AO Module Electronics

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MCAO

AO Module Electronics

Mark Hunten

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

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

May 24
-
25, 2001

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:


Source Simulators


Shutters


Main Tip/Tilt Mirror


Science Beamsplitter


Science ADC


NGS ADC


LGS WFS Zoom


LGS WFS positioning


NGS WFS


NGS WFS Positioning


Diagnostic WFS


MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

4

AOM Motor Listing

(slides courtesy of Corinne Boyer)

Device

Hardware

LGS simulated source
array illumination

One output channel of a XVME244
output card.

LGS simulated source
array position

A single DC motor with 2 limit
switches: 2 outputs and 2 inputs of a
XVME244 digital I/O card.

LGS simulated source
array focus

A single DC servo motor: one axis of
an OMS58 servo card.

NGS peripheral
simulated source array
illumination

One output channel of a XVME244
output card.

NGS central simulated
source array
illumination

One output channel of a XVME244
output card.

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

5

AOM Motor Listing, cont.

Device

Hardware

NGS simulated source
array position

A single DC motor with 2 limit
switches: 2 outputs and 2 inputs of a
XVME244 digital I/O card.

LGS reference source
array illumination

One output channel of a XVME244
output card.

LGS reference source
array position

A single DC motor with 2 limit
switches: 2 outputs and 2 inputs of a
XVME244 digital I/O card.

DM0 mask

A single DC motor with 2 limit
switches: 2 outputs and 2 inputs of a
XVME244 digital I/O card.

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

6

AOM Motor Listing, cont.

Device

Hardware

Inlet shutter

A single DC motor with 2 limit switches: 2
outputs and 2 inputs of a XVME244 digital
I/O card.

Output shutter

A single DC motor with 2 limit switches: 2
outputs and 2 inputs of a XVME244 digital
I/O card.

Beam splitter
wheel

A single DC motor with 2 limit switches: 2
outputs and 2 inputs of a XVME244 digital
I/O card.

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

7

AOM Motor Listing, cont.

Device

Hardware

Science ADC
position

A single DC motor with 2 limit switches: 2
outputs and 2 inputs of a XVME244 digital
I/O card.

Science ADC
rotation

2 DC servo motors: 2 channels of an
OMS58 servo card.

NGS ADC rotation

2 DC servo motors: 2 channels of an
OMS58 servo card.

DWFS probe arm

4 DC servo motors: 4 channels of an
OMS58 servo card.

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

8

AOM Motor Listing, cont.

Device

Hardware

Diagnostic camera
mirror

A single DC motor with 2 limit switches: 2
outputs and 2 inputs of a XVME244 digital
I/O card.

LGS zoom corrector

2 DC servo motors: 2 channels of an OMS58
servo card.

NGS WFS probe
arms

6 DC servo motors: 6 channels of an OMS58
servo card.

Pupil alignment
mirrors

Piezzo
-
electric actuators: 10 output channels
of a XYCOM 531 DAC.

LGS active relay
elements

15 DC servo motors: 15 channels of an
OMS58 servo card.

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

9

Adaptive Optics Module Electronics

AOM Motor Listing Summary

Type of control

Number of
Channels

Digital Output

22

Digital Input

38

DC Servo

31

Number of Pins
(includes encoders
and limit switches)

400

Number of Pins for
DM

~1200

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

10

AOM Component Controller

(slide courtesy of Corinne Boyer)

MVME 2700 366MHz, 64 MB CPU

Bancom 635 time board

OMS58 motor controller

OMS58 motor controller

OMS58 motor controller

XYCOM 244 Digital I/O

Control LAN

Time bus

To servo motor

electronics

To switches,

relays, DC

motors

To slow TT

mirrors

XYCOM531 D/A board

OMS58 motor controller

AOM VME

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

11

5 CCDs

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.

RTC

HVA

DMs

Servo Amp

T/T

3 x4 APDs

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

12

Adaptive Optics Module Electronics

Block diagram of NGS
APD WFS system
.

APD Modules
Gated Counters
3 NGS XY Stage
Main Tip/Tilt Mirror
VME Rack
NGS WFS Stages
Tip/Tilt
DC Servo Amp Modules
Fast
Mirror
DC Servo Amp Modules
Input of APD counts
Control
Control
Field Lenses
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

MCAO

May 24
-
25, 2001

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

May 24
-
25, 2001

MCAO Preliminary Design Review

14

Adaptive Optics Module Electronics

LGS CCD system


Proposed system uses SDSU second generation
controllers with the
new

high 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

May 24
-
25, 2001

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

May 24
-
25, 2001

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 I
q

of the high voltage amps.
Example:

-
Xinetics uses an amplifier that has 25 mA I
q
. 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

May 24
-
25, 2001

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

May 24
-
25, 2001

MCAO Preliminary Design Review

18

AOM Electronics Mass Estimate

Item
Qty
Mass ea in kg
Total mass in kg
APD Modules
12
0.25
3
APD Power supply +12V\+5V\-12V 15A@+5V
1
5
5
DC Servo Amp
26
0.35
9.1
Piezo Amp
10
0.35
3.5
DC Servo Amp P/S ?A@+24VDC/AC
2
2
4
Piezo Amp P/S 20A@24VDC
1
2
2
3U racks for amps
3
0.5
1.5
SDSU Power Supplies
3
2
6
SDSU Shoeboxes
3
6
18
DM Racks
5
25
125
VME Rack
1
10
10
Network Hub and annex
1
2
2
DM LVPS + racks
3
4
12
DM HVPS + racks
3
2
6
0
0
0
Total Mass:
207.1
MCAO

Design Proposal for

Gemini South Adaptive Optics


Paul

Clark

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

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

May 24
-
25, 2001

MCAO Preliminary Design Review

21

Drive System Architectural Overview

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

22

DAC Interface

DAC Card

HV Amplifier

HV PSU

Existing 97 actuator drive system

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

23

Existing 25 channel HV amplifier card

(one channel populated)

MCAO

May 24
-
25, 2001

MCAO Preliminary Design Review

24

PDR Agenda

Thursday, 5/24

0800 Welcome

0805 Project overview

0830 Science case

0930 Break

0945 System overview

1015

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

1545

Closed committee session

1800 Adjourn