Tianlai and Paon4 O. Perdereau LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France 21cm group - Orsay - June 25th, 2018 21cm 25/6/18 1 / 12
Tianlai (X. Chen slides @Aspen 02/2018) 21cm 25/6/18 2 / 12
Forecasted sensivity Xu et al arXiv :1410.7794 21cm 25/6/18 3 / 12
Tianlai on site Observations started in fall 2016 21cm 25/6/18 4 / 12
Calibration source 21cm 25/6/18 5 / 12
Sky reconstruction (cylinder array) synthetic beam & array design (sensor positions) sky reconstruction using spherical harmonics Jiao Zhang et al arXiv :1606.03830 21cm 25/6/18 6 / 12
Preliminary sky maps (data from sept. 2016 21cm 25/6/18 7 / 12
Preliminary sky maps (data from sept. 2016 21cm 25/6/18 7 / 12
Preliminary sky maps (data from sept. 2016 Large effect from the Sun during daytime 21cm 25/6/18 7 / 12
Calibration of dish array data disentangling various componentes of the frequency response of each channel using transits Fengquan Wu 21cm 25/6/18 8 / 12
Calibration of dish array data(2) disentangling various componentes of the frequency response of each channel Fengquan Wu 21cm 25/6/18 9 / 12
PAON4 Characteristics : 4 antennas ( ∼ 3 deg beams) in Nancay ( ∼ 200 km south of Paris) 2 polar./antenna Frequency band 1250 - 1500 MHz ( ∼ 1275 - 1480 MHz ) ± 20 degrees from zeith transit observations ; ∼ 24h scans since 2015 test bench for electronics, daq and on-line computing analysis 21cm 25/6/18 10 / 12
early maps with PAON4 Jiao Zhang PhD several improvements in hardware since then ... 21cm 25/6/18 11 / 12
Recent activities & prospects on PAON4 Good channel (data of ~24h) improve daq software, electronic a long investigation to understand a perturbation Perturbed channel ◮ looks like an increase of noise ◮ on one antena at a time, ∼ every day ◮ but only between sunsets and sunrises ◮ ... due to a small bird ( !) phase shifts in the electronics/cables test IDROGEN board (D. Charlet, LAL) 21cm 25/6/18 12 / 12
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