Seismic Platform Interferometer for improved low frequency performance of aLIGO

Document #:

LIGO-G2201531-v2

Document type:

G - Presentations (eg Graphics)

Abstract:

The LIGO group at Stanford has built and is working to evaluate the precision and stability a prototype for a Seismic Platform Interferometer, with help from and based on the designs provided by Sina Köhlenbeck. It is a phasemeter, and the current model uses a Mach-Zehnder topology with kHz-order heterodyne beat note frequency. It interfaces to a LIGO-designed real-time system through standard anti-aliasing equipment, and operated at a model rate of 64kHz. We hope that this engineering model will serve as a final step towards integration of SPI differential control between aLIGO's seismic platforms in order to reduce noise at 1Hz and below.

Files in Document:

• SWG_LVK_SPI_Engl_rev2.pdf (4.5 MB)

Topics:

• A+ Project
• Seismic Isolation
• Basic R&D

Authors:

• Alec Engl
• Sydney Yan
• Sina Koehlenbeck
• Brian Lantz

Keywords:

Seismic Isolation Seismic Platform Interferometer (SPI) LVK

Notes and Changes:

REV2: Includes analysis on readout noise limit done shortly after LVK meeting.