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COS Cycle-21 Calibration Phase-1 Template

Last Revised: 30 August 2013
Proposal ID: TBD
Title: COS FUV Detector Gain Map
PI: David Sahnow
Co-I(s): Justin Ely

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# Orbit estimates are TOTAL for all of cycle-21; assume 72 weeks)

Total Prime Orbits: 0
External Parallel Orbits: 0
Internals or no-impact orbits: 4
Comments on orbit estimate: Two orbits are used each time the
nominal HV level is changed.


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# This section should be written with a GO audience in mind -- use
# Calibration plans in WFPC-2 handbook as a guide.

Purpose: Obtain data to create gain maps of the COS
FUV Detector before and after a change
to the high voltage level on either segment.
Description: Each time the nominal high voltage (HV) is
changed on either segment, deuterium lamp
exposures will be taken in order to measure
the gain over the part of the detector used
by the active Lifetime Position. An
identical visit will be executed after the
HV change. This data can be used to obtain
a definitive measurement of the gain at the
beginning and end of the time used by each
HV Level. The data will allow us to model
the lifetime of the detector as a function
of time and position.
Accuracy: 0.1
Comments on Accuracy: Value of the modal gain
Products: This data will be incorporated into the
regular CCI files in order to make initial
and final gain maps for each voltage level.


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# Link to Cycle 21 Science
# Use the GO + GTO Phase 1 exposure listing and derived statistics
# posted on WWW.

Fraction of science programs supported by this calibration: 90%

List categories of science which can't be executed until after this proposal:
why: None

List categories of science which are best performed contemporaneous with
this proposal:
why: None


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# THE REST OF THIS FORM IS FOR INTERNAL USE
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Observation summary:
Move the FCA to the appropriate location, then take deuterium
exposures with high enough S/N to obtain a good measurement of the
modal gain

# Target information (copy for each target)

Target Name.............................: DEUTERIUM
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..........................: DEUTERIUM
Type of Acquisition.....................: None
Detector for observation................: COS FUV
Operating mode .........................: TIME-TAG
Spectral Element........................: G130M
Aperture................................: FCA
Central Wavelength......................: 1309
Exposure Time...........................: 400s
Number of Iterations ...................: 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:

Target or lamp..........................: DEUTERIUM
Type of Acquisition.....................: None
Detector for observation................: COS FUV
Operating mode .........................: TIME-TAG
Spectral Element........................: G160M
Aperture................................: FCA
Central Wavelength......................: 1600
Exposure Time...........................: 400s
Number of Iterations ...................: 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:

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# Special needs of this proposal?

Scheduling: None

Prerequisites: None
PDB update? None
On-board table update? None

# Special Requirements:
Real time? N
Special commanding? N
Quick Data turnaround? N
Special timing required? N
Other? ELNOAPMAIN?
Describe (& justify) special requirements:


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# Analysis Plan

Expected FTE weeks for analysis: 0
Required turnaround on analysis (weeks): 0
Data volume (Mb needed for analysis): 0
Special software needed for analysis? (Describe): None

Description of analysis Plans: (1-2 paragraphs):
Analysis will be part of the normal CCI/gain sag monitoring, so
little or no special analysis will be required.