Tianlai Analysis Teleconference

US/Central
cyberspace

cyberspace

Santanu Das, Peter Timbie (UW-Madison)

TLpipe

Tim has TLpipe 3 running on Tianlai01

libffi used to be bundled in Python builds before 3.7, but is no longer bundled on Linux distr. Installing libffi-devel before building Python3.7 seems to resolve issues installing modules that require _ctypes and other C-files.

Albert has Fermilab computing support working on Tianlai01 Disk issue

Papers status

Dish paper:  Still waiting for readers' comments.  Peter will distribute as they arrive.  Special telecon on Tuesday July 14 (Bastille Day!) at usual time to discuss. 

IEEE paper: Accepted!.  Juyong is making some final changes and will then post to the arxiv so we can reference it in Dish paper. 

Cylinder paper: 2 'comments' papers will appear in the issue that features this paper.

Standing Wave paper experiment - insert isolator in IF system? Isolator with 50 MHz bandwidth (can't find one with 100 MHz) on order.   Jixia, who is at the telescopes,  installed attenuator instead.   John points out that filter in the circuit could be responsible for long delay.  See attached slides.  

Beam former status - Furen Deng  & Zijie Yu - pulsar detected!!!!  See attached slides.

Xuelei: There's a meeting going on now in Thailand on FRB's called FRB2020: http://frb2020.phys.wvu.edu/

Albert:  K. Smith will talk about CHIME FRBs Friday 4PM GMT+2 (Paris) https://us02web.zoom.us/j/84899327327?pwd=Qmg5cVlHY0N1QTRsVTMwNnRZU1lUZz09

Cross-coupling calculations - David Kwak & Peter - the magnitude of the 'correlated noise' that produces the 'nightly mean' for baseline 2V-10V can be explained by cross-coupling between antennas.  David will try on other baselines.  See attached slides.

Idrogen boards - Olivier & Reza - Daniel Charlet is back in the lab.  Enclosures for the boards have been fabricated.  Installation and testing on PAON-4 expected this fall.

Directivity and effective area - Reza has prepared some notes (attached) that agree with calibrations in the papers.

Mapmaking - Reza - BFMTV mapmaking has been applied to NCP.  See attached slides.

NCP 'fast fringes' - Anh has made a plot of the period of daytime fringes that appear to be associated with the Sun as a function of the E-W baseline length.  See attached slides.

We have calls next week on Tuesday and Thursday.

 

 

 

There are minutes attached to this event. Show them.
    • 08:40 09:00
      Cross-coupling simulations for Tianlai Dish Array 20m
      Speakers: Mr David Kwak (UW-Madison), Peter Timbie (UW-Madison)
    • 09:00 09:20
      Tianlai Dish Array Beamformer Status 20m
      Speakers: Furen Deng (NAOC), Zijie Yu (NAOC)
    • 09:20 09:30
      IDROGEN casings (photos) 10m
      Speakers: Olivier Perdereau (LAL, CNRS/IN2P3), Reza Ansari (Univ. Paris Sud & LAL, CNRS/IN2P3)
    • 09:30 09:40
      Beam, Tsys and calibration (some comments) 10m
    • 09:40 09:50
      NCP map making (BFM & m-mode) 10m