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Monolithic suspension (fibers and clamping ) in Virgo+

Monolithic suspension (fibers and clamping ) in Virgo+. Flavio Travasso Thermal Noise Workshop 22-23 February 2012. MONOLITHIC SUSPENSIONS. Involved Virgo groups:. Activity tasks. Firenze/Urbino Perugia Roma EGO. General Strategy for Monolithic Suspensions Planning:

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Monolithic suspension (fibers and clamping ) in Virgo+

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  1. Monolithic suspension (fibers and clamping) in Virgo+ Flavio Travasso ThermalNoise Workshop 22-23 February 2012

  2. MONOLITHIC SUSPENSIONS Involved Virgo groups: Activity tasks • Firenze/Urbino • Perugia • Roma • EGO • General Strategy for Monolithic Suspensions Planning: • Payload parts assembled in the new 1500West Clean Room • Mirrors prepared at LMA (Lyon) • IF Possible (by cleanliness tests): payloads assembled in 1500W Clean Room

  3. THE MONOLITHIC ASSEMBLY Steel box to host the upper silica clamp on the marionetta Silicate bonding Silica Clamps on the marionette Coupling to the mirror flats through lateral supports Silica anchors

  4. FIBRES PRODUCTION • Laser pulling of 1.5 mm thick silica bars: • Welding • Annealing • Controlled pulling 100 W CO2 laser

  5. Bonding procedure • The mirror is inserted in an aluminium box with openings on the parts to be bonded… • All the FS parts are cleaned apart. • The bonding has to be made on 4 mirror sides (2 flats + markers + magnets) • Each side bonding can be performed in one day (+ 1 month for the bonding to be completed) • The box permits to fix the pieces with the solution in the right position so that after 1 day it is possible to turn the mirror. • 4 days necessary per mirror (the mirror has to be in this way for 1 month…) December 20, 2019 5

  6. Complete suspension Silicate bonding has been performed in Lyon clean room. December 20, 2019 6

  7. Advantages • Best four: pull few fibers, have a good statistics and choose the best four regarding bending point position and length • Mounting tecnique: very easy • Recovery technique: very fast • Good planarity for the suspended mirror • Strong resistance to mechanical stress

  8. Jan. ‘09 - Shocks, Dust and Humiditytests Equivalent weight of the mirror is 70 kg at the moment of breaking Crash test movie on youtube (search monolithic crash) December 20, 2019 19

  9. Disadvantages • Less monolithic: there are 2 glued parts versus the only one needed for a conservative method • Flatness of the ears: unique piece to have a good planarity for the “ancorette” • Upper clamp: silica compressed in steel (under study) but we want to change it anyhow

  10. Future plans • To measure all the possible source of noise in the Virgo+ monolithic suspension (Rome and Perugia) • Lower clamp: from the test decide for a more conservative clamps or for a Virgo+ style clamp but with a reduce bonded surface (1/12) • Upper clamp: to change anyhow the upper clamp => new design

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