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

The goal of this task is to verify the health of the 24um internal stimulators. The illumination patterns and brightness levels are found to be fully consistent with what was measured in ground tests.

Analysis

All data for this test were taken at the 24um internal dark position. For each stim setting, 3 4s DCEs were collected in SUR mode. The measurements included darks, 24Flood, and 24Flat stim measurements, all for CE1. Measurements were made at both the low and high stim brightness levels. Median brightnesses were measured for each DCE and compared to the results from ground testing. No special processing steps were taken in this analysis so that a direct comparison could be made to the ground test data.

Results

The following are the median brightnesses for each of the DCEs. 
Filename                                    median (DN/s)   Stim    Level
MIPS.1.0006757888.0000.0000.01.mipl.fits      1808         FloodB    low
MIPS.1.0006757888.0000.0001.01.mipl.fits      1908         FloodB    low
MIPS.1.0006757888.0000.0002.01.mipl.fits      1934         FloodB    low
MIPS.1.0006757888.0001.0000.01.mipl.fits         0         AllOff     --
MIPS.1.0006757888.0001.0001.01.mipl.fits        12         AllOff     --
MIPS.1.0006757888.0001.0002.01.mipl.fits        12         AllOff     --
MIPS.1.0006757888.0002.0000.01.mipl.fits      4114         FlatA     low
MIPS.1.0006757888.0002.0001.01.mipl.fits      4196         FlatA     low
MIPS.1.0006757888.0002.0002.01.mipl.fits      4226         FlatA     low
MIPS.1.0006757888.0003.0000.01.mipl.fits         2         AllOff     --
MIPS.1.0006757888.0003.0001.01.mipl.fits        14         AllOff     --
MIPS.1.0006757888.0003.0002.01.mipl.fits        14         AllOff     --
MIPS.1.0006757888.0004.0000.01.mipl.fits      8586         FloodB    high
MIPS.1.0006757888.0004.0001.01.mipl.fits      9172         FloodB    high
MIPS.1.0006757888.0004.0002.01.mipl.fits      9346         FloodB    high
MIPS.1.0006757888.0005.0000.01.mipl.fits        14         AllOff     --
MIPS.1.0006757888.0005.0001.01.mipl.fits        22         AllOff     --
MIPS.1.0006757888.0005.0002.01.mipl.fits        20         AllOff     --
MIPS.1.0006757888.0006.0000.01.mipl.fits     22948         FlatA     high
                         difference image    24530
MIPS.1.0006757888.0006.0001.01.mipl.fits     17262         FlatA     high
                         difference image    25520
MIPS.1.0006757888.0006.0002.01.mipl.fits     17220         FlatA     high
                         difference image    25682
MIPS.1.0006757888.0007.0000.01.mipl.fits        32         AllOff     --
MIPS.1.0006757888.0007.0001.01.mipl.fits        32         AllOff     --
MIPS.1.0006757888.0007.0002.01.mipl.fits        28         AllOff     --

The following results were found in ATLO ground testing with CE1:
           00-349 01-117   220   286 02-224  292 03-022  039   070  128   170
HTSINK Tmp: 2.255  1.965 1.547 1.463    4.5  5.4    ??  4.54  4.58       5.51
MICBP Tmp:  2.535  2.396 1.623 1.586    4.5  5.4    ??  4.75  4.79       5.68
24umFlatA:   4014   4068  4100  4114   4200 4280   4200 4190  4202 4272  4398
24umFloodB:  1896   1926  1930  1928   1940 1965   1950 1945  1953 1971  2014

The HTSINK and MICBP temperatures during campaign D1 were roughly 1.32K.
The expected brightness for 24FlatA was about 4100 +/- 100 DN/s, and for 
24FloodB the expected brightness was about 1930 +/- 30 DN/s.  The ground
test results are always for the 2nd DCE of a pair of stim DCEs, so the
comparison values from campaign D1 are 4196 DN/s and 1908 DN/s, both of
which lie within the expected range from ground testing.  There is not
adequate ground data to predict the bright stim levels.  They were set
very high for possible use in photon-flood anneals.   24FlatA is set
adequately bright for this purpose, but 24FloodB would need to be turned
up brighter if we wanted to use it for a photon flood anneal.
 
As had been seen from the ground, the slope measured by the first DCE in
each exposure is typically 5% lower than the value measured on subsequent
DCEs. (Could this be due to the spacecraft slope fitting algorithm assuming
that the exposure time for DCE0 is the same as all subsequent DCEs? The exposure
time for DCE0 is shorter by 1 second, due to the two bias boost frames at 
the start of the exposure.) However, the highly saturated 24FlatA observations 
have a higher median DN/s for DCE0 than for the two subsequent DCEs since 
the exposure time is shorter and the ramp saturates later in the ramp 
for the first exposure. This can be seen in the following plot:


Another interesting detail, also 
noted in ground testing, is that the array temperature responds to the 
level of illumination. The very bright 24FlatA stim produces a noticable 
rise in temperature, as seen in the following plot:



Operationally speaking, a sizable percentage of the array will have 
to saturate before the temperature is affected by more than 20 mK.

Conclusions

The 24um CE1 internal stims are both working nominally, with illumination patterns and brightness levels consistent with what was measured in ground testing.

Output and Deliverable Products

None from this preliminary analysis. Further analysis is needed to produce properly reduced, flatfielded, and calibrated stimulator images.

Actions Following Analysis

No actions are required based on this analysis. Further work is needed to understand the need and potential for using 24um stimulator observations for flux calibration, but that probably does not lie within the realm of this particular task.