Paon4 status O. Perdereau on behalf of the PAON4 team (LAL, - - PowerPoint PPT Presentation

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Paon4 status O. Perdereau on behalf of the PAON4 team (LAL, - - PowerPoint PPT Presentation

Oct 23, 2023 570 likes •861 views

Paon4 status O. Perdereau on behalf of the PAON4 team (LAL, CEA/IRFU, Paris & Nanay Obs.) LAL, Univ. Paris-Sud, CNRS/IN2P3, Universit Paris-Saclay, Orsay, France 11th TianLai meeting Pingtan, Guizhou Sept. 18th, 2018 O. Perdereau

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SLIDE 1

Paon4 status

  • O. Perdereau on behalf of the PAON4 team (LAL, CEA/IRFU,

Paris & Nançay Obs.)

LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France

11th TianLai meeting Pingtan, Guizhou

  • Sept. 18th, 2018
  • O. Perdereau

Paon 4 18/9/18 1 / 19

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SLIDE 2

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 usable) ± 20 degrees from zenith transit observations , ∼ 24h scans , ≥ 2015 test bench for electronics, DAQ and on-line computing analysis

  • O. Perdereau

Paon 4 18/9/18 2 / 19

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SLIDE 3

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 usable) ± 20 degrees from zenith transit observations , ∼ 24h scans , ≥ 2015 test bench for electronics, DAQ and on-line computing analysis

  • O. Perdereau

Paon 4 18/9/18 2 / 19

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SLIDE 4

Digitization and cabling

two independent ADC boards (4 channels/boards) two FPGAs on each (2 channels/board) external trigger (∼ 8 kHz) distributed to ADC boards (and internally to the FPGAs) digitized packs of data analyzed (FFT s) by a two layers servers small cluster (4+2) two channels added recently (gain drift calibration & RFI) on a 3rd ADC board

  • O. Perdereau

Paon 4 18/9/18 3 / 19

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SLIDE 5

recent works

The strange case of the perturbed channel Gain calibration Phase stablity & calibration Recent scans

  • O. Perdereau

Paon 4 18/9/18 4 / 19

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SLIDE 6

T ypical time-frequency maps (autocor.)

“trend” : temporal gain variations (temperature) correction using blind extra channel

  • O. Perdereau

Paon 4 18/9/18 5 / 19

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SLIDE 7

T ypical time-frequency maps (autocor.)

SATELLITES

CygA (+Gal.)

RFIs ?

21 cm

“trend” : temporal gain variations (temperature) correction using blind extra channel

  • O. Perdereau

Paon 4 18/9/18 5 / 19

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SLIDE 8

T ypical time-frequency maps (autocor.)

“trend” : temporal gain variations (temperature) correction using blind extra channel

  • O. Perdereau

Paon 4 18/9/18 5 / 19

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SLIDE 9

The “perturbation”

Time-frequency map (4H)

  • O. Perdereau

Paon 4 18/9/18 6 / 19

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SLIDE 10

The “perturbation”

Signal trends additionnal noise ( ?) rather than extra gain change ?

  • O. Perdereau

Paon 4 18/9/18 6 / 19

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SLIDE 11

The strange case of the perturbed channel(s)

Only one antenna at a time was affected Phenomena observed in 2015, prior to october (stopped after some work on site ?), on antenna 3 Antenna 4 was “preferred” in 2017-8 ∼ 80% probability of occurence Sometimes (∼ 20%) phenomenon switched to another antenna fast rise/fall, relative amplitude 40 to 100 % investigations (long) :

◮ permutations in signal transmission & RO : perturbation from “outside”

(source seen in some FSL ? radar ? phone ?)

◮ improvements in grounding & filtering unsuccessfull ◮ direct investigations not successfull (at first)

  • O. Perdereau

Paon 4 18/9/18 7 / 19

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SLIDE 12

Start and end hours

(some coarse measurements on low-res plots) ⇒ Correlation with sunset (start) and rise (end) at Nançay in 2015 et 2017-8 (within 20 mn)

  • O. Perdereau

Paon 4 18/9/18 8 / 19

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SLIDE 13

And the Guilty is ...

going around the parabollas at sunsets or nights with antennas, scopes,... brought nothing but indirect evidences ... and more carefull direct (unrecorded) observations show it’a little bird spending nights inside the feeds’ envelope installing anti-bird nets cured the problem !

  • O. Perdereau

Paon 4 18/9/18 9 / 19

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SLIDE 14

Gain drift correction

“Thermometric” new channel (LNA + 50Ω end-cap) readout by same electronics than the antennas’ feeds ⇒ template for gain variation with time (temperature) linear fit (one offset per day) ⇒ correction of gain variation better than ∼ ±2%

  • O. Perdereau

Paon 4 18/9/18 10 / 19

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SLIDE 15

Electronic phase relative calibration

Differential phase shifts between signal transmission lines use bright source transits to fit relative phases (and

  • ther params) for relative

phases using point source signal modelling in frequency bins phase low degree polynomial model → used to correct data H and V polar treated independently at the moment

  • O. Perdereau

Paon 4 18/9/18 11 / 19

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SLIDE 16

Electronic phase relative calibration

Differential phase shifts between signal transmission lines use bright source transits to fit relative phases (and

  • ther params) for relative

phases using point source signal modelling in frequency bins phase low degree polynomial model → used to correct data H and V polar treated independently at the moment

  • O. Perdereau

Paon 4 18/9/18 11 / 19

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SLIDE 17

Observations - summer 2018

Thanks to C. Pailler for this data-taking (and more !)

  • O. Perdereau

Paon 4 18/9/18 12 / 19

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SLIDE 18

Observations - summer 2018 : examples

scan at CasA (RA∼ 23.5h) elevation

  • O. Perdereau

Paon 4 18/9/18 13 / 19

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SLIDE 19

Observations - summer 2018 : examples

CasA Standing waves

scan at CasA (RA∼ 23.5h) elevation

  • O. Perdereau

Paon 4 18/9/18 13 / 19

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SLIDE 20

Observations - summer 2018 : examples

scan at CasA (RA∼ 23.5h) elevation

  • O. Perdereau

Paon 4 18/9/18 13 / 19

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SLIDE 21

Observations - summer 2018 : examples

CasA Sun through FSL ?

  • Corr. noise?

scan at CasA (RA∼ 23.5h) elevation

  • O. Perdereau

Paon 4 18/9/18 13 / 19

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SLIDE 22

First comparision with expectations

5 10 10 15 15 20 20 2 2 4 4 6 6 8 8 10 10 12 12 14 14 16 16 18 18 20 20 RA (hours) RA (hours) Signal Level, Kelvin Signal Level, Kelvin PAON4 A04 (elev=11.4) and expected AutoCor @ 1420 MHz PAON4 A04 (elev=11.4) and expected AutoCor @ 1420 MHz PAON4 data (AutoCor) Expected (AutoCor) 22 22 22.5 22.5 23 23 23.5 23.5 24 24

  • 6
  • 6
  • 4
  • 4
  • 2
  • 2

2 4 6 RA (hours) RA (hours) Signal Level, Kelvin Signal Level, Kelvin PAON4 A04 (elev=11.4) and expected 2H3H @ 1390 MHz PAON4 A04 (elev=11.4) and expected 2H3H @ 1390 MHz PAON4 data (X-Cor.real) Expected (X-Cor.real) 22 22 22.5 22.5 23 23 23.5 23.5 24 24

  • 6
  • 6
  • 4
  • 4
  • 2
  • 2

2 4 6 RA (hours) RA (hours) Signal Level, Kelvin Signal Level, Kelvin PAON4 A04 (elev=11.4) and expected 2H3H @ 1390 MHz PAON4 A04 (elev=11.4) and expected 2H3H @ 1390 MHz PAON4 data (X-Cor.imag) Expected (- X-Cor.imag) 17 17 17.5 17.5 18 18 18.5 18.5 19 19 19.5 19.5 20 20

  • 0.1
  • 0.1
  • 0.05
  • 0.05

0.05 0.05 0.1 0.1 RA (hours) RA (hours) Signal Level, Kelvin Signal Level, Kelvin PAON4 A10 (elev=1.4) and expected 2H4H @ 1390 MHz PAON4 A10 (elev=1.4) and expected 2H4H @ 1390 MHz PAON4 data (X-Cor.imag) Expected (- X-Cor.imag)

  • O. Perdereau

Paon 4 18/9/18 14 / 19

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SLIDE 23

Summary (1)

Several improvements in our set-up (e.g. new “systematics”-oriented channels) A long lasting problem solved 2018 summer data looks promising Still to do : RFI filtering and/or frequency selection, Sun contamination, ... Some imperfections e.g. standing waves in cables, correlated noise led to developments of NEBULA/IDROGEN boards (D. Charlet’s talk)

  • O. Perdereau

Paon 4 18/9/18 15 / 19

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SLIDE 24

2

Daniel Charlet Guiyang 09-2018

NEBULA Board

  • MTCA 4.0 standard, Double-width,

full size AMC.

  • FPGA : 5AGTMC7G3F31
  • Stand alone mode (12v)
  • DAC 2 channels 1GSPS.
  • White Rabbit compliant.
  • On board configuration (µC)
  • Very low noise synthesizer PLL

synthesizer cleaner (LM04828)

  • Front panel : WR SFP+

2x SFP+ 10GbEth

  • Backplane connectivity :

Gbe IP bus,PCI 4x Gen3, IPMB, CLK & trigger lane.

10Gb

LMK04828

µC ATMEGA Power CTRL DS1014

IPMI

Data Synch & config

SPI I2C SPI FPGA ctrl/cde & conf SPI

SSRAM 512K Flash x 2 1Mb EPLD MAXV

ADC 081020 2x 1GSPS

Input bandwidth : 2Ghz

Data/config 1Gb

config

10Gb

WhiteRabbit IPMB WR IPBus

PCIE x4

Eth Eth

  • O. Perdereau

Paon 4 18/9/18 16 / 19

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SLIDE 25

3

NEBULA board, PPS test

  • 400 fs after 1000s over 100 m
  • O. Perdereau

Paon 4 18/9/18 17 / 19

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SLIDE 26

4

Daniel Charlet Guiyang 09-2018

IDROGEN board

ARRIA 10 SX 10AX027H4F34

IP bus Ethernet 1G PCIEx 4x Gen3 IPMB ATMEGA128 EPCQ SFP+ Ethernet 40G RTM Ethernet 1G White rabbit Ethernet 1G Serial link 40G spi PPS / trig.Ext MAX10

I2C

Cypress FX2LP

JTAG AS prog

LMK04828 CLK.Ext CLK 28 160 7 10

SPI

QSFP+

I2C I2C USB

IDROGEN board

JTAG

SI5338

I2C

CLK 4 FMC+

USB USB

  • MTCA 4.0 standard, Double-width,

full size AMC.

  • FPGA : 10GX027H4F34
  • Stand alone mode (power 12v)
  • HighPinCount FMC slot.
  • White Rabbit compliant.
  • Front panel connectivity : WR SFP+

QSFP+ 40G, USB

  • Backplane connectivity :

1Gbe IPbus,PCI 4x Gen3, IPMB, CLK & trigger lane.

  • RTM connector : J30.
  • Low cost
  • O. Perdereau

Paon 4 18/9/18 18 / 19

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SLIDE 27

Summary (2)

Stay tuned for more on data analysis (sensitivity, sky maps,...) main improvement : IDROGEN board → will be described by D. Charlet this afternoon will be tested and used soon (early 2019 ?) in PAON4 THANK YOU !

  • O. Perdereau

Paon 4 18/9/18 19 / 19