n MNASSA : Monthly Notes of the Astronomical Society of South Africa - SALT undergoing eye surgery : news notes

Volume 68, Issue 5_6
  • ISSN : 0024-8266



The Southern African Large Telescope (SALT) has been plagued by image quality problems, sometimes more severe than at other times. In between regular observations as well as during some dedicated engineering weeks, a whole series of tests were performed over the last three years as part of a meticulous investigation into the cause of this anomaly. The culprit was finally identified to be the SAC (Spherical Aberration Corrector), in particular its mounting interface onto the payload, aggravated by a degree of "print through" when the internal part of the payload gets rotated.

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