Parametric instability in the neutron star extreme matter observatory

Juntao Pan, Jue Zhang, Carl Blair, Aaron W. Jones, Chunnong Zhao, Li Ju

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Parametric instability (PI), induced by the interaction between the cavity optical modes and acoustic modes of a mirror, is an inherent risk in interferometric gravitational wave detectors. The instability can result in exponential growth in acoustic mode amplitude and the saturation of detectors control systems. In this paper we analyse PI in the neutron star extreme matter observatory, a proposed high optical power (4.5 MW) detector, operating at cryogenic temperatures with silicon test masses (TMs), targeting high sensitivity between 1 and 4 kHz. Our results show that with current design parameters, approximately 16 unstable modes will arise per TM with maximum parametric gain ∼10. Varying the TM radius of curvature from the nominal values could eliminate PI, however not with current manufacture or actuator capability. PI mitigation will be required to suppress all unstable modes. This analysis identifies four optical modes and 16 acoustic modes dominating PI in NEMO paves the way for the design of PI mitigation strategies.

Original languageEnglish
Article number085007
JournalClassical and Quantum Gravity
Issue number8
Publication statusPublished - 21 Apr 2022


Dive into the research topics of 'Parametric instability in the neutron star extreme matter observatory'. Together they form a unique fingerprint.

Cite this