Post on 22-Dec-2015
transcript
May 24-25, 2001 MCAO Preliminary Design Review
2
MCAOMCAOAdaptive Optics Module Adaptive Optics Module ElectronicsElectronics
The Adaptive Optics Module (AOM) Electronics can be broken into 3 major subsystems:
•LGS CCD system•Deformable Mirrors•AOM control (everything else)
May 24-25, 2001 MCAO Preliminary Design Review
3
MCAOMCAOAdaptive Optics Module Adaptive Optics Module ElectronicsElectronics
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
May 24-25, 2001 MCAO Preliminary Design Review
4
MCAOMCAOAOM Motor Listing AOM Motor Listing
(slides courtesy of Corinne Boyer)(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.
May 24-25, 2001 MCAO Preliminary Design Review
5
MCAOMCAO
AOM Motor Listing, cont.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.
May 24-25, 2001 MCAO Preliminary Design Review
6
MCAOMCAO
AOM Motor Listing, cont.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.
May 24-25, 2001 MCAO Preliminary Design Review
7
MCAOMCAO
AOM Motor Listing, cont.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.
May 24-25, 2001 MCAO Preliminary Design Review
8
MCAOMCAO
AOM Motor Listing, cont.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.
May 24-25, 2001 MCAO Preliminary Design Review
9
MCAOMCAOAdaptive Optics Module Adaptive Optics Module ElectronicsElectronics
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
May 24-25, 2001 MCAO Preliminary Design Review
10
MCAOMCAOAOM Component ControllerAOM Component Controller(slide courtesy of Corinne Boyer)(slide courtesy of Corinne Boyer)
MV
ME
270
0 36
6MH
z, 6
4 M
B C
PU
Ban
com
635
tim
e b
oard
OM
S58
mot
or c
ontr
olle
r
OM
S58
mot
or c
ontr
olle
r
OM
S58
mot
or c
ontr
olle
r
XY
CO
M 2
44 D
igit
al I
/O
Control LAN
Time bus
To servo motor electronics
To switches, relays, DC motors
To slow TT mirrors
XY
CO
M53
1 D
/A b
oard
OM
S58
mot
or c
ontr
olle
rAOM VME
May 24-25, 2001 MCAO Preliminary Design Review
11
MCAOMCAO
5 CCDs
Adaptive Optics Module Adaptive Optics Module ElectronicsElectronics
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.
RTCHVA DMs
Servo Amp T/T3 x4 APDs
May 24-25, 2001 MCAO Preliminary Design Review
12
MCAOMCAOAdaptive Optics Module Adaptive Optics Module ElectronicsElectronics
Block diagram of NGS APD WFS system.
Photons are gathered here and sent down the fibers.
The APD modules register the photonsand 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
May 24-25, 2001 MCAO Preliminary Design Review
13
MCAOMCAOAdaptive Optics Module Adaptive Optics Module ElectronicsElectronics
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)
May 24-25, 2001 MCAO Preliminary Design Review
14
MCAOMCAOAdaptive Optics Module Adaptive Optics Module ElectronicsElectronics
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.
May 24-25, 2001 MCAO Preliminary Design Review
15
MCAOMCAOAdaptive Optics Module Adaptive Optics Module ElectronicsElectronics
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.
May 24-25, 2001 MCAO Preliminary Design Review
16
MCAOMCAOAdaptive Optics Module Adaptive Optics Module ElectronicsElectronics
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.
May 24-25, 2001 MCAO Preliminary Design Review
17
MCAOMCAOAdaptive Optics Module Adaptive Optics Module ElectronicsElectronics
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)
May 24-25, 2001 MCAO Preliminary Design Review
18
MCAOMCAO
AOM Electronics Mass EstimateAOM Electronics Mass EstimateItem Qty Mass ea in kg Total mass in kg
APD Modules 12 0.25 3APD Power supply +12V\+5V\-12V 15A@+5V 1 5 5DC Servo Amp 26 0.35 9.1Piezo Amp 10 0.35 3.5DC Servo Amp P/S ?A@+24VDC/AC 2 2 4Piezo Amp P/S 20A@24VDC 1 2 23U racks for amps 3 0.5 1.5SDSU Power Supplies 3 2 6SDSU Shoeboxes 3 6 18DM Racks 5 25 125VME Rack 1 10 10Network Hub and annex 1 2 2DM LVPS + racks 3 4 12DM HVPS + racks 3 2 6
000
Total Mass: 207.1
MCAOMCAO
Design Proposal for Design Proposal for Gemini South Adaptive OpticsGemini South Adaptive Optics
PaulPaul ClarkClark
May 24-25, 2001 MCAO Preliminary Design Review
20
MCAOMCAO
System OverviewSystem 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)
May 24-25, 2001 MCAO Preliminary Design Review
21
MCAOMCAO
Drive System Architectural Drive System Architectural OverviewOverview
May 24-25, 2001 MCAO Preliminary Design Review
22
MCAOMCAO
DAC Interface
DAC Card
HV AmplifierHV PSU
Existing 97 actuator drive Existing 97 actuator drive systemsystem
May 24-25, 2001 MCAO Preliminary Design Review
23
MCAOMCAO
Existing 25 channel HV amplifier Existing 25 channel HV amplifier cardcard
(one channel populated)(one channel populated)
May 24-25, 2001 MCAO Preliminary Design Review
24
MCAOMCAO
PDR AgendaPDR Agenda
Thursday, 5/240800 Welcome 0805 Project overview 0830 Science case0930 Break0945 System overview1015 System modeling1100 AO Module optics1145 Lunch
1245 AO Module mechanics1340 AO Module electronics1400 Break1415 Beam Transfer Optics1510 Laser Launch
Telescope1545 Closed committee
session1800 Adjourn