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Figure 1.

OIWFS will be much more useful than it was before

New Aladdin-3 detector for GNIRS ready for testing at NOAO.

the accident, because it will be more sensitive and read out much more quickly. Improvements made to the GNIRS OIWFS may be applied to the NIRI and the Near-infrared Integral Field Spectrometer (NIFS) OIWFS systems in the future.

FLAMINGOS-2 The FLAMINGOS-2 infrared multi-object spectrograph (MOS), being built by the University of Florida, will soon be delivered to Cerro Pachón. At the time this has taken a long time, but is now complete. The

article was written, the FLAMINGOS-2 team and

optics have been reinstalled in their mounts and are

Gemini engineering and science staff had successfully

being aligned in preparation for integration into the

worked through about 90% of the pre-ship acceptance

GNIRS optical bench. Some optics that we originally

tests (Figure 2). A few lingering cryo-mechanical

thought were fine showed some coating damage

issues have been addressed, and we are now planning

after several months in Hilo. They have now been

to complete final pre-ship acceptance testing as this

cleaned, re-coated, or replaced. By the time this issue

Figure 2.

appears in print, we expect to have the instrument

Percy Gomez, instrument scientist, examines the MOS and decker wheels in FLAMINGOS-2 fore-dewar during acceptance testing last year in Gainesville, Florida.

fully integrated and ready for further alignment and testing. To prepare for GNIRS integration and testing, Gemini engineers have cleaned and repaired the cooling systems and dewar, tested for leaks, connected and tested the electronics, cables, motors, and computers, and assembled many mechanisms. They have also been working to get the array controllers ready. Procuring new detectors for GNIRS has taken much longer than expected. After months of delays and returning the detectors to Raytheon for rework, we have finally received two candidate science-grade Aladdin-3 InSb detectors (Figure 1). These two are being tested and characterized at NOAO, and the best one will be

issue goes to press. FLAMINGOS-2 is a key part of

shipped to Gemini for installation in GNIRS. Testing

our planned suite of instruments for Gemini, and we

in GNIRS is scheduled for the middle of this year,

look forward to commissioning it at Gemini South in

following warm tests with a multiplexer, and cold

the near future.

tests with an engineering grade device. The

68

infrared

On-instrument

Wavefront

GMOS Enhancements Sensor

(OIWFS) for GNIRS is being repaired at the

One way to make Gemini’s instrumentation more

University of Hawai‘i. It will be used in the future

competitive is to upgrade existing instruments. The

to improve GNIRS performance with the Altair AO

optical Gemini Multi-object Spectrograph at Gemini

system. The OIWFS optics have been modified and

North (GMOS-N) is now about 10 years old. The

a new filter added to make it much more sensitive.

detectors are no longer state of the art, so we have

A replacement engineering-grade HAWAII-1 HgCdTe

begun the process of replacing them with new, thick

detector has been acquired and testing is now under

CCD detectors that are much more sensitive at red

way with the detector controller. We expect that the

wavelengths and still retain at least as much blue

GeminiFocus

Issue 38 - June 2009  

GeminiFocus

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