Harvard-Smithsonian Center for Astrophysics
XRT E2E Test
Day 20050611 Shift A
Test Conductor B. Podgorski
Shift Scientists J. Cirtain & M. Cosmo
Core PSF with Temperature Gradient Around Mirror
This subtest, numbered 18 in the as-run procedure, was initially
designed to produce a temperature gradient around the mirror's
cicumference. The procedure called for a temperature of 10 C for this
test but it was decided to instead operate at 15 C. This was required
since the heaters were
saturating and incapable of setting up the required gradient. The
temperature gradient was achieved late during shift A and the test
completed. We were able to complete the anaysis of the PSF RSS sigma
widths as a function of focus position,
and the best focus position was found to be 12 um from the previous
BF position (-515 um to -503 um). This is within the
error in the measurement (of order 40 um), so the telescope is insensitive to the
temperature gradient.
