Details of COS TAGFLASH Execution

Details Details of COS TAGFLASH Execution Details of COS TAGFLASH Execution

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011cos..rept....4k&link_type=abstract

Instrument Science Report COS 2011-04, 24 pages

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Cosmic Origins Spectrograph, Cos, Space Telescope Science Institute, Hubble Telescope, Hst

Scientific paper

The primary procedure used to obtain COS wavelength calibration observations for TIMETAG science data-taking with the PSA aperture utilizes flashes of the wavelength calibration lamp during science exposures via the FLASH=YES (or so-called TAGFLASH) specification. Description of the characteristics of TAGFLASH exposures, particularly how to determine a priori the automatic placement of lamp flashes in the exposure timeline, is the primary purpose of this document. We provide a thorough description of the timing and duration of TAGFLASH exposures for all cases in which they may be obtained (see especially Table 2). Brief descriptions of the characteristics of other methods of obtaining COS wavelength calibration exposures are also given. Lastly, an appendix provides a complete chronology of wavelength calibration exposure characteristics (lamp current, exposure durations) for all COS spectral elements from initial development prior to the 2003 Thermal-vacuum testing through current on-orbit operations. This ISR expands upon and supersedes a discussion found in Chapter 13 of the COS Instrument Handbook (IHB) version 1 which is not included in later versions of the COS IHB. Specifications of current on-orbit operational characteristics are identical with values found in the Cycle 19 Proposal Instructions.

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