FOS Cycle 5: Focus, X-Pitch and Y-Pitch

Details FOS Cycle 5: Focus, X-Pitch and Y-Pitch FOS Cycle 5: Focus, X-Pitch and Y-Pitch

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6163m&link_type=abstract

HST Proposal ID #6163

Physics

Hst Proposal Id #6163

Scientific paper

After warm-up to the nominal high voltage, the trim current is set to the detector default, and the HV is set to a lower value. Spectra are then obtained with the 0.1-PAIR aperture, G190H, and the Pt-Ne lamp. The high-voltage is then varied in 200 volt increments +/- 600 volts from the nominal setting with spectra taken at each setting. This will allow for optimal focus determination. Once a optimal HV setting is determined and updates made to the PDB, a series of spectra at three different X-Bases will be made to determine the corresponding X-Pitch. Additionally, measurements with the TALEDs through the 0.1-Pair aperture will be used to determine Y-Pitch. This program may result in an instruction flow change to the detector high voltage setting, the x-pitch value, the y-pitch value. This program must be run in early Cycle 5 because the focus is sensitive to external magnetic fields. The 3 runs are to be scheduled 6 months apart.

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