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E4SiteTelecon2017-02-14

Here are some notes I took from 'Site Evaluation, Construction and Operation' telecon yesterday. Apologies for the delay.

  • An intro from Ken

The most important things to note is that we are keeping some information on the 'E-CMB' wiki at: http://wiki.e-cmb.org/index.php?n=Main.E4 and that a PDF version of the current version of the proposal is (and will be, unless people disagree) at the bottom of that page.

  • Atmospheric modeling: Refinement of existing microwave atmospheric models, inclusion of polarization effects (Davide Maino)

Davide Maino couldn't make the telecon, but sent the following, which we discussed:

 - we have the old Danese & Partridge model for atmospheric emissions
 - in Milano area there is also the expertise to compute the polarized
   contribution from O2 (Zeeman splitting)
 - we are evaluating the Tenerife (Teide) site for the STRIP experiment.

 Radek and Elia discussed. One point is that Josquin Errard may be interested in this. He is working on complementary analysis.

 MarcoP also notes another code that could be useful to compare sites (and several studies have been already done): ATM.

Juan Pardo, one of the developers, is working with him on CASPER analysis and could ask him, if interested, to join these discussions.

  • Atmospheric testing: Development of instrumentation specifically designed for polarized site testing. Definition of standardized instruments and procedures to compare sites correctly. Porting of Dome-C polarized site-testing activities. (Battistelli, De Petris, ...)

There has been testing with BRAIN path finder at 450 GHz in 2010. They did some mapping at constant elevation. They would use the data from 2010. For the proposal they suggest using this data. Any further activity in Concordia would be have to be submitted to authorization, but they would probably be favorable. There is interest in the Barkats/Vieregg apparatus.

  • We will have a letter from Barkats/Vieregg
  • Cost of infrastructure at Dome-C: experience with the Italian Antarctic Program (Masi, Battistelli, ...)

Silvia agrees that this is necessary. Silvia and Elia volunteer.

MarcoP discussed CASPER, a spectrometer in the range 90-450 GHz, that was operated at Dome C two years ago recording atmospheric emission spectra in several observational strategies (also using left-over LHe from SPIDER...). See http://oberon.roma1.infn.it/casper/ They could check the atmosphere emission fluctuations (or stability...) in the whole spectral band with a sampling of 10s. They also had spectra with a HWP modulation but these are still under validation.

He also pointed out HAMSTRAD that is another instrument, a radiometer at 183 GHz, operating continously at Dome C since 2008. He has had several discussions with Philippe Ricaud (he also was at Dome C during my stay) to check the consistency among our data. The pwv values derived with HAMSTRAD are consistent with the ones inferred with radiosondes, at least when radiosondes data are available (every 12/24 hours), even if a small offset is present. See IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, VOL. 51, NO. 6, JUNE 2013 -- Quality Assessment of the First Measurements of Tropospheric Water Vapor and Temperature by the HAMSTRAD Radiometer Over Concordia Station, Antarctica

  • Requirements for infrastructure in Argentina -- Hamilton

Jean-Christophe: the Argentines will be interested in this effort. The data will be in time for all of that. There is already some data from LLama. The atmospheric mapping instrument would be interesting for Argentina. Jean-Christophe will be in in Argentina in 2 weeks and can write material then.

  • Requirements for working in Chile -- Stompor, Baccigalupi, Jaffe

Most weather information comes from ALMA site.

In order to use the Chile site, who we would work with depends on what we want to do. If the instrument is in the middle of nowhere we'd have to discuss things with the president. PB "sub-leases" from ACT. Apparently ALMA doesn't accept any more telescopes (at least recently).

They have lots of other data for different sized-patches. This goes beyond how much vapor in the air.

Radek and other European SO'ers will gather the information necessary to decide if European telescopes, detectors and/or other infrastructure could be put at the SO site.

  • Requirements for working at the South Pole -- Ganga

Ken will gather the information necessary to decide if/how European telescopes, detectors and/or other infrastructure could be put at the South Pole.

  • Requirements for Tenerife -- Alberto

Jose-Alberto Rubino-Martin could not make the telecon, but sent this, which we discussed:

I would like to mention that the Tenerife site should be included in the list of potential sites for observations, and one of the sites to be characterized with the specific instrumentation to be designed within the project.

I can provide the information on requirements/costs for operations in Tenerife if needed. ``Here in the island we could test two sites. One is the Teide Observatory (2.4 km above the sea level), where we have QUIJOTE (10-40GHz), and which is the location, in the near future, for the LSPE-STRIP (40-90GHz), Groundbird (140-220 GHz) and KISS (80-280GHz) experiments. The other option is to explore the peak of the Teide itself, at 3.7km altitude.

  • Designation of a Workpackage Coordinator.

Nobody still on the telecon seemed to want to coordinate this work package. I understand, but we will need to get someone... I'll try to keep things running for the time being.

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Page last modified on February 15, 2017, at 05:50 PM