9 August 2016 Calibrating the SNfactory Integral Field Spectrograph (SNIFS) with SCALA
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Abstract
The SNIFS CALibration Apparatus (SCALA), a device to calibrate the Supernova Integral Field Spectrograph on the University Hawaii 2.2m telescope, was developed and installed in Spring 2014. SCALA produces an artificial planet with a diameter of 1° and a constant surface brightness. The wavelength of the beam can be tuned between 3200 Å and 10000 Å and has a bandwidth of 35 Å. The amount of light injected into the telescope is monitored with NIST calibrated photodiodes. SCALA was upgraded in 2015 with a mask installed at the entrance pupil of the UH88 telescope, ensuring that the illumination of the telescope by stars is similar to that of SCALA. With this setup, a first calibration run was performed in conjunction with the spectrophotometric observations of standard stars. We present first estimates for the expected systematic uncertainties of the in-situ calibration and discuss the results of tests that examine the influence of stray light produced in the optics.
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Daniel Küsters, Simona Lombardo, Marek Kowalski, Greg Aldering, Jakob Nordin, Mickael Rigault, "Calibrating the SNfactory Integral Field Spectrograph (SNIFS) with SCALA", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99084V (9 August 2016); doi: 10.1117/12.2232902; https://doi.org/10.1117/12.2232902
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