COS Cycle-17 Calibration Phase-1 Template Last Revised: 2 February 2010 Proposal ID: TBD Title: COS FUV Detector Lifetime Position Test PI: David Sahnow Co-I(s): Tony Keyes, Steven Penton, Steven Osterman --------------------------------------------------------------------------- # Orbit estimates are TOTAL for all of cycle-17; assume 72 weeks) Total Prime Orbits: 3 External Parallel Orbits: 0 Internals or no-impact orbits: 0 Comments on orbit estimate: One-time test --------------------------------------------------------------------------- # This section should be written with a GO audience in mind -- use # Calibration plans in WFPC-2 handbook as a guide. Purpose: To identify the best regions on the FUV detector to use if and when a lifetime adjustment becomes necessary. Description: The FUV channel was designed with the ability to select up to five separate lifetime positions on the detector. Lifetime adjustments may be made in order to allow the spectra to fall on a cleaner region of the detector which has less gain sag, fewer hot spots, and/or fewer detector features. The purpose of this program is to identify the characteristics of the detector at all of the other lifetime positions so that a lifetime adjustment can be made quickly and easily when the time comes. The analysis will identify the detector characteristics at a number of Y locations on the detector so that the appropriate location to move to can be identified ahead of time. In addition, a strategy for the long-term use of the current position can be formulated once the characteristics of the other positions are determined. Finally, the exact Y positions for the four remaining lifetime positions may be fine-tuned after analyzing the data. Accuracy: N/A Comments on Accuracy: N/A Products: TIR on the detector characteristics at the various lifetime positions. --------------------------------------------------------------------------- # Link to Cycle 17 Science # Use the GO + GTO Phase 1 exposure listing and derived statistics # posted on WWW. Fraction of science programs supported by this calibration: 0% before a lifetime position adjustment; 100% after. List categories of science which can't be executed until after this proposal: None why: List categories of science which are best performed contemporaneous with this proposal: None. why: --------------------------------------------------------------------------- # THE REST OF THIS FORM IS FOR INTERNAL USE --------------------------------------------------------------------------- Observation summary: (e.g. Take spectra of G191B2B at each supported central wavelength of each grating with the CCD and the 52x0.5 slit.) # Target information (copy for each target) Target Name.............................: RA......................................: Dec.....................................: Flux (and units)........................: Visibility window (if known or relevant): Comment on choice of target: # Exposure list plan at the Phase I level. Be as complete as reasonable. # If possible information should be complete enough to allow easy # submission of a Phase 2 from this form. However, if you have to leave # some of the fields blank below, or want to provide the information # in another format, that is acceptable. (Make sure you do the BOP checking # though, as this is a phase-1 issue.) Table of exposures (copy for each exposure as appropriate/desired): Target or lamp..........................: e.g. G191B2B, or HITM Type of Acquisition.....................: e.g. ACQ-PEAK Detector for observation................: e.g. CCD Operating mode .........................: e.g. ACCUM or TIMETAG Spectral Element........................: e.g. G430L Aperture................................: e.g. 50x0.5 Central Wavelength......................: e.g. 4300 Exposure Time...........................: e.g. 300s, crsplit=2 Number of Iterations ...................: e.g. 1 BOP Predicted Local Count Rate for MAMA.: BOP Predicted Global Count Rate for MAMA: ETC PID IDs for Count Rates.............: Special Requirements or options.........: (e.g. GAIN=4; LOW-SKY) Comments: (e.g. if monitoring, specify frequency)
