Sequencer Site SIRTF IOC Activity c. 2002

CAID: MIPS-345 Title: 24um Optimum Operating Temperature
 
System: MIPS Principal: dlp Deputy: dmkelly, jmuzerolle
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 
of
detector operating temperature. At each of five 
detector temperature settings (use same set 
as 
in CTA):	
(1) Take 25 30-second exposures (2 cycles 
small 
field 24um photo AOR) with the scan mirror in 
the dark position.
(2) Using the 10 second exposures, measure 
a 
moderately bright star using a small field 
dither
pattern (1 cycle).
(3) Move the scan mirror to place the 160um 
array 
into the dark.
(4) Take 25 10-second exposures (3 cycles 
small 
field)  with the 160um array to check for
scattered emission from the 24um array.
 
Day:   77.3777777777868 Suggested Order:   I100
 
Must be preceded by these activities (list by CAID):   MIPS-260
 
Place in Schedule:   After aperture door is opened, after MIPS first light, after temperature is stablized at 5.5 K.
 
Priority:   Desired

Conditions

Maximum telescope temperature: 6 K
 
Minimum telescope temperature: 5.5 K
 
Should activity be repeated if focus changes?   No     Repeat if focus changes by 0 mm
 
Maximum absolute pointing uncertainty: 20 arcsec (1 sigma radial)
 
Maximum precision offset uncertainty: 20 arcsec  (1 sigma radial)
 
Observatory configuration: standard
 
Go/No Go criteria: CE operating, CSMM nominal, temperature at stable minimum

Resources

Duration:   90 minutes
 
Real time downlink:   No   

Data Volume (uncompressed): 250 Mbits
 
List Blocks, AORs, SERs, IERs, or unique sequences required (uplink): Will use dark current IER, photometry AOT
 
List Analysis tools required (downlink):   MIPS pipeline, image analysis tools

Outcome

Estimate of data turn around:   5 hours
 
Description: Best temperature setting for the 24um array will be known.
 
Can proceed in parallel with other activity: No
 
Must outcome be confirmed before next activity: No
 
Method of Confirmation:   data analysis
 
 
Success criteria: Temperature is successfully manipulated (i.e. heater works), CSMM works, star unsaturated, data completely downlinked. Latent images are as expected from ground tests.
 
Contingency plan: 
 
 

Comments

 
References:  
 
Additional Comments:
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 Generates 330 DCEs.
 
This activity last updated: 5/14/2002 10:53:23 AM