VIS

Vibration Isolation System is the hardware infrastructure for the main optics in the KAGRA interferometer.

• VIS meeting: From 14:00 (JST) on every Friday - Meeting Page

VIS Upgrades

Upgrade Page

Instruments

Suspension types

Type-C

Payload

Actuator design summary

Design Change Logs

Suspended optics

The optics in the KAGRA interferometer are often called their acronyms/abbreviations¹ listed below. The linked pages from the optics' names show the specification of each component of the suspension systems.

• Arm cavity
  • ETMX
  • ETMY
  • ITMX
  • ITMY
• Beam splitter (BS)
• Signal recycling cavity
  • SRM
  • SR2
  • SR3
• Power recycling cavity
  • PRM
  • PR2
  • PR3
• Input optics
  • IMC
  • IMMT1
  • IMMT2
• Output optics
  • OMMT1
  • OMMT2
  • OSTM
  • OMC
• Auxiliary optics
  • TMSX
  • TMSY

Mechanics

Tower

• Pre-isolator
  • Inverted Pendulum (IP)

  • Top GAS Filter (TF²)

• Standard GAS Filter (SF)
• Bottom GAS Filter (BF)
• Magnetic damper

Payload

• Cryogenic payload (CRYp): The bottom 4 stages in Type-A suspension, branch recoil-mass chain
  • Platform (PF)
  • Marionette (MN)
  • Intermediate Mass (IM)
  • Test Mass (TM)
• Room-temperature payload: The bottom 2 stages in Type-B and Type-Bp suspension, parallel recoil-mass chain
  • Intermediate Mass (IM)
  • Test Mass (TM)

Electronics

A list of local sensors, actuators, and motors equipped by the suspension systems.

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• LVDT - Linear Variable Differential Transducer/Transformer, displacement sensor

  • [Derivative] Bottom-filter LVDT (BF LVDT)

• Geophone - inertial velocity sensor

• Accelerometer -

• OSEM - Optical Sensor and Electromagnet

• Optical Lever

• Fishing rod

• Picomotor

Signal processing

• Related subgroups: AEL, DGS

All the sensor readouts, actuation signals, and motor operation commands are governed with the KAGRA digital signal processing system provided by DGS subgroup.

Real-time front-end model

• See also: Real-time model development

Apps

Installation

• Installation Procedure

• Misc. Installation Work Information

• Tasks from iKAGRA to bKAGRA

Real Time Model Development

• Real-time Model Development

Operation

• Operation Manual

VIS Introductioon

• Introduction materials for VIS

VIS Commissioning

• Type-A Commissioning

Archives

• Photos

Old Weekly EVO Meeting

• This meeting is suspended.

Past minutes

Subgroup

Members

• Chief: R. Takahashi
• Member： N. Ohishi, H. Ishizaki, F. E. Pena Arellano, M. Barton, N. Hirata, R. Flaminio, Y. Aso, T. Akutsu , E. Tapia (NAOJ),

  T. Sekiguchi, K. Yamamoto, T. Uchiyama (ICRR), R. DeSalvo (Univ. of Sannio), E. Majorana (INFN Rome), J. van den Brand, E. Hennes, A. Bertolini, J. van Heijningen, K. Agatsuma (NIKHEF)

Communication info

• Mailing list: [kagra-seis]