| Autor: |
Shvyd'ko, Yuri, Stoupin, Stanislav, Mundboth, Kiran, Kim, Jungho |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Physical Review A 87, 043835 (2013) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevA.87.043835 |
| Popis: |
Spectrographs take snapshots of photon spectra with array detectors by dispersing photons of different energies into distinct directions and spacial locations. Spectrographs require optics with a large angular dispersion rate as the key component. In visible light optics diffraction gratings are used for this purpose. In the hard x-ray regime, achieving large dispersion rates is a challenge. Here we show that multi-crystal, multi-Bragg-reflection arrangements feature cumulative angular dispersion rates almost two orders of magnitude larger than those attainable with a single Bragg reflection. As a result, the multi-crystal arrangements become potential dispersing elements of hard x-ray spectrographs. The hard x-ray spectrograph principles are demonstrated by imaging a spectrum of photons with a record high resolution of $\Delta E \simeq 90 \mu$eV in hard x-ray regime, using multi-crystal optics as dispersing element. The spectrographs can boost research using inelastic ultra-high-resolution x-ray spectroscopies with synchrotrons and seeded XFELs. |
| Databáze: |
arXiv |
| Externí odkaz: |
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