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Task Outcome Summary

Abstract

In this task, diagnostic data is collected during 160um, 70um, and 24um thermal anneals. The anneals executed properly. The temperature plots from these anneals are presented in the report for metatask MIPS-2050. Following the anneals, a Vrst optimization is performed on the Ge arrays. The results 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. See the writeup for MIPS-2050 for details. This was our first campaign using new anneal currents, so the temperature curves are quite a bit different from what we have seen in earlier campaigns.

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 plots can be seen in the writeup for MIPS-2050. The temperature behavior was as expected for the new anneal currents.

Vrst Optimization

The Vrst data are presented below. The filenames are MIPS.2/3.0007985664.00**.tran.fits. I analyzed the data using SIRTFSEE. I ignored the first frame and the last 72 frames in the 70um Vrst slope calculations. I ignored the last 76 frames in the 160 Vrst slope calculations. 

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
02   Nom   40   -20   -20   -70   -60   -75   -15   -90   -25  -150   -36     0
03   +5   -80  -110  -140  -200   -90  -120   -40  -100  -923 -1026  -488  -297
04   +4   -55   -60  -110  -150   -60   -80   -35   -70  -838  -748  -401  -199
05   +3   -40   -25   -80  -125   -50   -60   -20   -60  -580  -538  -263  -127
06   +2   -20     0   -60  -100   -50   -70   -35   -65  -296  -355  -155   -67
07   +1     5    40   -35   -70   -40   -70   -30   -55   -43  -233   -50    -7
08   Nom   30    65   -10   -30   -15   -40   -10   -40   205   -99    47    44
09   -1    50    95    10   -20   -20   -40   -10   -40   469    22   142   101
10   -2    70   120    30     0   -45   -50   -40   -65   740   141   254   176
11   -3    90   145    50    30   -40   -50   -30   -60  1037   289   381   267
12   -4   110   160    75    40   -80   -85   -75  -100  1375   455   525   365
13   -5   125   175    95    70   -90  -100   -80  -105  1800   625   683   402
14   Nom    0   -15   -35   -60   -50   -50   -35   -60    88   -89    53    50

Vrst     +1.25 +2.0  -0.5  -2.0  ????  ????  ????  ????  +0.75 -0.75 +0.5  +0.75
DAC Counts +5    +8    -2    -8   -24   -20   -24   -28    +3    -3     2    +3
DAC NOM   90E   8F7   910   8E7   916   90B   920   905   97D   91C   91C   913
New DAC   913   8FF   90E   8DF   8FE   8F7   908   8E9   980   919   91E   916

The 70um B-side Vrsts did not converge to zero slope in this analysis. By using such a limited portion of the data ramp, the data were dominated by Ge behavior that resulted in a negative slope segment for a time after the reset. This result is anomalous, and a better result was obtained using the full data ramps.

All Vrst data were analyzed using mips_sloper and IDL routines. The results are presented in the writeup for metatask MIPS-2075.

No new updates are recommended to the mips-irs patch block at this time.

Conclusions

The thermal behavior of the arrays looks very good. The Vrst behavior is consistent with other data collected since we started performing proper Ge anneals. No Vrst changes are recommended at this time.

Output and Deliverable Products

None.

Actions Following Analysis

None.