Auxiliary Optics Support System Design Requirements Document, Volume 2 Photon Calibrator

LASER INTERFEROMETER GRAVITATIONAL WAVE OBSERVATORY LIGO Laboratory / LIGO Scientific Collaboration LIGO-T0000xx-02-D ADVANCED LIGO 10/4/00 Auxiliary Optics Support System Design Requirements Document, Volume 2: Photon Calibrator 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 LIGO Project – MS 18-34 1200 E California Blvd Pasadena, CA 91125 Phone (626) 395-2129 Fax (626) 304-9834 E-mail: info@ligo.caltech.edu Massachusetts Institute of Technology LIGO Project – NW17-161 175 Albany St Cambridge, MA 02139 Phone (617) 253-4824 Fax (617) 253-7014 E-mail: info@ligo.mit.edu LIGO Hanford Observatory P.O Box 1970 Mail Stop S9-02 Richland, WA 99352 Phone 509-372-8106 Fax 509-372-8137 LIGO Livingston Observatory P.O Box 940 Livingston, LA 70754 Phone 225-686-3100 Fax 225-686-7189 http://www.ligo.caltech.edu/ Advanced LIGO LIGO-T000092-02-D Advanced LIGO LIGO-T000092-02-D Table of Contents INTRODUCTION .5 1.1 PURPOSE 1.2 PHOTON CALIBRATOR SCOPE 1.3 DEFINITIONS 1.4 ACRONYMS 1.5 APPLICABLE DOCUMENTS 1.5.1 LIGO Documents 1.5.2 Non-LIGO Documents GENERAL DESCRIPTION 2.1 PHOTON CALIBRATOR PERSPECTIVE 2.2 PHOTON CALIBRATOR AND PHOTON CALIBRATOR CONTROLS FUNCTIONS 2.3 PHOTON CALIBRATOR AND PHOTON CALIBRATOR CONTROLS CONSTRAINTS 2.4 ASSUMPTIONS AND DEPENDENCIES 2.4.1 Core Optics Parameters 2.4.2 Interferometer Design Parameters 2.4.3 Displacement Noise Parameters .8 2.4.4 ISC Interface Characteristics 2.4.5 Seismic Environment .8 REQUIREMENTS 3.1 PHOTON CALIBRATOR REQUIREMENTS 3.1.1 Photon Calibrator Characteristics 3.1.1.1 Photon Calibrator Performance Characteristics 3.1.1.2 Photon Calibrator Physical Characteristics 3.1.1.3 Photon Calibrator Interface Definitions 3.1.1.4 Photon Calibrator Reliability 10 3.1.1.5 Photon Calibrator Maintainability 10 3.1.1.6 Photon Calibrator Environmental Conditions 10 3.1.1.7 Photon Calibrator Transportability 11 3.1.2 Photon Calibrator Design and Construction .12 3.1.2.1 Materials and Processes 12 3.1.2.2 Photon Calibrator Interchangeability .13 3.1.2.3 Photon Calibrator Safety 13 3.1.2.4 Photon Calibrator Human Engineering 13 3.1.3 Photon Calibrator Assembly and Maintenance 13 3.1.4 Photon Calibrator Documentation .14 3.1.4.1 Photon Calibrator Design Documents 14 3.1.4.2 Photon Calibrator Engineering Drawings and Associated Lists .14 3.1.4.3 Photon Calibrator Technical Manuals and Procedures 14 3.1.4.4 Photon Calibrator Documentation Numbering .14 3.1.4.5 Photon Calibrator Test Plans and Procedures 14 3.1.5 Photon Calibrator Logistics 14 3.1.6 Photon Calibrator Precedence .15 QUALITY ASSURANCE PROVISIONS .16 4.1 GENERAL 16 4.1.1 Responsibility for Tests 16 4.1.2 Special Tests 16 4.1.2.1 Engineering Tests 16 4.1.2.2 Reliability Testing 16 4.1.3 Configuration Management 16 4.2 QUALITY CONFORMANCE INSPECTIONS 16 4.2.1 Inspections 16 4.2.2 Analysis 17 Advanced LIGO LIGO-T000092-02-D 4.2.3 Demonstration 17 4.2.4 Similarity .17 4.2.5 Test 17 PREPARATION FOR DELIVERY .18 5.1 PREPARATION 5.2 PACKAGING 5.3 MARKING 18 18 18 Appendices Table of Tables TABLE ENVIRONMENTAL PERFORMANCE CHARACTERISTICS 10 Table of Figures Advanced LIGO LIGO-T000092-02-D Introduction 1.1 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 1.2 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 1.3 Definitions 1.4 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 Advanced LIGO LIGO-T000092-02-D BSC - Beam Splitter Chamber TBD - To Be Determined APS - anti-symmetric port signal SPS - symmetric port signal rms - root-mean-square 1.5 Applicable Documents 1.5.1 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-T98010100D 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 1.5.2 Non-LIGO Documents Advanced LIGO LIGO-T000092-02-D General description 2.1 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 2.2 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 2.3 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 2.4 Assumptions and Dependencies 2.4.1 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