ICON integration and testing is underway at the Space Dynamics Lab in Utah

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The integration and testing processes for the ICON payload have begun! All of the instruments have been shipped to the Space Dynamics Laboratory (SDL) in Logan Utah and integrated into the payload deck, with the Instrument Control Package due for shipment by the end of the month. IVM-B is coming soon as well, closing out the full complement of instruments.

The integration and testing - or I&T - procedures are a vital part of preparing for flight. The instruments have been built all over the country - California, Texas, and Virginia. In order to ensure that they will be able to function together as planned, they are brought together on the Payload Integration Plate (PIP). The PIP, the instruments, and the Instrument Control Package together become the science payload, which will then undergo a series of thorough vibration and thermal tests at SDL over the coming months.

Following I&T, the payload will be shipped from Utah to Orbital ATK in Virginia, where it will be integrated onto the main spacecraft “bus” - the guts of the satellite that controls communication, attitude, and other overall controls. This will happen towards the end of 2016, in preparation for launch in summer 2017.

EUV Alignment and Calibration has begun

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ICON's Extreme Ultraviolet (EUV) instrument is an “imaging spectrometer”. Its 2 dimensional detector records spectral information over the range 58.4 to 83.4 nm in the one direction, and records 12 degree wide x 1/4 degree high slices of the sky over a 16 degree field of view in the other direction.

In preparation for alignment of the toroidal grating used in the EUV instrument, an optical system has been setup to simulate the cylindrical wavefront. This simulates the instrument’s view for each slice of sky while in orbit. The optical set up consists of a convex sphere and a concave toroid that produces a line image on the EUV entrance slit to simulate what EUV will observe in space. This optics pair will be used to first align the EUV instrument using visible light, then the final alignment will take place in a vacuum chamber using EUV radiation, since EUV light is not transmitted in air.

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ICON skin is based on Greytness by Adammer
Background image, courtesy of NASA, is a derivitave of photograph taken by D. Pettit from the ISS, used under Creative Commons license