Advances in instrumentation at the W. M. Keck Observatory

Adkins, Sean M.; Armandroff, T. E.; Lewis, Hilton; Martin, Chris; McLean, Ian S.; Rockosi, Constance M.; Wizinowich, Peter

doi:10.1117/12.857823

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…The Keck telescope has a low resolution imaging spectrograph with a polarimetric unit (LRISp). [63][64][65][66][67][68][69][69][70][71][72][73] The 10 meter diameter primary mirror combined with this Cassegrain-mounted spectropolarimeter leads to high sensitivity on faint targets such as galaxies, stars or comets. We outline some of the initial design choices for the LRISp retarders including considerations of crystal thickness.…”

Section: Appendix D Measured Fringes In a Six-crystal Retarder Using ...mentioning

confidence: 99%

Polarization modeling and predictions for DKIST part 3: focal ratio and thermal dependencies of spectral polarization fringes and optic retardance

Harrington

Sueoka

2018

J. Astron. Telesc. Instrum. Syst.

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Section: Appendix D Measured Fringes In a Six-crystal Retarder Using ...mentioning

confidence: 99%

Polarization modeling and predictions for DKIST part 3: focal ratio and thermal dependencies of spectral polarization fringes and optic retardance

Harrington

Sueoka

2018

J. Astron. Telesc. Instrum. Syst.

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“…MOSFIRE is a third generation instrument for the W. M. Keck Observatory (WMKO) 1 . Its requirements, design and development up until first light in the laboratory on July 1, 2010 were described in a previous paper 2 .…”

Section: Introductionmentioning

confidence: 99%

MOSFIRE, the multi-object spectrometer for infra-red exploration at the Keck Observatory

et al. 2012

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This paper describes the as-built performance of MOSFIRE, the multi-object spectrometer and imager for the Cassegrain focus of the 10-m Keck 1 telescope. MOSFIRE provides near-infrared (0.97 to 2.41 m) multi-object spectroscopy over a 6.1' x 6.1' field of view with a resolving power of R~3,500 for a 0.7" (0.508 mm) slit (2.9 pixels in the dispersion direction), or imaging over a field of view of ~6.9' diameter with ~0.18" per pixel sampling. A single diffraction grating can be set at two fixed angles, and order-sorting filters provide spectra that cover the K, H, J or Y bands by selecting 3 rd , 4 th , 5 th or 6 th order respectively. A folding flat following the field lens is equipped with piezo transducers to provide tip/tilt control for flexure compensation at the <0.1 pixel level. Instead of fabricated focal plane masks requiring frequent cryo-cycling of the instrument, MOSFIRE is equipped with a cryogenic Configurable Slit Unit (CSU) developed in collaboration with the Swiss Center for Electronics and Microtechnology (CSEM). Under remote control the CSU can form masks containing up to 46 slits with ~0.007-0.014 precision. Reconfiguration time is < 6 minutes. Slits are formed by moving opposable bars from both sides of the focal plane. An individual slit has a length of 7.0" but bar positions can be aligned to make longer slits in increments of 7.5. When masking bars are retracted from the field of view and the grating is changed to a mirror, MOSFIRE becomes a wide-field imager. The detector is a 2K x 2K H2-RG HgCdTe array from Teledyne Imaging Sensors with low dark current and low noise. Results from integration and commissioning are presented.

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“…Developed as part of the third generation instrument program at the W. M. Keck Observatory (WMKO) 1 , MOSFIRE is a near-infrared (0.97 to 2.45 μm) multi-object spectrograph and wide-field camera for the Cassegrain focus of Keck I. A special feature of MOSFIRE is that its multiplex advantage of up to 46 slits is achieved using a cryogenic Configurable Slit Unit (CSU) that is reconfigurable under remote control in less than 5 minutes without any thermal cycling of the instrument.…”

Section: Introductionmentioning

confidence: 99%

Design and development of MOSFIRE: the multi-object spectrometer for infrared exploration at the Keck Observatory

et al. 2010

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MOSFIRE is a unique multi-object spectrometer and imager for the Cassegrain focus of the 10 m Keck 1 telescope. A refractive optical design provides near-IR (0.97 to 2.45 μm) multi-object spectroscopy over a 6.14' x 6.14' field of view with a resolving power of R~3,270 for a 0.7" slit width (2.9 pixels in the dispersion direction), or imaging over a field of view of 6.8' diameter with 0.18" per pixel sampling. A single diffraction grating can be set at two fixed angles, and order-sorting filters provide spectra that cover the K, H, J or Y bands by selecting 3rd, 4 th , 5 th or 6 th order respectively. A folding flat following the field lens is equipped with piezo transducers to provide tip/tilt control for flexure compensation at the 0.1 pixel level. A special feature of MOSFIRE is that its multiplex advantage of up to 46 slits is achieved using a cryogenic Configurable Slit Unit or CSU developed in collaboration with the Swiss Centre for Electronics and Micro Technology (CSEM). The CSU is reconfigurable under remote control in less than 5 minutes without any thermal cycling of the instrument. Slits are formed by moving opposable bars from both sides of the focal plane. An individual slit has a length of 7.1" but bar positions can be aligned to make longer slits. When masking bars are removed to their full extent and the grating is changed to a mirror, MOSFIRE becomes a wide-field imager. Using a single, ASIC-driven, 2K x 2K H2-RG HgCdTe array from Teledyne Imaging Sensors with exceptionally low dark current and low noise, MOSFIRE will be extremely sensitive and ideal for a wide range of science applications. This paper describes the design and testing of the instrument prior to delivery later in 2010.

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Advances in instrumentation at the W. M. Keck Observatory

Cited by 5 publications

References 13 publications

Polarization modeling and predictions for DKIST part 3: focal ratio and thermal dependencies of spectral polarization fringes and optic retardance

Polarization modeling and predictions for DKIST part 3: focal ratio and thermal dependencies of spectral polarization fringes and optic retardance

MOSFIRE, the multi-object spectrometer for infra-red exploration at the Keck Observatory

Design and development of MOSFIRE: the multi-object spectrometer for infrared exploration at the Keck Observatory

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