The High Energy Focusing Telescope (HEFT) is a balloon-borne system for obtaining arcminute imagery in the 20-100 keV energy band. The hard X-ray optics are baselined to use thin epoxy-replicated aluminum foil substrates coated with graded-d multilayers, and we show some results on X-ray performance of prototype foil substrates. We also propose an extremely promising alternative substrate -thermally-formed glass. The advantages of thermally-formed glass substrates, their fabrication and preliminary metrology on sample pieces are discussed. Ifultimately feasible, the thermally-formed glass is a better substrate due to its superior hard X-ray reflectivity and scattering properties in comparison to similarly coated epoxyreplicated aluminum foil. We also discuss some preliminary work on the HEFT mirror mounting concept and the associated angular resolution error budget.
|Journal||Proceedings of the SPIE - The International Society for Optical Engineering|
|Publication status||Published - 1997|
|Event||EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VIII - San Diego, CA., United States|
Duration: 27 Jul 1997 → 27 Jul 1997
|Conference||EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VIII|
|City||San Diego, CA.|
|Period||27/07/1997 → 27/07/1997|