July 2004 anneal report for program 10022

There was an anneal of the CCD on July 9, 2004, 30 days after the
previous anneal of June 10.   A homogeneous set of data was obtained 
from proposal 10022: CCD Hot Pixel Annealing.

For the most part, past trends continue. The number of post anneal 
hot pixels continues to increase. The post-anneal dark now shows 20549 
hot pixels.

1) The *raw* post-anneal dark count rate for this anneal is 0.03012 
cnts/pixel. This compares with 0.02781 cnts/pixel in June and 0.02913 
cnts/pixel in May 2004. The count rate per year is 0.001477 cnts/pixel/year 
for Side-2 electronics.

2) The iterated median count rate (after iterating up to 30 times by 
eliminating pixels +/- 5*sigma) is 0.005796 cnts/pixel which is up from 
the previous month. The count rate per year is 0.000551 cnts/pixel/year. 

3) The creation rates for hot pixels over this period show the same type 
of fluctuations as the preceding months. 

   > 0.1 e/s: 45.2 pixels/day in June
   > 1.0 e/s: 14.7
   > 10  e/s: 3.3

   > 0.1 e/s: 10.7 pixels/day in May
   > 1.0 e/s: -0.5
   > 10  e/s: -0.6

   > 0.1 e/s: 6.3 pixels/day in early April
   > 1.0 e/s: 5.2
   > 10  e/s: 1.6

4) The rate at which new hot pixels annealed out was also within the normal 
range of fluctuations.

   > 0.1 e/s: 54.1% annealed away in June.
   > 1.0 e/s: 60.2%
   > 10  e/s: 51.0%

   > 0.1 e/s: 130.5% annealed away in May
   > 1.0 e/s: -107.7%
   > 10  e/s: 80.0%

   > 0.1 e/s: -42.1% annealed away in April
   > 1.0 e/s: -9.7%
   > 10  e/s: -20.5%

Cumulative plots of total post-anneal hot pixels, and the new pixel
anneals are attached.