Analysis of startup, shutdown and middle sequences, Campaign 7 Abstract: All SRSRN results are within limits. Both the SL and LH SURN results exceed their limits in two cases (out of six). The rest of the SURN results are well behaved. SL is the only module with strong variations in SURN during the campaign, with variations right up to the 20% yellow limit. None of the other modules vary by more than 8%. LL has two unstable pixels in the photostability test; neither were unstable in the previous campaign, and as has happened in previous campaigns, apparent changes in background radiation cause many pixels in LL to vary more than the 5% yellow limit. Analysts: Lei Hao & Greg Sloan Procedure version: 2.7 Campaign 7, Startup, Shutdown and Mid-campaign anneal YEAR 2004 DOY 132 CE1 used for all data collection AORKEY = 9766144 for startup AORKEY = 9765632 for the mid-campaign anneal sequence AORKEY = 9765888 for shutdown Number of files = 64 for each No known errors. Steps 2 through 5 run OK. Unruly.pro results for startup (IRS-001): Noise characteristics of the modules (in DN) SUR data SRS data noise pre post noise pre post Module limit anneal anneal limit anneal anneal SL 8.8 8.3 8.7 15.0 12.1 12.3 SH 8.8 6.9 6.6 15.0 12.8 12.7 LL 14.5 12.1 12.5 15.0 13.1 13.1 LH 17.6 16.7 17.3 15.0 13.1 13.0 Unruly.pro results for middle (IRS-002): Noise characteristics of the modules (in DN) SUR data SRS data noise pre post noise pre post Module limit anneal anneal limit anneal anneal SL 8.8 8.1 8.5 15.0 12.3 12.4 SH 8.8 6.5 7.2 15.0 12.8 12.7 LL 14.5 13.0 12.8 15.0 13.0 13.0 LH 17.6 18.6 17.3 15.0 13.1 13.1 Unruly.pro results for shutdown (IRS-003): Noise characteristics of the modules (in DN) SUR data SRS data noise pre post noise pre post Module limit anneal anneal limit anneal anneal SL 8.8 10.2 10.1 15.0 12.2 12.3 SH 8.8 6.8 7.4 15.0 12.9 12.7 LL 14.5 12.7 11.4 15.0 12.9 12.8 LH 17.6 17.7 16.8 15.0 13.2 13.0 The analysis applied the PIRAT procedure unruly.pro to FITS files generated by MIPL. For SUR data, the quoted values are the standard deviation of the read noise map. For SRS data, these are the median of the standard deviation map. Comments: All SRSRN data are within limits. Most SURN results are also within limits. The exceptions are two SL SURN measurements in the shut-down sequence, which exceeded the limit by over 10%, and two LH SURN measurments, which exceeded the limit by smaller amounts, 18.6 and 17.7 DN vs. 17.6 DN in the mid-campaign and shutdown sequences, both before the anneal. Changes in read noise between anneals and from startup to shutdown: SUR data SRS data 002pre/ 003pre/ 003pre/ 002pre/ 003pre/ 003pre/ Module 001post 002post 001post 001post 002post 001post SL 0.93 1.20 1.17 1.00 0.99 0.99 SH 0.99 0.94 1.02 1.00 1.01 1.01 LL 1.04 0.99 1.02 1.00 0.99 0.99 LH 1.08 1.02 1.02 1.00 1.01 1.01 Comments: SRSRN is behaving well and has variations within 1%. The SL SURN still has the biggest variation. The pattern is the same as previous campaigns: The mid-campaign to shutdown varies most, just past the 20% yellow limit. The change is 7% from startup to mid-campaign, and 14% over the full campaign. The other modules behave well, with variations no greater than 8% Photoresponse stability: Module 002 pre to 001 post 003 pre to 002 post 003 pre to 001 post yellow red yellow red yellow red SL 0 0 0 0 0 0 SH 0 0 0 0 0 0 LL 782 2 5 1 6 2 LH 2 0 1 0 0 0 Only LL has pixels exceeding the red limit. In the 002/001 and 003/001 ratios, the same two pixels are the culprits: 76,64 and 23,119. One of these (76,64) also fails in the 003/002 ratio. The pixels in LH which exceed the yellow limit are 13,12 and 63,86 in the 002/001 ratio and 57,15 in the 003/002 ratio. Note that pixel 5,122, which has been misbehaving in most campaigns, is within the yellow limit here. SL and SH have no unstable pixels in this test. As in previous campaigns, LL has many pixels exceeding the yellow limit in one ratio, and we attribute this to changes background in from the startup to the mid-campaign anneal sequence.. A channel-by-channel analysis of the SURN in SL. The report for Campaign 6 explains the nature of this test. activity measurement total SURN ch. 0 ch. 1 ch. 2 ch. 3 IRS-003 pre-anneal 10.23 9.12 8.45 13.23 8.97 IRS-003 post-anneal 10.14 10.62 9.66 9.53 10.72 These results are similar to those for Campaign 6, in that the behavior of the standard deviation of the individual channels compared to the combined sample is inconsistent with jailbarring as an explanation for why the SURN results exceed the 8.8 DN limit. In Campaign 6, channel 0 was the highest in 3 of 4 examples; here, it is not the highest in either case. We do not have any ready explanation for the instability of the SURN for SL.