PHARO (2?) James Lloyd (Cornell). PHARO is the Palomar Workhorse AO Instrument Commissioned in early 1998 Built at Cornell: Tom Hayward/Bernhard Brandl.

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Presentation transcript:

PHARO (2?) James Lloyd (Cornell)

PHARO is the Palomar Workhorse AO Instrument Commissioned in early 1998 Built at Cornell: Tom Hayward/Bernhard Brandl JHK Imaging + spectroscopy + coronagraphy Very good optics All reflective: 2 plate scales 25 mas 1.2 mm) 40 mas 1.9 mm) 35 nm RMS WFE (Hayward et al 2001)

Problems with PHARO Detector Early generation HAWAII-1 (1k) Very peculiar reset anomaly Limited dynamic range Reliability of acquisition system based on SPARC-2/SunOS platform Mechanism Reliability due to cryogenic Phytron Motors

Aperture Masking

Closure Phase/SelfCal

Contrast vs l

L Band Keck

L Band Palomar

Upgrade PHARO? Teledyne (Rockwell) has been advertising the “H4-RG-10” as the next generation: 4k x 4k detector with 10 micron pixels a 10 micron pixel would give PHARO Nyquist sampling at l=660 nm. Current generation of HgCdTe detectors from Teledyne are available substrate removed with QE>70% to l=400 nm

Upgrade PHARO? This would be neat: push out l to cover the visible for P3K and the L/M bands for a masking planet survey Solve the detector problems with PHARO Solve at the same time PHARO mechanical problems and implement additional desirable capabilities. (nb there is a wrinkle that additional cooling requires a new dewar) Cornell is considering an NSF/MRI proposal to fund this upgrade

Options micron pixel detector Teledyne has fabricated Si-pin H4RG-10, but there are problems with the unit cell A H4RG-10/H2RG-10 is probably $0.8M-$1.0M development today. 2. H2RG-18 with mm substrate removed detector: about $400k + a whole new instrument (at least another $1M) 3. H1RG-18 with mm substrate removal. May be able to add the optics for a finer plate scale, but likely will be stuck with 25mas pixels.

Questions/Comments ? Will there be a role for PHARO without an upgrade? Are there other important considerations or suggestions for a PHARO upgrade?