| Autor: |
Gluskin, E., Vinokurov, N., Tcheskidov, V., Medvedko, A., Evtushenko, Yu., Kolmogorov, V., Vobly, P., Antokhin, E., Ivanov, P., Vasserman, I. B., Trakhtenberg, E. M., Den Hartog, P. K., Deriy, B., Erdmann, M., Makarov, O., Moog, E. R. |
| Předmět: |
|
| Zdroj: |
AIP Conference Proceedings; 2000, Vol. 521 Issue 1, p344, 4p, 1 Diagram, 1 Chart, 1 Graph |
| Abstrakt: |
Linearly and circularly polarized x-rays have been very successfully applied to the study of the properties of materials. Many applications can benefit from the availability of energy-tunable, high-brilliance x-ray beams with adjustable polarization properties. A helical undulator that can generate beams of variable (linear to circular) polarization has been designed and built by the Budker Institute of Nuclear Physics and the Advanced Photon Source. The first harmonic of this 12.8-cm-period device will cover the energy range from 0.4 keV to 3.5 keV. An important feature of this fully electromagnetic device is that it will allow us to generate 100% horizontally (K[sub x]=0) or vertically (K[sub y]=0) plane-polarized radiation, which will enable many experiments otherwise not technically feasible. With symmetric deflection parameters (K[sub x]=K[sub y]), the on-axis radiation will be circularly polarized, with a user-selectable handedness. The polarization can be changed at rates up to 10 Hz. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
