Performance analysis of the developmental cryogenic active telescope testbed (DCATT)

Details Performance analysis of the developmental cryogenic active telescope testbed (DCATT) Performance analysis of the developmental cryogenic active telescope testbed (DCATT)

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3356..161y&link_type=abstract

Proc. SPIE Vol. 3356, p. 161-175, Space Telescopes and Instruments V, Pierre Y. Bely; James B. Breckinridge; Eds.

Physics

Optics

Scientific paper

Various efforts are underway to demonstrate hardware for the NGST. One such effort is the development of the DCATT testbed. This testbed is an NGST effort geared to demonstrating in hardware the end-to-end system functionality. The system includes a segmented telescope, active optics subsystem with a deformable mirror (DM), and a wavefront sensor. The degree to which the DCATT can demonstrate this functionality depends crucially on its performance. A system performance analysis of this testbed is presented. The analysis is based on the design of the DCATT developed by Goddard and JPL. In the analysis, the performance of the system as a function of key system factors is calculated. These factors include the following: control, environmental, fabrication, alignment, and design. The performance after correction by the DM is required to be diffraction-limited at a wavelength of 2.0 microns. The flowdown of this performance is called the corrected error budget. To fully characterize the testbed performance as a system, one must develop a budget for the performance of the system before action of the DM. The flowdown of this performance is called the uncorrected error budget. The top line of this budget is related to the correction capability of the DM.

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