Development of technologies for production of high quality grazing incidence x-ray mirrors on graphite epoxy substrates.

Details Development of technologies for production of high quality grazing incidence x-ray mirrors on graphite epoxy substrates. Development of technologies for production of high quality grazing incidence x-ray mirrors on graphite epoxy substrates.

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990opten..29.1260e&link_type=abstract

Opt. Eng., Vol. 29, No. 10, p. 1260 - 1266

Computer Science

Performance

1

Mirrors: X-Ray Telescopes

Scientific paper

The design concept of the mirrors for ESA's high throughput X-ray spectroscopy mission XMM is characterized by thin (≤1 mm) graphite epoxy shells as the mirror structure and a replication technique to produce the mirror surface. The mirror microroughness is specified to σ ≤ 0.5 nm (rms); profile errors should not exceed ±2.5″ An ESA research study has been performed to clarify whether graphite epoxy mirror structures are able to meet the tight XMM mirror figuring and surface requirements and to determine what measures have to be taken to overcome the typical problems associated with composite materials used as mirror substrates, such as print-through of fibers and inner structure, short term/long term stability, and water absorption and outgassing. The starting conditions and progress during development are described. The present status of optical and X-ray performance of replicated flat graphite epoxy mirrors is reported, and aspects for further improvement of graphite epoxy mirrors is discussed.

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