Advanced LIGO UK share technical specification and parameter list. Justin Greenhalgh

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1 See revision history at end. dvanced LIGO UK share technical specification and parameter list. Justin Greenhalgh June, version 03, following further discussions /JH. ction items have highlights Last update 9 June Check WP number given for each line. Key for source : SD = T Cavity optics DD = T versal SUS D Gen = E Generic requirements for subsystems = E and sub-documents; interface control document set.??? = currently unclear (to Justin) = ernal to SUS equirement Current values number, WP affected, subject Performance requirements P1. (all) Noise performance etc P2. (all) ssumed SEI performance P3. (3,4) The lower frequency cutoff Source (see above) other notes Verif (see below) ction See table 2 SD Derived from science spec. 2*10e-13 m/rt Hz at 10Hz in both all three directions Vertical modes 12 Hz or lower, observation possible down to 10 Hz SEI E D. Needed to decide how good the SUS transfer functions must be to meet the science spec. See also table 2.??? See T (esp section 6) and T This will be fed into the design by Norna as part of her work. Deadline Printed on 09/06/ at 3:58 PM Page 1 of 15

2 P4. (all) Technical noise 1/10 of thermal noise for each contribution. Contributions include wire rubbing at clamps, sensor noise in OSEMs, electronic noise from local and global control, thermal noise from blade internal resonances and silicate bonds. SD It is not clear how the design can be tested for this requirement. See also LUKGL0005., P5. (3,5) ETM/ITM Silica with sapphire fallback??? Is there a OD on this? test mass material P6. (3) Separate CP CP is part of ITM SUS??? OD M P7. (3) Material of ll metal except test mass, test T010103? masses reaction mass, penultimate mass P8. (3,5) Wedge angles on COC masses Will vary from mass to mass and location to location. ange will be +/- (TBD~10) mad. COC T ( to revise this document and transfer numbers to ) I P8a Wedge angles on ETM reaction mass P9. pitch angles on COC masses Yes to match those on the ETM. Wedge on ETM will be small. Will vary from mass to mass and location to location. ange will be +/- (TBD~10) mad. Design requirements D1.1. (all) Mass ITM = 418kg limits ETM=418 kg ITM+FM=710.5kg BS=306.9kg D1.2. (3,4) OSEM mass TBD COC SEI UK- Printed on 09/06/ at 3:58 PM Page 2 of 15 T ( to revise this document and transfer numbers to ) E Note we must not just stay BELOW these: any significant variation must be agreed. T also refers. CEIT to comment on current mass for C Ptype structure. for put into lso affects HM SUS if they use the same design., T CEIT End June End June 15 June 8 June,T JSG End

3 D2..1 (3) C of G and moment of inertia requirements D2.2 (3) C of G on suspended masses D3. (3) Structure frequencies the 150Hz issue Overall: Should reflect numbers given in table at back of E For each suspended mass: must agree with modelling work. TBD US SEI SEI D4. (3) Envelope TBD SYS D5. (3) eaction chain masses D6. (3) Wire clamp mass D7. (3) Stress limits in blades It is likely these will be made the same as the corresponding main chain masses but they do not have to be. The exceptions are the CP which is not the same as the ITM TM and the PU which is not the same as the ITM PU. Mass should be minimised but up to 100g seems OK for the top stage blades. E Needs mass of OSEMS as input. T & T Need to ensure Norna approves final values. Needs mass of global OSEMs as input. Latest in T to complete heroic modelling task. Not in Dennis s optics paper T D + to update E to include envelopes (note the ITM that includes an FM will not be done for Jun deadline) If they are not the same then the analysis given in T would have to be redone. This is being done for the CP chain, in T Txxxx (Justin blade FE calcs). evisit, possibly using s analysis in T Tentative use 55% of yield. 2 Virgo papers referred to in Txxxxx (Justin) T has 951 MPa in the top blades. Txxxx (blade ctte) Blade committee to confirm. JSG to Printed on 09/06/ at 3:58 PM Page 3 of 15, T,T mid June 8 June, JSG End Jul JSG End June

4 D7.1 Stress limits in clamps D8. (3) Stress limits in wires D9.1 (3) Blade internal modes D9.2 blade damping D10. (3) Wire violin mode damping D11. (3) Blade matching Currently use 55% of yield but bake under load before use. Still under discussion currently bake under load before use. Must not contribute noise in violation of P4 above. equires damping at UIM for current ETM/ITM design Make provision for blade dampers on all blades on noise prototype Provide mounting points for violin mode dampers in the fibre/ribbons. No sharp requirements identified in asymmetry calculations. Use +/- 1.5% max difference in a pair, target +/- 0.5%. ISC convene + fill in missing doc numbers above Blade committee to confirm. JSG to convene Blade committee to confirm. JSG to convene Norna s note LUKGL0010a. See also calculation of effects in T (Justin FE) and more recent note from Norna T Discussion still ongoing unlikely to be required for blades above the UIM. Decision on blade damping to be made once CP tests are done. T section 6. Will require E2E modelling to resolve. See also 4 and presentations at March LSC, and Txxxx note of Norna and Mark B., JSG End June, JSG End June N SYS forum,, T D13. (3) OSEM No specific requirements mounting rigidity D14. (3,4) OSEM Coil housing (OSEM head) to be See T , T electrostatic buildup metal. ISC D15. Vacuum requirements D15.1 (3,4,5) Materials allowed and or E (materials), mid Printed on 09/06/ at 3:58 PM Page 4 of 15 End pril 2006

5 prohibited Gen (needs updating) June or Gen D15.2 (3,4,5) Processes allowed and prohibited E (procedures). See also from of 17 Feb which references M C and L The is in addendum 3 to M D15.3 cleaning and baking of OSEMs greed processes or Gen Given in E SM to cite in OSEM documents. JH to add to D15.4 Welding Processes Gen E sections 1 to 5.2 D16.1 (3,4,5) Thread types D16.2 (all) drawing dimensions D17. (3,5) ETM + ITM test masses mass and dimensions D18. (3,5) Beamsplitter mass and dimensions Use imperial thread sizes. Use silver-plated screws and oversize tapped holes in all invacuum parts. Use nitronic inserts as an option. Use mm dimensions or inch with mm dual dimensions Fused Silica baseline: 340mm diameter by 200 mm thick Sapphire fall back: 314mm diameter by 130mm thick Silica, 37cm by 6cm, 95mm flat or Gen or Gen COC COC Printed on 09/06/ at 3:58 PM Page 5 of 15 E T greement at Grey areas meeting LSC March. Drawing requirements document E M See T for mass. Get OD M signed; Put in Concept only. T T needs updating. OD needed Confirmed in from Garilynn via Janeen 3 jun JH SM JH Garilyn n Billingsl ey 8 June OSEM D July 8 June 8 Jun

6 D19 (3,5) Folding mirror mass and dimensions D20. (3,5) Compensator plate size + mass D21. (3,4,5) Clearance for light paths D22. (3,4,5) Earthquake survival D22.2 transport shock loads D23. (3,5) Wire or fibre breakage D24. (4) EMC generation D25. (4) EMC ability to withstand D26. (4) OSEM force capability D27. (4) OSEM detector noise performance D28. (3,4) OSEM active range Same as BS COC OD M TBD Phil Willems is working on this. to check status. There are none other than the main beam SYS Lateral 0.4 or 0.5g. Gen pril. Needs firming up with two sets of figures (survival and continued operation) mid June,? 8 June TBD Especially during loading and unloading. Likely to be in caged condition. Put in., JH 8 June Must be able to withstand wire Needs stating if not already there JH 8 june or fibre breakage Provisions in E and E Provisions in E and E Gen + Gen + s G ISC 3E-10 m/root(hz) at 1-10 Hz. SYS 0.7mm peak-peak target. OSEM -SUS Should be in Bham + T para E SM Should be in Bham SM G discusses. See also T OSEM review outcome document? JSG to verify source document, (T?) JSG Noted in E D29. (3,4) OSEM TBD int Needs better understanding of JSG End Printed on 09/06/ at 3:58 PM Page 6 of 15 8 June 8 June End Jun

7 dead-reckoning alignment D30 (3) ccuracy of gap between TM and test reaction mass D31 nti-glint coating D32 Flexibility D33 fibre ends D34 electrostatic actuator force capability D34.1 ESD drive satellite box constraints D35 axis system D37 Static/antistatic requirements on earthquake stops Gap size accurate to +/- 0.5mm, parallel to +/ mm. (Could be, for example, 5mm at top and 4.5 at bottom or 5.5 at left and 5 at right.) TBD Design must be reasonably easy to modify to take alternate test mass material Drum ended for wires supporting top mass and UI mass. Currently building a dual-range drive which allows up to xxxv (high range) and xxv 9low range) Power output, size, fans allowed or not X along the laser path Z upwards vertical Y - transverse? Gen or SYS Gen or ISC issues (by JSG) To allow ES actuation to work properly. KS of 6 Jun refers. ug to chase Mike Smith mid jun T T ctive area of work Part of current design work Completely unknown and unknowable until E2E studies done. - KS and SYS forum End???? to pronounce? Mid Jun See Mike s note T See T for translation to others systems. TBD int JSG to keep watching brief. Some experiments in progress. Note also from of 17 Feb re Flourel in E The is in addendum 3 to M equirements given in E (Janeen 3 jun ) Printed on 09/06/ at 3:58 PM Page 7 of 15 JSG End

8 D38 how much ECD, on which axes D39 Sensors on OSEMS TBD Noise prototype has sensors on all OSEMs. Subsequent suspensions have no sensors on global control OSEMs. Leave a row blank to insert above djustment and alignment requirements 1. (3,4) djustments how much do we need to allow for alignment after installation 2. (3,4) with what resolution do we need to be able to make the alignment in 1? 3. (3,4) OSEM range required by dligo after provision has been used up in internal alignment 4 Yaw a few mad range (TBC) Pitch a few m ad range (TBC) ISC ISC 10 micro adians. +/ md ccuracy of spring constants, masses etc must Keep d distance correct to +/- 0.5mm. Printed on 09/06/ at 3:58 PM Page 8 of 15 KS has made an interim suggestion ( 11 may ). Needs KS to finish the document and then get approval from M Barton of the inferred control system requirements. exchanges pril 3 & 4, and subsequent SYS meeting. Needs documenting. OD needed () See draft in M addendum 1., Derived from G page 10, G page 9., Need to ensure that the predicted performance is OK with the given d deviations., KS, M Barton, End Jun 8 Jun

9 5. (4) Location of test mass (to interact with beam) Xxxx mm below SEI table SYS 6 ttachment of targets to include centre height of optic in document. 8 jun OD to complete and issue End jun ssembly requirements S1. emoved S2 (3) Optics Optic surfaces to be covered at protection during all times except when access to assembly optical surfaces is required. Operations requirements Operations requirements Need to follow the requirements under many headings COC OD refers. Design will be joint between SUS and COC. Part of assembly tooling. versal SUS requirements doc T D JSG to detail these specifically /JH key ones missing? O1. (3,4,5) MTBF Put numbers in here? Wed 02/07/ :07 (Coyne). Update to O2. (3,4,5) epair Target 1: must be possible to? May need revision as the design capabilities replace any fibre or ribbon in the progresses. fibre, ribbon vacuum tank O3. (3,4,5) epair capabilities wire, O4. (3,4,5) epair capabilities - OSEM O5 OSEM conditioning Target 2: must be possible to replace any wire in the vacuum tank Target 3: must be possible to replace any OSEM in the vacuum tank?? May need revision as the design progresses. May need revision as the design progresses. JSG /J H JH End Jun 8 Jun 8 June TBD??? Bham to specify OSEM testing and, T, Bham OSEM conditioning regimes D O6. (3,4) OSEM Must not deleteriously affect int Mark Barton , T LUK OSEM Printed on 09/06/ at 3:58 PM Page 9 of 15

10 eddy current damping detector performance Needs developing. LUK need to come a conclusion. D July erface requirements IF 1 (all) emoved emoved IF 2 (3,4) WP3 to WP4 See xxxxxx IF 3. (3,5) WP3 to WP5 See xxxxxx IF 4. (4,5) WP4 to WP5 identified IF 5.1 Baffles attachment TBD assumed easily added later IF 5.2 Baffles mass Baffles = negligible mass IF 5.3 ing heater attachment IF 5.4 ring heater mass IF 6 interface to SEI table Verification: : eview of design data : analysis T: test I: inspection TBD assumed easily added later ing heater = 1 kg 3/8 UNF holes on 1 pitch. SEI TMH to discuss with Phil Willems (heater) and Mike Smith (baffles) to confirm design assumptions 15.1 to 15.4 (and see T050005) TMH to discuss with Phil Willems (heater) and Mike Smith (baffles) to confirm design assumptions 15.1 to 15.4 OD required. Note dog clamps for SUS are in SUS scope. (effect) TMH TMH End Jul 15 jun End Jul 15 jun 8 jun List of applicable documents now at web page: Printed on 09/06/ at 3:58 PM Page 10 of 15

11 Justin to check for inclusion: Earthquake requirements See from Dennis Printed on 09/06/ at 3:58 PM Page 11 of 15

12 Table 1 Basic numerical performance requirements of suspension systems within LUK scope. Source for most numbers is LIGO-T Cavity Optics Suspensions Subsystem DD, Willems et al, Oct 2001 which also contains extensive explanatory text. Tables 1, 2, 4, and 5 of that reference apply. Longitudinal V Transverse ETM, ITM BS FM CP at f crit (1) Falling as 1/f^n, where n is at f crit at 100Hz at f crit at 100Hz LL TBD TM internal (2) 5E-20 m / Hz ~1 Pendulum 1E-19 m / Hz ~2 Technical 1/10 of thermal above f cutoff (3) Seismic noise 1E-19 m / Hz >4 Derived SUS 5E-7 isolation (4) Thermal 1E-16 m / Hz ~2 Technical 1/10 of thermal above f cutoff Seismic noise 3.3E-17 m / Hz >4 Derived SUS 1.7E-4(5) isolation(4) Thermal 1E-17 m / Hz ~2 Technical 1/10 of thermal above f cutoff 2E-17 m / Hz for all sources 6E-19 m / Hz for all sources 5E-5 5E-5 2.2E-15 m / Hz for all sources 6.7E-17 m / Hz for all sources 2E-17 m / Hz for all sources TBD 6E-19 m / Hz for all sources TBD 5.5E-3 TBD TBD H transverse 2E-14 m / Hz for ~2E-15 m / Hz Seismic noise 3.3E-17 m / Hz >4 all sources for all sources Derived SUS 1.7E-4 5E-2 5E-2 isolation(4) Pitch 5E-18 rad / Hz ~1 2.9E-15 rad / Hz 8.6E-17 rad / Hz 4E-15 Yaw 5E-18 rad / Hz ~1 1.3E-15 rad / Hz 4E-17 rad / Hz 1.3E-15 See notes on next page 2E-14 m / Hz for all sources 6E-16 m / Hz for all sources 1.2E-16 4E-17 Notes Printed on 09/06/ at 3:58 PM Page 12 of 15

13 1. Current value for f crit is yyyy Hz 2. Not part of UK scope 3. Current value for f cutoff is xxx Hz 4. Values for SUS share of ETM/ITM isolation assume SEI delivers 2E-13 m / Hz and that seismic noise is half the total noise. at f crit. SUS share of isolation for BS assumes same SEI performance 5. This requirement is NOT fully met by the design in T Printed on 09/06/ at 3:58 PM Page 13 of 15

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15 evision history 12 October 2003 added requirements numbers, verification method, affected group Nov Minor updates following from Norna. Dec updates following US trip. emoved document list (now on separate web page) version 1. May26 updated in part following March LSC and the Grey areas exercise M Version 02. dded columns for action items etc. Printed on 09/06/ at 3:58 PM Page 15 of 15