Gain Notes for Revolution 1439

This is one of the later revolutions in the mission where the calibration
sources have become so weak that for the best energy determination and
IC Gain History table is needed.
 

To get optimal results with this revolution it is necessary to use the IC gain history.
See notes in revolutions prior to revolution 1433 to find out how to do this
if you don't already know.

Latest OSA software (version 10 and higher) automatically cuts out the first
Science windows of data from each revolution to ensure that people do not use data
from the instrument-settling period. This process can be overruled, but only by
experienced users.
	
JEM-X1: 

The Xe line analysis performed using the IC table shows good gain
correction with all science windows (taken 1 at a time) having a Xe level 
within 3-4% of the ideal, except for one outlier. However, with the exception
of 7 points, all other SCWs are within 2% of ideal. This is quite a noisy
revolution with lots of scatter.
As usual however, it is recommended that users avoid the first few science 
windows for energy-sensitive applications (automatically removed by OSA 10.0).


Calibration source number 4 (purple/orange) is no longer
used for calibration purposes since an anode strip directly under the source
has broken and no useable signal comes from this area of the detector any
longer.

JEM-X2: 

The Xe line analysis performed using the IC table shows very good gain
correction with all science windows (taken 1 at a time) having a Xe level 
within 3% of the ideal. All but a handful of SCWs are within 2% of ideal,
despite the Xe line position evolution having a very domed shape that
inversely mirrors the GH shape.
As usual however, it is recommended that users avoid the first few science 
windows for energy-sensitive applications (automatically removed by OSA 10.0).


As with JEM-X1, source 4 is no longer used for energy correction purposes due
to a broken anode strip

CAO 14/8/2014