We present a preview of compatibility tests for index-matching fluids with commonly used optical assembly materials.
Although we focus on fluid candidates for GMACS, the results of the conducted experiments are applicable to all
instruments that use optical index-matching fluids. The experiment presented here aims to identify potentially corrosive
matchings of fluids and materials. In the experiment, a material (RTV, polyethylene, delrin, etc.) is submerged in a
quartz cuvette of fluid (Cargille liquids, glycerin, etc.). Contamination is observed by using a spectrometer to measure
the absorption spectrum at various post-submersion times. The current results have large measurement errors compared
to the signal, and no contamination appears to have taken place. We detail the source of these errors and make
suggestions for similar future experiments.
We present a spectrophotometric calibration system that will be implemented as part of the DES DECam project at the
Blanco 4 meter at CTIO. Our calibration system uses a 2nm wide tunable source to measure the instrumental response
function of the telescope from 300nm up to 1100nm. The system consists of a monochromator based tunable light source
that is projected uniformly on a Lambertian screen using a broadband "line to spot" fiber bundle and an engineered
diffuser. Several calibrated photodiodes strategically positioned along the beam path will allow us to measure the
throughput as a function of wavelength. Our system has an output power of 0.25 mW, equivalent to a flux of
approximately 100 photons/s/pixel on DECam. We also present results from the deployment of a prototype of this
system at the Swope 1m at Las Campanas Observatory for the calibration of the photometric equipment used in the
Carnegie Supernova Project.
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