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Alignment : Hardware & Software Status Henrich Heitmann, Julien Marque with the contribution of: INFN Frascati, Mario Favati, Dominique Le Galliot, Alain Masserot, Flavio Nocera, Tatania Zelenova. Contents. Hardware review Software review Last upgrades

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  1. Alignment : Hardware & Software Status Henrich Heitmann, Julien Marque with the contribution of: INFN Frascati, Mario Favati, Dominique Le Galliot, Alain Masserot, Flavio Nocera, Tatania Zelenova

  2. Contents • Hardware review • Software review • Last upgrades • a. Rearrangement of crate C34b. The 9th quadrant c. Global Control newsd. The offset issue

  3. 1a. The quadrant (Frascati) • Silicon photodiode, type EG&G YAG 444 • sensitivity = 0.45 A/W • DC power = 2.77 mWmax • transimpedance = 2 k  • Bias voltage = 180 V

  4. Demodulation board Phase shifter board 1b. Quadrant electronics (Frascati)

  5. 1c. The translation stages (Frascati) • 2 translation stages / quadrant(PI/M-125.90)1 translation stage control module : 4 translation stages control boards + quadrant power supply

  6. 1d. Flippers, Shutters (Frascati) • Shutter used to measure DC offsets.- shutter control card by Frascati.Mirrors (or neutral densities) mounted on flip-mount to attenuatethe light when diode used in 2 different configurations recombined/recycled (ratio of 1000 in DC power).- will install next week proper power supply.- need for their own electronics?

  7. 2a. The photodiode readout, translation stage control (LAPP/Napoli) • Phase tuning,Gain control…Quadrant motion control…

  8. 2b. The Global Control (LAL) • Compute correction signals to be sent to the DSP of each mirror to be applied to the reference mass

  9. 2c. The automation (LAPP/Napoli) • Alignment automation consits of: prealignment of the direct beam, prealignment of the north and west arm cavities, closing linear alignment loops on all mirror.

  10. 2d. The alignment UI (EGO) • Used for the commissioning of the linear alignment • (need to migrate to Labview?) • + automatic measurement and reconstruction of the optical matrix (Maddalena, Gabriele)

  11. 3a. Rearrangement of the electronics • Operation needed to:-separate analogic fron digital electronics-accommodate the electronics for the 9th quadrant • +Hardware monitoring completed+New electronics for DC remote control gain

  12. 3b. The 9th Quadrant • Everything installed but the cables (+ problem of communication between a 3rd translation stage driver and the rio to be fixed) • No more spare!!!!! Need for a 10th quadrant next year?

  13. 3c. Global Control news • New features for the alignment part of GC:-All matrices on the fly,-Integrated filters in GC (output and input),-Possibility to inject coherent lines on all mirrors for matrix measurement comodity, • Need to write some code still…

  14. 3d. The offset issue • Where the offsets of AC error signals are coming from? • a)DC offsets between different elements of the quadrant => beam not centered on diode => coupling with longitudinal signals => offset on alignment AC signals • This should have been fixed by a better DC tuning • b)Multireflection in the splitters of the optical setup => secondary beam combined with main beam => offset on alignment AC signal • Optics with 3 degrees wedge have been acquired: will be installed soon

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