Actuator Noise Modeling Report

Document #:

JGW-T1503453-v14

Document type:

T

Submitted by:

Yuta Michimura

Updated by:

Yuta Michimura

Document Created:

30 Mar 2015, 20:05

Contents Revised:

31 Mar 2017, 11:02

DB Info Revised:

31 Mar 2017, 11:02

Abstract:

This report is to summarize the results of actuator noise modeling for the KAGRA suspensions. The modeling was done by using MATLAB Simulink based NoiseBudget script made by Chris Wipf.

The latest version is maintained in the KAGRA svn. Please download the latest version from
https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/kagranoisebudget/Suspensions/report/ActuatorNoise_ModelingReport.pdf

Actuator design summary:
http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/ActuatorDesign

Files in Document:

• ActuatorNoise_ModelingReport.pdf (1.2 MB)

Topics:

• Detector:Suspensions
• Detector:Seismic Isolation
• Detector:Interferometer Sensing and Control:Length Sensing and Control
• Activity:KAGRA

Authors:

• Yuta Michimura

Keywords:

SAS VIS actuator OSEM MIF

Notes and Changes:

-v11: updated for actuator design change (smaller magnets for BS TM, SRM TM; high power coil drivers for PRM TM/IM)
-v12: updated for OSEM calculation (JGW-T1503239) update; IM coil efficiencies updated for opposed magnets
-v13: updated to include Type-A simulation; included magnetic noise and quantum noise
-v14: included BF feedback for Type-A; corrected minor errors

Related Documents:

• JGW-T1100571: Recycler and Beam Splitter suspension structure
• JGW-T1302090: Type-A SAS Mechanical Model Parameters
• JGW-T1503239: OSEM Coil/Magnet/Flag Calculation
• JGW-T1503605: coil-magnet coupling measurement
• JGW-D1503503: High Power Coil Driver Board
• JGW-D1503507: Low Power Coil Driver Board
• JGW-T1402971: Seismic Spectrum in Kamioka Mine
• JGW-T1200913: KAGRA Main Interferometer Design Document
• JGW-T1504459: Magnetic noise calculation for BS (and ETM/ITM, PRM/SRM)
• JGW-G1605544: Measurement of Schumann Resonance
• JGW-G1605938: Actuator design of KAGRA cryogenic payload

Referenced by:

• JGW-T1504450: BS Actuator Design (including design for SRs and PRs)
• JGW-P1707051: Mirror actuation design for the interferometer control of the KAGRA gravitational wave telescope
• JGW-E1605035: VIS Document and Drawing Tree (BS)
• JGW-E1605517: MIF Documents and Drawings Tree
• JGW-T1910142: Noise and range calculations for using High Power Coil Driver for the test mass stage of cryopayload
• JGW-T2011661: Actuator modification for cryopayload