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Phase I: 11892

COS Cycle-17 Calibration Phase-1 Template

Last Revised: 
Proposal ID: 11892
Title: NUV Detector Recovery after Anomalous Shutdown
PI: T. Wheeler
Co-I(s): A. Welty (STScI)
         D. Sahnow (JHU)
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# Orbit estimates are TOTAL for all of cycle-17; assume 4 weeks 
# 01 March 2009, 01 September 2009, 01 March 2010

Total Prime Orbits:                  0
External Parallel Orbits:            0
Internals or no-impact orbits:  2
Comments on orbit estimate:   Program to execute when needed
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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:  Recover NUV detector using slower than nominal high-voltage 
          rampup and obtain diagnostics needed to check health during 
          rampup.

                                      
Description:    This program executes three tests to check NUV-MAMA health 
                after an anomalous shutdown: (1) Signal processing 
                electronics check. This reduces amplifier thresholds to 
                0.28V and monitors the ORCOUNT rate. (NUV HV is off during 
                this procedure); (2) Slow, intermediate high voltage 
                ramp-up. The NUV is ramped up to an MCP voltage 300V below 
                the nominal operating value. A dark time-tag exposure is 
                taken during this partial ramp-up. Then another time-tag 
                dark exposure during which the event counter is cycled 
                through W, X, Y, Z, OR, EV and VE modes; (3) Slow, full 
                high voltage ramp-up. The NUV is ramped to its nominal MCP 
                voltage. A dark time-tag exposure is taken during this full 
                ramp-up. Then another time-tag dark exposure is obtained 
                during which the event counter is cycled through W, X, Y, 
                Z, OR, EV, and VE modes.
               
Accuracy:  N/A 

Comments on Accuracy:
     
Products:  Report 



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# THE REST OF THIS FORM IS FOR INTERNAL USE
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# Target information (copy for each target)

Target Name.............................: n/a (internal)	
RA.............................................: n/a 		
Dec...........................................: n/a		
Flux (and units)........................: n/a	
Visibility window (if known or relevant): n/a
Comment on choice of target: n/a

# Table of exposures (copy for each exposure):

Target or lamp..........................: 
Type of Acquisition.....................: 
Detector for observation................: 
Operating mode .........................: 
Spectral Element........................: 
Aperture................................: 
Central Wavelength......................: 
Exposure Time...........................: 
Number of Iterations ...................: 
BOP Predicted Local Count Rate for MAMA.: 
BOP Predicted Global Count Rate for MAMA: 
ETC PID IDs for Count Rates.............: 
Special Requirements or options.........: 
Comments: Take exposure every six months  
                                          
Target or lamp..........................: 
Type of Acquisition.....................: 
Detector for observation................: 
Operating mode .........................: 
Spectral Element........................: 
Aperture................................: 
Central Wavelength......................: 
Exposure Time...........................: 
Number of Iterations ...................: 
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........: 
Comments: Take exposure every six months.

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# Special needs of this proposal?

Scheduling: Program to execute when needed

Prerequisites: n/a

PDB update?               no
On-board table update?    no

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


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# Link to Cycle 17 Science

Fraction of science programs supported by this calibration: 25% of COS

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:

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Expected FTE weeks for analysis:            1   
Required turnaround on analysis (weeks):    
Data volume (Mb needed for analysis):       
Special software needed for analysis? (Describe): 

Description of analysis Plans: