PALM-3000 Status
PALM-3000
A.H. Bouchez, J.E. Roberts
Project 1640 Las Vegas Summit
1/28/2010
PALM-3000
PALM-3000 status
The big picture: We are integrating the new PALM-3000
components in the lab, while a few remaining
subsystems are in detailed design. We are on track for
a pre-ship review in early July.
Talk Outline:
• Status by subsystem
– 3388-actuator DM testing results
• Integration and testing in 2010
• Commissioning plans in 2011
2
Optical Bench
PALM-3000
DM3388
OAP1
TTM
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Detailed design of
all optomechanics is
complete
Currently verifying
global flexure of
bench with science
instrumentScience
Instrument
RemainingVolume
design
tasks:
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–
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Stimulus fold mirror
Enclosure
Cable routing
Cable interface
boxes
OAP2
DM241
FM1
FM3
SSM2
FM2
SSM1
FM4
HOWFS & ACam
PALM-3000
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High-Order Deformable Mirror
Received at Caltech on
Dec. 4, 2009
Spent Dec-Jan. testing
performance with a Zygo
interferometer
In the lab at Caltech
Prior to face sheet bonding (Xinetics Inc.)
PALM-3000
HODM testing
• Tested with a Zygo in I&T testbed
– Plastic curtains enclose bench to
allow humidity control with dessicant
• Data
– Unpowered and bias voltage
measurements at 40-50% RH, 1015% RH and 20-30% RH
– Actuator influence functions
– Actuator Linearity
– Actuator Hysteresis
– Actuator Creep
• Reconstructor made from the
influence functions was used to
flatten the mirror
– Other control tests include controlling
to the low spatial frequency error
instead of flat and maximizing the
focus error to test the full mirror
stroke
HODM Control Result
PALM-3000
Surface
Surface
• Mirror in normal mode (40V bias) Temp: 75F RH: 26%
• Zernikes 1-30 were removed from the bias measurement and the
residual wavefront was flattened using the HODM actuators. The
result is on the left.
• On the right is the same measurement less Zernikes 1-30. This is
what we can expect to achieve when the LODM is correcting the
low-spatial-frequency errors
PALM-3000
HODM lessons
• The HODM can be flattened to 10nm RMS
– Simulations show that resulting wavefront will not limit contrast
performance
• The total stroke of the mirror is 1.06μm.
– A few actuators along the bottom of the mirror have significantly
lower stroke
• With the LODM, the HODM will use 30% of its stroke to
correct its own figure
• We need to control the humidity around the HODM
– Best figure between 20% and 30% RH
• 40V bias rather than the nominal 50V bias gives more
stroke and a better base figure at the expense of more
non-linearity in the actuator gains
PALM-3000
45% RH 74deg
Humidity Results
30% RH 74deg
13% RH 70deg
• Unpowered surface figure at different humidities
shows the effect of humidity on the puckers
• Ideal humidity is between 13% and 30%
PALM-3000
•
Complete and ready for
installation in lab testbed
•
Flexure testing ongoing.
Initial results meet
requirements (<0.2”/hr)
•
Two optics need to be
replaced: Will replace
and realign later in spring
•
Acquisition camera (not
shown) needs to be
aligned and tested
High Order Wavefront Sensor
Pupil
RMS slope
RMS wavefront
sampling
(pixels)
(nm; Zernike 1-20)
63
0.038
102
32
0.066
166
16
0.150
143
8
0.175
150
Meets requirements (<0.05 binned pixels)
See Baranec, Proc. SPIE 7015, 2008.
PALM-3000
Microlens arrays imaged with a
CMOS alignment camera
HOWFS Detail
Shack-Hartmann spots imaged with
the CCD-50
Electronics Overview
PALM-3000
Legend: Fiber, high-speed switch, ethernet, AO bench cables
Ethernet
Pvt net
Fiber
Splitter
User Workstation
(Data Room)
AO Bench
Wavefront Processor
(computer room)
DM Racks
(Cass cage pos. 2 & 3)
Controller Racks
(Cass cage pos. 4 & 5)
PALM-3000
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DM Electronics and Cabling
Lab configuration complete and in use (serial com. to DM drivers, 99 cables, air cooled)
Current design efforts:
- High-speed DM command electronics design in progress
- Operational DM cable design in progress (16 cables for HODM, 1 for LODM)
- Driver electronics dissipate ~6 kW. Liquid cooling design still required
PALM-3000
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Wavefront Processor Computer
Wavefront Processor Computer clusters
completed and deployed (JPL and
Caltech)
Significant challenge has been
hardware/software compatibility.
Manufacturer of high-speed switch went
out of business.
Have demonstrated full vector matrix
multiplication using 64x64
subapertures at 1.24 kHz with current
GPUs
If necessary, will upgrade to latest GPUs
after pre-ship review to meet 2 kHz
requirement
PALM-3000
Software
Deep into coding & verifying interfaces. Expect to begin
using software environment in the lab in Feb.
Major components
Complete
 Publish/subscribe infrastructure
100%
• Command parser
–
•
•
•
•
%
95%
Includes communications interfaces
Wavefront processor
Device drivers (hardware interfaces)
Telemetry system
Automations
30%
75%
50%
25%
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PALM-3000
• Flexible servo control
scheme.
• Detailed design of
N=64 mode complete
• Detailed design of
other modes still in
progress
Servo Control
PALM-3000
Palomar Infrastructure
Currently defining requirements.
Major components:
• Power at Cassegrain focus (& AO lab)
• Coolant at Cassegrain focus (& AO lab)
• Telescope balance adjustments
 Power in computer room
 Communications between Cass, Computer
Room, AO lab, and Data Room
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PALM-3000
PALM-3000 Testbed
• Includes HODM, HOWFS, WFP computer, and 3
calibration/diagnostic sensors
• Will allow us to verify all electronic & software interfaces.
HODM
WFP
computer
CMOS
Zygo
HOWFS
& ACAM
HASO
17
PALM-3000
Lab I&T Schedule
Testbed activities
Dec-Jan Verify performance of HODM
Feb-Mar Verify performance of HOWFS
Mar-Apr
Test wavefront processor, software
environment
May-Jun Verify high-speed wavefront control
performance
Jul
SPIE meeting, pre-ship review
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PALM-3000
PALM-3000 Schedule Overview
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