Lifetime Test of a Deuterium Lamp for the WFC3 Calibration Subsystem

Details Lifetime Test of a Deuterium Lamp for the WFC3 Calibration Subsystem Lifetime Test of a Deuterium Lamp for the WFC3 Calibration Subsystem

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003wfc..rept...11b&link_type=abstract

Instrument Science Report WFC3 2003-11, 11 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Calibration Subsystem

Scientific paper

A lifetime test has been performed on a flight-like deuterium (D2) lamp for the WFC3 calibration subsystem. The lamp survived and was functioning nominally at the end of the test, after more than 850 on/off cycles, and a total of more than 500 hours of on-time. Analysis of the flux monitoring data taken during the test shows that 1) all cycles have a characteristic warmup time of a few minutes (shorter for lower current settings) 2) the flux output stabilizes to 1-2% within a cycle after the warmup (~3% for long high current cycles), and 3), though there are occasional episodes of small flux increases, the overall flux output decreases slowly over many cycles such that by the end of the test the fluxes were degraded by ~13%, 5%, and 8% for high, medium, and low current settings, respectively. The medium current setting of this lamp provided the most stable long and shortterm flux output. Spectra taken at the test mid- and end-points are identical to within the errors of the measurements; however, the spectrum taken before burn-in did exhibit more flux over the entire spectral region than the later spectra, consistent with the flux monitoring measurements.

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