Future high-resolution x-ray telescope technologies: prototype fabrication methods and finite element analysis

Abstract

The Smart X-ray Optics (SXO) project is a UK based consortium consisting of several institutions investigating the application of active/adaptive optics to both large and small scale grazing incidence x-ray optics. University College London presents work relating to the large scale x-ray optics that is geared towards the next generation of x-ray space telescopes. It is proposed that through the addition of piezoelectric actuators, an active x-ray telescope with a resolution better than that currently achieved (e.g. Chandra 0.5") could be realised. An immediate aim of the SXO project is to produce an operational active ellipsoidal segment prototype, with pointto-point focusing and with the intention of being tested at the University of Leicester's x-ray beam source. Work relating to the fabrication of the prototype will be presented, including shell replication via a nickel sulphamate electroforming process, piezoelectric actuators and prototype assembly and operation. Results from finite element analysis modelling will be discussed; these relate primarily to gravitational distortion effects and the plating tank electrostatics.

Toward active x-ray telescopes

“…For the SXO investigation, University College London (UCL) electroformed nickel mirrors, replicated off an electroless-nickel-plated aluminum mandrel 19,20 . UCL figured and polished the slab mandrel to a grazing-incidence ellipsoidal prescription, which the University of Leicester (UoL) had specified in order to allow point-to-point focusing in its 28-m x-ray Tunnel Test Facility (TTF).…”