Analysis of startup, shutdown and middle sequences, Campaign 9

Abstract:  All SRSRN results are within limits.  The SURN results
for both SH and LL are well within the limits.  In SL the SURN 
results exceed the limit twice, and LH is even worse, with only
one case below the noise limit (out of six).  The maximum excess
in LH is 7% over the noise limit.  LH has now been exceeding the
SURN limit on a fairly regular basis since Campaign 7.  The SRSRN 
results are very stable through the campaign, and while the SURN 
results are not as good, they remain within the 20% yellow limit.
SL varied by 17% during the campaign, while SH varied by 15%.  The 
photostability check revealed good behavior in SL and SH, but both 
LL and LH had one problem pixel.  In LL, the orders were readily 
apparent in the photoresponse ratio image.

Analysts:  Lei Hao & Greg Sloan
Procedure version:  2.7
Campaign 9, Startup, Shutdown and Mid-campaign anneal
YEAR 2004 DOY 175
CE1 used for all data collection
AORKEY = 10014976 for startup 
AORKEY = 10014464 for the mid-campaign anneal sequence 
AORKEY = 10014720 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      8.8      9.3    15.0     12.2     12.5
    SH     8.8      6.3      7.3    15.0     12.8     12.9
    LL    14.5     12.2     12.3    15.0     12.6     12.9
    LH    17.6     16.4     17.6    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      7.8      8.5    15.0     12.2     12.3
    SH     8.8      6.5      7.6    15.0     12.8     12.7
    LL    14.5     13.3     12.0    15.0     12.8     12.8
    LH    17.6     18.0     17.6    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      7.6     10.3    15.0     12.2     13.3
    SH     8.8      6.5      7.0    15.0     12.8     12.8
    LL    14.5     12.2     12.2    15.0     12.9     12.7
    LH    17.6     18.8     17.7    15.0     13.1     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.  In two of the
    six cases, the SL SURN is over the 8.8 DN limit (startup
    post-anneal, 9.3 DN, and shutdown post-anneal, 10.3 DN).  One
    of the remaining SL SURN tests is at the limit (startup 
    pre-anneal).  Both SH and LL are well within the limits, but
    the results for LH SURN are poor, as in Campaign 8.  Out of
    six cases, LH exceeds the limit 3 times and meets it twice
    more.  The maximum noise is 18.8 DN (vs. 17.6 DN, a 7% excess) 
    in the pre-anneal shutdown data.

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       0.85     0.90     0.83       0.98     1.00     0.98
     SH       0.89     0.85     0.88       0.99     1.00     0.99
     LL       1.08     1.02     0.99       0.99     1.01     1.00
     LH       1.02     1.07     1.07       1.00     1.00     1.00

    Comments:  SRSRN is behaving well and has variations within 2%.  
    The SL and SH SURN both have large variations, but these are still
    within the 20% yellow limit.  

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      1504      2           79       1          860       1
    LH         3      1            2       1            3       1

    SL and SH both behaving well, with no pixels exceeding yellow or red. 
    LH has one pixel over the red limit throughout the campaign (15,74),
    one pixel consistently over the yellow limit (99,60), and two more
    pixels which fail once (70,102 and 0,65).  None of these pixels has
    been a problem before.  In LL, pixel 76,64 is consistently over the
    limit, and one other pixel (56,31) failed once.  Pixel 76,64 in LL 
    has now failed the photostability test the last three campaigns.
    The large number of pixels which exceed the yellow limit are again 
    accompanied by what looks like changes in background emission, since 
    the orders are easily distinguished.

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-001   pre-anneal    8.84        9.76   8.01   8.70   8.69
    IRS-001   post-anneal   9.25        8.93   9.17   9.40   9.51
    IRS-003   post-anneal  10.30       10.35   9.95  10.33  10.39

    As in Campaigns 6 through 8, this analysis reveals no evidence
    that jailbarring is affecting the SL SURN results, since some
    of the individual channels show higher standard deviations than
    the combined sample.  And again, channel 0 is not the culprit
    either.