A Bertolini et al 2006 Class. Quantum Grav. 23 S111 doi:10.1088/0264-9381/23/8/S15
A Bertolini1, R DeSalvo2, C Galli3, G Gennaro4, M Mantovani5, S Márka6, V Sannibale2, A Takamori7 and C Torrie2
Show affiliationsBoth present LIGO and advanced LIGO (Ad-LIGO) will need an output mode cleaner (OMC) to reach the desired sensitivity. We designed a suitable OMC seismically attenuated optical table fitting to the existing vacuum chambers (horizontal access module, HAM chambers). The most straightforward and cost-effective solution satisfying the Ad-LIGO seismic attenuation specifications was to implement a single passive seismic attenuation stage, derived from the 'seismic attenuation system' (SAS) concept. We built and tested prototypes of all critical components. On the basis of these tests and past experience, we expect that the passive attenuation performance of this new design, called HAM-SAS, will match all requirements for the LIGO OMC, and all Ad-LIGO optical tables. Its performance can be improved, if necessary, by implementation of a simple active attenuation loop at marginal additional cost. The design can be easily modified to equip the LIGO basic symmetric chamber (BSC) chambers and leaves space for extensive performance upgrades for future evolutions of Ad-LIGO. Design parameters and prototype test results are presented.
Issue 8 (21 April 2006)
Received 6 September 2005, in final form 9 November 2005
Published 24 March 2006
A Bertolini et al 2006 Class. Quantum Grav. 23 S111
J B Griffiths and J Podolský 2006 Class. Quantum Grav. 23 555
María Jesús Pareja and Malcolm A H MacCallum 2006 Class. Quantum Grav. 23 5039