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"TianLai Project" Dark Energy Observation
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<big>'''The TianLai Project -- A Radio Observation Experiment for Dark Energy'''</big>
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A wide range of cosmological observations have been proposed that make use of the 21 cm emission of neutral hydrogen. These include: Measurement of the expansion history h(z), via the mapping of large scale structure and baryon acoustic oscillations at redshifts from 0 to 1; Detection of the redshift of the Epoch of Reionization, believed to lie someplace in the redshift range 7 to 12; and Measurement of the linear growth of large scale structure in the neutral dark age at redshifts as high as 50. Because 21 cm observations provide three-dimensional information many theorists are intrigued by the huge information content such observations promise to provide. The physics examined by such observations may soon include a test of the “Dark Energy” equation of state, and study of linear growth of dark matter structures via ordinary attractive gravity, as well as information from very early epochs on star formation and radiative transport.
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But, even though the potential for such observation is exciting, the actual observations remain challenging to carry out. First, the telescopes are big. These observations will be made using telescopes of collecting area at least 10,000 m^2, and with hundreds or even thousands of wide-band receiver channels. Second, both Galactic and extragalactic foreground emissions exceed the sought after 21 cm signals by many orders of magnitude. Third, the frequency range of these observations is heavily contaminated by man-made interference. Removal of these foregrounds, and the man made interference, will require understanding and calibration of the telescope response with unprecedented precision.
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The Tianlai project is an experiment aimed at detecting dark energy by measuring the baryon acoustic oscillation (BAO) features in the large scale structure power spectrum, which can be used as a standard ruler. The basic plan is to build a radio telescope array, and use it to make 21cm intensity mapping observations of the neutral hydrogen which traces out the large scale structure of matter distribution.
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Currently, the Tianlai collaboration includes scientists and engineers from China, Canada, France, and USA.
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The word “Tianlai” literally means “heavenly sound”, it was coined by the ancient philosopher Zhuangzi (or Chuang Tzu, 369BCE-286BCE) .
  
  
 
== Getting started ==
 
== Getting started ==
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<font color=red>This wiki is only available for members of TianLai. If you need the member account, please email to our manager(Fengquan Wu):wufq@bao.ac.cn</font>
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* [//www.mediawiki.org/wiki/Manual:Configuration_settings Configuration settings list]
 
* [//www.mediawiki.org/wiki/Manual:Configuration_settings Configuration settings list]
 
* [//www.mediawiki.org/wiki/Manual:FAQ MediaWiki FAQ]
 
* [//www.mediawiki.org/wiki/Manual:FAQ MediaWiki FAQ]
 
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
 
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
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== Telecons and Hacksessions ==
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* [https://indico.fnal.gov/event/17652/ Fermilab Indico Site ('live broadcast' links to Zoom)] for monthly collaboration telecons, monthly Tianlai Analysis Center (TAC) telecons, and (roughly) monthly TAC Hacksessions face-to-face, usually no telecon).
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* [https://uwprod-my.sharepoint.com/:w:/g/personal/pttimbie_wisc_edu/EXy3zYPWB8VLtB5X4BUMWW0BipR5HoB2t2QXsvUvPg_tcg?e=0j17To Agendas and notes from Tianlai Analysis Center hacksessions] Roughly once/month at Fermilab or Wisconsin. (This link is to an editable Microsoft Office document.  Let Peter know if it doesn't work.)
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* [https://indico.lal.in2p3.fr/event/3450/ LAL Indico Site with archived telecon notes through July 2017]
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== Data Logs ==
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* [[Log:_Observation_Data_with_32chn_IA_Correlator]]
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* [[Log:_Observation_Data_with_192chn_IA_Correlator]]
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* [[Log:_Tianlai_Instruments_Maintenance]]
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* [[Log:_Power_Operation_of_Devices_in_Antenna_Area]]
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== Data Commentary ==
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* [[Fermilab Data Overview]]
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* [http://tianlai.bao.ac.cn/wiki/index.php/Data_201605-06 Data_201605-06 (1st data shipment)]
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* [http://tianlai.bao.ac.cn/wiki/index.php/Data_201605-06_(NP_Data) Data_201605-06 (only NP) (1st data shipment)]
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* [http://tianlai.bao.ac.cn/wiki/index.php/Data_2018 2018 Data]
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* [http://tianlai.bao.ac.cn/wiki/index.php/Blorder Baseline list]
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== Analysis and Software ==
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* [[Tianlai Pipeline (Zuo Shifan's python code)]]
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* [[Understanding The Python pypeline]]
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* [[Document_Tlpipe]]
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* [[Marriner Notes]]
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* [[Software packages Installed in tianlai01.fnal.gov]]
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* [http://cmb.physics.wisc.edu/tianlai/Quicklook/ Albert's 'quicklook' waterfall plots of NCP data from May, 2016]
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* [[Fermilab Data Overview]]
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* [[Tianlai Analysis Center]]
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== Dish Antennas and Beam Patterns ==
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* [[Dish Feeds]]
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* [[Dish Antenna Simulations]]
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* [[Dish Antenna Beam Measurements from Astronomical Sources]]
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* [[Drone Beam Measurements]]
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[[File:dish_configure.png|thumb|200px|Tianlai Dish Array]]
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== Cylinder Antennas and Beam Patterns ==
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== Presentations and Papers ==
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* [[Talks]] about Tianlai
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* [[Publications about Tianlai]].  Some editable files are in [[Papers]].
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* [[Posters]] - coming soon
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* [[General Papers]] about 21 cm science
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== Proposals ==
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* [[Observing Proposals]]
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* [[Funding Proposals]] - coming soon
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== References ==
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* [[Papers about Radio Telescope Calibration, Beams, etc.]]

Latest revision as of 10:37, 2 October 2019

The TianLai Project -- A Radio Observation Experiment for Dark Energy


The Tianlai project is an experiment aimed at detecting dark energy by measuring the baryon acoustic oscillation (BAO) features in the large scale structure power spectrum, which can be used as a standard ruler. The basic plan is to build a radio telescope array, and use it to make 21cm intensity mapping observations of the neutral hydrogen which traces out the large scale structure of matter distribution.

Currently, the Tianlai collaboration includes scientists and engineers from China, Canada, France, and USA.

The word “Tianlai” literally means “heavenly sound”, it was coined by the ancient philosopher Zhuangzi (or Chuang Tzu, 369BCE-286BCE) .


Contents

[edit] Getting started

This wiki is only available for members of TianLai. If you need the member account, please email to our manager(Fengquan Wu):wufq@bao.ac.cn

[edit] Telecons and Hacksessions


[edit] Data Logs

[edit] Data Commentary

[edit] Analysis and Software

[edit] Dish Antennas and Beam Patterns

Tianlai Dish Array

[edit] Cylinder Antennas and Beam Patterns

[edit] Presentations and Papers

[edit] Proposals

[edit] References

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