Silicon carbide X-ray beam position monitors for synchrotron applications

Area of Science:

• Materials Science
• Particle Accelerators
• X-ray Optics

Background:

• Radiation-hard materials are crucial for accurate beam monitoring in high-energy physics and synchrotron radiation facilities.
• Current X-ray beam position monitors (XBPMs) often utilize single-crystal or polycrystalline diamond, which can be expensive and have limitations.

Purpose of the Study:

• To investigate the performance of thin silicon carbide (SiC) membranes as a material for radiation-hard XBPMs.
• To compare the thermal and electrical behavior of SiC-based XBPMs with those made from single-crystal diamond.
• To evaluate the practical performance of fabricated SiC XBPMs against commercial diamond devices.

Main Methods:

• Finite-element simulations were employed to compare the thermal and electrical properties of SiC and diamond XBPMs.
• Fabricated SiC XBPMs were experimentally tested and compared with a commercial polycrystalline diamond XBPM at the Swiss Light Source.
• Key performance metrics including transparency, linearity, dynamics, and signal-to-noise ratio were assessed.

Main Results:

• Silicon carbide membranes demonstrated comparable transparency to diamond in XBPM applications.
• SiC-based XBPMs exhibited superior linearity, dynamics, and signal-to-noise ratio compared to commercial polycrystalline diamond devices.
• Simulations indicated comparable thermal and electrical behavior between SiC and diamond materials.

Conclusions:

• Thin silicon carbide membranes are a viable and potentially superior alternative to diamond for most X-ray beam position monitoring applications.
• The availability of large-scale, electronic-grade SiC wafers makes it an economically attractive option.
• Diamond may still be preferred for extremely high X-ray power densities due to its lower absorption characteristics.