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JeanChristophe HAMILTON

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Jean-Christophe HAMILTON. Alexandre AMBLARD. PCC-Coll ge de France, Paris ... Jean-Christophe HAMILTON. CMBNet meeting, Oxford 6-7-8 Dec. 2000. What is our ... – PowerPoint PPT presentation

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Title: JeanChristophe HAMILTON


1

Low frequency and Scan-synchronous noise
reduction in the Archeops experiment
CMBNet Meeting Oxford, 6-7-8 Dec. 2000
  • Jean-Christophe HAMILTON
  • Alexandre AMBLARD
  • PCC-Collège de France, Paris

2
What is our signal like ?
3
Low frequency drifts
  • Correlated with temperature measurements in the
    cryostat

4
Simultaneous decorrelation of temperature
fluctuations
5
Fourier Power spectra
fknee reduced from 1-2 Hz to 0.2-0.3 Hz
6
Parasitic signal decorrelation
Red line is just an average over 50 points
  • The signal is seen simultaneously
  • by all bolometers (radiation)
  • It is brighter at higher frequency
  • High frequency channel does not
  • contain any CMB

7
Parasitic signal decorrelation
  • We work on maps

S underlying true sky signal map
8
Reconstructed maps
No model of the dipole was included in the
decorrelation
The dipole appears !!!
9
Orientation of the dipole
Angular shift compared to COBE/DMR (deg.)
10
Conclusion
  • Low frequency drifts reduced using bath
  • temperature drifts
  • Parasitic signal removed using high frequency
  • channel
  • Dipole maps and calibration
  • maps are still striped
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