LFI Acceptance Test Plan for IDIS

This document describes the test plan envisaged by the LFI DPC to accept the IDIS system tools. The intent is to validate that the IDIS software components released to the LFI DPC are compliant with the user requirements. The tests defined in this document are meant to be performed at the LFI DPC site after the successful installation of the IDIS system tools. The IDIS software components are expected to be already tested at the system level. Therefore we simply define here the tests to be performed at the DPC site to fully cover the user requirements while, when applicable, for a subset of the requirements we simply indicate test cases defined in the IDIS system test reports

LFI Acceptance Test Report for IDIS

This document follows the LFI Acceptance Test Plan for IDIS and its purpose is to provide the results of the execution of each test case implemented according to the definition given in the plan. The versions of the IDIS tools covered by this document and the test environment are defined respectively in sections 2.2 and 2.7 of the Plan. In the conclusions of this document (section 3) we analyze the results obtained and summarize the status of the acceptance

Planck/LFI: DPC Processing and Use of Pointing Information

Il presente documento rappresenta la versione definitiva. / The current pdf is the final version.Beam attitude is the combination of beam pointing (where the beam is looking in the sky) and beam orientation (how the beam is oriented in the sky) and it is the combination of pointing and orientation information. Scope of this document is to describe how the pointing information is processed the LFI/DPC pipeline to derive the beam attitude information

The importance of band pass and frequency dependent beam modelling in CMB experiment, lessons learned from Planck/LFI

The high level of accuracy required by recent CMB experiments can be obtained accounting for very tiny effects while calibrating them. Among those effect it must be considered the fact that the cosmological dipole, usually used as primary calibrator, must be convolved with the full-sky beam pattern of the instrument and averaged over its bandpass. This is in particular true for a multi horn instrument as Planck/LFI. In this communication we discuss this problem, common to all the CMB missions, in the light of the experience gained on the Planck/LFI instrument. <P /

In-flight calibration and verification of the Planck-LFI instrument

In this paper we discuss the Planck-LFI in-flight calibration campaign. After a brief overview of the ground test campaigns, we describe in detail the calibration and performance verification (CPV) phase, carried out in space during and just after the cool-down of LFI. We discuss in detail the functionality verification, the tuning of the front-end and warm electronics, the preliminary performance assessment and the thermal susceptibility tests. The logic, sequence, goals and results of the in-flight tests are discussed. All the calibration activities were successfully carried out and the instrument response was comparable to the one observed on ground. For some channels the in-flight tuning activity allowed us to improve significantly the noise performance.Comment: Long technical paper on Planck LFI in flight calibration campaign: 109 pages in this (not final) version, 100 page in the final JINST versio

Planck-LFI CPV: 1 Hz frequency spikes

Planck LFI Commissioning and Performance Verification (CPV)Spurious frequency spikes at the fundamental frequency of 1 Hz are known to be present in the LFI scientific data caused by an anomalous interaction between the DAE housekeeping sequencer and the scientific channels. The effect is a spurious signal that adds to the radiometric output after detection and is characterized by frequency spikes at the fundamental frequency of 1 Hz. These spikes are characterized by a series of tests run during all the test campaign in order to check this effect in different situations. Tests performed on ground at satellite level have shown that the effect of these spikes on the LFI science is expected to be very small; therefore the main objectives of the same tests performed during CPV is to compare results with those obtained during the CSL test campaign

Planck-LFI In-Orbit Calibration and Verification Phase Report: Executive Summary

Planck LFI Commissioning and Performance Verification (CPV)This document summarises the results obtained during the commissioning tests performed on the LFI integrated on the Planck satellite. Tests have been conducted from June the 4th 2009 to June 26th 2009. Details of the performed activities are discussed in specific reports that will be available after the CPV

Planck-LFI commissioning: LFI from OFF to DAE setup

Planck-LFI commissioningSwitch On the LFI and verify the functionalities of the LFI REBA and DAE. The LFI is switched on in two steps: first LFI Comm-1 (LFI goes to Stand-by mode); then LFI Comm-2 (LFI goes to DAE Set-up mode)

Planck-LFI CPV: noise properties verification

Planck LFI Commissioning and Performance Verification (CPV)The assessment of the noise properties of the LFI instrument is the main objective of this test. The test is split into two parts. In the first part, the LFI is run unswitched acquiring data in all four phase switch configurations. Power spectra from unswitched data is compared in order to assess whether there is any configuration that is preferable from the point of 1/f noise slope. In the second part, the LFI is run switched for several hours and the full noise properties are characterised in both switching configurations (A/C or B/D) while the non-switching phase switch is kept in its nominal position

Planck-LFI CPV: Blanking Time Verification

Planck LFI Commissioning and Performance Verification (CPV)This test consists in five steps, of about 15 minutes, with different blanking times: 7.5 µιχρο−s, 0 µιχρο−s, 15 µιχρο−s, 22.5 µιχρο−s, and again 7.5 µιχρο−s. In particular, we want to verify that: no current drops or abrupt variations are observed in FEM drain currents; no frequency spikes are observed besides those already characterised during the SPIKE-02 test; frequency spikes are not affected by the different blanking time values; no pop-corn noise is detected in radiometer voltage outputs