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Optical Layout Cavity Lengths. Input Mode Cleaner (IMC) IMC FSR = ~9 MHz Length = ~16.6 m = ~HAM1 to HAM3 separation Power Recycling Cavity (PRC) PRC FSR = 2 x IMC FSR = ~18 MHz Length = ~8.3 m = ~HAM3 to BSC2 separation Asymmetry = 0.2 m Signal Recycling Cavity (SRC) f = 180 MHz

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optical layout cavity lengths
Optical LayoutCavity Lengths
  • Input Mode Cleaner (IMC)
    • IMC FSR = ~9 MHz
    • Length = ~16.6 m = ~HAM1 to HAM3 separation
  • Power Recycling Cavity (PRC)
    • PRC FSR = 2 x IMC FSR = ~18 MHz
    • Length = ~8.3 m = ~HAM3 to BSC2 separation
    • Asymmetry = 0.2 m
  • Signal Recycling Cavity (SRC)
    • f = 180 MHz
    • Length = ~8.4 m = ~HAM4 to BSC2 separation
  • Fabry-Perot (FP) Arm Cavities
    • Length = ~4 km
  • Precise frequencies and lengths in the optical layout document
    • T010076-01
    • Folded interferometer layout pending

ADVANCED LIGO

headroom in ham chamber constrains mc rm placement
Headroom in HAM Chamberconstrains MC, RM placement
  • Available area dimensions as a function of table & suspension heights are defined in T000087-01

ADVANCED LIGO

optical layout criteria
Optical LayoutCriteria
  • Requires BS wedge angle > currently defined manufacturing limit

ADVANCED LIGO

optical layout issues limitations
Optical LayoutIssues, Limitations
  • Folded interferometer layout pending
  • Active thermal compensation system?
    • May require the addition of 1 or 2 phase plates in the PRC
    • May benefit from putting the AR side of the PRM into the PRC for common mode corrector
  • Single recycling cavity pick-off beam?
    • 3 in initial LIGO: ITMx, ITMy, BS
    • May require only one in advanced LIGO
  • Non-wedged ITMs?
  • Horizontal Wedges?
    • May be possible if a single RC pick-off is sufficient
    • May require (somewhat) larger SEI BSC tables
      • In fact, recommend going to maximum size square BSC SEI tables (limited by support tubes)
  • Suspension planform dimensions?
    • Layout is tight, need an estimate of SUS quad & triple base size to resolve

ADVANCED LIGO

suspension table area
Suspension Table Area?
  • Suspension
    • Quadruple prototype (shown at left)
    • Apparent planform dimensions: 700 X 1020 (lateral) mm
    • >> than assumed 330 X 420 (lateral) mm in layout

ADVANCED LIGO

generic requirements standards for subsystems
Generic Requirements & Standards for Subsystems
  • Collection of (or pointers to) the general requirements and standards which apply to all (or most) subsystems
    • Design standards
    • Review requirements
    • Documentation requirements
    • Configuration controls
    • Test requirements
    • EMC requirements
    • Vacuum compatible materials, processing
    • Etc.

ADVANCED LIGO

generic requirements standards for subsystems1
Generic Requirements & Standards for Subsystems

Table of Contents

1Introduction

1.1Purpose

1.2Scope

1.3Definitions

1.4Acronyms

1.5Applicable Documents

1.5.1LIGO Documents

1.5.2Non-LIGO Documents

2Review Requirements

2.1Design Reviews

2.2Approval & Release Process

3Configuration Control

3.1Design Configuration Control

3.2Interfaces Definition & Control

3.3Physical Configuration Control

4Documentation Requirements

4.1Documentation Numbering & Electronic Filing

4.2Design, Analysis & Test

4.2.1Design Requirements Document (DRD)

4.2.2Conceptual Design Document (CDD)

4.2.3Preliminary Design Document (PDD)

4.2.4Final Design Document (FDD)

4.2.5Technical Design Memorandum

4.2.6Test Plans and Procedures

4.2.7Prototype Test Plans & Results

4.3Fabrication and Process Specifications

4.4Engineering Drawings and Associated Lists

4.5Technical Manuals and Procedures

4.5.1Procedures

4.5.2Manuals

5Testing Requirements

5.1Form & Fit

5.2Assembly

5.3Function

5.4Performance

5.5Self-Test

5.6Installation

6Mechanical Characteristics & Standards

6.1Materials and Processes

6.2Welding and Brazing

6.3Bolted Joints & Threaded Fasteners

6.4Drawing Standards

6.5CAD Standards

6.6Interchangeability

6.7Workmanship

6.8Human Engineering

6.9Preparation for Delivery

6.9.1Preparation

6.9.2Packaging

6.9.3Marking

ADVANCED LIGO

generic requirements standards for subsystems2
Generic Requirements & Standards for Subsystems

6.10Assembly

6.11Installation

7Electrical Characteristics & Standards

7.1Grounding & Shielding

7.2EMI

7.3Cabling

7.4Connectors

7.5Bus Architecture

7.5.1EPICS control interface

7.5.2Workmanship

7.5.3Software Characteristics & Standards

7.6TBD

7.7GUI Human Engineering

8Vacuum Compatibility Requirements

8.1Form/Fit

8.2Tribology

8.3Materials

8.4Qualification

8.5Fabrication

8.6Cleaning

9Earthquake Requirements

9.1Structural Integrity

9.2Alignment

9.3Operation

10Quality Assurance

10.1Quality conformance inspections

10.1.1Inspections

10.1.2Analysis

10.1.3Demonstration

10.1.4Similarity

10.1.5Test

10.2Quality Confiormance Matrix

11Reliability

11.1Reliability Requirements

11.2Reliability Testing

12Maintainability

13Transportability

14Safety

ADVANCED LIGO

generic requirements standards for subsystems3
Generic Requirements & Standards for Subsystems
  • Basically the same as initial LIGO
    • Fill omissions, provide clarifications to initial LIGO requirements
    • Added requirements:
      • CAD Standards: SolidWorks & 3D preferred
        • AutoCad & 2D may be deemed acceptable on a case by case basis
      • Earthquake limit for seismic & suspension survival & alignment retention
      • For controlled documents: Source file archival required (in addition to Adobe AcroBat format)
      • All piece parts must be marked with part # (= drawing # - revision S/N)
  • Status of LIGO-E010123:
    • Outline completed
    • Content growing
    • Comments & suggestions welcome

ADVANCED LIGO