PALM-3000 PALM-3000 Status 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

PALM-3000 Optical Bench DM3388 DM241 OAP1 TTM FM3 FM4 FM1 FM2 OAP2 SSM1 SSM2 HOWFS & ACam Science Instrument Volume Detailed design of all optomechanics is complete Currently verifying global flexure of bench with science instrument Remaining design tasks: –Stimulus fold mirror –Enclosure –Cable routing –Cable interface boxes

PALM-3000 High-Order Deformable Mirror Prior to face sheet bonding (Xinetics Inc.) Received at Caltech on Dec. 4, 2009 Spent Dec-Jan. testing performance with a Zygo interferometer In the lab at Caltech

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, % 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

PALM-3000 HODM Control Result 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 This is what we can expect to achieve when the LODM is correcting the low-spatial-frequency errors Surface

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 % RH 74deg Humidity Results Unpowered surface figure at different humidities shows the effect of humidity on the puckers Ideal humidity is between 13% and 30% 45% RH 74deg13% RH 70deg

PALM-3000 High Order Wavefront Sensor 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 See Baranec, Proc. SPIE 7015, Meets requirements (<0.05 binned pixels)

PALM-3000 HOWFS Detail Microlens arrays imaged with a CMOS alignment camera Shack-Hartmann spots imaged with the CCD-50

PALM-3000 Electronics Overview Wavefront Processor (computer room) DM Racks (Cass cage pos. 2 & 3) Controller Racks (Cass cage pos. 4 & 5) User Workstation (Data Room) Fiber Splitter AO Bench Ethernet Pvt net Legend: Fiber, high-speed switch, ethernet, AO bench cables

PALM-3000 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 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 parser95% –Includes communications interfaces Wavefront processor30% Device drivers (hardware interfaces)75% Telemetry system50% Automations25% Graphical user interface20% 14

PALM-3000 Servo Control Flexible servo control scheme. Detailed design of N=64 mode complete Detailed design of other modes still in progress

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 16

PALM-3000 PALM-3000 Testbed 17 HOWFS & ACAM HODM Zygo HASO CMOS WFP computer Includes HODM, HOWFS, WFP computer, and 3 calibration/diagnostic sensors Will allow us to verify all electronic & software interfaces.

PALM-3000 Lab I&T Schedule Testbed activities Dec-JanVerify performance of HODM Feb-MarVerify performance of HOWFS Mar-AprTest wavefront processor, software environment May-JunVerify high-speed wavefront control performance JulSPIE meeting, pre-ship review 18

PALM-3000 PALM-3000 Schedule Overview 19