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Development of background reduced Fresnel phase zone plate.
- Source :
-
Review of Scientific Instruments . Oct2004 Part I & II, Vol. 75 Issue 10, p4023-4025. 3p. - Publication Year :
- 2004
-
Abstract
- In study of hot and dense plasma, a high spatial resolution (a few microns) x-ray imaging is very important to observe these plasmas. The Fresnel phase zone plate (FPZP) consists of alternately material and transparent circular annuli placed concentrically, which image x rays using diffraction x rays from all annuli. FPZP have imaged 4.7–4.77 keV x rays with 2.2 μm spatial resolution. However FPZP has a problem that background level is comparable to signal level. In subtraction of background, the error of 10% is caused. For the accurate background subtraction, we designed new FPZP, which consist of three β layers of a transparent zone and two material zones. The new design FPZP parameters (thickness of material zones, each zone width) have been optimized, and in that optimum design signal-to-background ratio is 4 times better than conventional two layers FPZP. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00346748
- Volume :
- 75
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Review of Scientific Instruments
- Publication Type :
- Academic Journal
- Accession number :
- 14842137
- Full Text :
- https://doi.org/10.1063/1.1791335