Terms and Definitions

A

AD

Applicable Document

Legally binding documents and reports

ADC

Atmospheric Dispersion Corrector

AIV

Assembly, Integration and Verification

To be replaced by AIT

AO

Adaptive Optics4

AIT

Assembly, Integration and Test

ANDES

ArmazoNes high Dispersion Echelle Spectroscopy

Name of the instrument

All documents

arcsec

Arc Second

B

BOL

Beginning of Life

C

CCD

Charged Coupled Device

Area detectors

CCS

Central Control System

CoG

Center of Gravity

CR

Coudé-room

Part of the ELT

CU

Calibration Unit

Subcomponent

D

E

EH

Entrance Hall

ELT

Extremely Large Telescope

ESO

European Southern Observatory

F

F2F

Fiber-To-Fiber link

In-fiber connection point

FDR

Final Design Review

Milestone of the project, controlled by ESO

FE I-IV

Front End I-IV

Pickup of the beam coming from the telescope.

FP

Fabry-Pérot

Etalon, Interferometer, Resonator in Literature

FSR

Free Spectral Range

Spectral range between two spectral features

FTS

Fourier-Transform Spectrograph

G

GPS

Global Positioning System

H

HCL

Hollow-Cathode Lamps

Wavelength calibration lamps

CU

HIRES

High Resolution Spectrograph

Outdated name of the instrument /project -> ANDES

I

IAA

Instrument Assembly Area at Armazones

ICD

Interface Control Document

ESO-Standard, that is used to define Interfaces and their Responsibility

IFU

Integral Field Unit

ILS

Instrumental Line Shape

See Definitions below

IP

Instrumental Profile

see also linespread function or ILS

IR

Infrared

J

K

L

LCS

Local Control System

LCU

Local Control Unit

LDP

Light Distribution Point

Connects, switches light sources to the OUP of the CU

LGS

Laser Guide Star

LUT

Look-Up table

M

mas

Milli-arcseconds

MS

Main Structure

MTBF

Mean Time Between Failure

N

NCR

No-Collapse Requirement

NGS

Natural Guide Star

O

OM

Observing Mode

OUP

Output Port

Fiber ports used in the CU → Optical Interface to the Fiber WP

P

PA

Product Assurance

PAE

Preliminary Acceptance Europe

ESO-controlled milestone of the project

PCF

Photonic Crystall Fibre

Used in the Astrocomb for spectral broadening

PD

Photodiode

PDR

Preliminary Design Review

ESO-controlled milestone of the project

PHL

Preliminary Hazard List

PI

Principal Investigator

PFS

PreFocal Station

PT

Product Tree

PTV

Peak To Valley

Q

QA

Quality Assurance

R

RBM

Rigid Body Motion

RD

Reference Documents

background references only.

rms

Root Mean Square

A statistical Value, see below

RP

Resolving Power

lambda/deltaLambda

S

SAR

System Architecture Review

SCaO

Single Conjugate Adaptive Optics

SCP

Service Connection Point

SE

Systems Engineer

SoW

Statement of Work

T

TBC

To be Confirmed

TBD

To be Defined (frequently To be Discussed)

TLR

Top Level Requirement

TRL

Technical Readiness Level

see definitions

TRS

Technical Requirement Specification

TSE

Thermal Self Emission

U

V

VIS

Visible Range of Light

(400 nm - 700 nm as defined by ISO Standards)

W

WBS

Work Breakdown Structure

WCS

World Coordinate System

WFS

WaveFront Sensor

WLM

Wavelength Marker

frequency-stabilized Lasers, used in the CU to anchor the wavelength solution

WP

Work Package

WPM

Work Package Manager

X

Y

Z

Nasmyth-platform

Platforms on both sides of the ELT with optical interface to the Nasmyth-train.

1

Basic principles observed and reported

2

Technology concept formulated

3

Experimental proof of concept

4

Technology validated in lab

5

Technology validated in relevant environment

→ Observatory on the mountain

6

Technology demonstrated in relevant environment

7

System prototype demonstration in operational environment

8

System complete and qualified

9

Actual system proven in operational environment