TMT AO & Possible Contribution of Japan Hideki Takami (Subaru - - PowerPoint PPT Presentation

TMT AO & Possible Contribution of Japan

Hideki Takami (Subaru Telescope)

Subsystems Mounted on Telescope

(TMT document)

Instruments, AO systems, APS Laser rooms 3x 50W laser M2 assembly: conventional (CM2)

• r adaptive (AM2)

Laser launch telescope (LLT) Laser BTO Mirrors or Optical fiber Red: Possible Japanese collaboration

TMT-Mapping AO Modes to Instrumentation Capabilities (TMT document)

High Contrast Diffraction- Limited Enhanced Seeing Seeing- Limited

FoV

2” 5-10” 0.5-2.0’ 5’ 10-15’

ExAO MOAO GLAO MCAO

IRIS

LTAO

IRMOS MIRES PFI WFOS (SRD) HROS (SRD)

$31.8M $30.6M First Light 0.01-0.02” Image Quality

First Light AO Architecture for TMT Supports Narrow-Field Instruments Using Existing/Near-Term Components/Concepts (TMT document)

Laser Guide Star Facility

• 3-6 sodium laser guidestars
• 3 50W, CW lasers

2011 FDR 2016 Commission

Conventional Secondary MCAO (NFIRAOS) LTAO

• 3 LGS WFS
• Current piezo

DM technology

• 6 LGS WFS
• 2 high-order

piezo DMs Narrow-field Near IR Instruments Mid IR Instruments

IRIS

An Adaptive Secondary Mirror Enables GLAO for Wider-Field Instruments and Improves Performance for Mid IR Instruments

(TMT document)

Adaptive Secondary Laser Guide Star Facility

• Compensation at moderate

spatial and temporal frequencies for low-order correction or woofer-tweeter control MCAO (NFIRAOS)

• Reduced

background and enhanced throughput Narrow-field Near IR Instruments Mid IR Instruments GLAO Wider-field Vis/Near IR Instruments

• 4 LGS WFS
• Enhanced

seeing

MEMs Deformable Mirrors Enable MOAO for Enhanced Imaging and Spectroscopy of Multiple Small Objects within a Larger Field

(TMT document)

Adaptive Secondary Laser Guide Star Facility MCAO (NFIRAOS) Narrow-field Near IR Instruments Mid IR Instruments GLAO Wider-field Vis/Near IR Instruments

• 8 sodium laser guidestars
• 3 50W, CW lasers

MOAO Multi-Object IFU Spectrometer

• 8 LGS

WFS

• MEMS

MEMS-DM

First light AO: IRIS will be mounted

• n the top port of NFIRAOS

(TMT document)

Other

IRIS

NIRES

NFIRAOS is a dual conjugate AO system => Wide Field (~2’)

Order 61x61 DM and TTS at h=0 km Order 75x75 DM at h=12 km – Better Strehl and larger field than current AO systems

NFIRAOS

Schematic of INSTRUMENT Activity

(TMT document)

2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 WFOS FDR TES T CO MM IRIS PDR FDR NFI RAO S CO MM INST 3 CoD R PDR FDR CO MM INST 4 CoD R FDR CO MM INST 5 CoD R PDR FDR CO MM INST 6 CoD R PDR FDR INST 7 CoD R PDR FDR INST 8 CoD R PDR FDR

Possible collaboration items with TMT about AO

Instruments, AO systems, APS Laser rooms 3x 50W laser M2 assembly: conventional (CM2)

• r adaptive (AM2)

Laser launch telescope (LLT) Laser BTO Mirrors or Optical fiber Red: Possible Japanese collaboration

Adaptive 2ry

Requirements of AM2 for TMT

• 1800 actuator, 400 modes,
• 3.1 m diameter, convex mirror
• 4-5 mm thickness glass (7 cm spacing)
• 20 Hz BW (AO closed loop BW -3dB),
• good for MIR AO or woofer, +/- 150 um (end to end, for windshake

and chopping)

AM2 is not fit in construction budget, upgrade 4-5 year after the first light. ~2020 => Japanese industry is expected as the manufacturer

First light AO collaboration in discussion with TMT

• 1. Laser & Fiber
• TMT now has a candidate vendor of Laser. As for Japan’s contribution, 10

W CW laser is OK, however required 25 W is new area for us. => Considering the TMT first light is 2016, It is worth to discuss with them.

• Fiber: Mitsubishi-cable (We will collaborate)

Our 35m fiber is almost meet the requirement of TMT

• 2. RTC for NFIRAOS (continue discussion)

GRAPE would be a candidate. TMT has a pre-conceptual design to use 3 DSP and 7 FPGA. Those chips have limitation in memory size. Requirement to the performance of Core part

• Input/output 120k pixel in 0.5 msec/WFS x 6WFSs
• gradient computation etc 35k grad for 6WFSs (it is smaller than others)
• 175M multiply & accumulation /frame in ~1ms => FFT & spars matrix op.
• 7400 actuators drive, 2DMs 61x61, 73x73

2008-2009 conceptual design study. 2013 mid delivery of RTC

Summary

1. TMT covers wide range of AO in their plan 2. TMT will build only one LGSAO system for their First light. 3. Japan has possible collaboration technologies to contribute their FL AO (The contribution would be

subsystem or component level, good for starting?)

4. Other several Instruments/AO require additional budget which will be commissioned in 2018- 2022

(We have a chance to make significant contributions and should have ideas what we want to do)