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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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adaptive optics module electronics
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

adaptive optics module electronics3
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

aom motor listing cont
AOM Motor Listing, cont.

MCAO Preliminary Design Review

aom motor listing cont6
AOM Motor Listing, cont.

MCAO Preliminary Design Review

aom motor listing cont7
AOM Motor Listing, cont.

MCAO Preliminary Design Review

aom motor listing cont8
AOM Motor Listing, cont.

MCAO Preliminary Design Review

adaptive optics module electronics9
Adaptive Optics Module Electronics

AOM Motor Listing Summary

MCAO Preliminary Design Review

aom component controller slide courtesy of corinne boyer
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

adaptive optics module electronics11
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

adaptive optics module electronics12
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

adaptive optics module electronics13
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

adaptive optics module electronics14
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

adaptive optics module electronics15
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

adaptive optics module electronics16
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

adaptive optics module electronics17
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

aom electronics mass estimate
AOM Electronics Mass Estimate

MCAO Preliminary Design Review

system overview
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

slide21

Drive System Architectural Overview

MCAO Preliminary Design Review

slide22

Existing 97 actuator drive system

DAC Interface

DAC Card

HV Amplifier

HV PSU

MCAO Preliminary Design Review

slide23

Existing 25 channel HV amplifier card

(one channel populated)

MCAO Preliminary Design Review

pdr agenda
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