Contact Stansberry - "; echo " there is a problem w/ your write-up.\n"; return ; } $row = mysql_fetch_array($result); $title = $row["title"]; $princ = $row["principal"]; $deputy= $row["deputy"]; $campn0 = $row["campn0"]; $aorkeys = $row["aorkeys"]; // get real name of principal, deputies $princ = ioc_get_person($princ); $princ = $princ[0]; $deps = explode(",",$deputy); foreach ($deps as $depty) { $depty = trim($depty); $depty = ioc_get_person($depty); $depty = $depty[0]; $depty = explode(",",$depty); $depty = $depty[0]; // last names only $deplist[] = $depty; } $deplist = implode(", ", $deplist); $caid = sprintf("%03d",$caid); $file = "mips-".$caid.$campn.".analysis.php"; // END PHP. ?> <? echo "MIPS-$caid, Campaign $campn IOC/SV Analysis"; ?>

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Task Outcome Summary

Abstract

This task has four parts to it. First, a set of 10 3s SUR DCEs is collected with the same pointing that will be used later for the Vrst optimization. The goal is to get a before and after thermal anneal comparison of the responsivity of the 24um array. Second, diagnostic data is collected during 160um, 70um, and 24um thermal anneals. The third MIPS-992 activity is a Vrst optimization on the Ge arrays. The final activity in MIPS-992 is the state transitions Observe --> Ready --> Operate (i.e. MIPS off), and then Operate --> Boot --> Off. The successful completion of the transition was confirmed by the lack of any unexpected errors during the state transition. The thermal data from this task were nominal and are presented in the metatask mips-2050. The before and after anneal 24um data and Vrst optimization data are presented below.

Analysis

We converted the diagnostic data from the thermal anneal into temperatures and generated temperature plots. These data are compared to the temperature curves from previous anneals. These data are presented in the metatask writeup mips-2050.

We compared the 24um SUR data taken before and after the thermal anneal to look for changes in array behavior. The item of interest was the detector responsivity. The data were reduced with mips_sloper with no flags. The source and sky brightnesses were measured with the IRAF task imexamine with radius=6, buffer=5, width=5, background=yes, center=yes, iterations=1.

A Vrst analysis was performed on the Vrst data. In this test, the bias voltages for the 70um and 160um arrays are set to 0 mV, and then the Vrst voltages are adjusted between +5 mV and -5 mV relative to normal. A bright stim is turned on in manual mode during the test. The principle is that the array will produce a strong positive slope when positively biased and a strong negative slope when negatively biased, so the zero bias voltage point can be easily recognized. In practice, we calculate slope images and then look for this transition point.


Results

Temperature Plots from Anneal

The temperature behavior during the anneal was nominal. The temperature plots can be found in the writeup for MIPS-2050.

24 µm Responsivity

A star was present in the field during the running of MIPS-992. The sky brightnesses and star fluxes are presented below. I excluded all bias boost DCEs since they give false slope values. Only the first DCE in the first set of data was a boost frame, whereas 13 2-DCE exposure commands were used in the post-anneal data so all 13 post-anneal DCEs are the first DCE after the boost frame. 
Pre-anneal flux levels, MIPS-992 
mips_IER_7529984_pht_A24_Pukn_pos-1_3s.red.fits
DCE  Flux   MeanSky
 2   11992.    940.
 3   12342.   943.8
 4   12521.   944.6
 5   12113.    947.
 6   12493.   948.7
 7   12595.    948.
 8   12430.   948.3
 9   12233.   949.3
10   12425.   949.3

Post-anneal flux levels, MIPS-992 
mips_IER_7529984_pht_A24_Pukn_pos-1_10s.red.fits
DCE  Flux   MeanSky
 1   11208.   932.2
 2   11272.   933.6
 3   11335.   933.8
 4   11409.   933.5
 5   11530.   933.
 6   11285.   935.
 7   11365.   935.7
 8   11522.   933.5
 9   11293.   935.
10   11362.   934.2
11   11404.   934.4
12   11233.   935.1
13   11313.   935.5

The apparent difference in sky and source levels is highly suspect. The source was about 18 pixels from the array edge in the 3s data and only 6 pixels from the edge in the 10s data. The difference in integration times is also a possible contributor to the difference in brightnesses. It is also important to notice that DCE 2 is low compared to the other DCEs, and all DCEs in the post-anneal set are DCE 2's.

The Vrst data are presented below. The filenames are MIPS.2/3.0007529984.00??.0001.01.mipl.fits. For 70um readouts 5-8, the ramps started below the bottom rail of the A-D converter so it was not possible to measure negative slopes. Instead, we extrapolated the slope vs bias curves down to zero slope. This is a much less accurate method, and these values are highly suspect. Much better values were determined in campaign I, and they supercede the numbers presented below. 

File Bias 70_1  70_2  70_3  70_4  70_5  70_6  70_7  70_8 160_1 160_2 160_3 160_4
03   Nom   60    10     0  -150    ---   ---   ---   ---  -92  -162   -47   -14
04   +5  -320  -440  -450  -450    ---   ---   ---   --- -559  -604  -323  -195
05   +4  -210  -200  -270  -340    ---   ---   ---   --- -453  -430  -232  -124
06   +3  -160  -210  -180  -230    ---   ---   ---   --- -288  -288  -155   -78
07   +2   -80  -110  -140  -200    ---   ---   ---   --- -165  -194   -94   -40
08   +1   -10     0   -70  -110    ---   ---   ---   ---  -50  -119   -43   -13
09   Nom   70   110     0   -70    ---   ---   ---   ---   44   -58     9    21
10   -1   130   170    50     0    ---   ---   ---   ---  137    -2    54    50
11   -2   200   220   110     0    ---   ---   ---   ---  257    53   103    84
12   -3   240   320   220    70    ---   ---   ---   ---  408   132   166   140
13   -4   300   330   250    70    ---   ---   ---   ---  564   185   246   181
14   -5   350   370   310   120    ---   ---   ---   ---  745   278   337   258
15   Nom -100  -120  -170  -300    ---   ---   ---   ---   57   -33    26    24
Vrst     +1.0  +1.0   0.0  -1.5  -1.0  -2.0  -1.0  -0.5  +0.5  -1.0   0.25 +0.5
DAC Counts +4    +4     0    -6    -4    -8    -4    -2    +2    -4     1    +2
DAC NOM   90E   8F7   910   8E7   916   90B   920   905   97D   91C   91C   913
New DAC   912   8FB   910   8E1   912   903   91C   903   97F   918   91D   915
          I-1211
03   Nom -1.3096
04   +5  -1.3145
05   +4  -1.3135
06   +3  -1.3124
07   +2  -1.3114
08   +1  -1.3103
09   Nom -1.3093
10   -1  -1.3086
11   -2  -1.3074
12   -3  -1.3068
13   -4  -1.3058
14   -5  -1.3043
15   Nom -1.3094


Conclusions

The Vrst values for the A-side of the 70um array and for the 160um array are close enough to flight nominal that no changes will be made until we collect enough data in future campaigns to assess stability and offsets. The thermal anneal behavior for this campaign is nominal. There is some evidence of a 24um response change with radiation exposure, but the data are highly suspect so the result is inconclusive.

Output and Deliverable Products

None.

Actions Following Analysis

None.