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Measurements of the background of INGRID in k with 
the Cass and Naomi foreoptics and a LN2 ladle

Date: 6 march 2003
Test performed by T. Gregory, S. Rees, P. Jolley
Data analyzed by A. Zurita
=====================================================

in> imheader r*[1]
r579149.fit[1][1024,1024][real]: ladle_cassfore   
r579150.fit[1][1024,1024][real]: ladle_cassfore2  
r579151.fit[1][1024,1024][real]: ladle_cassfore2  
r579152.fit[1][1024,1024][real]: ladle_cassfore2  
r579153.fit[1][1024,1024][real]: ladle_no_fore5   
r579154.fit[1][1024,1024][real]: ladle_cassfore2  
r579155.fit[1][1024,1024][real]: ref_blank4       
r579195.fit[1][1024,1024][real]: ladle_naomifore  
r579196.fit[1][1024,1024][real]: ladle_naomifore2 
r579197.fit[1][1024,1024][real]: ladle_naomifore2 
r579198.fit[1][1024,1024][real]: ladle_naomifore2 
r579199.fit[1][1024,1024][real]: refdark          


in> istat r*[412:612,412:612] (statistics in a section of the post-pre)

#     IMAGE      NPIX    MIDPT       MEAN    STDDEV       MIN       MAX    EXPTIME     TITLE             UTSTART
 r579149.fit     40401    6618.      6688.     687.9    -1907.    16162.   5.00400000  ladle_cassfore    12:03:42.087
 r579150.fit     40401    5780.      5768.     558.4    -2095.    15162.   5.00400000  ladle_cassfore2   12:06:15.152
 r579151.fit     40401    6703.      6722.     715.4    -1982.    18974.   5.00400000  ladle_cassfore2   12:09:22.319
 r579152.fit     40401    6917.      6940.     709.5    -1948.    16944.   5.00400000  ladle_cassfore2   12:12:17.963
 r579153.fit     40401    4645.      4627.     412.5    -2036.    15005.   5.00400000  ladle_no_fore5    12:17:11.161
 r579154.fit     40401    2919.      2914.     266.4    -2426.    13077.   5.00400000  ladle_cassfore2   12:18:14.441
 r579155.fit     40401    8.499      10.81     77.07    -3186.    10547.   5.00400000  ref_blank4        12:20:05.183
 r579195.fit     40401   10415.     10358.     891.2    -1598.    16612.   5.00400000  ladle_naomifore   16:27:31.668
 r579196.fit     40401    8470.      8453.     728.7    -1729.    13422.   5.00400000  ladle_naomifore2  16:28:38.827
 r579197.fit     40401   10149.     10090.     856.8    -1514.    16585.   5.00400000  ladle_naomifore2  16:30:22.522
 r579198.fit     40401   11172.     11136.     946.3    -1409.    18536.   5.00400000  ladle_naomifore2  16:30:58.328
 r579199.fit     40401    16.38     19.49      41.48    -3163.     4480.   5.00400000  refdark           16:36:31.294



Results:  (Ps: clear, F1: ks, F2: clear)
-------

adu/s for the configuration of foreoptics shown. INGRID was always 
looking at a cold LN2 ladle:

a/ No foreoptics + blanks + ks: no signal

b/ No foreoptics + ks         : 930 adu/s

c/ Cass foreoptics (1st meas) : 1300 adu/s

d/ Cass foreoptics (2nd meas) : 583 adu/s  ???  (must be no-foreoptics)

e/ Naomi foreoptics           : 2010 adu/s


There is not measurement of the background without any foreoptics close in time
to the tests done for the Naomi foreoptics. We should repeat this test again.