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http://hdl.handle.net/20.500.12386/34986
Title: | Proposal for Matrix Tuning in CPV: Change in bias tuning approach during the CPV phase after the CSL test campaign experience | Authors: | CUTTAIA, FRANCESCO MENNELLA, ANIELLO |
Issue Date: | 2008 | Number: | PL-LFI-PST-TN -091 | 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. | URI: | http://hdl.handle.net/20.500.12386/34986 | Fulltext: | open |
Appears in Collections: | 4.03 Rapporti di progetto |
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