Terminology

Word/Acronym

Meaning/Description

Synonyms

BS

Beam Splitter

Center

The central part of the IFO, where PRC, SRC and BS are located.

Vertex, Central Part

ETM

End Test Mass. The mirrors suspended at the far ends of the long arm cavities.

End Mirror.

ETMX

End Test Mass of X arm.

ETMY

End Test Mass of Y arm.

IFO

I guess IFO actually means InterFerometer Observatory. But it is used to mean just interferometer, the core part of an interferometric gravitational wave detector.

ITM

Input Test Mass. The mirrors forming the arm cavities suspended close to the vertex.

Front Mirror, Near Mirror.

ITMX

Input Test Mass of X arm

ITMY

Input Test Mass of Y arm

PRC

Power Recycling Cavity

PRM

Power Recycling Mirror

PR2

Name of the folding mirror in the PRC, which is closer to the PRM.

PR3

Name of the folding mirror in the PRC, which is closer to the BS.

SRC

Signal Recycling Cavity. There is a philosophical dispute going on whether to call it SRC or SEC. SEC means Signal Extraction Cavity. Since we are going to operate the LCGT in RSE configuration, probably SEC is a better name.

SEC

SRM

Signal Recycling Mirror. The main argument against the use of SEC/SEM is to use the same terminology as LIGO. Since we will collaborate with LIGO a lot, regardless of we like it or not, it is just easier to use the same words.

SEM

SR2

Name of the folding mirror in the SRC, which is closer to the SRM.

SR3

Name of the folding mirror in the SRC, which is closer to the BS.

Vertex

The central part of the IFO, where PRC, SRC and BS are located.

Center, Central Part

X-arm

The Fabry-Perot arm on the transmission side of the BS. The use of the words listed in the synonyms column is prohibited as it creates great confusion. If we use the name X-arm persistently, people from Kamioka-Kogyo will follow the convention eventually.

In-line arm, 2nd tunnel, Sako-tunnel

Y-arm

The Fabry-Perot arm on the reflection side of the BS. The use of the words listed in the synonyms column is prohibited as it creates great confusion. If we use the name Y-arm persistently, people from Kamioka-Kogyo will follow the convention eventually.

Perpendicular arm, 1st tunnel, Mozumi-tunnel

Word/Acronym

Meaning/Description

Synonyms

ADC

Analog to digital converter.

DAC

Digital to analog converter.

BO

Binary output. Used for switching by 0V-5V output.

MEDM

GUI tool for digital system on X windows.

DTT

diagnostic test tool. Software on digital system, for FFT, swept sine measurement etc.

diaggui

dataviewer

Software on digital, used as multiple channel, low sampling oscilloscope.

foton

Digital filter composer.

Word/Acronym

Meaning/Description

Synonyms

Tank

A heavy military vehicle that has a large gun and runs on two metal belts fitted over its wheels.

Word/Acronym

Meaning/Description

Synonyms

Cold

A slight illness that makes it difficult to breathe through your nose and makes your throat hurt.

AFB

Adhesion Free Bonding (TM Onyx Opt.).

COP

Coefficient Of Performance

成績係数、動作係数

DB

Direct Bonding

直接接合

EFG

Edge-defined Film-fed Growth method

Stepanov method

FRP

Fiber Reinforced Plastics

繊維強化プラスティック

GMC

Gifford-McMahon Cryocooler

GM冷凍機

HCB

Hydro-Catalysis Bonding

HEM

Heat Exchange Method

DB

Multi Layer Insulation

多層断熱

PTC

Pulse Tube Cryocooler

パルス管冷凍機

SAV

Surface Activated Bonding

SI

Super Insulator

スーパーインシュレーター

VRS

Vibration Reduction Stage

減振ステージ

Word/Acronym

Meaning/Description

Synonyms

Damp

A word describing the very humid and wet environment of Kamioka mine.