Tianlai and Paon4 O. Perdereau LAL, Univ. Paris-Sud, CNRS/IN2P3, - - PowerPoint PPT Presentation

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May 16, 2023 22 likes •165 views

Tianlai and Paon4 O. Perdereau LAL, Univ. Paris-Sud, CNRS/IN2P3, Universit 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

SLIDE 1

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

SLIDE 2

Tianlai

(X. Chen slides @Aspen 02/2018) 21cm 25/6/18 2 / 12

SLIDE 3

Forecasted sensivity

Xu et al arXiv :1410.7794 21cm 25/6/18 3 / 12

SLIDE 4

Tianlai on site

Observations started in fall 2016

21cm 25/6/18 4 / 12

SLIDE 5

Calibration source

21cm 25/6/18 5 / 12

SLIDE 6

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

SLIDE 7

Preliminary sky maps

(data from sept. 2016

21cm 25/6/18 7 / 12

SLIDE 8

Preliminary sky maps

(data from sept. 2016

21cm 25/6/18 7 / 12

SLIDE 9

Preliminary sky maps

(data from sept. 2016 Large effect from the Sun during daytime

21cm 25/6/18 7 / 12

SLIDE 10

Calibration of dish array data

disentangling various componentes of the frequency response

f each channel using transits

Fengquan Wu 21cm 25/6/18 8 / 12

SLIDE 11

Calibration of dish array data(2)

disentangling various componentes of the frequency response

f each channel

Fengquan Wu 21cm 25/6/18 9 / 12

SLIDE 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

SLIDE 13

early maps with PAON4

Jiao Zhang PhD

several improvements in hardware since then ...

21cm 25/6/18 11 / 12

SLIDE 14

Recent activities & prospects on PAON4

improve daq software, electronic a long investigation to understand a perturbation

◮ 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)

Perturbed channel Good channel (data of ~24h)

21cm 25/6/18 12 / 12