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

2. AOS Description & Deliverables
change
$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
$0.66M
$1.96M
change
$2.76M

3. AOS Description & Deliverables-cont No 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
$0.14M
$1.01M
$1.07M
$0.83M
$0.39M

4. AOS Work Breakdown Structure Unchanged
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 Highlights Unchanged
AOS is not on critical path
Schedule is driven by need to optimize resource use

6. AOS Detailed Schedule 1-2 month schedule slip
Detailed schedule is available on Project website

7. AOS Milestones/Interfaces Unchanged

8. AOS Cost Estimating Unchanged
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 used for labor/material cost basis of most items
New quotations for parabolic telescope/PO mirrors
Materials scaled by increased beam size as appropriate
Commissioned CO2 laser TCS cost
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 5 Costs have been revised, see Level 6

10. AOS Cost to WBS Level 6--Revisions

11. AOS Cost Book Details Costs revised 4/11/07, see slide 10
Detailed cost book information is available on Project website

12. AOS Estimate Changes Revised
Revision
AOS cost change as of 4/11/07 to the following:
      638,746 (using a LOS to suspend the Faraday isolator instead of a SOS)
      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 )
      18,081 (this is a first article PO Telescope housing that won't be reused, and was left off the cost sheet)
        293,224 (slight cost reduction due to updated costs for mirrors)
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)

13. Changes in Scope Since June 2006
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 assigned to IO
AOS is responsible for cameras—not costed yet

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 Profile Revised

16. AOS Risks and Concerns Changed
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 Thermal Compensation System
Similar to initial LIGO, no additional testing needed
Thermal Compensation System
Full sensor-compensator test planned for LASTI in
Stray Light Control
BRDF 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—will use IO test results