Auxiliary Optics System (AOS)

1. Auxiliary Optics System (AOS) Cost and Schedule Breakout Presentation NSF Review of Advanced LIGO Project Mike Smith, Phil Willems CIT

2. $2.76M $1.96M $0.66M change AOS Description & Deliverables $9.04M AOS is responsible for procuring, assembling, and testing: • Stray Light Control • Beam Dumps and Baffles for ghost beams • Arm Cavity Baffle for small angle scattered light, ITM, ETM • Errant Beam Baffles to protect SUS fibers • Attenuators for PO beams • Output Faraday Isolator • Thermal Compensation • Ring Heaters for recycling & arm cavity mirrors • CO2 Laser, shaped heating beam for ITM • Wavefront probe/sensor optical system for all COC mirrors • PO Mirror & Telescope • Suspended PO Mirror to extract BS & ITM PO beam for IFO alignment control • Non-suspended beam-reducing telescope and steering mirrors • Suspension for existing ETM Telescope change change

3. $1.07M $1.01M $0.83M $0.39M $0.14M AOS Description & Deliverables-contNo Significant Change • Initial Alignment System • Replace or upgrade existing surveying equipment Visible & IR laser autocollimator, theodolite, optical square, etc. • Optical Lever • New Optical Lever Transmitter & Receiver (insensitive to mirror displacement) for all suspended optics, additional piers • Photon Calibrator • Provide known impulse to ETM mirror for calibration, using external radiation pressure • Output Mode Matching Telescope • Procure Mirrors for suspended beam reducing telescope--dark port GW signal • Viewports • Procure Viewports for: IFO sensing beams, Video camera, chamber illum, optlev, TCS (Zn Se) • AOS is complete when all the elements are ready for installation

4. AOS Work Breakdown StructureUnchanged WBS for “Subsystem” is organized by sub-component; or by major subsystem and then by category of equipment; or by subcomponent and then by phase – procure, assemble sub-assemblies, integrate, and test.

5. AOS Schedule HighlightsNew • AOS is not on critical path • Schedule is driven by need to optimize resource use

6. AOS Detailed ScheduleNeed new slide with 1-2 mo schedule slip • Detailed schedule is available on Project website • http://www.ligo.caltech.edu/~advligo/aos/aos_current_progsched.pdf

7. AOS Milestones/InterfacesUnchanged

8. AOS Cost EstimatingChanged • Used the same standardized cost estimating approach used for initial LIGO • Contingency analysis enhanced by Monte Carlo simulation based on risk assessment. • Contingency estimate: see below* • Initial LIGO history & updated quotes used for labor/material cost basis of most items • Historical costs were validated with new quotations • New quotations for parabolic telescope/PO mirrors • Materials scaled by increased beam size as appropriate • Commissioned CO2 laser TCS recosted • Prototype cost basis for optical lever receiver and Hartmann sensors • Engineering cost estimate for TCS ring heaters • PO mirror suspension engineering estimate based on quad SUS prototype * For LIGO estimating, contingency was first estimated using a standard qualitative process to assign risk factors at the activity level for technical and procurement risk and at the WBS level for schedule risk. The additional risk factor resulting from the Monte Carlo analysis was added at the subsystem level. When you look at the cost book detail, the individual cost items have the same contingency value, even though we listed whether the estimate is a vendor quote or an engineering estimate. This is because the risk factors were evaluated at the activity level, not at the individual cost item.

9. AOS Cost to WBS Level 5Need a new slide

10. AOS Cost to WBS Level 6– Need a new slide

11. AOS Cost Book DetailsNeed a new slide • Detailed cost book information is available on Project website • http://www.ligo.caltech.edu/~advligo/aos/aos_current_cost_est.pdf

12. AOS Estimate ChangesNeed a new slide Revision AOS cost change as of 4/11/07 to the following: 4.07.4.1.1      38,746 increase (using a LOS to suspend the Faraday isolator instead of a SOS) 4.07.4.5.1      1,516,752 (an increase of 612,736 occurred because the ITMX PO mirror will be suspended like the BS PO mirror, which requires a double pendulum ) 4.07.4.5.2      18,081 (this is a first article PO Telescope housing that won't be reused, and was left off the cost sheet) 4.07.4.9        293,224 (slight cost reduction due to updated costs for mirrors) 4.07.4.A        333,011 (correction to match the figure on my 1/22/07 spreadsheet) The updated total equipment cost will be 5,537,119 (an increase of 523,914 over what is shown in slide 10) Replace these notes with a new note explaining the net decrease figure (was 1003735)—decrease due to change in quantity, increase due to suspending ITMX PO mirror, decrease due to using spherical mirror for BSPO telescope instead of parabolic mirrors.

13. Changes in Scope Since June 2006Dwight move the costed items • Suspend Output Faraday Isolator with modified LOS SUS • Suspend Cryopump Baffle • Suspend Cavity Beam Dumps from BSC Optics Table • Suspend Arm Cavity Baffles from BSC Optics Table • Suspend ITM Elliptical Baffles from BSC Optics Table • TCS Ring Heaters removed from compensation plates, installed on Test Masses • Errant Baffles, MC baffles costs moved to IO • Cameras and costs moved from ISC to AOS

14. AOS Response to Review Panel Recommendations • Recommendation: “The Panel encourages continuing the effort to improve TCS including a sensing method since it seems to be an effective way to control overall mode quality in the system. It provides a way to mitigate the parametric instability, the impact of which on the overall system is still not known.” • We have selected the Adelaide Hartmann sensor for Advanced LIGO TCS and incorporated it into the baseline design. Thermal control of parametric instability is currently under theoretical and experimental research at Gingin. • Recommendation: “The Panel encourages the design of the compensation plates.” • We have a baseline CP design, and have ordered a prototype to install at LASTI as part of an overall TCS test. • Recommendation: “The Panel encourages continuing the effort to qualify a second vendor for the parabolic mirrors.” • We have qualified a second vendor, Tydex, J. S. Co. of Saint Petersburg, Russia. Given their high quality and low price they are now our primary vendor.

15. AOS Staffing ProfileNew

16. AOS Risks and ConcernsUnchanged • Cost/Schedule increase/delay--absorption in the core optics may be anomalous • may need higher power TCS heating • may need to develop a scanning heater design as a backup • Cost/Schedule increase/delay- -acoustic parametric instability • make TCS more flexible to handle both API and thermal lensing

17. AOS Test Plans • Initial Alignment System • Similar to initial LIGO, no additional testing needed • Thermal Compensation System • Full sensor-compensator test planned for LASTI in 2008-9 • Additional testing will be done in Enhanced LIGO • Stray Light Control • BRDF (scattering) measurements of critical materials • Pickoff Mirrors, ETM Telescope, and Faraday Isolator SUS • Prototype tests during preliminary design phase • Photon Calibrator • Standalone test during preliminary design phase • Optical Levers • Mostly pre-tested in initial LIGO, new zoom lens design prototyped in 2004 • Viewports • Very basic elements, no test needed • Output Mode-Matching Telescope • Identical to Input Mode-Matching Telescope, without adaptive elements—will use IO test results