Ultra-stable sub-meV monochromator for hard X-rays
| Autor: | Curt Preissner, J. Collins, Kurt Goetze, Emil Trakhtenberg, T. S. Toellner, Michael Hu, Lifen Yan |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
nuclear resonance
Cryostat Nuclear and High Energy Physics Physics::Instrumentation and Detectors Astrophysics::High Energy Astrophysical Phenomena Synchrotron radiation Infrared spectroscopy Astrophysics::Cosmology and Extragalactic Astrophysics Electromagnetic radiation monochromator law.invention symbols.namesake Optics law high energy-resolution europium Instrumentation Monochromator Physics Radiation business.industry Bremsstrahlung Research Papers symbols Physics::Accelerator Physics cryostat business Doppler effect Excitation |
| Zdroj: | Journal of Synchrotron Radiation |
| ISSN: | 1600-5775 |
| DOI: | 10.1107/s1600577515012230 |
| Popis: | A 0.27 meV-bandwidth monochromator for 21.5 keV synchrotron radiation demonstrates exceptional stability using cryogenic stabilization and active feedback control. A high-resolution silicon monochromator suitable for 21.541 keV synchrotron radiation is presented that produces a bandwidth of 0.27 meV. The operating energy corresponds to a nuclear transition in 151Eu. The first-of-its-kind, fully cryogenic design achieves an energy-alignment stability of 0.017 meV r.m.s. per day, or a 100-fold improvement over other meV-monochromators, and can tolerate higher X-ray power loads than room-temperature designs of comparable resolution. This offers the potential for significantly more accurate measurements of lattice excitation energies using nuclear resonant vibrational spectroscopy if combined with accurate energy calibration using, for example, high-speed Doppler shifting. The design of the monochromator along with its performance and impact on transmitted beam properties are presented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|