Mechanical design of SIFS SOAR integral field unit spectrograph

Macanhan, Vanessa Bawden de Paula; Santoro, Fernando; Gneiding, Clemens D.; Oliveira, Antônio César de; Lourenco, Fernando; Barbuy, B.; Lépine, J. R. D.; Figueiredo, Militão V.; Silva, Paulo F.; Castilho, B. V.; Ribeiro, Flávio F.; Arruda, Marcio Vital de; Gutierrez, Arturo M.; Zambretti, Luiz R.; Rodrigues, Francisco; Luz, Henrique Di Pintor Da; Silva, José M. Da

doi:10.1117/12.856593

Cited by 2 publications

(4 citation statements)

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“…The SOAR Telescope is a 4.1-m Ritchey-Chretien alt-azimuth telescope that provides high-precision pointing with a large instrument payload capacity and excellent angular resolution with tip-tilt correction [1,13]. SIFS is a fiber-fed integral field spectrograph consisting of 1300 fibers covering a 15 × 7.8 arsec 2 field-of view with an angular resolution of 0.30 arsec/fiber.…”

Section: System Characteristicsmentioning

confidence: 99%

“…SIFS has wide wavelength coverage, from 350 nm to 1000 nm, while allowing for simultaneous spectra to be taken of all parts of moderately extended objects such as H ii regions. Furthermore, SIFS uses volume phase holographic (VPH) transmission gratings that offer a range of spectral resolution (R = δλ/λ) from 5000 < R < 30000, which is sufficient to measure stellar metallicities at R > 6000 and abundance ratios, such as Hα/Fe, at R > 15000 [1,3,13]. For example, Palumbo et al (2020) used SIFS to measure redshifts, velocity fields, which were constructed by sampling object spectra at many discrete points, specific start formation rates, and surface mass densities of compact dwarf starburst galaxies in the Local Volume [14].…”

Section: System Characteristicsmentioning

confidence: 99%

“…SIFS employs a lenslet, fiber IFU system which consists of 1300 lenslets and optical fibers arranged into a 50 × 26 array and encapsulated in 26 furcation tubes. The optical fibers (Polymicro "blue" fiber) have a spectral transmission > 70% for wavelengths between 350 nm and 950 nm [1,13]. The bench spectrograph (Fig.…”

Section: System Characteristicsmentioning

confidence: 99%

“…1) is installed on the platform of the SOAR telescope, supported by six sets of pneumatic supports for vibration isolation. The bench spectrograph includes the output unit support, the collimator lens group and a spherical mirror, the VPH gratings exchanging mechanism, the camera and detector [13]. The SIFS Skipper CCD focal plane will house four Skipper CCDs and be mounted in a replacement cryostat that matches the mechanical dimensions and focal distance of the original (item 6 in Fig.…”

Section: System Characteristicsmentioning

confidence: 99%

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Design of a Skipper CCD focal plane for the SOAR integral field spectrograph

Villalpando

Drlica-Wagner

Bonati³

et al. 2022

X-Ray, Optical, and Infrared Detectors for Astronomy X

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We present the development of a Skipper Charge-Coupled Device (CCD) focal plane prototype for the SOAR Telescope Integral Field Spectrograph (SIFS). This mosaic focal plane consists of four 6k × 1k, 15 µm pixel Skipper CCDs mounted inside a vacuum dewar. We describe the process of packaging the CCDs so that they can be easily tested, transported, and installed in a mosaic focal plane. We characterize the performance of ∼ 650µm thick, fully-depleted engineering-grade Skipper CCDs in preparation for performing similar characterization tests on science-grade Skipper CCDs which will be thinned to 250µm and backside processed with an antireflective coating. We achieve a single-sample readout noise of 4.5 e − rms/pix for the best performing amplifiers and subelectron resolution (photon counting capabilities) with readout noise σ ∼ 0.16 e − rms/pix from 800 measurements of the charge in each pixel. We describe the design and construction of the Skipper CCD focal plane and provide details about the synchronized readout electronics system that will be implemented to simultaneously read 16 amplifiers from the four Skipper CCDs (4-amplifiers per detector). Finally, we outline future plans for laboratory testing, installation, commissioning, and science verification of our Skipper CCD focal plane.

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Section: System Characteristicsmentioning

confidence: 99%

Section: System Characteristicsmentioning

confidence: 99%

Section: System Characteristicsmentioning

confidence: 99%

Section: System Characteristicsmentioning

confidence: 99%

See 2 more Smart Citations

Design of a Skipper CCD focal plane for the SOAR integral field spectrograph

Villalpando

Drlica-Wagner

Bonati³

et al. 2022

X-Ray, Optical, and Infrared Detectors for Astronomy X

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Characterization and Optimization of Skipper CCDs for the SOAR Integral Field Spectrograph

Villalpando,

Drlica-Wagner,

Plazas Malagón

et al. 2024

PASP

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We present results from the characterization and optimization of Skipper charge-coupled devices (CCDs) for use in a focal plane prototype for the Southern Astrophysical Research Integral Field Spectrograph (SIFS). We tested eight Skipper CCDs and selected six for SIFS based on performance results. The Skipper CCDs are 6k × 1k, 15 μm pixels, thick, fully depleted, p-channel devices that have been thinned to ∼250 μm, backside processed, and treated with an anti-reflective coating. We demonstrate a single-sample readout noise of <4.3 e− rms pixel−1 in all amplifiers. We optimize the readout sequence timing to achieve a readout noise of 0.5 e− rms pixel−1 after 74 non-destructive measurements, which can be accomplished in a region covering 5% of the detector area in a readout time of <4 minutes. We demonstrate single-photon-counting in all 24 amplifiers (four amplifiers per detector) with a readnoise of σ N ∼ 0.18 e− rms pixel−1 after N samp = 400 samples, and we constrain the degree of nonlinearity to be ≲1% at low signal levels (0 e− to 50 e−). Clock-induced charge (CIC) remains an important issue when the Skipper CCD is configured to provide a large full-well capacity. We achieve a CIC rate of <1.45 × 10−3 e− pixel−1 frame−1 for a full-well capacity of ∼900 e−, which increases to a CIC rate of ∼3 e− pixel−1 frame−1 for full-well capacities ∼40,000–65,000 e−. We also perform conventional CCD characterization measurements such as charge transfer inefficiency (3.44 × 10−7 on average), dark current (∼2 × 10−4 e− pixel−1 s−1), photon transfer curves, cosmetic defects (<0.45% “bad” pixels), and charge diffusion (point-spread function < 7.5 μm) to verify that these properties are consistent with expectations from conventional p-channel CCDs used for astronomy. Furthermore, we provide the first measurements of the brighter-fatter effect and absolute quantum efficiency (≳80% between 450 and 980 nm; ≳90% between 600 and 900 nm) using Skipper CCDs.

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Mechanical design of SIFS SOAR integral field unit spectrograph

Cited by 2 publications

References 1 publication

Design of a Skipper CCD focal plane for the SOAR integral field spectrograph

Design of a Skipper CCD focal plane for the SOAR integral field spectrograph

Characterization and Optimization of Skipper CCDs for the SOAR Integral Field Spectrograph

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