Gain Notes for Revolution 1944


In this revolution there is only a very weak Xe line to validate the
energy determination. For a few Science Windows no validation can be done,
but it is safe to assume that the photon energies in this SCW are as well
determined as its neighbours if both neighbours have sensible Xe line positions.


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 gain/energy corrections (including the IC tables) are based on the
two Fe calibration sources in JEM-X1, for both units.

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 rating: Excellent ( Xe line positions within 2% of ideal, though there
		are a few complete misfits due to the very weak Xe line).

JEM-X2 rating: Excellent (Except for settlng points and misfits)

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 25/04/2018