5.4 The Owen's Valley Radio 5 Current and future CMB 5.2 The Tenerife experiments

5.3 Saskatoon

This experiment is a ground-based telescope located in Saskatoon, Canada. A cooled HEMT receiver with six channels is used to span the frequency range 26 to 46 GHz. The chopping strategy is quite complex, and can be used to synthesise `window functions' appropriate to a range of angular scales. The beam sizes used range from tex2html_wrap_inline1829 at the lowest frequency to tex2html_wrap_inline1831 at the highest. The analysis of observations of a 24 hour RA strip at declination tex2html_wrap_inline1833 is described in Wollack et al. (1993) [99] and Netterfield et al. (1995) [76], indicating a detection of primordial anisotropy. More recently in Netterfield et al. (1997) [75], exciting results have been presented which show not just a detection, but for the first time for a switched-beam instrument, evidence for the form of the power spectrum itself on the angular scales probed. The final map after 3 years of data from this experiment is shown in Figure  13

  

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Figure 13: Saskatoon 3 year map showing region analysed as compared to the COBE full sky coverage.

and the power spectrum from this map will be used below, in comparison with theoretical predictions. We note here that there is currently an overall scaling uncertainty in the Saskatoon results of tex2html_wrap_inline1835 %, due to calibration uncertainties. Recent analysis of the Saskatoon data (Knox, in prep.) appear to show that the previous calibration is an underestimate of the true level of the Saskatoon data. This would make the Doppler peak even higher and lower the value of tex2html_wrap_inline1567 found below.



5.4 The Owen's Valley Radio 5 Current and future CMB 5.2 The Tenerife experiments

image The Cosmic Microwave Background
Aled W. Jones and Anthony N. Lasenby
http://www.livingreviews.org/lrr-1998-11
© Max-Planck-Gesellschaft. ISSN 1433-8351
Problems/Comments to livrev@aei-potsdam.mpg.de