperturing effectively defines source size and resolution for point backlighters.
- This technique offers a more efficient alternative to area backlighters for high-energy X-ray diagnostics.