11 February 2003 RHESSI imager and aspect systems
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RHESSI uses nine Rotating Modulation Collimators (RMCs) for imaging, each consisting of a pair of grids mounted on the rotating spacecraft. The angular resolutions range from 2.3 arcsec to 3arcmin. The relative twist between the two grids of each pair is the most critical parameter. It must be less than 20 arcsec for the finest grid. After precision alignment, it is monitored by the Twist Monitoring System (TMS) to a few arcsec. The Sun-pointing must be known better than 0.4 arcsec for the image reconstruction. This is achieved by the Solar Aspect System (SAS), which consists of a set of three Sun sensors. Each sensor is focusing the filtered Sun light onto a linear CCD. The onboard Aspect Data Processor (ADP) selects the 6 limb positions, which over-define the pointing offset of the Sun center in respect to the imaging axis of the imager. The Roll Angle System (RAS) continuously measures the roll angle of RHESSI within arcmin accuracy. The RAS is a continuously operating CCD star scanner. The time of the passage of a star image over the CCD is recorded and defines the roll angle, comparing its pixel position and amplitude with a star map.
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Alex Zehnder, Alex Zehnder, Jacek Bialkowski, Jacek Bialkowski, F. Burri, F. Burri, Martin Fivian, Martin Fivian, Reinhold Henneck, Reinhold Henneck, A. Mchedlishvili, A. Mchedlishvili, P. Ming, P. Ming, J. Welte, J. Welte, Knud Thomsen, Knud Thomsen, David Clark, David Clark, Brian R. Dennis, Brian R. Dennis, Gordon J. Hurford, Gordon J. Hurford, David W. Curtis, David W. Curtis, Peter R. Harvey, Peter R. Harvey, David H. Pankow, David H. Pankow, "RHESSI imager and aspect systems", Proc. SPIE 4853, Innovative Telescopes and Instrumentation for Solar Astrophysics, (11 February 2003); doi: 10.1117/12.460290; https://doi.org/10.1117/12.460290


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