Gain Notes for Revolution 1515

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.

For this revolution, and all revolutions after 1511, the offline analysis is based on
the two Fe calibration sources in JEM-X1 i.e. both units now rely on these two sources
for their basic gain correction, prior to offline manual correction. Therefore
this level of correction is impossible to achieve witht the automatic ISDC system
the uses both Fe and Cd sources.

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 excellent gain
correction with all science windows (taken 1 at a time) having a Xe level 
within 2-3% of the ideal, except for the initial settling points and a
handful of misfitted weak SCWs. 
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 very gain
correction with all science windows having a Xe level 
within about 2% of the ideal, except for the usual settling points at the
beginning of the revolution. 
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 11/03/2015