Advanced Virgo Squeezing Working Group Overview

The Advanced Virgo (AdV) project involves various activities related to squeezing technology, optical layouts, Faraday isolators, and electronics. The project includes components like the squeezer, clean room, detectors, telescopes, and alignment systems. The installation, commissioning, and status planning are detailed in the INFN Referee reports from Cascina, dated July 23, 2018. The project also aims to achieve specific results like matching telescope alignments and Faraday isolator performance. Various equipment and control systems are utilized to ensure the project's success.

• Advanced Virgo
• Squeezing Technology
• Optical Layouts
• Faraday Isolators
• Electronics

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1. AdV squeezing AdV squeezing Jean-Pierre Zendri On behalf of the squeezing working group INFN Referee Cascina July 23, 2018 1

2. Layout Frequency Independent Squeezing (O3) Installation Commissioning Frequency Dependent Squeezing (O4) Status and planning INFN Referee Cascina July 23, 2018 2

3. AdV-FIS External bench hosting the squeezer Clean room 1000 DetLab 3D-view SDB2 Electronics Injection bench SDB1 AEI Squeez. Acoustic enclosure Squeezed INFN Referee Cascina July 23, 2018 3

4. FIS: Optical layout INFN Camera 2 INFN External PLL INFN Matching telescope INFN Camera 1 INFN Microphone Accelerometers Seismometers Thermometers Squeezerr INFN (auto-) alignment Internal PLL INFN INFN Referee Cascina July 23, 2018 4

5. The AEI squeezer in AdV Friday 12 January Sunday 14 January The Hannover results reproduced in Cascina Example: with air blowers ON and moderate green power 10.5 dB 8 dB (9.0 dBprod.) INFN Referee Cascina July 23, 2018 5

6. FIS: telescope and alignment mode matching of more than <50% has never been achieved Motorized steering Squeezer box Fast shutter Camera1 Camera2 INFN Referee Cascina July 23, 2018 6

7. Faraday isolators In vacuum Faraday Vacuum faraday before assembling on SDB1 In vacuum bench test (VIR-0084A-18) Throughput: (99 0.2)% Isolation > 40 dB Installed on SDB1 (entry#40626) Only the motorized shutter the half wave plate and the Peltier element have been connected G. Pillant, E. Genin, C. De Rossi Double stage in air faraday on the squeezer In air Faraday Bench test before assembly (DCC-G1800468-v1) Throughput: (99.4 0.2)% Installed on the squeezer bench (entry#41211) INFN Referee Cascina July 23, 2018 7

8. FIS: Electronics RACK-5 The analog squeezer control system provided by AEI. DAQ based monitor and triggering system and additional digital loops RACK-4 INFN 2 PLL boards (internal and external PLL). 8 DDS (rf) channels locked to the main Virgo time distribution All the motors and translation stage drivers. Squeezer Controls: Rack5 INFN Referee Cascina July 23, 2018 8

9. FIS: Infrastructures Plexiglas box Entry#40854 Entry#40854 Acoustic enclosure Plexiglas connection pipe INFN Referee Cascina July 23, 2018 9

10. Big Flange and Viewport Dust contamination issue SDB1 Viewport Entry#40683 Squeezer bench Entry#40681 The viewport has been substituted during the last det tower venting INFN Referee Cascina July 23, 2018 10

11. FIS: BAB versus OMC matching Although some attempts have already been made, a mode matching of more than <50% has never been achieved (entry #41542,41521,40668). The measured diameter of the beam comming from the ITF is 30% lower than the expected one (entry #41689,41746) This required to change the geometry of the telescope in reflection. Entry#41131 Next week expected two shifts with ITF INFN Referee Cascina July 23, 2018 11

12. FIS: PLLs Internal PLL between the squeezer main and CC lasers Ext PLL on Res. phase noise 7 mrad Ext PLL off 80 MHz Extetrnal PLL between the squeezer and AdV main lasers Res. phase noise 15-30 mrad 7 MHz INFN Referee Cascina July 23, 2018 12

13. Fiber phase noise The phase noise induced by termo-acoustic pick-up of the PM fiber has been measured PLL- residual phase noise (<15 mrad) Fiber phase noise (180 mrad) INFN Referee Cascina July 23, 2018 13

14. First Injection test (May 2018) No squeezed light effect (ITF not shot noise limited) First test of the Coherent Control Loop CC beam 7MHz offset co propagating with the squeezed beam SDB1 Measured time delay 1 ms INFN Unitary gain bandwidth 140 Hz (required at least 1 kHz) mainly limited by the ms time delay induced by digital demodulation plus DAC Residual phase noise order of 60 mrad (target 30 mrad) INFN Referee Cascina July 23, 2018 14

15. Achievement of the project targets Optical Losses Early August ? Squeezing ellipse jitter Target: 30 mrad Achieved: 70 mrad (mainly for DAC time latency) INFN Referee Cascina July 23, 2018 15 15

16. FI: short term activities Prerequirements: ITF stable and shot noise limited Early August (2-3) Mode matching and alignment with ITF (INFN) Hierarchical autolocking of the PLLs using Metatron (EGO & INFN) End of August (21-24) Squeezed light injection in the dark port Test of the CC Test of the autoalignment system. INFN Referee Cascina July 23, 2018 16

17. FIS Target sensitivity The injected squeezing degree must be kept below 4-5 dB The expected HF gain is thus 3-4 dB INFN Referee Cascina July 23, 2018 17 17

18. Frequency Dependent Squeezing FDS AdV SR 120 Mpc AdV+ (Phase I) SR+FDS 150 Mpc SR+FDS+NN 160 Mpc INFN Referee Cascina July 23, 2018 18 18

19. AdV+ Phase I Frequency dependent Squeezing with Filter Cavity INFN Referee Cascina July 23, 2018 19 19

20. Preliminary time schedule Conceptual design: basic design and the list of requests to be met https://svn.ego-gw.it/svn/AdvVirgo/AdV_Squeezing/ INFN Referee Cascina July 23, 2018 20

21. FDS next steps STEP1: Deadline July 30 30 Items and interest of groups that are listed in this document have been communicated in the past. Please identify missing items. Indicate participation of your group to certain items Specify the resources (financial, person power, in-kind) that you can contribute Specify the resources that you request from EGO Council to deliver your contribution STEP2 : Early August Meeting of group leaders scheduled for early August. Then roles and responsibilities will be discussed STEP3 : September 23 The high level WBS will be presented to the Council INFN Referee Cascina July 23, 2018 21

22. FDS preliminary requirements Target: 7-8 dB of HF improvement without degrading low frequency for both AdV and AdV+ A significant reduction of losses is required Optical losses Needs of a strategy to reduce mode mismatch an misalignment . This R&D activity have to be included on the project! INFN Referee Cascina July 23, 2018 22

23. Filter cavity lenght Noise budget Noise budget contributions Filter cavity losses : decrease with FC lenght. Relevant parameter: round trip losses assumed 20 ppm Mode mismatch contribution: length independent. Assumed 1% Residual cavity displacement noise: scales as the inverse of the cavity lenght FC design (VIR-0312A-18) The best compromise for the AdV FC length is about 300-500 meters Strain sensitivity INFN Referee Cascina July 23, 2018 23

24. sensitivity to the FC parameters Excess of losses in the cavity NS-NS BH-BH Mode mismatch BH-BH NS-NS INFN Referee Cascina July 23, 2018 24

25. In air or in vacuum squeezer? Dettails on VIR-0875B-17 S1FI and S1F2 are mandatory SSB1 traking of SDB1 required With a linear OPO the IFI is always required regardless if the OPO is suspended or not The decision is postponed until we will test the model and estimate the value of some parameters with measures on the FIS 25 INFN Referee Cascina July 23, 2018

26. Preliminary FDS layout Injection Optics Input mirror Squeezer M.Tacca et all. VIR-0703A-17 Squeezer in air Squeezer in vacuum On SDB1 Minitower Simpler Susp. Alignment bench INFN Referee Cascina July 23, 2018 26

27. Infrastructure modifications Preliminary design (sligthly changed respect the original design) moderate civil works needed (TBD by Civil_team) 1) Hole opening (sandwich wall 5 cm thick), and 2) displacement of HVAC channel H = 2.9m 2) passage opening (in not critical concrete walls) 3) Storage-room area upgrading 4 4) Shift the tube crossing stairs 2 Cryotrap/valve dismount area 3 Crane area (benches , minitowers...) 1 INFN Referee Cascina July 23, 2018 27

28. FDS: FC infrastructures The tunnel roof has to be raised Infrastructure meeting July 10 2018 The FC Y position has been fixed so the FC lenght is defined Two possible scenarios for X position Planimetry End Mirror 300 INFN Referee Cascina July 23, 2018 28

29. FDS: FC suspensions Kick-Off meeting on May 7th, design started on May 10th Production drawings are in progress (VIR-0401A-18). 2300 mm INFN Referee Cascina July 23, 2018 29

30. FDS: Cavity controls (IR) IR locking scheme (VIR-0398A-18) Cavity Finesse 8000 Frequency offset: n*FSR+Detuning ~ GHz Need of GHz PLL Alternative scheme: Use the CC sidebands for the FC alignment and locking (VIR-0329A-18) Virgo Week July July 11 , 2018 30

31. FDS: Cavity controls (green) Locking with auxiliary green beam (VIR-0399A-18, VIR-0329A-18 , VIR- 0400A-18 ) Integrated scheme Ctrl microtower Inj minitower In air squeezer INFN Referee Cascina July 23, 2018 31

32. FDS: INFN R&D and activities Richieste divise FDS: attivit specifiche per FDS FDS&EPR: attivit che hanno applicazioni in entrambe le due linee di ricerca INFN Section Genova Napoli Padova Roma II TIFPA Main activity Optical design, Beam pointing and in vacuum optics Optical design, In vacuum optics MM telescopes PLLs, Mode matching sensing with PD and actuation Abberation and higher order modes control Mode matching sensing with QPD and actuation RomaI Perugia Payload,.. Constr. Next year Magnets, hears, wires INFN Referee Cascina July 23, 2018 32

33. Sensing Mode Mismatch Using Existing WFS Benefit of mode converter with quadrant photodiodes Ability to measure mode mismatch using existing QPD WFS Mode converter preserves cavity misalignment signals. No new electronics or channels are needed. QPDs are easier to align than BPDs. Compared to BPDs, QPDs are off-the-shelf and have a much better matched quadrant capacities on optical gains. Only one mode converter, followed by normal Gouy phase telescopes for each sensor is needed to sense all four alignment and two mode-match degrees of freedom The only optical component critically sensitive to beam size is the mode converter itself. It is much easier to change than the segment size of (multiple) BPDs Laser EOM Thermal Lens Actuators Optical Cavity BPDs Gouy Phase Telescopes OR PDH Lock Alignment and Mode Matching Focusing Lenses Mode Converter QPDs Gouy Phase Telescopes Demodulation and Feedback Electronics Credit to Fabian Maga a-Sandoval INFN Referee Cascina July 23, 2018 33

34. Sensing Mode Mismatch Using Existing PD Primo prototipo di lente elettro-ottica realizzato. La costruzione del set-up sperimentale per il primo test in fase conclusiva INFN Referee Cascina July 23, 2018 34