Advanced Virgo and Einstein Telescope Bas Swinkels (Nikhef) 7 th - - PowerPoint PPT Presentation

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Advanced Virgo and Einstein Telescope Bas Swinkels (Nikhef) 7 th - - PowerPoint PPT Presentation

Nov 06, 2023 559 likes •719 views

Advanced Virgo and Einstein Telescope Bas Swinkels (Nikhef) 7 th Belgium-Dutch GW meeting Groningen 29/05/2018 Advanced Virgo B. Swinkels AdVirgo & ET - Groningen 1 Advanced Virgo A lot has happened since the last meeting ...

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  • B. Swinkels – AdVirgo & ET - Groningen

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Advanced Virgo and Einstein Telescope

7th Belgium-Dutch GW meeting Groningen 29/05/2018 Bas Swinkels (Nikhef)

Advanced Virgo

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Advanced Virgo

  • A lot has happened since the last meeting ...
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AdV commissioning before O2

  • Delayed due to various technical issues, main one was the repeated breaking of the monolithic fibers
  • Decided to temporarily suspend mirrors with steel wires
  • Commissioning was rushed to be able to join LIGO for the O2 science run
  • Final big issue (aliasing of high frequency mirror modes) was solved only 3 weeks before the run
  • Managed to join for just last month ...
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Advanced Virgo in O2

  • Participated for 24 days with 85% duty cycle, ~27 Mpc BNS range
  • GW170814: first triple detection of a BBH
  • GW170817: first detection of a BNS, low SNR in Virgo since it was

in our blind spot, actually helped for the sky localization

  • GW signal in coincidence with a GRB: start of multi-messenger

astronomy, most observed event ever

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Post-O2: Monolithic supsension

  • Problem identified and corrected : improved venting of vacuum system, fiber guards
  • Mirrors re-installed with fused-silica fibers, should give theoretical increase from 30 to 50 Mpc
  • Quality factor of violin modes lower than expected, suspect slightly increased thermal noise due to ear

damage

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Other post-O2 upgrades

  • Installed frequency independent squeezer built by AEI Hanover, beam into interferometer being aligned
  • Replaced high-power laser amplifier (100W), up to 60 W available after Input Mode Cleaner
  • New pre-mode-cleaner
  • Installed seismometer arrays for testing Newtonian noise cancellation
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Post-O2 commissioning

  • Increase of input power from 14 to 26.5 W, first use of Thermal Correction System
  • Recovering of lock after suspension upgrade took bit longer than foreseen. Only recently back in low

noise operation, best sensitivity so far 25 Mpc

  • Unblocked External Injection Bench
  • Goal: start O3 early next year with sensitivity of at least 60 Mpc
  • Considerable contribution to commissioning effort by Nikhef members, see e.g. phase camera talk by

Laura

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AdV+ upgrade 1

  • Mid-life upgrade of Advanced Virgo, transition form Advanced Virgo to Third Generation observatories,

factor 2 improvement in sensitivity

  • Phase 0 (120 Mpc): complete Advanced Virgo:

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monolithic suspensions: done, but improvement to be confirmed

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high power laser: watch out for parametric instabilities, thermal effects

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signal recycling: needs auxiliary green laser, or alternative lock acquisition strategy

  • Phase 1 (160 Mpc):

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frequency dependent squeezing: needs a ~300 m filter cavity

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Newtonian news cancellation (see Boris’ talk for the sensors)

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AdV+ upgrade 2

  • Phase 2 (300 Mpc): larger beams on larger, heavier mirrors
  • Needs extensive R&D on coatings, upgrade of coating equipment, adaption of suspensions
  • Exact details (optical design, mirror sizes) still TBD
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Einstein Telescope

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ET potential sites

  • Birth of the ET collaboration, sign up for the letter of intent! http://www.et-gw.eu/index.php/letter-of-intent
  • 3 candidate sites so far:

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BE/DE/NL: Liege/Aachen/Maastricht area strong political support, interesting geology (see Soumen’s talk), lots of universities/high- tech companies nearby

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Italy: mountains in north of Sardinia very uniform geology, dry, remote area

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Hungary: Matrá mountains, only limited seismic studies

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ET prototype and other studies

  • Will need to test key technology at prototype level before ET construction
  • Recently submitted a pre-proposal for an InterReg project between provinces from Vlaanderen and south
  • f NL, money is for facility only, need matched funding from others (NL groups, BE groups, province ...)
  • ~10 m Fabry-Perot Michelson with cryogenic test masses
  • Proposal so far is ‘for politicians only’, technical details to be decided soon
  • More funding opportunities in the next years, also with Germany
  • Urgent need for study of geologic/seismic feasibility of ET in the NL/BE/GE area

AEI 10 m CLIO 100 m (cryogenic)

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Conclusions

  • Joined O2 science run just in time, and what a time it was ...
  • Post O2: short shutdown to finally install monolithic payloads, squeezer, high

power laser

  • Ambitious goal to reach 60 Mpc for O3 by the end of the year
  • AdV+ upgrades: bridge between AdV and ET
  • Time to prepare a serious bid to host ET in the NL/BE/DE area in the next years,

need to act now

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End