Note: silicon carbide telescope dimensional stability for space-based gravitational wave detectors

Area of Science:

• Astrophysics and Space Science
• Gravitational Wave Astronomy
• Materials Science

Background:

• Space-based gravitational wave detectors require highly stable instruments to measure minute distance changes between proof masses.
• Telescopes are critical components, demanding dimensional stability below 1 picometer per square root of Hertz at 3 millihertz.
• Lightweight, strong, and stiff telescope structures are essential for space missions.

Purpose of the Study:

• To design, construct, and test a silicon carbide quadpod telescope structure for space-based gravitational wave detectors.
• To evaluate the dimensional stability of the silicon carbide quadpod at various temperatures.
• To assess the suitability of the proposed structure for meeting stringent stability requirements.

Main Methods:

• A silicon carbide quadpod telescope structure was designed and fabricated.
• Dimensional stability measurements were performed at room temperature and at -60 °C.
• Experimental results were compared against the required performance criteria for gravitational wave detection.

Main Results:

• The silicon carbide quadpod structure demonstrated dimensional stability meeting the requirements at room temperature.
• At -60 °C, the structure's dimensional stability did not meet the stringent requirements.
• Temperature fluctuations within the testing setup were identified as a contributing factor to the performance at cryogenic temperatures.

Conclusions:

• Silicon carbide is a viable material for constructing stable telescope structures for space-based gravitational wave observatories.
• The designed quadpod structure shows potential but requires further refinement to achieve stability at cryogenic temperatures.
• Addressing temperature fluctuations is crucial for future development and deployment in low-frequency gravitational wave detection missions.