Correction and Control of X-ray Mirror Shape using Stress-Based Methods

Densely stacked arrays of x-ray mirrors serve as lenses for space-based x-ray telescopes.  They operate at small angles of grazing incidence.  Ideally they resemble thin foils, but with extremely precise shape (surface figure).  The smallest forces (stress in thin-film coatings, mounting forces, gravity, thermal gradients, etc.) can distort their figure beyond tolerances.  We are developing deterministic stress-based methods (ion-implantation, thermal oxide patterning, laser micro-stressing) that can counteract these forces to obtain desired mirror shapes.  As part of this project we also need to develop high-accuracy metrology for cylindrical surfaces, and methods for quasi stress-free mounting.  See here for more detail.

Team Members