Gain Notes for Revolution 1517

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.

The basic offline gain correction is derived from the two Fe calibration sources
in the JEM-X1 instrument for both JEM-X1 and JEM-X2 since the Cd sources are
too weak to be used.

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 SCW at a time) having a Xe level 
within 2-3% of the ideal, except for the very first settling period points. 
As usual, it is recommended that users avoid the first few science 
windows for energy-sensitive applications (automatically removed by OSA 10.0).
	

JEM-X2: 

The Xe line analysis performed using the IC table shows good gain
correction with all science windows (taken      at a time) having a Xe level 
within 2-3% of the ideal, except for the first settling points      . 
As usual however, it is recommended that users avoid the first few science 
windows for energy-sensitive applications (automatically removed by OSA 10.0).


CAO 24/03/2015