Analysis of startup, shutdown and middle sequences, Campaign 5 Abstract: All SRSRN results are within the limits, but the SL SURN exceeded the 8.8 DN limit in four of the six measurements. SL was the only array which showed significant variation in SURN, but this was within the 20% yellow limit. A change in background in the first half of the campaign made the PU fields in SL and the orders in SH and LL readily visible in the photoresponse ratio images. Over 1,000 pixels in SL and LL exceeded the 5% yellow limit, but only one pixel exceeded the 10% red limit (pixel 108,69 in LL). In LH, pixel 5,122 continues to misbehave. Analysts: Lei Hao & Greg Sloan Procedure version: 2.7 Campaign 5, Startup, Shutdown and Mid-campaign anneal YEAR 2004 DOY 081 CE1 used for all data collection AORKEY = 9276160 for startup AORKEY = 9275648 for the mid-campaign anneal sequence AORKEY = 9275904 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 9.4 9.4 15.0 12.2 12.4 SH 8.8 7.6 7.1 15.0 13.3 12.8 LL 14.5 12.1 13.2 15.0 12.9 12.9 LH 17.6 16.4 17.4 15.0 13.0 13.1 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 8.0 10.2 15.0 12.3 12.3 SH 8.8 7.1 7.1 15.0 12.7 12.8 LL 14.5 12.8 10.9 15.0 12.7 13.0 LH 17.6 17.3 16.9 15.0 13.2 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 9.1 8.4 15.0 12.3 12.2 SH 8.8 7.4 7.0 15.0 12.8 12.8 LL 14.5 10.8 12.7 15.0 13.0 12.9 LH 17.6 17.0 17.0 15.0 13.1 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. SL was significantly over the 8.8 DN limit on multiple occasions: both before and after startup anneal (9.4 DN), after the mid-campaign anneal (10.2 DN), and before the shutdown anneal (9.1 DN). The other modules were well-behaved. 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 0.84 0.89 0.97 0.99 1.00 1.00 SH 1.01 1.05 1.05 0.99 1.00 1.01 LL 0.97 0.99 0.82 0.99 1.00 1.01 LH 0.99 1.00 0.97 1.01 1.00 1.00 Comments: The stability of SRSRN remains good, with variations within 1%. The SL SURN, however, varies a lot. The change from startup to mid-campaign is 16%, near the 20% yellow limit, and the change from there to shutdown is 11%. LL also changed by 18% over the full campaign, although changes between the anneals was much smaller. 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 1544 0 0 0 0 0 SH 5 0 0 0 0 0 LL 1198 1 2 0 16 0 LH 1 0 1 0 2 0 Only one pixel exceeds the red limit after flagging dead and warm pixels, pixel 109,69 on LL in the 002/001 comparison. The 002/001 comparison revealed additional problems related to what looks like a brighter background in the middle of the campaign compared to the startup sequence. The PU fields in SL are clearly visible, and the orders are easily distinguished in SH and LL. Only LH seems unaffected. In the 003/002 comparison, two pixels in LL exceeded the yellow limit (76,6 and 12,61). In LH, pixel 5,122 consistently varied by more than 5%, as it has done since Campaign 2. Pixel 60,127 in LH also exceeded the yellow limit.