Virgo Coatings Development: The Post-O5 Timeline
In-depth exploration of the Virgo coatings development in the Post-O5 timeline, focusing on various aspects such as legacy, proposals, and preliminary ideas for the PO5P team. The content showcases insights into materials, deposition techniques, and technological advancements in the field.
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Presentation Transcript
Virgo Coatings Development in the Post-O5 timeline Gianpietro Cagnoli for the PO5P team
The Post O5 Proposal team The team M. Bazzan G. Cagnoli E. Cesarini C. Di Giorgio M. Granata M. Magnozzi F. Piergiovanni F. Puosi J. Steinlechner Contact person for the Post-05 Committee Established during the first week of March Team objective Prepare a Post-O5 proposal and present it to the VCR&D Methodology Periodic meetings Contact the experts in each field G. Cagnoli GWADW 2021 2
Legacy of the A+ coating development Origin of mechanical losses TLS with the dynamics driven by Asymmetric Double Well Potential ? ? Room temperature Stiff Floppy structure structure ? 1 eV 500 meV ? 100 meV Most of oxides High coordination number amorphs ? = ?0( ) ? ? ??? G. Cagnoli GWADW 2021 3
Legacy of the A+ coating development Origin of absorption A clear picture has not yet developed Right stoichiometry is fundamental Amorphous structure produces localized states in the band gap G. Cagnoli GWADW 2021 4
A+ coatings proposal Floppy structure GeO2/TiO2 SiO2/TiO2 Stiff structure SiNx The limited number of options was dictated by the timeline of O5 The products of the coating R&D are still to be seen Post-O5 developments will exploits the coating R&D G. Cagnoli GWADW 2021 5
Preliminaries ideas for PO5P Continuity with CRD Prepare scenarios based on readiness of technology Propose a reflection on the most technological aspects of coating deposition Uniformity Point defects Corrective coatings LIGO Complementarity is the key factor So far OWG has not expressed any point of view on this idea G. Cagnoli GWADW 2021 6
What are the CRD ideas we keep in the PO5P Amorphous materials Types Deposition techniques Post deposition treatments Metrology There are still important open issues in loss measurements Absorption It is becoming THE parameter to keep under control A reliable theory has to be developed G. Cagnoli GWADW 2021 7
What are the novelties in PO5P - 1 Technological aspects of coating deposition Thickness uniformity on up to 60cm diameter mirrors Other techniques than masks possibles? Corrective coatings: Uniformity correction Reflectivity correction Point defects: Reduction of density by deposition optimization Defect removal by Ion Beam ablation Very likely these topics will be investigated by LMA only, without collaboration with other groups G. Cagnoli GWADW 2021 8
What are the novelties in PO5P - 2 Large band-gap materials The experience of CMS with AlGaAs has shown that the material is extremely good for coatings The amorphous state: Larger absorption wrt the crystalline state Stiff structure materials: good for thermal noise Not limited by the lattice mismatch: high index contrast less layers Not limited by mirror size G. Cagnoli GWADW 2021 9
What are the novelties in PO5P - 3 Crystalline coatings Thanks to the expertize of the U. Leuven, VCR&D can now start a development of this technology Coating transfer and bonding will be investigated as well as materials Complementarity wrt LIGO will be applied G. Cagnoli GWADW 2021 10
What are the novelties in PO5P - 4 Larger collaboration G. Cagnoli GWADW 2021 11
What are the novelties in PO5P - 5 Different scenarios Minimal coatings upgrade Amorphous A+ materials optimization Large upgrades Technological aspects Challenging amorphous materials Crystalline coatings ET Post O5 is considered also as Pre-ET: Performances are evaluated at room temperature as well as at cryogenic ones G. Cagnoli GWADW 2021 12
The most challenging and ambitious objective of all Funding G. Cagnoli GWADW 2021 13
