Conveners
Scatter light for LF: Scattered light for LF
- Siddharth Soni ()
- Alena Ananyeva (Caltech)
Bidirectional Reflectance Distribution Function (BRDF) of LIGO and Virgo test masses quantifies the reflection of mirrors. It is related to the round trip loss (RTL) of the arm cavity and to various stray lights which induce noises in various ways. The available data of BRDF is limited and the RTL cannot be fully calculated by using existing BRDF data. This talk summarizes existing BRDF data...
During the third Observing run, Fast Scattering was the most
frequent source of transient noise at LIGO Livingston. The noise shows up
as arches in time-frequency plane, usually separated by 0.25 sec (4 Hz) or
0.5 sec (2 Hz) from each other. This noise has been found to be correlated
with elevated levels of ground motion in the anthropogenic and microseismic
band. Depending on the amount...
Scattered light is a source of noise which limits the performance of current gravitational wave detectors.
In order to understand and mitigate this effect it is important to know quantitatively the amount of light backscattered by all the elements located on optical benches. To this purpose we built at LAPP an interferometric scattermeter with which the BRDF of the desired elements is...
In April 2021, a new instrumented baffle was installed surrounding the suspended end mirror of the Virgo’s Input Mode Cleaner (IMC) cavity, as part of the phase I upgrade of the Advanced Virgo interferometer. The device is equipped with photo sensors that monitor the stray light inside the cavity. It serves as a demonstrator of the technology for the baffles that will monitor the stray light...
