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AO Module Electronics

AO Module Electronics Mark Hunten Adaptive Optics Module Electronics The Adaptive Optics Module (AOM) Electronics can be broken into 3 major subsystems: LGS CCD system Deformable Mirrors AOM control (everything else) Adaptive Optics Module Electronics AOM control

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AO Module Electronics

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  1. AO Module Electronics Mark Hunten

  2. Adaptive Optics Module Electronics The Adaptive Optics Module (AOM) Electronics can be broken into 3 major subsystems: • LGS CCD system • Deformable Mirrors • AOM control (everything else) MCAO Preliminary Design Review

  3. Adaptive Optics Module Electronics AOM control This covers the control system for most of the AOM. The system will control: • LGS WFS Zoom • LGS WFS positioning • NGS WFS • NGS WFS Positioning • Diagnostic WFS • Source Simulators • Shutters • Main Tip/Tilt Mirror • Science Beamsplitter • Science ADC • NGS ADC MCAO Preliminary Design Review

  4. AOM Motor Listing (slides courtesy of Corinne Boyer) MCAO Preliminary Design Review

  5. AOM Motor Listing, cont. MCAO Preliminary Design Review

  6. AOM Motor Listing, cont. MCAO Preliminary Design Review

  7. AOM Motor Listing, cont. MCAO Preliminary Design Review

  8. AOM Motor Listing, cont. MCAO Preliminary Design Review

  9. Adaptive Optics Module Electronics AOM Motor Listing Summary MCAO Preliminary Design Review

  10. AOM Component Controller(slide courtesy of Corinne Boyer) Time bus Control LAN MVME 2700 366MHz, 64 MB CPU OMS58 motor controller XYCOM531 D/A board XYCOM 244 Digital I/O OMS58 motor controller OMS58 motor controller OMS58 motor controller Bancom 635 time board AOM VME To servo motor electronics To switches, relays, DC motors To slow TT mirrors MCAO Preliminary Design Review

  11. Adaptive Optics Module Electronics RTC System Interface The High Voltage Amplifier (HVA) part of the system is controlled by RTC which reads the 5 CCDs, computes the corrections and then sends the corrections to the digital interface on HVA for the DMs. That interface takes the digital information and converts into analog which is then scaled to the high voltage needed to drive the DMs –> 40 to 100VDC. 5 CCDs RTC HVA DMs 3 x4 APDs Servo Amp T/T MCAO Preliminary Design Review

  12. Adaptive Optics Module Electronics Photons are gathered here and sent down the fibers. The APD modules register the photons and put out TTL pulses. We count the events with a gated counter so we can gather counts per unit time Then we read the counters with a digital input card to the VME computer. This is used to compensate for NGS tip tilt errors Block diagram of NGS APD WFS system. MCAO Preliminary Design Review

  13. Adaptive Optics Module Electronics LGS CCD system • Study was done by HIA on low noise rapid readout CCD systems. Conclusions are presented in Appendix O. • The system presented today has 5 80 x 80 CCDs read out at frame times of less than 1 ms. (2 CCDs not shown for clarity) MCAO Preliminary Design Review

  14. Adaptive Optics Module Electronics LGS CCD system • Proposed system uses SDSU second generation controllers with the newhigh speed fiber optic links to transfer data at 12.5MPix/s. • This system would require one interface card to reach the desired 7.5 Mpix/s rate for the 5 80x80 CCDs with <1ms readout rate. • SDSU is presently working on a PCI version of the high speed interface card, with the desired PMC version due out soon after. • The controller would have 10 dual video cards to read the 5 CCDs but using only one timing card to lockstep the readout. There would also be one utility card. MCAO Preliminary Design Review

  15. Adaptive Optics Module Electronics Deformable Mirror Electronics Two designs have been evaluated as possible approaches so far. Others are available. - Xinetics high voltage amplifiers. - University of Durham high voltage amplifiers. The approach from the University of Durham has lower power dissipation. MCAO Preliminary Design Review

  16. Adaptive Optics Module Electronics • AOM Power dissipation • The DMs have a drive system that is different than what we are used to. There is a quiescent power dissipation which depends on the Iq of the high voltage amps. Example: • Xinetics uses an amplifier that has 25 mA Iq. This, times the number of channels (1058) gives us just over 2kW of power while it is sitting there. This goes up when we move at higher frequencies. If we reduce this to 2.5 mA, the power goes down by a factor of 10. This is the main heat source for MCAO. • The rest of the electronics is estimated to dissipate 1kW. The worst case total would be over 3kW. MCAO Preliminary Design Review

  17. Adaptive Optics Module Electronics AOM Space Usage The volume of the DM system is 5 9U racks. Two each for the larger DMs and one for the smaller. Power supplies are in addition to this. The 2 VME racks take 9U each. A network interface takes 2U The rest of the system is made mostly of 3U racks. 1 - APD Interface rack 2 - Piezo servo racks 2 - DC Servo racks 1 - DC control rack - The total space available is 111U. - We are using 100U (1U = 1.75” – don’t ask) MCAO Preliminary Design Review

  18. AOM Electronics Mass Estimate MCAO Preliminary Design Review

  19. Design Proposal for Gemini South Adaptive Optics PaulClark

  20. System Overview • Compact, scalable design • Based on existing, proven equipment • Incorporates DAC interface, DAC and HV amplifier cards • Total volume 45U 19” rack space (excluding power supplies and ventilation) • Heat load 820W (approx) MCAO Preliminary Design Review

  21. Drive System Architectural Overview MCAO Preliminary Design Review

  22. Existing 97 actuator drive system DAC Interface DAC Card HV Amplifier HV PSU MCAO Preliminary Design Review

  23. Existing 25 channel HV amplifier card (one channel populated) MCAO Preliminary Design Review

  24. Thursday, 5/24 0800 Welcome 0805 Project overview 0830 Science case 0930 Break 0945 System overview System modeling 1100 AO Module optics 1145 Lunch 1245 AO Module mechanics 1340 AO Module electronics 1400 Break 1415 Beam Transfer Optics 1510 Laser Launch Telescope Closed committee session 1800 Adjourn PDR Agenda MCAO Preliminary Design Review

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