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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.
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.
The temperature plots can be seen in the writeup for MIPS-2050. The temperature behavior during the anneal was nominal.
The Vrst data are presented below. The filenames are MIPS_IER_7853312_gen_*_A70/A160_Pukn_10s.fits. I analyzed the data using SIRTFSEE, so I used the first DCE in each pair of observations for this analysis, whereas I used the 2nd DCE in all previous analyses. 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. This campaign is the first one in which we had real Ge anneals, which is another difference that might be partially responsible for the noticeably different Vrst values that were determined 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 02 Nom 45 -150 -15 -110 -60 -70 15 -160 4 -152 -34 8 03 +5 -105 -150 -150 -220 -170 -200 -120 -170 -830 -1132 -532 -360 04 +4 -60 -60 -100 -170 -150 -160 -100 -150 -840 -806 -414 -242 05 +3 -35 -30 -80 -130 -110 -120 -90 -120 -570 -565 -277 -140 06 +2 -30 -10 -60 -90 -105 -130 -80 -120 -271 -367 -149 -70 07 +1 0 35 -30 -60 -80 -90 -70 -95 -4 -211 -40 -4 08 Nom 20 60 -5 -35 -90 -100 -70 -110 248 -81 60 57 09 -1 40 85 10 -20 -70 -60 -40 -70 527 55 169 122 10 -2 60 115 35 20 -50 -70 -30 -80 1015 182 294 223 11 -3 80 140 60 30 -35 -20 -20 -40 1113 330 427 317 12 -4 110 160 80 50 -25 -35 -20 -60 1457 489 618 436 13 -5 120 180 100 60 -15 0 -10 -40 1901 677 772 577 14 Nom -30 -70 -60 -120 -110 -120 -100 -130 90 -93 23 56 Vrst +1.0 +2.0 -0.25 -1.5 -6.0 -5.0 -6.0 -7.0 +1.00 -0.5 +0.5 +1.0 DAC Counts +4 +8 -1 -6 -24 -20 -24 -28 +4 -2 2 +4 DAC NOM 90E 8F7 910 8E7 916 90B 920 905 97D 91C 91C 913 New DAC 912 8FF 90F 8E1 8FE 8F7 908 8E9 981 91A 91E 917
The 70um B-side Vrsts (modules 5-8) made a noticeable jump in this campaign, following the first real thermal anneals. This change needs to be tracked. The offset of the ramp slopes also changed during this campaign, so the change in Vrst values is likely to be real. The change is 2.5-3.5 mV.
No new updates are recommended to the mips-irs patch block at this time.
I want to look at the Vrst values using my new, automated IDL routines
to confirm the magnitude of the change in Vrst values.
Conclusions
The thermal behavior of the arrays is nominal. The Vrst behavior is
fairly different from previous campaigns, but no Vrst changes are
recommended at this time.
Output and Deliverable Products
None.
Actions Following Analysis
None.