MIPS_345a 24um Operating Temp

IOC-MIPS_345a     10470C          
Title:   Optimum Operating Temperature for the MIPS 24um Array            
                 
Objective:   Determine what temperature yields the best overall performance of the 24um array.            
                 
                 
Description:     Dark current, responsivity, and latent image behavior need to be characterized as a function          
including flow / state diagram     of detector operating temperature.          
      At each of five detector temperature settings (use same set as in thermal-vac):          
        Take 25 30-second exposures with the scan mirror in the dark position.        
        Using the 10 second exposures, measure a moderately bright star using a 4x4 dither pattern.        
        Move the scan mirror to place the 160um array into the dark.        
        Take 25 10-second exposures with the 160um array to check for scattered emission        
        from the 24um array.        
                 
Place in Schedule:   After aperture door is opened.          
(relative to water shed events)                
                 
Required Conditions:   Basic MIPS operation must be confirmed including detector and electronics aliveness tests.          
      MIPS 24um aperture must have been located.          
      Background must be less than 2e-8 W/cm^2/sr          
      or T<6.5K          
Resources:                
                 
  duration (best estimate)         1.5 hr    
  real time downlink (Y / N)         no    
  special post event actions (Y / N)         no    
  Generates 330 DCEs.              
                 
Outcome:                
  description         Best temperature setting for the 24um array will be known.    
  can proceed in parallel with other activity       No, requires some dedicated pointing.    
  must outcome be confirmed before next event / test /activity         No    
  method of confirmation (sensor TLM, data analysis, etc.)         data analysis    
  estimate of data turn around if required for confirmation         N/A    
                 
Unique or included in planned AOT?                
            Will use dark current IER, photometry AOT    
               
Contingency Plan:                
"What if..."              
                 
IOC Critical           Y    
                 
References:                
                 
Template last updated:         7-Sep-99    
            M. Rieke    
                 

Last Updated on 10/7/99
By Marcia Rieke
Email: mrieke@as.arizona.edu