X-IFU background calibration plan
Date Issued
2021
Author(s)
Abstract
The particle background can be considered as a calibration source (the galactic cosmic ray flux) for the
X-IFU instrument. The standard X-IFU background spectrum in closed observations is induced by three
different components (protons, alpha particles and electrons), that can be modeled as a continuum
power law spectrum plus some gaussian emission lines due to fluorescence and escape peaks1
. The
three components can have different variations along the solar cycle, and should in principle be
modeled independently. Even when used to fit a single component, the “power law + gaussians” model
is an empirical model resulting from the superimposition of different background spectra induced by
the different particle populations impacting on the detector as a result of the primary particle species.
Background calibration sources:
- Ahepam
o Protons
o Alpha
o Electrons
- WFI
- X-IFU high energy band
- CryoAC
- Filter wheel closed time observations
- Other satellites
The aim of this document is to produce a global model of the background that will allow us to put
together all the information from the different calibration sources to produce a reliable estimate of the
background during an observation.
Volume
TN_INAF_AHEAD_2021_001
Rights
restricted
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