Gain Notes for Revolution 1531

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.

All offline calibration for this revolution based on the two Fe calibration
sources in the JEM-X1 unit.

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 (taken 1 at a time) having a Xe level 
within 2% of the ideal, except for the very first settling points, the very
last SCW and one outlier, 5% above 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).


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 21/04/2015


JEM-X2: 

The Xe line analysis performed using the IC table showsvery good gain
correction with all science windows having a Xe level 
within 2-3% of the ideal, except for the usual settling points, and most of the
SCWs fall within 1% of 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).

The JEM-X2 corrections are based on the JEM-X1 Fe calibration sources, since
all the Cd sources are now to weak to use.

CAO 03/06/2015