Analysis of startup, shutdown and middle sequences, Campaign 11 Abstract: All SRSRN results are within limits. The SURN results for both SH and LL are within limits in all cases, but SL slightly exceeds the limit twice and LH slightly exceeds the limit three times, although it appears to be less noisy than in previous campaigns. LL exceeds the SURN stability limit in the first half of the campaign, with a 25% variation. The other modules are better behaved. The photoresponse stability test shows that pixel 76,64 in LL continues to fail consistently, as it has from Campaign 7. Pixel 15,74 in LH also fails, as it did in Campaigns 9 and 10. The photoresponse stability image of SH at the end of the campaign shows a clear latent image of a source with strong forbidden line emission, most notably at 10.5, 14.3, and 15.6 um ([S IV], [Ne V], and [Ne III], respectively). The photoresponsve stability images of LL continue to show the orders very clearly, much as they have in previous campaigns. Analysts: Lei Hao & Greg Sloan Procedure version: 2.7 Campaign 11, Startup, Shutdown and Mid-campaign anneal YEAR 2004 DOY 219 CE1 used for all data collection AORKEY = 11798528 for startup AORKEY = 11817216 for the mid-campaign anneal sequence AORKEY = 11799296 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 8.4 8.9 15.0 12.2 12.3 SH 8.8 6.7 7.0 15.0 12.7 12.8 LL 14.5 10.9 11.0 15.0 12.8 13.0 LH 17.6 17.2 17.5 15.0 13.0 13.2 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 8.2 8.3 15.0 12.4 12.2 SH 8.8 7.5 7.8 15.0 13.0 12.9 LL 14.5 13.8 12.9 15.0 12.8 13.1 LH 17.6 17.9 17.8 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 8.2 8.9 15.0 12.3 12.2 SH 8.8 6.7 6.9 15.0 12.8 13.0 LL 14.5 12.2 12.0 15.0 12.9 13.0 LH 17.6 17.5 17.7 15.0 13.2 13.1 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, as in previous campaigns. The SH and LL SURN results are also within limits. SL exceeds the SURN limit twice, but only slightly (8.9 DN vs. 8.8 DN). The LH SURN has improved compared to previous campaigns. While it is over the 17.6 DN limit in three cases, the maximum excess is 0.3 DN, or better than 2%. None of the LH SURN resuls are more than 0.4 DN under the limit. 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 0.99 0.92 1.01 1.01 1.00 SH 1.07 0.86 0.96 1.01 0.99 1.00 LL 1.25 0.94 1.11 0.98 0.98 0.99 LH 1.02 0.98 1.00 1.00 1.00 1.00 Comments: The SRSRN continue to be very stable, with only LL varying in the 2% range. The SURN results show more stronger variation, with LL exceeding the 20% limit in the 002/001 comparison. While the SURN values for LH exceed the limit in three of six cases, the variation from one measurement to the next is only 14%, within all limits. SL varies by up to 8%, but this is within the limits. 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 15 0 15 0 LL 3152 3 16 2 246 2 LH 4 1 2 1 1 0 The photoresponse stability of SL is still good with no pixels flagged as yellow or red. SH has several pixels which exceed the yellow limit at the shutdown sequence. The positions of these bright regions make it likely that they are latent images of bright emisssion lines observed just before shutdown. They are centered at 47,88, 113,112, 62,101, and 122,47. The corresponding wavelengths are 15.6, 10.5, 14.3, and 10.5 um, and we identify these with [Ne III], [S IV], [Ne V], and [S IV], respectively. The appearance of [S IV] in two orders strengthens the case considerably. LL still shows the most photoresponse variations, with the orders clearly seen in all comparisons. The LL pixels exceeding the red limit in the 002/001 comparison are: 64,27, 12,61, 76,64; in the 003/002 comparison they are: 16,12 and 64,27; in the 003/001 ratio they are 16,12 and 76,64. Pixel 76,64 has been failing consistently from Campaign 7 on. In LH, 4 pixels exceed the yellow limit and one pixel exceeds the red limit. Pixel 15,74 is flagged red in two cases and yellow in the other. It has failed in the two previous campaigns.