Analysis of startup, shutdown and middle sequences, Campaign 15

Abstract:  All SRSRN results are within limits.  As in previous
campaigns, SH and LL are within the SURN limits, but SL and LH
are not.  SL is improving with only two SURN measurements out
of six over the limit, but LH is worse than in Campaign 14, 
failing all six times.  The worst LH performance was 19.4 DN,
right before the shut-down anneal.  The SRSRN results remain 
very stable, as in previous campaigns, and the SURN results are 
more stable than previously, with all modules within the 20% 
yellow limit.   The LL orders are visible as usual in the
photoresponse variation images.  One LL pixel continues to 
exceed the red limit:  16,12.  On LH pixel also continues to 
fail:  15,74.

Analysts:  Lei Hao & Greg Sloan
Procedure version:  2.7
Campaign 14, Startup, Shutdown and Mid-campaign anneal
YEAR 2004 DOY 315
CE1 used for all data collection
AORKEY = 12589568 for startup 
AORKEY = 12589056 for the mid-campaign anneal sequence 
AORKEY = 12589312 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      8.5      9.0    15.0     12.3     12.3
    SH     8.8      7.3      7.2    15.0     12.8     12.9
    LL    14.5     12.4     12.6    15.0     12.9     13.0
    LH    17.6     17.9     17.6    15.0     13.1     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      8.9    15.0     12.2     12.3
    SH     8.8      6.2      7.6    15.0     12.7     12.8
    LL    14.5     11.9     10.5    15.0     13.2     13.0
    LH    17.6     18.8     18.1    15.0     13.2     13.2

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      8.1      8.5    15.0     12.2     12.4
    SH     8.8      6.8      8.0    15.0     12.8     12.9
    LL    14.5     11.5     11.9    15.0     13.1     13.0
    LH    17.6     19.4     17.6    15.0     13.1     13.2

    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.  Both SH and
    LL SURN are within limits, as in the previous campaigns.
    The SL SURN results are better than in previous campaigns, 
    with only two counts slightly over the limit:  pre-anneal at 
    startup (9.0 DN) and pre-anneal in the middle sequence 
    (8.9 DN).  LH is problematic again after showing a slight 
    improvement in the previous campaign.  Now it reaches or 
    exceeds the 17.6 DN limit in every case, with a maximum of 
    19.4 DN just before the shutdown anneal.  
 
Changes in read noise between anneals and from startup to shutdown:

            SUR data                       SRS data
            002-pre/  003-pre/  003-pre/   002-pre/  003-pre/  003-pre/
    Module  001-post  002-post  001-post   001-post  002-post  001-post

     SL       0.91     0.92     0.91       0.99       0.99     0.99
     SH       0.86     0.90     0.95       0.99       1.00     0.99
     LL       0.95     1.10     0.91       1.02       1.01     1.01
     LH       1.06     1.07     1.10       1.00       1.00     0.99

    Comments:  The SRSRN results remain very stable, with only LL 
    reaching a 2% variation.  The SURN results are much improved
    compared to previous campaigns, with no cases reaching the 
    yellow limit.  The worst variation is in SH, 14% between the 
    startup and middle seqeunces.  The other variations are within 
    10%.  

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      27      0              0      0             0      0
     SH       0      0              0      0             0      0
     LL     878      1              5      1             6      1
     LH       2      1              5      1             4      0

    These are the best photoresponse results for the last five
    campaigns.  In the SL photoresponse images, the Peak-Up array
    is visible in the images comparing the startup to the middle
    of the campaign, with 27 pxiels over the yellow limit.  LL, 
    as usual, has the orders clearly visible in the startup-middle
    comparison, with many over the yellow limit.  One LL pixel,
    16,12, is over the limit consistently.  It also failed in
    Campaigns 13 and 14.  LH behaves well, with only a couple of 
    pixels over the yellow limit and one pixel over the red limit:
    15,74. This pixel has failed in most campaigns, except for
    Campaign 14.