On the thermal stability of multilayer optics for use with high X-ray intensities

Zakharova, Margarita (avtor), Rek, Zlatko (avtor), Šarler, Božidar (avtor), Bajt, Saša (avtor)

High-intensity X-ray free electron laser (XFEL) beams require optics made of materials with minimal radiation absorption, high diffraction efficiency, and high radiation hardness. Multilayer Laue lenses (MLLs) are diffraction-based X-ray optics that can focus XFEL beams, as already demonstrated with tungsten carbide/silicon carbide (WC/SiC)-based MLLs. However, high atomic number materials such as tungsten strongly absorb X-rays, resulting in high heat loads. Numerical simulations predict much lower heat loads in MLLs consisting of low atomic number Z materials, although such MLLs have narrower rocking curve widths. In this paper, we first screen various multilayer candidates and then focus on Mo2C/SiC multilayer due to its high diffraction efficiency. According to numerical simulations, the maximum temperature in this multilayer should remain below 300°C if the MLL made out of this multilayer is exposed to an XFEL beam of 17.5 keV photon energy, 1 mJ energy per pulse and 10 kHz pulse repetition rate. To understand the thermal stability of the Mo2C/SiC multilayer, we performed a study on the multilayers of three different periods (1.5, 5, and 12 nm) and different Mo2C to SiC ratios. We monitored their periods, crystallinity, and stress as a function of annealing temperature for two different heating rates. The results presented in this paper indicate that Mo2C/SiC-based MLLs are viable for focusing XFEL beams without being damaged under these conditions.

• Jezik: Angleški jezik
• Ključne besede: x-ray optics, multilayer Laue lens, thermal stability, numerical simulation
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2024
• Št. strani: Str. 1933-1948
• Številčenje: Vol. 14, iss. 8
• PID: 20.500.12556/RUL-159255
• UDK: 535:519.62
• ISSN pri članku: 2159-3930
• DOI: 10.1364/OME.527226
• COBISS.SI-ID: 200647939
• Datum objave v RUL: 04.07.2024

Gradivo je del revije

• Naslov: Optical materials express
• Skrajšan naslov: Opt. mater. express
• Založnik: Optical Society of America
• ISSN: 2159-3930
• COBISS.SI-ID: 17733142

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: rentgenska optika, večplastna leča Laue, termična stabilnost, numerične simulacije