Differences between revisions 218 and 258 (spanning 40 versions)

VIS

Vibration Isolation System is the hardware infrastructure for the main optics in the KAGRA interferometer. The VIS subgroup works for ...

Meetings	Management	For users	For developpers
Weekly VIS Meeting	Schedule
Extraordinary Meetings

Tall suspensions	Type-A				Type-B				Type-Bp
Tall suspensions	ETMX	ETMY	ITMX	ITMY	BS	SRM	SR2	SR3	PRM	PR2	PR3

Short suspensions	Type-C								TMS-VIS
Short suspensions	MCE	MCI	MCO	IMMT1	IMMT2	OMMT1	OMMT2	OSTM	TMSX	TMSY

Mechanics	Sensors	Actuators/Motors	Other subsystem interfaces	Apps
Pre-Isolator	LVDT	Voice Coil Actuator	AEL interfaces	SUMCON
			DGS interfaces	ModelPlotter

VIS Upgrades

Upgrade Page

Instruments

Suspension types

Actuator design summary

Design Change Logs

Real-time front-end model

See also: Real-time model development

Apps

Installation

Real Time Model Development

Real-time Model Development

Operation

Operation Manual

VIS Introductioon

Introduction materials for VIS

VIS Commissioning

Type-A Commissioning

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]

-  ⇤ ← Revision 218 as of 2020-03-03 13:14:35 → 
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- * '''VIS meeting''': From 14:00 (JST) on every Friday - [[KAGRA/Subgroups/VIS/MeetingNAOJ|Meeting Page]]
+||<#1e50a2 style="color:#ffffff; text-align:center;"> '''Meetings'''||<#1e50a2 style="color:#ffffff; text-align:center;"> '''Management'''||<#1e50a2 style="color:#ffffff; text-align:center;"> '''For users'''||<#1e50a2 style="color:#ffffff; text-align:center;"> '''For developpers''' ||
||[[KAGRA/Subgroups/VIS/MeetingNAOJ|Weekly VIS Meeting]] || [[KAGRA/Subgroups/VIS/Schedule|Schedule]] ||  ||  ||
||[[KAGRA/Subgroups/VIS/ExtraMeetings|Extraordinary Meetings]] ||  ||  ||  ||
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-||<style="text-align:center; "> '''Suspension types''' ||<style="text-align:center; "> '''Optics''' ||
||<|4> [[KAGRA/Subgroups/VIS/TypeA|Type-A]] || ||
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||<|4> [[KAGRA/Subgroups/VIS/TypeB|Type-B]] || ||
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||<|4> [[KAGRA/Subgroups/VIS/TypeBp|Type-Bp]] || ||
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+||<#1e50a2 |2 style="color:#ffffff; text-align:center;"> '''Tall suspensions''' ||<:-4 style="font-weight:bold;"> [[KAGRA/Subgroups/VIS/TypeA|Type-A]] ||<:-4 style="font-weight:bold;"> [[KAGRA/Subgroups/VIS/TypeB|Type-B]] ||<:-3 style="font-weight:bold;"> [[KAGRA/Subgroups/VIS/TypeBp|Type-Bp]] ||
|| [[KAGRA/Subgroups/VIS/Optics/ETMX|ETMX]] || [[KAGRA/Subgroups/VIS/Optics/ETMY|ETMY]] || [[KAGRA/Subgroups/VIS/Optics/ITMX|ITMX]] || [[KAGRA/Subgroups/VIS/Optics/ITMY|ITMY]] || [[KAGRA/Subgroups/VIS/Optics/BS|BS]] || [[KAGRA/Subgroups/VIS/Optics/SRM|SRM]] || [[KAGRA/Subgroups/VIS/Optics/SR2|SR2]] ||[[KAGRA/Subgroups/VIS/Optics/SR3|SR3]] || [[KAGRA/Subgroups/VIS/Optics/PRM|PRM]] || [[KAGRA/Subgroups/VIS/Optics/PR2|PR2]] || [[KAGRA/Subgroups/VIS/Optics/PR3|PR3]] ||
||<:-11> ||
||<#1e50a2 |2 style="color:#ffffff; text-align:center;"> '''Short suspensions''' ||<:-8 style="font-weight:bold;"> [[KAGRA/Subgroups/VIS/Type-C|Type-C]]||<:-2 style="font-weight:bold;"> [[KAGRA/Subgroups/VIS/TMS-VIS|TMS-VIS]] ||
|| [[KAGRA/Subgroups/VIS/Optics/MCE|MCE]] || [[KAGRA/Subgroups/VIS/Optics/MCI|MCI]] || [[KAGRA/Subgroups/VIS/Optics/MCO|MCO]] || [[KAGRA/Subgroups/VIS/Optics/IMMT1|IMMT1]] || [[KAGRA/Subgroups/VIS/Optics/IMMT2|IMMT2]] || [[KAGRA/Subgroups/VIS/Optics/OMMT1|OMMT1]] || [[KAGRA/Subgroups/VIS/Optics/OMMT2|OMMT2]] || [[KAGRA/Subgroups/VIS/Optics/OSTM|OSTM]] || [[KAGRA/Subgroups/VIS/Optics/TMSX|TMSX]] || [[KAGRA/Subgroups/VIS/Optics/TMSY|TMSY]] ||
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-<<TableOfContents(3)>>
+||<#1e50a2 style="color:#ffffff; text-align:center;"> '''Mechanics''' ||<#1e50a2 style="color:#ffffff; text-align:center;"> '''Sensors''' ||<#1e50a2 style="color:#ffffff; text-align:center;"> '''Actuators/Motors''' ||<#1e50a2 style="color:#ffffff; text-align:center;"> '''Other subsystem interfaces''' ||<#1e50a2 style="color:#ffffff; text-align:center;"> '''Apps''' ||
|| [[KAGRA/Subgroups/VIS/Mechanics/Pre-Isolator|Pre-Isolator]] || [[KAGRA/Subgroups/VIS/Sensors/LVDT|LVDT]] || [[KAGRA/Subgroups/VIS/Actuators/VoiceCoilActuator|Voice Coil Actuator]] || [[KAGRA/Subgroups/VIS/AELInterfaces|AEL interfaces]] || [[KAGRA/Subgroups/VIS/Apps/SUMCON|SUMCON]] ||
||  ||  ||  || [[KAGRA/Subgroups/VIS/DGSInterfaces|DGS interfaces]] || [[KAGRA/Subgroups/VIS/Apps/ModelPlotter|ModelPlotter]] ||
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+[[KAGRA/Subgroups/VIS/TypeA|Type-A]]
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-=== Suspended optics ===

The optics in the KAGRA interferometer are often called their acronyms/abbreviations<<FootNote(Please mind also that we call the vacuum chambers or clean booths in a similar manner.)>> 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 (TF<<FootNote(This abbreviation should be avoided because it often refers to rather ''transfer function''.)>>)
 * 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.

==== 

 * '''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'': [[KAGRA/Subgroups/AEL|AEL]], [[KAGRA/Subgroups/DGS|DGS]]

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

VIS