Gain Notes for Revolution 1499

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.

This revolution's IC gain history table is based exclusively on the two Fe calibration
sources in the JEM-X1 instrument, for both instruments.

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 very good gain
correction with all science windows having a Xe level 
within 2-3% of the ideal, except for the first points in the settling period
and a couple of outliers. 
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.

CAO 27/02/2015

JEM-X2: 

The Xe line analysis performed using the IC table shows excellent gain
correction with all science windows having a Xe level well
within 2% of the ideal, except for usual initial settling points. All but
a handful of SCWs are within 1% of the ideal. 
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 05/03/2015