QUBIC

Minutes:

• Moon analysis (Alexandre):
  - new filtering method to avoid filter ringing
  - have to understand missalignment of order 0 and 1 peaks (maybe projection effect)
  - see TES 95 or 96 to check for missalignment

• Calibration files / synthesized beam model (Jean-Christophe):
  - theoretical positions are good
  - the current calfiles don't make sense
  - the method to make the files is mastered: the good files should be produced in the upcoming days

• Instrument (Steve):
  - problem with cryogenics, purge of cold heads might solve it
  - range of 25 degrees in azimuth with the telescope, could scan the Moon (168 to 193 degrees)
  - azimuth scanning speed is 0.22 degrees / second
  - elevation of the line of sight from 50 to 70
  - we need the scanning strategy: at what time and where to start, what to do after that

• Scanning strategy (Sofia, Ismail):
  - there is a file from Sofia for each month with the right time to observe by taking into account airmass, Sun, Moon
  - we would start observing when the Moon is 15-20 degrees under the minimum elevation of the telescope (so far 50 degrees) until the Moon is 15-20 degrees above the maximum elevation (70 degrees)
  - give Steve a file with scanning strategy for the Moon
  - the telescope hase to be centered at an azimuth of 110 degrees

• Scanning strategy (Dorian):
  - worked on Sofia and Ismail's codes
  - Ismail provided ideas: play with coordinate systems because Sofia's code is in azimuth elevation and Ismail's code is in RA dec
  - work on the strategy for the Moon with Sofia and Ismail
  - create visual representation of scanning strategy

• Atmosphere (Engène):
  - problems with libraries, should be fixed now
  - optimise some parts of the code
  - in time make the atmosphere simulation 3D

• QubicSoft (Tom):
  - lots of changes on the master branch
  - issue with residual maps, might be related with convolutions
  - rewrote the script for fitting the mixing matrix: need a preconditioner to check the new version

• Atmosphere (Tom):
  - fixed the intensity map of the CMB for Planck and the polarisation of the atmosphere to zero: helps a lot, residuals 4 times lower and no stripes anymore (but needed to reduce amplitude of atmosphere fluctuations so that the PCG spends less time on atmosphere only)
  - the trick was to flatten everything and use a mask and a PackOperator in the PCG

• Machine Learning (Leonora):
  - working on propagating errors
  - updated branch to master branch status
  - will then work on preconditioner

• Expected program of Sabrina's stay (until the 27th of June):
  - learn how to operate the mount
  - learn how to read data from the instrument
  - work on the GPS data
  - think about what would be interesting to put in the data base to identify/classify easily data (the data base itself might be made by the Argentina team)