Proposal for Matrix Tuning in CPV: Change in bias tuning approach during the CPV phase after the CSL test campaign experience
Date Issued
2008
Author(s)
Abstract
In this memo we describe the proposal for a new tuning bias approach to be applied during the CPV
phase. The need of a different approach in bias tuning during CPV compared to what was used during
Instrument Level Tests (ILT) has been clear since long, due to the complexity and criticality of the
baseline scheme that was, on the other hand, optimal for ILT.
This baseline scheme, currently implemented in CPV timeline which is based on the CPV test plan v.
1.1., foresees two consecutive and dependent tuning steps (Vg1 followed by Vg2) to be performed during
the cooldown phase of the 4K cooler. Because each step needs an independent temperature jump, the
major criticality of this approach is in the time needed to complete, analyse and set the optimal Vg1
values before starting the Vg2 tuning step in the middle of the 4K cooldown.
It was therefore decided that this approach would be revised after the CSL test campaign, during which a
different approach named "matrix tuning" was tested. Here we briefly summarise the lessons learned from
CSL and outline a proposal for CPV.
We stress the importance of the tuning phase which is the time in which the noise performances of the
instrument are defined. During CPV this will be a decisive phase in which the scientific performances of
the LFI will be set for the rest of the mission. It is therefore of key importance that the strategy that will
be implemented will guarantee that the optimal point will be recognized and set.
In this document we present a proposal that goes in this direction.
Volume
PL-LFI-PST-TN -091
Rights
open.access
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