Laser Interferometer Gravitational Wave Observatory



LIGO Laboratory / LIGO Scientific Collaboration

LIGO-T0000xx-02-D ADVANCED LIGO 10/4/00

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Auxiliary Optics Support System

Design Requirements Document, Volume 2:

Photon Calibrator

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Michael Smith, Phil Willems

Distribution of this document:

LIGO Science Collaboration

This is an internal working note

of the LIGO Project.

|California Institute of Technology |Massachusetts Institute of Technology |

|LIGO Project – MS 18-34 |LIGO Project – NW17-161 |

|1200 E. California Blvd. |175 Albany St |

|Pasadena, CA 91125 |Cambridge, MA 02139 |

|Phone (626) 395-2129 |Phone (617) 253-4824 |

|Fax (626) 304-9834 |Fax (617) 253-7014 |

|E-mail: info@ligo.caltech.edu |E-mail: info@ligo.mit.edu |

| | |

|LIGO Hanford Observatory |LIGO Livingston Observatory |

|P.O. Box 1970 |P.O. Box 940 |

|Mail Stop S9-02 |Livingston, LA 70754 |

|Richland, WA 99352 |Phone 225-686-3100 |

|Phone 509-372-8106 |Fax 225-686-7189 |

|Fax 509-372-8137 | |



Table of Contents

1 Introduction 7

1.1 Purpose 7

1.2 Scope 7

1.2.1 Photon Calibrator 7

1.2.2 Photon Calibrator Controls. 7

1.3 Definitions 7

1.4 Acronyms 8

1.5 Applicable Documents 9

1.5.1 LIGO Documents 9

1.5.2 Non-LIGO Documents 9

2 General description 10

2.1 Specification Tree 10

2.2 Photon Calibrator and Photon Calibrator Controls Perspective 11

2.3 Photon Calibrator and Photon Calibrator Controls Functions 12

2.4 Photon Calibrator and Photon Calibrator Controls Constraints 12

2.5 Assumptions and Dependencies 12

2.5.1 Core Optics Parameters 12

2.5.2 Interferometer Design Parameters 13

2.5.3 ISC Interface Characteristics 13

2.5.4 Seismic Environment 14

3 Requirements 15

3.1 Photon Calibrator and Photon Calibrator Controls Requirements 15

3.1.1 Introduction 15

3.1.2 Photon Calibrator and Photon Calibrator Controls Characteristics 15

3.1.2.1 Photon Calibrator and Photon Calibrator Controls Performance Characteristics 15

3.1.2.2 Photon Calibrator Physical Characteristics 16

3.1.2.3 Photon Calibrator Interface Definitions 16

3.1.2.4 Photon Calibrator Reliability 17

3.1.2.5 Photon Calibrator Maintainability 17

3.1.2.6 Photon Calibrator Environmental Conditions 17

3.1.2.7 Photon Calibrator Transportability 18

3.1.3 Photon Calibrator Design and Construction 19

3.1.3.1 Materials and Processes 19

3.1.3.2 Photon Calibrator Workmanship 20

3.1.3.3 Photon Calibrator Interchangeability 20

3.1.3.4 Photon Calibrator Safety 20

3.1.3.5 Photon Calibrator Human Engineering 20

3.1.4 Photon Calibrator Assembly and Maintenance 21

3.1.5 Photon Calibrator Documentation 21

3.1.5.1 Photon Calibrator Specifications 21

3.1.5.2 Photon Calibrator Design Documents 21

3.1.5.3 Photon Calibrator Engineering Drawings and Associated Lists 21

3.1.5.4 Photon Calibrator Technical Manuals and Procedures 21

3.1.5.5 Photon Calibrator Documentation Numbering 22

3.1.5.6 Photon Calibrator Test Plans and Procedures 22

3.1.6 Photon Calibrator Logistics 22

3.1.7 Photon Calibrator Precedence 22

3.1.8 Photon Calibrator Qualification 22

4 Quality Assurance Provisions 23

4.1 General 23

4.1.1 Responsibility for Tests 23

4.1.2 Special Tests 23

4.1.2.1 Engineering Tests 23

4.1.2.2 Reliability Testing 23

4.1.3 Configuration Management 23

4.2 Quality conformance inspections 23

4.2.1 Inspections 23

4.2.2 Analysis 24

4.2.3 Demonstration 24

4.2.4 Similarity 24

4.2.5 Test 24

5 Preparation for Delivery 25

5.1 Preparation 25

5.2 Packaging 25

5.3 Marking 25

6 Notes 26

Appendices

Appendix A Quality Conformance Inspections 99

Table of Tables

Table 1 Environmental Performance Characteristics 16

Table 2 Quality Conformance Inspections 26

Table of Figures

Figure 1: Overall LIGO detector requirement specification tree 10

Introduction

1 Purpose

The purpose of this document is to describe the design requirements for the Auxiliary Optics Subsystems (AOS) Photon Calibrator. Primary requirements are derived (“flowed-down”) from the LIGO principal science requirements. Secondary requirements, which govern Detector performance through interactions between AOS and other Detector subsystems, have been allocated by Detector Systems Engineering.

2 Photon Calibrator Scope

The Photon Calibrator subsystem will provide a light beam that actuates the End Test Masses (ETMs) of the interferometer by means of radiation pressure. It will take its control signals from the Length Sensing and Control system. All software and electronics necessary to control the Photon Calibrator subsystem to faithfully respond to the control signals provided by the Length Sensing and Control system are part of the scope. This subsystem forms part of the interface between ISC and SUS. The Photon Calibrator does not send or receive any control signals from the SUS subsystem. No optic in LIGO other than the ETMs will have Photon Calibrators.

3 Definitions

4 Acronyms

LIGO - Laser Interferometer Gravity Wave Observatory

IOO - Input Optics

DRD - Design Requirements Document

SRD - Science Requirements Document

ETM - End Test Mass in the interferometer

AR - Antireflection Coating

HR - Reflective mirror coating

SEI - Seismic Isolation subsystem

SUS - Suspension subsystem

ISC- Interferometer Sensing and Control

LSC - Length Sensing and Control

COC - Core Optics Components

ASC - Alignment Sensing and Control

IFO - LIGO interferometer

HAM - Horizontal Access Module

BSC - Beam Splitter Chamber

TBD - To Be Determined

APS - anti-symmetric port signal

SPS - symmetric port signal

rms - root-mean-square

5 Applicable Documents

1 LIGO Documents

Core Optics Support Design Requirements Document lIGO-T970071-03-D

Core Optics Components DRD: LIGO-Exxx

ISC Reference Design

Seismic Isolation DRD, LIGO-T960065-02-D

Locally Damped Test Mass Motion, LIGO-T970092-00-D

Advanced LIGO Detector Design Requirements Document: LIGO-Exxx

Core Optics Support Conceptual Design, LIGO-T970072-00-D

COS Beam Dump and Stray Light Baffle Revised Req. and Concepts LIGO-T980103-00-D

Up-conversion of Scattered Light Phase Noise from Large Amplitude Motions, LIGO-T980101-00D

Effect of PO Telescope Aberrations on Wavefront Sensor Performance, LIGO-T980007-00-D

LIGO Vacuum Compatibility, Cleaning Methods and Procedures, LIGO-E960022-00-D

ASC Optical Lever Design Requirement Document, LIGO-T950106-01-D

LIGO-E000007-00

LIGO Naming Convention (LIGO-E950111-A-E)

LIGO Project System Safety Management Plan LIGO-M950046-F

LIGO EMI Control Plan and Procedures (LIGO-E960036)

Derivation of CDS Rack Acoustic Noise Specifications, LIGO-T960083

Specification Guidance for Seismic Component Cleaning, Baking, and Shipping Preparation (LIGO-L970061-00-D)

COS Preliminary Design T980010-01-D

2 Non-LIGO Documents

General description

1 Photon Calibrator Perspective

Radiation pressure provides a potentially very well-characterized force on a mirror that can be used to calibrate the interferometer response to gravitational waves. This calibration is complementary to other techniques, such as calibration through error signal analysis of optics swinging through fringes. The Photon Calibrator provides this force and the means to sufficiently characterize it.

2 Photon Calibrator and Photon Calibrator Controls Functions

The Photon Calibrator shall reflect off a surface of the ETM a laser beam whose power is controlled by signals provided by the ISC subsystem. This power will itself be measured and stored for data analysis.

The main purpose of the Photon Calibrator is to provide actuation for on the ETM as dictated by ISC for calibration purposes.

3 Photon Calibrator and Photon Calibrator Controls Constraints

LIGO must operate continuously; therefore this subsystem must be designed with high reliability and low mean time to repair. As this subsystem introduces light into the interferometer vacuum chamber, it must not introduce significant stray light at the interferometer sensing ports, especially the ASP.

4 Assumptions and Dependencies

1 Core Optics Parameters

The following ETM parameters were taken from the Core Optics Components Design Requirements Document: LIGO-T000127-01-D.

|Physical Quantity |ETM |

|AR coating @ 1060 nm | ................
................

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